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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1901 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * Version: 7.5 |
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| 4 | * |
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| 5 | * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. |
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| 6 | * Copyright (C) 2009 VMware, Inc. All Rights Reserved. |
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| 7 | * |
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| 8 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 9 | * copy of this software and associated documentation files (the "Software"), |
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| 10 | * to deal in the Software without restriction, including without limitation |
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| 11 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 12 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 13 | * Software is furnished to do so, subject to the following conditions: |
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| 14 | * |
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| 15 | * The above copyright notice and this permission notice shall be included |
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| 16 | * in all copies or substantial portions of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 21 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 22 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 23 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 24 | */ |
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| 25 | |||
| 26 | |||
| 27 | /** |
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| 28 | * \file swrast/s_span.c |
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| 29 | * \brief Span processing functions used by all rasterization functions. |
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| 30 | * This is where all the per-fragment tests are performed |
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| 31 | * \author Brian Paul |
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| 32 | */ |
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| 33 | |||
| 34 | #include "main/glheader.h" |
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| 35 | #include "main/colormac.h" |
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| 36 | #include "main/macros.h" |
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| 37 | #include "main/imports.h" |
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| 38 | #include "main/image.h" |
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| 39 | |||
| 40 | #include "s_atifragshader.h" |
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| 41 | #include "s_alpha.h" |
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| 42 | #include "s_blend.h" |
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| 43 | #include "s_context.h" |
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| 44 | #include "s_depth.h" |
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| 45 | #include "s_fog.h" |
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| 46 | #include "s_logic.h" |
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| 47 | #include "s_masking.h" |
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| 48 | #include "s_fragprog.h" |
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| 49 | #include "s_span.h" |
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| 50 | #include "s_stencil.h" |
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| 51 | #include "s_texcombine.h" |
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| 52 | |||
| 53 | |||
| 54 | /** |
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| 55 | * Set default fragment attributes for the span using the |
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| 56 | * current raster values. Used prior to glDraw/CopyPixels |
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| 57 | * and glBitmap. |
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| 58 | */ |
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| 59 | void |
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| 60 | _swrast_span_default_attribs(struct gl_context *ctx, SWspan *span) |
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| 61 | { |
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| 62 | GLchan r, g, b, a; |
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| 63 | /* Z*/ |
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| 64 | { |
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| 65 | const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF; |
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| 66 | if (ctx->DrawBuffer->Visual.depthBits <= 16) |
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| 67 | span->z = FloatToFixed(ctx->Current.RasterPos[2] * depthMax + 0.5F); |
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| 68 | else { |
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| 69 | GLfloat tmpf = ctx->Current.RasterPos[2] * depthMax; |
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| 70 | tmpf = MIN2(tmpf, depthMax); |
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| 71 | span->z = (GLint)tmpf; |
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| 72 | } |
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| 73 | span->zStep = 0; |
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| 74 | span->interpMask |= SPAN_Z; |
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| 75 | } |
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| 76 | |||
| 77 | /* W (for perspective correction) */ |
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| 78 | span->attrStart[FRAG_ATTRIB_WPOS][3] = 1.0; |
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| 79 | span->attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0; |
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| 80 | span->attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0; |
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| 81 | |||
| 82 | /* primary color, or color index */ |
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| 83 | UNCLAMPED_FLOAT_TO_CHAN(r, ctx->Current.RasterColor[0]); |
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| 84 | UNCLAMPED_FLOAT_TO_CHAN(g, ctx->Current.RasterColor[1]); |
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| 85 | UNCLAMPED_FLOAT_TO_CHAN(b, ctx->Current.RasterColor[2]); |
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| 86 | UNCLAMPED_FLOAT_TO_CHAN(a, ctx->Current.RasterColor[3]); |
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| 87 | #if CHAN_TYPE == GL_FLOAT |
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| 88 | span->red = r; |
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| 89 | span->green = g; |
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| 90 | span->blue = b; |
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| 91 | span->alpha = a; |
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| 92 | #else |
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| 93 | span->red = IntToFixed(r); |
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| 94 | span->green = IntToFixed(g); |
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| 95 | span->blue = IntToFixed(b); |
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| 96 | span->alpha = IntToFixed(a); |
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| 97 | #endif |
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| 98 | span->redStep = 0; |
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| 99 | span->greenStep = 0; |
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| 100 | span->blueStep = 0; |
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| 101 | span->alphaStep = 0; |
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| 102 | span->interpMask |= SPAN_RGBA; |
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| 103 | |||
| 104 | COPY_4V(span->attrStart[FRAG_ATTRIB_COL0], ctx->Current.RasterColor); |
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| 105 | ASSIGN_4V(span->attrStepX[FRAG_ATTRIB_COL0], 0.0, 0.0, 0.0, 0.0); |
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| 106 | ASSIGN_4V(span->attrStepY[FRAG_ATTRIB_COL0], 0.0, 0.0, 0.0, 0.0); |
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| 107 | |||
| 108 | /* Secondary color */ |
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| 109 | if (ctx->Light.Enabled || ctx->Fog.ColorSumEnabled) |
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| 110 | { |
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| 111 | COPY_4V(span->attrStart[FRAG_ATTRIB_COL1], ctx->Current.RasterSecondaryColor); |
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| 112 | ASSIGN_4V(span->attrStepX[FRAG_ATTRIB_COL1], 0.0, 0.0, 0.0, 0.0); |
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| 113 | ASSIGN_4V(span->attrStepY[FRAG_ATTRIB_COL1], 0.0, 0.0, 0.0, 0.0); |
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| 114 | } |
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| 115 | |||
| 116 | /* fog */ |
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| 117 | { |
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| 118 | const SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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| 119 | GLfloat fogVal; /* a coord or a blend factor */ |
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| 120 | if (swrast->_PreferPixelFog) { |
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| 121 | /* fog blend factors will be computed from fog coordinates per pixel */ |
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| 122 | fogVal = ctx->Current.RasterDistance; |
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| 123 | } |
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| 124 | else { |
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| 125 | /* fog blend factor should be computed from fogcoord now */ |
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| 126 | fogVal = _swrast_z_to_fogfactor(ctx, ctx->Current.RasterDistance); |
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| 127 | } |
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| 128 | span->attrStart[FRAG_ATTRIB_FOGC][0] = fogVal; |
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| 129 | span->attrStepX[FRAG_ATTRIB_FOGC][0] = 0.0; |
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| 130 | span->attrStepY[FRAG_ATTRIB_FOGC][0] = 0.0; |
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| 131 | } |
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| 132 | |||
| 133 | /* texcoords */ |
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| 134 | { |
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| 135 | GLuint i; |
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| 136 | for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) { |
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| 137 | const GLuint attr = FRAG_ATTRIB_TEX0 + i; |
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| 138 | const GLfloat *tc = ctx->Current.RasterTexCoords[i]; |
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| 139 | if (ctx->FragmentProgram._Current || ctx->ATIFragmentShader._Enabled) { |
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| 140 | COPY_4V(span->attrStart[attr], tc); |
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| 141 | } |
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| 142 | else if (tc[3] > 0.0F) { |
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| 143 | /* use (s/q, t/q, r/q, 1) */ |
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| 144 | span->attrStart[attr][0] = tc[0] / tc[3]; |
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| 145 | span->attrStart[attr][1] = tc[1] / tc[3]; |
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| 146 | span->attrStart[attr][2] = tc[2] / tc[3]; |
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| 147 | span->attrStart[attr][3] = 1.0; |
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| 148 | } |
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| 149 | else { |
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| 150 | ASSIGN_4V(span->attrStart[attr], 0.0F, 0.0F, 0.0F, 1.0F); |
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| 151 | } |
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| 152 | ASSIGN_4V(span->attrStepX[attr], 0.0F, 0.0F, 0.0F, 0.0F); |
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| 153 | ASSIGN_4V(span->attrStepY[attr], 0.0F, 0.0F, 0.0F, 0.0F); |
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| 154 | } |
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| 155 | } |
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| 156 | } |
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| 157 | |||
| 158 | |||
| 159 | /** |
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| 160 | * Interpolate the active attributes (and'd with attrMask) to |
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| 161 | * fill in span->array->attribs[]. |
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| 162 | * Perspective correction will be done. The point/line/triangle function |
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| 163 | * should have computed attrStart/Step values for FRAG_ATTRIB_WPOS[3]! |
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| 164 | */ |
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| 165 | static INLINE void |
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| 166 | interpolate_active_attribs(struct gl_context *ctx, SWspan *span, GLbitfield attrMask) |
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| 167 | { |
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| 168 | const SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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| 169 | |||
| 170 | /* |
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| 171 | * Don't overwrite existing array values, such as colors that may have |
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| 172 | * been produced by glDraw/CopyPixels. |
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| 173 | */ |
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| 174 | attrMask &= ~span->arrayAttribs; |
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| 175 | |||
| 176 | ATTRIB_LOOP_BEGIN |
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| 177 | if (attrMask & (1 << attr)) { |
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| 178 | const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3]; |
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| 179 | GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3]; |
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| 180 | const GLfloat dv0dx = span->attrStepX[attr][0]; |
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| 181 | const GLfloat dv1dx = span->attrStepX[attr][1]; |
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| 182 | const GLfloat dv2dx = span->attrStepX[attr][2]; |
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| 183 | const GLfloat dv3dx = span->attrStepX[attr][3]; |
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| 184 | GLfloat v0 = span->attrStart[attr][0] + span->leftClip * dv0dx; |
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| 185 | GLfloat v1 = span->attrStart[attr][1] + span->leftClip * dv1dx; |
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| 186 | GLfloat v2 = span->attrStart[attr][2] + span->leftClip * dv2dx; |
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| 187 | GLfloat v3 = span->attrStart[attr][3] + span->leftClip * dv3dx; |
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| 188 | GLuint k; |
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| 189 | for (k = 0; k < span->end; k++) { |
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| 190 | const GLfloat invW = 1.0f / w; |
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| 191 | span->array->attribs[attr][k][0] = v0 * invW; |
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| 192 | span->array->attribs[attr][k][1] = v1 * invW; |
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| 193 | span->array->attribs[attr][k][2] = v2 * invW; |
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| 194 | span->array->attribs[attr][k][3] = v3 * invW; |
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| 195 | v0 += dv0dx; |
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| 196 | v1 += dv1dx; |
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| 197 | v2 += dv2dx; |
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| 198 | v3 += dv3dx; |
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| 199 | w += dwdx; |
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| 200 | } |
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| 201 | ASSERT((span->arrayAttribs & (1 << attr)) == 0); |
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| 202 | span->arrayAttribs |= (1 << attr); |
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| 203 | } |
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| 204 | ATTRIB_LOOP_END |
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| 205 | } |
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| 206 | |||
| 207 | |||
| 208 | /** |
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| 209 | * Interpolate primary colors to fill in the span->array->rgba8 (or rgb16) |
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| 210 | * color array. |
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| 211 | */ |
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| 212 | static INLINE void |
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| 213 | interpolate_int_colors(struct gl_context *ctx, SWspan *span) |
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| 214 | { |
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| 215 | const GLuint n = span->end; |
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| 216 | GLuint i; |
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| 217 | |||
| 218 | #if CHAN_BITS != 32 |
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| 219 | ASSERT(!(span->arrayMask & SPAN_RGBA)); |
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| 220 | #endif |
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| 221 | |||
| 222 | switch (span->array->ChanType) { |
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| 223 | #if CHAN_BITS != 32 |
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| 224 | case GL_UNSIGNED_BYTE: |
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| 225 | { |
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| 226 | GLubyte (*rgba)[4] = span->array->rgba8; |
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| 227 | if (span->interpMask & SPAN_FLAT) { |
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| 228 | GLubyte color[4]; |
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| 229 | color[RCOMP] = FixedToInt(span->red); |
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| 230 | color[GCOMP] = FixedToInt(span->green); |
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| 231 | color[BCOMP] = FixedToInt(span->blue); |
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| 232 | color[ACOMP] = FixedToInt(span->alpha); |
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| 233 | for (i = 0; i < n; i++) { |
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| 234 | COPY_4UBV(rgba[i], color); |
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| 235 | } |
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| 236 | } |
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| 237 | else { |
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| 238 | GLfixed r = span->red; |
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| 239 | GLfixed g = span->green; |
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| 240 | GLfixed b = span->blue; |
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| 241 | GLfixed a = span->alpha; |
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| 242 | GLint dr = span->redStep; |
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| 243 | GLint dg = span->greenStep; |
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| 244 | GLint db = span->blueStep; |
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| 245 | GLint da = span->alphaStep; |
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| 246 | for (i = 0; i < n; i++) { |
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| 247 | rgba[i][RCOMP] = FixedToChan(r); |
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| 248 | rgba[i][GCOMP] = FixedToChan(g); |
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| 249 | rgba[i][BCOMP] = FixedToChan(b); |
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| 250 | rgba[i][ACOMP] = FixedToChan(a); |
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| 251 | r += dr; |
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| 252 | g += dg; |
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| 253 | b += db; |
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| 254 | a += da; |
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| 255 | } |
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| 256 | } |
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| 257 | } |
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| 258 | break; |
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| 259 | case GL_UNSIGNED_SHORT: |
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| 260 | { |
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| 261 | GLushort (*rgba)[4] = span->array->rgba16; |
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| 262 | if (span->interpMask & SPAN_FLAT) { |
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| 263 | GLushort color[4]; |
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| 264 | color[RCOMP] = FixedToInt(span->red); |
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| 265 | color[GCOMP] = FixedToInt(span->green); |
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| 266 | color[BCOMP] = FixedToInt(span->blue); |
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| 267 | color[ACOMP] = FixedToInt(span->alpha); |
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| 268 | for (i = 0; i < n; i++) { |
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| 269 | COPY_4V(rgba[i], color); |
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| 270 | } |
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| 271 | } |
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| 272 | else { |
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| 273 | GLushort (*rgba)[4] = span->array->rgba16; |
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| 274 | GLfixed r, g, b, a; |
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| 275 | GLint dr, dg, db, da; |
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| 276 | r = span->red; |
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| 277 | g = span->green; |
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| 278 | b = span->blue; |
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| 279 | a = span->alpha; |
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| 280 | dr = span->redStep; |
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| 281 | dg = span->greenStep; |
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| 282 | db = span->blueStep; |
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| 283 | da = span->alphaStep; |
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| 284 | for (i = 0; i < n; i++) { |
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| 285 | rgba[i][RCOMP] = FixedToChan(r); |
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| 286 | rgba[i][GCOMP] = FixedToChan(g); |
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| 287 | rgba[i][BCOMP] = FixedToChan(b); |
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| 288 | rgba[i][ACOMP] = FixedToChan(a); |
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| 289 | r += dr; |
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| 290 | g += dg; |
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| 291 | b += db; |
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| 292 | a += da; |
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| 293 | } |
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| 294 | } |
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| 295 | } |
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| 296 | break; |
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| 297 | #endif |
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| 298 | case GL_FLOAT: |
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| 299 | interpolate_active_attribs(ctx, span, FRAG_BIT_COL0); |
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| 300 | break; |
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| 301 | default: |
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| 302 | _mesa_problem(NULL, "bad datatype in interpolate_int_colors"); |
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| 303 | } |
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| 304 | span->arrayMask |= SPAN_RGBA; |
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| 305 | } |
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| 306 | |||
| 307 | |||
| 308 | /** |
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| 309 | * Populate the FRAG_ATTRIB_COL0 array. |
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| 310 | */ |
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| 311 | static INLINE void |
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| 312 | interpolate_float_colors(SWspan *span) |
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| 313 | { |
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| 314 | GLfloat (*col0)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; |
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| 315 | const GLuint n = span->end; |
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| 316 | GLuint i; |
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| 317 | |||
| 318 | assert(!(span->arrayAttribs & FRAG_BIT_COL0)); |
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| 319 | |||
| 320 | if (span->arrayMask & SPAN_RGBA) { |
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| 321 | /* convert array of int colors */ |
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| 322 | for (i = 0; i < n; i++) { |
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| 323 | col0[i][0] = UBYTE_TO_FLOAT(span->array->rgba8[i][0]); |
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| 324 | col0[i][1] = UBYTE_TO_FLOAT(span->array->rgba8[i][1]); |
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| 325 | col0[i][2] = UBYTE_TO_FLOAT(span->array->rgba8[i][2]); |
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| 326 | col0[i][3] = UBYTE_TO_FLOAT(span->array->rgba8[i][3]); |
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| 327 | } |
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| 328 | } |
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| 329 | else { |
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| 330 | /* interpolate red/green/blue/alpha to get float colors */ |
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| 331 | ASSERT(span->interpMask & SPAN_RGBA); |
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| 332 | if (span->interpMask & SPAN_FLAT) { |
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| 333 | GLfloat r = FixedToFloat(span->red); |
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| 334 | GLfloat g = FixedToFloat(span->green); |
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| 335 | GLfloat b = FixedToFloat(span->blue); |
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| 336 | GLfloat a = FixedToFloat(span->alpha); |
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| 337 | for (i = 0; i < n; i++) { |
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| 338 | ASSIGN_4V(col0[i], r, g, b, a); |
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| 339 | } |
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| 340 | } |
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| 341 | else { |
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| 342 | GLfloat r = FixedToFloat(span->red); |
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| 343 | GLfloat g = FixedToFloat(span->green); |
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| 344 | GLfloat b = FixedToFloat(span->blue); |
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| 345 | GLfloat a = FixedToFloat(span->alpha); |
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| 346 | GLfloat dr = FixedToFloat(span->redStep); |
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| 347 | GLfloat dg = FixedToFloat(span->greenStep); |
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| 348 | GLfloat db = FixedToFloat(span->blueStep); |
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| 349 | GLfloat da = FixedToFloat(span->alphaStep); |
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| 350 | for (i = 0; i < n; i++) { |
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| 351 | col0[i][0] = r; |
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| 352 | col0[i][1] = g; |
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| 353 | col0[i][2] = b; |
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| 354 | col0[i][3] = a; |
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| 355 | r += dr; |
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| 356 | g += dg; |
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| 357 | b += db; |
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| 358 | a += da; |
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| 359 | } |
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| 360 | } |
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| 361 | } |
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| 362 | |||
| 363 | span->arrayAttribs |= FRAG_BIT_COL0; |
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| 364 | span->array->ChanType = GL_FLOAT; |
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| 365 | } |
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| 366 | |||
| 367 | |||
| 368 | |||
| 369 | /** |
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| 370 | * Fill in the span.zArray array from the span->z, zStep values. |
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| 371 | */ |
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| 372 | void |
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| 373 | _swrast_span_interpolate_z( const struct gl_context *ctx, SWspan *span ) |
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| 374 | { |
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| 375 | const GLuint n = span->end; |
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| 376 | GLuint i; |
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| 377 | |||
| 378 | ASSERT(!(span->arrayMask & SPAN_Z)); |
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| 379 | |||
| 380 | if (ctx->DrawBuffer->Visual.depthBits <= 16) { |
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| 381 | GLfixed zval = span->z; |
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| 382 | GLuint *z = span->array->z; |
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| 383 | for (i = 0; i < n; i++) { |
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| 384 | z[i] = FixedToInt(zval); |
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| 385 | zval += span->zStep; |
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| 386 | } |
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| 387 | } |
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| 388 | else { |
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| 389 | /* Deep Z buffer, no fixed->int shift */ |
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| 390 | GLuint zval = span->z; |
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| 391 | GLuint *z = span->array->z; |
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| 392 | for (i = 0; i < n; i++) { |
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| 393 | z[i] = zval; |
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| 394 | zval += span->zStep; |
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| 395 | } |
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| 396 | } |
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| 397 | span->interpMask &= ~SPAN_Z; |
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| 398 | span->arrayMask |= SPAN_Z; |
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| 399 | } |
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| 400 | |||
| 401 | |||
| 402 | /** |
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| 403 | * Compute mipmap LOD from partial derivatives. |
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| 404 | * This the ideal solution, as given in the OpenGL spec. |
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| 405 | */ |
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| 406 | GLfloat |
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| 407 | _swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, |
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| 408 | GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, |
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| 409 | GLfloat s, GLfloat t, GLfloat q, GLfloat invQ) |
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| 410 | { |
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| 411 | GLfloat dudx = texW * ((s + dsdx) / (q + dqdx) - s * invQ); |
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| 412 | GLfloat dvdx = texH * ((t + dtdx) / (q + dqdx) - t * invQ); |
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| 413 | GLfloat dudy = texW * ((s + dsdy) / (q + dqdy) - s * invQ); |
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| 414 | GLfloat dvdy = texH * ((t + dtdy) / (q + dqdy) - t * invQ); |
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| 415 | GLfloat x = SQRTF(dudx * dudx + dvdx * dvdx); |
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| 416 | GLfloat y = SQRTF(dudy * dudy + dvdy * dvdy); |
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| 417 | GLfloat rho = MAX2(x, y); |
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| 418 | GLfloat lambda = LOG2(rho); |
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| 419 | return lambda; |
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| 420 | } |
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| 421 | |||
| 422 | |||
| 423 | /** |
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| 424 | * Compute mipmap LOD from partial derivatives. |
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| 425 | * This is a faster approximation than above function. |
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| 426 | */ |
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| 427 | #if 0 |
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| 428 | GLfloat |
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| 429 | _swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, |
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| 430 | GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, |
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| 431 | GLfloat s, GLfloat t, GLfloat q, GLfloat invQ) |
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| 432 | { |
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| 433 | GLfloat dsdx2 = (s + dsdx) / (q + dqdx) - s * invQ; |
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| 434 | GLfloat dtdx2 = (t + dtdx) / (q + dqdx) - t * invQ; |
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| 435 | GLfloat dsdy2 = (s + dsdy) / (q + dqdy) - s * invQ; |
||
| 436 | GLfloat dtdy2 = (t + dtdy) / (q + dqdy) - t * invQ; |
||
| 437 | GLfloat maxU, maxV, rho, lambda; |
||
| 438 | dsdx2 = FABSF(dsdx2); |
||
| 439 | dsdy2 = FABSF(dsdy2); |
||
| 440 | dtdx2 = FABSF(dtdx2); |
||
| 441 | dtdy2 = FABSF(dtdy2); |
||
| 442 | maxU = MAX2(dsdx2, dsdy2) * texW; |
||
| 443 | maxV = MAX2(dtdx2, dtdy2) * texH; |
||
| 444 | rho = MAX2(maxU, maxV); |
||
| 445 | lambda = LOG2(rho); |
||
| 446 | return lambda; |
||
| 447 | } |
||
| 448 | #endif |
||
| 449 | |||
| 450 | |||
| 451 | /** |
||
| 452 | * Fill in the span.array->attrib[FRAG_ATTRIB_TEXn] arrays from the |
||
| 453 | * using the attrStart/Step values. |
||
| 454 | * |
||
| 455 | * This function only used during fixed-function fragment processing. |
||
| 456 | * |
||
| 457 | * Note: in the places where we divide by Q (or mult by invQ) we're |
||
| 458 | * really doing two things: perspective correction and texcoord |
||
| 459 | * projection. Remember, for texcoord (s,t,r,q) we need to index |
||
| 460 | * texels with (s/q, t/q, r/q). |
||
| 461 | */ |
||
| 462 | static void |
||
| 463 | interpolate_texcoords(struct gl_context *ctx, SWspan *span) |
||
| 464 | { |
||
| 465 | const GLuint maxUnit |
||
| 466 | = (ctx->Texture._EnabledCoordUnits > 1) ? ctx->Const.MaxTextureUnits : 1; |
||
| 467 | GLuint u; |
||
| 468 | |||
| 469 | /* XXX CoordUnits vs. ImageUnits */ |
||
| 470 | for (u = 0; u < maxUnit; u++) { |
||
| 471 | if (ctx->Texture._EnabledCoordUnits & (1 << u)) { |
||
| 472 | const GLuint attr = FRAG_ATTRIB_TEX0 + u; |
||
| 473 | const struct gl_texture_object *obj = ctx->Texture.Unit[u]._Current; |
||
| 474 | GLfloat texW, texH; |
||
| 475 | GLboolean needLambda; |
||
| 476 | GLfloat (*texcoord)[4] = span->array->attribs[attr]; |
||
| 477 | GLfloat *lambda = span->array->lambda[u]; |
||
| 478 | const GLfloat dsdx = span->attrStepX[attr][0]; |
||
| 479 | const GLfloat dsdy = span->attrStepY[attr][0]; |
||
| 480 | const GLfloat dtdx = span->attrStepX[attr][1]; |
||
| 481 | const GLfloat dtdy = span->attrStepY[attr][1]; |
||
| 482 | const GLfloat drdx = span->attrStepX[attr][2]; |
||
| 483 | const GLfloat dqdx = span->attrStepX[attr][3]; |
||
| 484 | const GLfloat dqdy = span->attrStepY[attr][3]; |
||
| 485 | GLfloat s = span->attrStart[attr][0] + span->leftClip * dsdx; |
||
| 486 | GLfloat t = span->attrStart[attr][1] + span->leftClip * dtdx; |
||
| 487 | GLfloat r = span->attrStart[attr][2] + span->leftClip * drdx; |
||
| 488 | GLfloat q = span->attrStart[attr][3] + span->leftClip * dqdx; |
||
| 489 | |||
| 490 | if (obj) { |
||
| 491 | const struct gl_texture_image *img = obj->Image[0][obj->BaseLevel]; |
||
| 492 | needLambda = (obj->MinFilter != obj->MagFilter) |
||
| 493 | || ctx->FragmentProgram._Current; |
||
| 494 | texW = img->WidthScale; |
||
| 495 | texH = img->HeightScale; |
||
| 496 | } |
||
| 497 | else { |
||
| 498 | /* using a fragment program */ |
||
| 499 | texW = 1.0; |
||
| 500 | texH = 1.0; |
||
| 501 | needLambda = GL_FALSE; |
||
| 502 | } |
||
| 503 | |||
| 504 | if (needLambda) { |
||
| 505 | GLuint i; |
||
| 506 | if (ctx->FragmentProgram._Current |
||
| 507 | || ctx->ATIFragmentShader._Enabled) { |
||
| 508 | /* do perspective correction but don't divide s, t, r by q */ |
||
| 509 | const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3]; |
||
| 510 | GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3] + span->leftClip * dwdx; |
||
| 511 | for (i = 0; i < span->end; i++) { |
||
| 512 | const GLfloat invW = 1.0F / w; |
||
| 513 | texcoord[i][0] = s * invW; |
||
| 514 | texcoord[i][1] = t * invW; |
||
| 515 | texcoord[i][2] = r * invW; |
||
| 516 | texcoord[i][3] = q * invW; |
||
| 517 | lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, |
||
| 518 | dqdx, dqdy, texW, texH, |
||
| 519 | s, t, q, invW); |
||
| 520 | s += dsdx; |
||
| 521 | t += dtdx; |
||
| 522 | r += drdx; |
||
| 523 | q += dqdx; |
||
| 524 | w += dwdx; |
||
| 525 | } |
||
| 526 | } |
||
| 527 | else { |
||
| 528 | for (i = 0; i < span->end; i++) { |
||
| 529 | const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
||
| 530 | texcoord[i][0] = s * invQ; |
||
| 531 | texcoord[i][1] = t * invQ; |
||
| 532 | texcoord[i][2] = r * invQ; |
||
| 533 | texcoord[i][3] = q; |
||
| 534 | lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, |
||
| 535 | dqdx, dqdy, texW, texH, |
||
| 536 | s, t, q, invQ); |
||
| 537 | s += dsdx; |
||
| 538 | t += dtdx; |
||
| 539 | r += drdx; |
||
| 540 | q += dqdx; |
||
| 541 | } |
||
| 542 | } |
||
| 543 | span->arrayMask |= SPAN_LAMBDA; |
||
| 544 | } |
||
| 545 | else { |
||
| 546 | GLuint i; |
||
| 547 | if (ctx->FragmentProgram._Current || |
||
| 548 | ctx->ATIFragmentShader._Enabled) { |
||
| 549 | /* do perspective correction but don't divide s, t, r by q */ |
||
| 550 | const GLfloat dwdx = span->attrStepX[FRAG_ATTRIB_WPOS][3]; |
||
| 551 | GLfloat w = span->attrStart[FRAG_ATTRIB_WPOS][3] + span->leftClip * dwdx; |
||
| 552 | for (i = 0; i < span->end; i++) { |
||
| 553 | const GLfloat invW = 1.0F / w; |
||
| 554 | texcoord[i][0] = s * invW; |
||
| 555 | texcoord[i][1] = t * invW; |
||
| 556 | texcoord[i][2] = r * invW; |
||
| 557 | texcoord[i][3] = q * invW; |
||
| 558 | lambda[i] = 0.0; |
||
| 559 | s += dsdx; |
||
| 560 | t += dtdx; |
||
| 561 | r += drdx; |
||
| 562 | q += dqdx; |
||
| 563 | w += dwdx; |
||
| 564 | } |
||
| 565 | } |
||
| 566 | else if (dqdx == 0.0F) { |
||
| 567 | /* Ortho projection or polygon's parallel to window X axis */ |
||
| 568 | const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
||
| 569 | for (i = 0; i < span->end; i++) { |
||
| 570 | texcoord[i][0] = s * invQ; |
||
| 571 | texcoord[i][1] = t * invQ; |
||
| 572 | texcoord[i][2] = r * invQ; |
||
| 573 | texcoord[i][3] = q; |
||
| 574 | lambda[i] = 0.0; |
||
| 575 | s += dsdx; |
||
| 576 | t += dtdx; |
||
| 577 | r += drdx; |
||
| 578 | } |
||
| 579 | } |
||
| 580 | else { |
||
| 581 | for (i = 0; i < span->end; i++) { |
||
| 582 | const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
||
| 583 | texcoord[i][0] = s * invQ; |
||
| 584 | texcoord[i][1] = t * invQ; |
||
| 585 | texcoord[i][2] = r * invQ; |
||
| 586 | texcoord[i][3] = q; |
||
| 587 | lambda[i] = 0.0; |
||
| 588 | s += dsdx; |
||
| 589 | t += dtdx; |
||
| 590 | r += drdx; |
||
| 591 | q += dqdx; |
||
| 592 | } |
||
| 593 | } |
||
| 594 | } /* lambda */ |
||
| 595 | } /* if */ |
||
| 596 | } /* for */ |
||
| 597 | } |
||
| 598 | |||
| 599 | |||
| 600 | /** |
||
| 601 | * Fill in the arrays->attribs[FRAG_ATTRIB_WPOS] array. |
||
| 602 | */ |
||
| 603 | static INLINE void |
||
| 604 | interpolate_wpos(struct gl_context *ctx, SWspan *span) |
||
| 605 | { |
||
| 606 | GLfloat (*wpos)[4] = span->array->attribs[FRAG_ATTRIB_WPOS]; |
||
| 607 | GLuint i; |
||
| 608 | const GLfloat zScale = 1.0F / ctx->DrawBuffer->_DepthMaxF; |
||
| 609 | GLfloat w, dw; |
||
| 610 | |||
| 611 | if (span->arrayMask & SPAN_XY) { |
||
| 612 | for (i = 0; i < span->end; i++) { |
||
| 613 | wpos[i][0] = (GLfloat) span->array->x[i]; |
||
| 614 | wpos[i][1] = (GLfloat) span->array->y[i]; |
||
| 615 | } |
||
| 616 | } |
||
| 617 | else { |
||
| 618 | for (i = 0; i < span->end; i++) { |
||
| 619 | wpos[i][0] = (GLfloat) span->x + i; |
||
| 620 | wpos[i][1] = (GLfloat) span->y; |
||
| 621 | } |
||
| 622 | } |
||
| 623 | |||
| 624 | dw = span->attrStepX[FRAG_ATTRIB_WPOS][3]; |
||
| 625 | w = span->attrStart[FRAG_ATTRIB_WPOS][3] + span->leftClip * dw; |
||
| 626 | for (i = 0; i < span->end; i++) { |
||
| 627 | wpos[i][2] = (GLfloat) span->array->z[i] * zScale; |
||
| 628 | wpos[i][3] = w; |
||
| 629 | w += dw; |
||
| 630 | } |
||
| 631 | } |
||
| 632 | |||
| 633 | |||
| 634 | /** |
||
| 635 | * Apply the current polygon stipple pattern to a span of pixels. |
||
| 636 | */ |
||
| 637 | static INLINE void |
||
| 638 | stipple_polygon_span(struct gl_context *ctx, SWspan *span) |
||
| 639 | { |
||
| 640 | GLubyte *mask = span->array->mask; |
||
| 641 | |||
| 642 | ASSERT(ctx->Polygon.StippleFlag); |
||
| 643 | |||
| 644 | if (span->arrayMask & SPAN_XY) { |
||
| 645 | /* arrays of x/y pixel coords */ |
||
| 646 | GLuint i; |
||
| 647 | for (i = 0; i < span->end; i++) { |
||
| 648 | const GLint col = span->array->x[i] % 32; |
||
| 649 | const GLint row = span->array->y[i] % 32; |
||
| 650 | const GLuint stipple = ctx->PolygonStipple[row]; |
||
| 651 | if (((1 << col) & stipple) == 0) { |
||
| 652 | mask[i] = 0; |
||
| 653 | } |
||
| 654 | } |
||
| 655 | } |
||
| 656 | else { |
||
| 657 | /* horizontal span of pixels */ |
||
| 658 | const GLuint highBit = 1 << 31; |
||
| 659 | const GLuint stipple = ctx->PolygonStipple[span->y % 32]; |
||
| 660 | GLuint i, m = highBit >> (GLuint) (span->x % 32); |
||
| 661 | for (i = 0; i < span->end; i++) { |
||
| 662 | if ((m & stipple) == 0) { |
||
| 663 | mask[i] = 0; |
||
| 664 | } |
||
| 665 | m = m >> 1; |
||
| 666 | if (m == 0) { |
||
| 667 | m = highBit; |
||
| 668 | } |
||
| 669 | } |
||
| 670 | } |
||
| 671 | span->writeAll = GL_FALSE; |
||
| 672 | } |
||
| 673 | |||
| 674 | |||
| 675 | /** |
||
| 676 | * Clip a pixel span to the current buffer/window boundaries: |
||
| 677 | * DrawBuffer->_Xmin, _Xmax, _Ymin, _Ymax. This will accomplish |
||
| 678 | * window clipping and scissoring. |
||
| 679 | * Return: GL_TRUE some pixels still visible |
||
| 680 | * GL_FALSE nothing visible |
||
| 681 | */ |
||
| 682 | static INLINE GLuint |
||
| 683 | clip_span( struct gl_context *ctx, SWspan *span ) |
||
| 684 | { |
||
| 685 | const GLint xmin = ctx->DrawBuffer->_Xmin; |
||
| 686 | const GLint xmax = ctx->DrawBuffer->_Xmax; |
||
| 687 | const GLint ymin = ctx->DrawBuffer->_Ymin; |
||
| 688 | const GLint ymax = ctx->DrawBuffer->_Ymax; |
||
| 689 | |||
| 690 | span->leftClip = 0; |
||
| 691 | |||
| 692 | if (span->arrayMask & SPAN_XY) { |
||
| 693 | /* arrays of x/y pixel coords */ |
||
| 694 | const GLint *x = span->array->x; |
||
| 695 | const GLint *y = span->array->y; |
||
| 696 | const GLint n = span->end; |
||
| 697 | GLubyte *mask = span->array->mask; |
||
| 698 | GLint i; |
||
| 699 | if (span->arrayMask & SPAN_MASK) { |
||
| 700 | /* note: using & intead of && to reduce branches */ |
||
| 701 | for (i = 0; i < n; i++) { |
||
| 702 | mask[i] &= (x[i] >= xmin) & (x[i] < xmax) |
||
| 703 | & (y[i] >= ymin) & (y[i] < ymax); |
||
| 704 | } |
||
| 705 | } |
||
| 706 | else { |
||
| 707 | /* note: using & intead of && to reduce branches */ |
||
| 708 | for (i = 0; i < n; i++) { |
||
| 709 | mask[i] = (x[i] >= xmin) & (x[i] < xmax) |
||
| 710 | & (y[i] >= ymin) & (y[i] < ymax); |
||
| 711 | } |
||
| 712 | } |
||
| 713 | return GL_TRUE; /* some pixels visible */ |
||
| 714 | } |
||
| 715 | else { |
||
| 716 | /* horizontal span of pixels */ |
||
| 717 | const GLint x = span->x; |
||
| 718 | const GLint y = span->y; |
||
| 719 | GLint n = span->end; |
||
| 720 | |||
| 721 | /* Trivial rejection tests */ |
||
| 722 | if (y < ymin || y >= ymax || x + n <= xmin || x >= xmax) { |
||
| 723 | span->end = 0; |
||
| 724 | return GL_FALSE; /* all pixels clipped */ |
||
| 725 | } |
||
| 726 | |||
| 727 | /* Clip to right */ |
||
| 728 | if (x + n > xmax) { |
||
| 729 | ASSERT(x < xmax); |
||
| 730 | n = span->end = xmax - x; |
||
| 731 | } |
||
| 732 | |||
| 733 | /* Clip to the left */ |
||
| 734 | if (x < xmin) { |
||
| 735 | const GLint leftClip = xmin - x; |
||
| 736 | GLuint i; |
||
| 737 | |||
| 738 | ASSERT(leftClip > 0); |
||
| 739 | ASSERT(x + n > xmin); |
||
| 740 | |||
| 741 | /* Clip 'leftClip' pixels from the left side. |
||
| 742 | * The span->leftClip field will be applied when we interpolate |
||
| 743 | * fragment attributes. |
||
| 744 | * For arrays of values, shift them left. |
||
| 745 | */ |
||
| 746 | for (i = 0; i < FRAG_ATTRIB_MAX; i++) { |
||
| 747 | if (span->interpMask & (1 << i)) { |
||
| 748 | GLuint j; |
||
| 749 | for (j = 0; j < 4; j++) { |
||
| 750 | span->attrStart[i][j] += leftClip * span->attrStepX[i][j]; |
||
| 751 | } |
||
| 752 | } |
||
| 753 | } |
||
| 754 | |||
| 755 | span->red += leftClip * span->redStep; |
||
| 756 | span->green += leftClip * span->greenStep; |
||
| 757 | span->blue += leftClip * span->blueStep; |
||
| 758 | span->alpha += leftClip * span->alphaStep; |
||
| 759 | span->index += leftClip * span->indexStep; |
||
| 760 | span->z += leftClip * span->zStep; |
||
| 761 | span->intTex[0] += leftClip * span->intTexStep[0]; |
||
| 762 | span->intTex[1] += leftClip * span->intTexStep[1]; |
||
| 763 | |||
| 764 | #define SHIFT_ARRAY(ARRAY, SHIFT, LEN) \ |
||
| 765 | memcpy(ARRAY, ARRAY + (SHIFT), (LEN) * sizeof(ARRAY[0])) |
||
| 766 | |||
| 767 | for (i = 0; i < FRAG_ATTRIB_MAX; i++) { |
||
| 768 | if (span->arrayAttribs & (1 << i)) { |
||
| 769 | /* shift array elements left by 'leftClip' */ |
||
| 770 | SHIFT_ARRAY(span->array->attribs[i], leftClip, n - leftClip); |
||
| 771 | } |
||
| 772 | } |
||
| 773 | |||
| 774 | SHIFT_ARRAY(span->array->mask, leftClip, n - leftClip); |
||
| 775 | SHIFT_ARRAY(span->array->rgba8, leftClip, n - leftClip); |
||
| 776 | SHIFT_ARRAY(span->array->rgba16, leftClip, n - leftClip); |
||
| 777 | SHIFT_ARRAY(span->array->x, leftClip, n - leftClip); |
||
| 778 | SHIFT_ARRAY(span->array->y, leftClip, n - leftClip); |
||
| 779 | SHIFT_ARRAY(span->array->z, leftClip, n - leftClip); |
||
| 780 | SHIFT_ARRAY(span->array->index, leftClip, n - leftClip); |
||
| 781 | for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) { |
||
| 782 | SHIFT_ARRAY(span->array->lambda[i], leftClip, n - leftClip); |
||
| 783 | } |
||
| 784 | SHIFT_ARRAY(span->array->coverage, leftClip, n - leftClip); |
||
| 785 | |||
| 786 | #undef SHIFT_ARRAY |
||
| 787 | |||
| 788 | span->leftClip = leftClip; |
||
| 789 | span->x = xmin; |
||
| 790 | span->end -= leftClip; |
||
| 791 | span->writeAll = GL_FALSE; |
||
| 792 | } |
||
| 793 | |||
| 794 | ASSERT(span->x >= xmin); |
||
| 795 | ASSERT(span->x + span->end <= xmax); |
||
| 796 | ASSERT(span->y >= ymin); |
||
| 797 | ASSERT(span->y < ymax); |
||
| 798 | |||
| 799 | return GL_TRUE; /* some pixels visible */ |
||
| 800 | } |
||
| 801 | } |
||
| 802 | |||
| 803 | |||
| 804 | /** |
||
| 805 | * Add specular colors to primary colors. |
||
| 806 | * Only called during fixed-function operation. |
||
| 807 | * Result is float color array (FRAG_ATTRIB_COL0). |
||
| 808 | */ |
||
| 809 | static INLINE void |
||
| 810 | add_specular(struct gl_context *ctx, SWspan *span) |
||
| 811 | { |
||
| 812 | const SWcontext *swrast = SWRAST_CONTEXT(ctx); |
||
| 813 | const GLubyte *mask = span->array->mask; |
||
| 814 | GLfloat (*col0)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; |
||
| 815 | GLfloat (*col1)[4] = span->array->attribs[FRAG_ATTRIB_COL1]; |
||
| 816 | GLuint i; |
||
| 817 | |||
| 818 | ASSERT(!ctx->FragmentProgram._Current); |
||
| 819 | ASSERT(span->arrayMask & SPAN_RGBA); |
||
| 820 | ASSERT(swrast->_ActiveAttribMask & FRAG_BIT_COL1); |
||
| 821 | (void) swrast; /* silence warning */ |
||
| 822 | |||
| 823 | if (span->array->ChanType == GL_FLOAT) { |
||
| 824 | if ((span->arrayAttribs & FRAG_BIT_COL0) == 0) { |
||
| 825 | interpolate_active_attribs(ctx, span, FRAG_BIT_COL0); |
||
| 826 | } |
||
| 827 | } |
||
| 828 | else { |
||
| 829 | /* need float colors */ |
||
| 830 | if ((span->arrayAttribs & FRAG_BIT_COL0) == 0) { |
||
| 831 | interpolate_float_colors(span); |
||
| 832 | } |
||
| 833 | } |
||
| 834 | |||
| 835 | if ((span->arrayAttribs & FRAG_BIT_COL1) == 0) { |
||
| 836 | /* XXX could avoid this and interpolate COL1 in the loop below */ |
||
| 837 | interpolate_active_attribs(ctx, span, FRAG_BIT_COL1); |
||
| 838 | } |
||
| 839 | |||
| 840 | ASSERT(span->arrayAttribs & FRAG_BIT_COL0); |
||
| 841 | ASSERT(span->arrayAttribs & FRAG_BIT_COL1); |
||
| 842 | |||
| 843 | for (i = 0; i < span->end; i++) { |
||
| 844 | if (mask[i]) { |
||
| 845 | col0[i][0] += col1[i][0]; |
||
| 846 | col0[i][1] += col1[i][1]; |
||
| 847 | col0[i][2] += col1[i][2]; |
||
| 848 | } |
||
| 849 | } |
||
| 850 | |||
| 851 | span->array->ChanType = GL_FLOAT; |
||
| 852 | } |
||
| 853 | |||
| 854 | |||
| 855 | /** |
||
| 856 | * Apply antialiasing coverage value to alpha values. |
||
| 857 | */ |
||
| 858 | static INLINE void |
||
| 859 | apply_aa_coverage(SWspan *span) |
||
| 860 | { |
||
| 861 | const GLfloat *coverage = span->array->coverage; |
||
| 862 | GLuint i; |
||
| 863 | if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
||
| 864 | GLubyte (*rgba)[4] = span->array->rgba8; |
||
| 865 | for (i = 0; i < span->end; i++) { |
||
| 866 | const GLfloat a = rgba[i][ACOMP] * coverage[i]; |
||
| 867 | rgba[i][ACOMP] = (GLubyte) CLAMP(a, 0.0, 255.0); |
||
| 868 | ASSERT(coverage[i] >= 0.0); |
||
| 869 | ASSERT(coverage[i] <= 1.0); |
||
| 870 | } |
||
| 871 | } |
||
| 872 | else if (span->array->ChanType == GL_UNSIGNED_SHORT) { |
||
| 873 | GLushort (*rgba)[4] = span->array->rgba16; |
||
| 874 | for (i = 0; i < span->end; i++) { |
||
| 875 | const GLfloat a = rgba[i][ACOMP] * coverage[i]; |
||
| 876 | rgba[i][ACOMP] = (GLushort) CLAMP(a, 0.0, 65535.0); |
||
| 877 | } |
||
| 878 | } |
||
| 879 | else { |
||
| 880 | GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; |
||
| 881 | for (i = 0; i < span->end; i++) { |
||
| 882 | rgba[i][ACOMP] = rgba[i][ACOMP] * coverage[i]; |
||
| 883 | /* clamp later */ |
||
| 884 | } |
||
| 885 | } |
||
| 886 | } |
||
| 887 | |||
| 888 | |||
| 889 | /** |
||
| 890 | * Clamp span's float colors to [0,1] |
||
| 891 | */ |
||
| 892 | static INLINE void |
||
| 893 | clamp_colors(SWspan *span) |
||
| 894 | { |
||
| 895 | GLfloat (*rgba)[4] = span->array->attribs[FRAG_ATTRIB_COL0]; |
||
| 896 | GLuint i; |
||
| 897 | ASSERT(span->array->ChanType == GL_FLOAT); |
||
| 898 | for (i = 0; i < span->end; i++) { |
||
| 899 | rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F); |
||
| 900 | rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F); |
||
| 901 | rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F); |
||
| 902 | rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F); |
||
| 903 | } |
||
| 904 | } |
||
| 905 | |||
| 906 | |||
| 907 | /** |
||
| 908 | * Convert the span's color arrays to the given type. |
||
| 909 | * The only way 'output' can be greater than zero is when we have a fragment |
||
| 910 | * program that writes to gl_FragData[1] or higher. |
||
| 911 | * \param output which fragment program color output is being processed |
||
| 912 | */ |
||
| 913 | static INLINE void |
||
| 914 | convert_color_type(SWspan *span, GLenum newType, GLuint output) |
||
| 915 | { |
||
| 916 | GLvoid *src, *dst; |
||
| 917 | |||
| 918 | if (output > 0 || span->array->ChanType == GL_FLOAT) { |
||
| 919 | src = span->array->attribs[FRAG_ATTRIB_COL0 + output]; |
||
| 920 | span->array->ChanType = GL_FLOAT; |
||
| 921 | } |
||
| 922 | else if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
||
| 923 | src = span->array->rgba8; |
||
| 924 | } |
||
| 925 | else { |
||
| 926 | ASSERT(span->array->ChanType == GL_UNSIGNED_SHORT); |
||
| 927 | src = span->array->rgba16; |
||
| 928 | } |
||
| 929 | |||
| 930 | if (newType == GL_UNSIGNED_BYTE) { |
||
| 931 | dst = span->array->rgba8; |
||
| 932 | } |
||
| 933 | else if (newType == GL_UNSIGNED_SHORT) { |
||
| 934 | dst = span->array->rgba16; |
||
| 935 | } |
||
| 936 | else { |
||
| 937 | dst = span->array->attribs[FRAG_ATTRIB_COL0]; |
||
| 938 | } |
||
| 939 | |||
| 940 | _mesa_convert_colors(span->array->ChanType, src, |
||
| 941 | newType, dst, |
||
| 942 | span->end, span->array->mask); |
||
| 943 | |||
| 944 | span->array->ChanType = newType; |
||
| 945 | span->array->rgba = dst; |
||
| 946 | } |
||
| 947 | |||
| 948 | |||
| 949 | |||
| 950 | /** |
||
| 951 | * Apply fragment shader, fragment program or normal texturing to span. |
||
| 952 | */ |
||
| 953 | static INLINE void |
||
| 954 | shade_texture_span(struct gl_context *ctx, SWspan *span) |
||
| 955 | { |
||
| 956 | GLbitfield inputsRead; |
||
| 957 | |||
| 958 | /* Determine which fragment attributes are actually needed */ |
||
| 959 | if (ctx->FragmentProgram._Current) { |
||
| 960 | inputsRead = ctx->FragmentProgram._Current->Base.InputsRead; |
||
| 961 | } |
||
| 962 | else { |
||
| 963 | /* XXX we could be a bit smarter about this */ |
||
| 964 | inputsRead = ~0; |
||
| 965 | } |
||
| 966 | |||
| 967 | if (ctx->FragmentProgram._Current || |
||
| 968 | ctx->ATIFragmentShader._Enabled) { |
||
| 969 | /* programmable shading */ |
||
| 970 | if (span->primitive == GL_BITMAP && span->array->ChanType != GL_FLOAT) { |
||
| 971 | convert_color_type(span, GL_FLOAT, 0); |
||
| 972 | } |
||
| 973 | else { |
||
| 974 | span->array->rgba = (void *) span->array->attribs[FRAG_ATTRIB_COL0]; |
||
| 975 | } |
||
| 976 | |||
| 977 | if (span->primitive != GL_POINT || |
||
| 978 | (span->interpMask & SPAN_RGBA) || |
||
| 979 | ctx->Point.PointSprite) { |
||
| 980 | /* for single-pixel points, we populated the arrays already */ |
||
| 981 | interpolate_active_attribs(ctx, span, ~0); |
||
| 982 | } |
||
| 983 | span->array->ChanType = GL_FLOAT; |
||
| 984 | |||
| 985 | if (!(span->arrayMask & SPAN_Z)) |
||
| 986 | _swrast_span_interpolate_z (ctx, span); |
||
| 987 | |||
| 988 | #if 0 |
||
| 989 | if (inputsRead & FRAG_BIT_WPOS) |
||
| 990 | #else |
||
| 991 | /* XXX always interpolate wpos so that DDX/DDY work */ |
||
| 992 | #endif |
||
| 993 | interpolate_wpos(ctx, span); |
||
| 994 | |||
| 995 | /* Run fragment program/shader now */ |
||
| 996 | if (ctx->FragmentProgram._Current) { |
||
| 997 | _swrast_exec_fragment_program(ctx, span); |
||
| 998 | } |
||
| 999 | else { |
||
| 1000 | ASSERT(ctx->ATIFragmentShader._Enabled); |
||
| 1001 | _swrast_exec_fragment_shader(ctx, span); |
||
| 1002 | } |
||
| 1003 | } |
||
| 1004 | else if (ctx->Texture._EnabledCoordUnits) { |
||
| 1005 | /* conventional texturing */ |
||
| 1006 | |||
| 1007 | #if CHAN_BITS == 32 |
||
| 1008 | if ((span->arrayAttribs & FRAG_BIT_COL0) == 0) { |
||
| 1009 | interpolate_int_colors(ctx, span); |
||
| 1010 | } |
||
| 1011 | #else |
||
| 1012 | if (!(span->arrayMask & SPAN_RGBA)) |
||
| 1013 | interpolate_int_colors(ctx, span); |
||
| 1014 | #endif |
||
| 1015 | if ((span->arrayAttribs & FRAG_BITS_TEX_ANY) == 0x0) |
||
| 1016 | interpolate_texcoords(ctx, span); |
||
| 1017 | |||
| 1018 | _swrast_texture_span(ctx, span); |
||
| 1019 | } |
||
| 1020 | } |
||
| 1021 | |||
| 1022 | |||
| 1023 | |||
| 1024 | /** |
||
| 1025 | * Apply all the per-fragment operations to a span. |
||
| 1026 | * This now includes texturing (_swrast_write_texture_span() is history). |
||
| 1027 | * This function may modify any of the array values in the span. |
||
| 1028 | * span->interpMask and span->arrayMask may be changed but will be restored |
||
| 1029 | * to their original values before returning. |
||
| 1030 | */ |
||
| 1031 | void |
||
| 1032 | _swrast_write_rgba_span( struct gl_context *ctx, SWspan *span) |
||
| 1033 | { |
||
| 1034 | const SWcontext *swrast = SWRAST_CONTEXT(ctx); |
||
| 1035 | const GLuint *colorMask = (GLuint *) ctx->Color.ColorMask; |
||
| 1036 | const GLbitfield origInterpMask = span->interpMask; |
||
| 1037 | const GLbitfield origArrayMask = span->arrayMask; |
||
| 1038 | const GLbitfield origArrayAttribs = span->arrayAttribs; |
||
| 1039 | const GLenum origChanType = span->array->ChanType; |
||
| 1040 | void * const origRgba = span->array->rgba; |
||
| 1041 | const GLboolean shader = (ctx->FragmentProgram._Current |
||
| 1042 | || ctx->ATIFragmentShader._Enabled); |
||
| 1043 | const GLboolean shaderOrTexture = shader || ctx->Texture._EnabledCoordUnits; |
||
| 1044 | struct gl_framebuffer *fb = ctx->DrawBuffer; |
||
| 1045 | |||
| 1046 | /* |
||
| 1047 | printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, |
||
| 1048 | span->interpMask, span->arrayMask); |
||
| 1049 | */ |
||
| 1050 | |||
| 1051 | ASSERT(span->primitive == GL_POINT || |
||
| 1052 | span->primitive == GL_LINE || |
||
| 1053 | span->primitive == GL_POLYGON || |
||
| 1054 | span->primitive == GL_BITMAP); |
||
| 1055 | |||
| 1056 | /* Fragment write masks */ |
||
| 1057 | if (span->arrayMask & SPAN_MASK) { |
||
| 1058 | /* mask was initialized by caller, probably glBitmap */ |
||
| 1059 | span->writeAll = GL_FALSE; |
||
| 1060 | } |
||
| 1061 | else { |
||
| 1062 | memset(span->array->mask, 1, span->end); |
||
| 1063 | span->writeAll = GL_TRUE; |
||
| 1064 | } |
||
| 1065 | |||
| 1066 | /* Clip to window/scissor box */ |
||
| 1067 | if (!clip_span(ctx, span)) { |
||
| 1068 | return; |
||
| 1069 | } |
||
| 1070 | |||
| 1071 | ASSERT(span->end <= MAX_WIDTH); |
||
| 1072 | |||
| 1073 | /* Depth bounds test */ |
||
| 1074 | if (ctx->Depth.BoundsTest && fb->Visual.depthBits > 0) { |
||
| 1075 | if (!_swrast_depth_bounds_test(ctx, span)) { |
||
| 1076 | return; |
||
| 1077 | } |
||
| 1078 | } |
||
| 1079 | |||
| 1080 | #ifdef DEBUG |
||
| 1081 | /* Make sure all fragments are within window bounds */ |
||
| 1082 | if (span->arrayMask & SPAN_XY) { |
||
| 1083 | /* array of pixel locations */ |
||
| 1084 | GLuint i; |
||
| 1085 | for (i = 0; i < span->end; i++) { |
||
| 1086 | if (span->array->mask[i]) { |
||
| 1087 | assert(span->array->x[i] >= fb->_Xmin); |
||
| 1088 | assert(span->array->x[i] < fb->_Xmax); |
||
| 1089 | assert(span->array->y[i] >= fb->_Ymin); |
||
| 1090 | assert(span->array->y[i] < fb->_Ymax); |
||
| 1091 | } |
||
| 1092 | } |
||
| 1093 | } |
||
| 1094 | #endif |
||
| 1095 | |||
| 1096 | /* Polygon Stippling */ |
||
| 1097 | if (ctx->Polygon.StippleFlag && span->primitive == GL_POLYGON) { |
||
| 1098 | stipple_polygon_span(ctx, span); |
||
| 1099 | } |
||
| 1100 | |||
| 1101 | /* This is the normal place to compute the fragment color/Z |
||
| 1102 | * from texturing or shading. |
||
| 1103 | */ |
||
| 1104 | if (shaderOrTexture && !swrast->_DeferredTexture) { |
||
| 1105 | shade_texture_span(ctx, span); |
||
| 1106 | } |
||
| 1107 | |||
| 1108 | /* Do the alpha test */ |
||
| 1109 | if (ctx->Color.AlphaEnabled) { |
||
| 1110 | if (!_swrast_alpha_test(ctx, span)) { |
||
| 1111 | /* all fragments failed test */ |
||
| 1112 | goto end; |
||
| 1113 | } |
||
| 1114 | } |
||
| 1115 | |||
| 1116 | /* Stencil and Z testing */ |
||
| 1117 | if (ctx->Stencil._Enabled || ctx->Depth.Test) { |
||
| 1118 | if (!(span->arrayMask & SPAN_Z)) |
||
| 1119 | _swrast_span_interpolate_z(ctx, span); |
||
| 1120 | |||
| 1121 | if (ctx->Transform.DepthClamp) |
||
| 1122 | _swrast_depth_clamp_span(ctx, span); |
||
| 1123 | |||
| 1124 | if (ctx->Stencil._Enabled) { |
||
| 1125 | /* Combined Z/stencil tests */ |
||
| 1126 | if (!_swrast_stencil_and_ztest_span(ctx, span)) { |
||
| 1127 | /* all fragments failed test */ |
||
| 1128 | goto end; |
||
| 1129 | } |
||
| 1130 | } |
||
| 1131 | else if (fb->Visual.depthBits > 0) { |
||
| 1132 | /* Just regular depth testing */ |
||
| 1133 | ASSERT(ctx->Depth.Test); |
||
| 1134 | ASSERT(span->arrayMask & SPAN_Z); |
||
| 1135 | if (!_swrast_depth_test_span(ctx, span)) { |
||
| 1136 | /* all fragments failed test */ |
||
| 1137 | goto end; |
||
| 1138 | } |
||
| 1139 | } |
||
| 1140 | } |
||
| 1141 | |||
| 1142 | if (ctx->Query.CurrentOcclusionObject) { |
||
| 1143 | /* update count of 'passed' fragments */ |
||
| 1144 | struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; |
||
| 1145 | GLuint i; |
||
| 1146 | for (i = 0; i < span->end; i++) |
||
| 1147 | q->Result += span->array->mask[i]; |
||
| 1148 | } |
||
| 1149 | |||
| 1150 | /* We had to wait until now to check for glColorMask(0,0,0,0) because of |
||
| 1151 | * the occlusion test. |
||
| 1152 | */ |
||
| 1153 | if (fb->_NumColorDrawBuffers == 1 && colorMask[0] == 0x0) { |
||
| 1154 | /* no colors to write */ |
||
| 1155 | goto end; |
||
| 1156 | } |
||
| 1157 | |||
| 1158 | /* If we were able to defer fragment color computation to now, there's |
||
| 1159 | * a good chance that many fragments will have already been killed by |
||
| 1160 | * Z/stencil testing. |
||
| 1161 | */ |
||
| 1162 | if (shaderOrTexture && swrast->_DeferredTexture) { |
||
| 1163 | shade_texture_span(ctx, span); |
||
| 1164 | } |
||
| 1165 | |||
| 1166 | #if CHAN_BITS == 32 |
||
| 1167 | if ((span->arrayAttribs & FRAG_BIT_COL0) == 0) { |
||
| 1168 | interpolate_active_attribs(ctx, span, FRAG_BIT_COL0); |
||
| 1169 | } |
||
| 1170 | #else |
||
| 1171 | if ((span->arrayMask & SPAN_RGBA) == 0) { |
||
| 1172 | interpolate_int_colors(ctx, span); |
||
| 1173 | } |
||
| 1174 | #endif |
||
| 1175 | |||
| 1176 | ASSERT(span->arrayMask & SPAN_RGBA); |
||
| 1177 | |||
| 1178 | if (span->primitive == GL_BITMAP || !swrast->SpecularVertexAdd) { |
||
| 1179 | /* Add primary and specular (diffuse + specular) colors */ |
||
| 1180 | if (!shader) { |
||
| 1181 | if (ctx->Fog.ColorSumEnabled || |
||
| 1182 | (ctx->Light.Enabled && |
||
| 1183 | ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) { |
||
| 1184 | add_specular(ctx, span); |
||
| 1185 | } |
||
| 1186 | } |
||
| 1187 | } |
||
| 1188 | |||
| 1189 | /* Fog */ |
||
| 1190 | if (swrast->_FogEnabled) { |
||
| 1191 | _swrast_fog_rgba_span(ctx, span); |
||
| 1192 | } |
||
| 1193 | |||
| 1194 | /* Antialias coverage application */ |
||
| 1195 | if (span->arrayMask & SPAN_COVERAGE) { |
||
| 1196 | apply_aa_coverage(span); |
||
| 1197 | } |
||
| 1198 | |||
| 1199 | /* Clamp color/alpha values over the range [0.0, 1.0] before storage */ |
||
| 1200 | if (ctx->Color.ClampFragmentColor == GL_TRUE && |
||
| 1201 | span->array->ChanType == GL_FLOAT) { |
||
| 1202 | clamp_colors(span); |
||
| 1203 | } |
||
| 1204 | |||
| 1205 | /* |
||
| 1206 | * Write to renderbuffers. |
||
| 1207 | * Depending on glDrawBuffer() state and the which color outputs are |
||
| 1208 | * written by the fragment shader, we may either replicate one color to |
||
| 1209 | * all renderbuffers or write a different color to each renderbuffer. |
||
| 1210 | * multiFragOutputs=TRUE for the later case. |
||
| 1211 | */ |
||
| 1212 | { |
||
| 1213 | const GLuint numBuffers = fb->_NumColorDrawBuffers; |
||
| 1214 | const struct gl_fragment_program *fp = ctx->FragmentProgram._Current; |
||
| 1215 | const GLboolean multiFragOutputs = |
||
| 1216 | (fp && fp->Base.OutputsWritten >= (1 << FRAG_RESULT_DATA0)); |
||
| 1217 | GLuint buf; |
||
| 1218 | |||
| 1219 | for (buf = 0; buf < numBuffers; buf++) { |
||
| 1220 | struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[buf]; |
||
| 1221 | |||
| 1222 | /* color[fragOutput] will be written to buffer[buf] */ |
||
| 1223 | |||
| 1224 | if (rb) { |
||
| 1225 | GLchan rgbaSave[MAX_WIDTH][4]; |
||
| 1226 | const GLuint fragOutput = multiFragOutputs ? buf : 0; |
||
| 1227 | |||
| 1228 | /* set span->array->rgba to colors for render buffer's datatype */ |
||
| 1229 | if (rb->DataType != span->array->ChanType || fragOutput > 0) { |
||
| 1230 | convert_color_type(span, rb->DataType, fragOutput); |
||
| 1231 | } |
||
| 1232 | else { |
||
| 1233 | if (rb->DataType == GL_UNSIGNED_BYTE) { |
||
| 1234 | span->array->rgba = span->array->rgba8; |
||
| 1235 | } |
||
| 1236 | else if (rb->DataType == GL_UNSIGNED_SHORT) { |
||
| 1237 | span->array->rgba = (void *) span->array->rgba16; |
||
| 1238 | } |
||
| 1239 | else { |
||
| 1240 | span->array->rgba = (void *) |
||
| 1241 | span->array->attribs[FRAG_ATTRIB_COL0]; |
||
| 1242 | } |
||
| 1243 | } |
||
| 1244 | |||
| 1245 | if (!multiFragOutputs && numBuffers > 1) { |
||
| 1246 | /* save colors for second, third renderbuffer writes */ |
||
| 1247 | memcpy(rgbaSave, span->array->rgba, |
||
| 1248 | 4 * span->end * sizeof(GLchan)); |
||
| 1249 | } |
||
| 1250 | |||
| 1251 | ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB || |
||
| 1252 | rb->_BaseFormat == GL_ALPHA); |
||
| 1253 | |||
| 1254 | if (ctx->Color._LogicOpEnabled) { |
||
| 1255 | _swrast_logicop_rgba_span(ctx, rb, span); |
||
| 1256 | } |
||
| 1257 | else if ((ctx->Color.BlendEnabled >> buf) & 1) { |
||
| 1258 | _swrast_blend_span(ctx, rb, span); |
||
| 1259 | } |
||
| 1260 | |||
| 1261 | if (colorMask[buf] != 0xffffffff) { |
||
| 1262 | _swrast_mask_rgba_span(ctx, rb, span, buf); |
||
| 1263 | } |
||
| 1264 | |||
| 1265 | if (span->arrayMask & SPAN_XY) { |
||
| 1266 | /* array of pixel coords */ |
||
| 1267 | ASSERT(rb->PutValues); |
||
| 1268 | rb->PutValues(ctx, rb, span->end, |
||
| 1269 | span->array->x, span->array->y, |
||
| 1270 | span->array->rgba, span->array->mask); |
||
| 1271 | } |
||
| 1272 | else { |
||
| 1273 | /* horizontal run of pixels */ |
||
| 1274 | ASSERT(rb->PutRow); |
||
| 1275 | rb->PutRow(ctx, rb, span->end, span->x, span->y, |
||
| 1276 | span->array->rgba, |
||
| 1277 | span->writeAll ? NULL: span->array->mask); |
||
| 1278 | } |
||
| 1279 | |||
| 1280 | if (!multiFragOutputs && numBuffers > 1) { |
||
| 1281 | /* restore original span values */ |
||
| 1282 | memcpy(span->array->rgba, rgbaSave, |
||
| 1283 | 4 * span->end * sizeof(GLchan)); |
||
| 1284 | } |
||
| 1285 | |||
| 1286 | } /* if rb */ |
||
| 1287 | } /* for buf */ |
||
| 1288 | } |
||
| 1289 | |||
| 1290 | end: |
||
| 1291 | /* restore these values before returning */ |
||
| 1292 | span->interpMask = origInterpMask; |
||
| 1293 | span->arrayMask = origArrayMask; |
||
| 1294 | span->arrayAttribs = origArrayAttribs; |
||
| 1295 | span->array->ChanType = origChanType; |
||
| 1296 | span->array->rgba = origRgba; |
||
| 1297 | } |
||
| 1298 | |||
| 1299 | |||
| 1300 | /** |
||
| 1301 | * Read RGBA pixels from a renderbuffer. Clipping will be done to prevent |
||
| 1302 | * reading ouside the buffer's boundaries. |
||
| 1303 | * \param dstType datatype for returned colors |
||
| 1304 | * \param rgba the returned colors |
||
| 1305 | */ |
||
| 1306 | void |
||
| 1307 | _swrast_read_rgba_span( struct gl_context *ctx, struct gl_renderbuffer *rb, |
||
| 1308 | GLuint n, GLint x, GLint y, GLenum dstType, |
||
| 1309 | GLvoid *rgba) |
||
| 1310 | { |
||
| 1311 | const GLint bufWidth = (GLint) rb->Width; |
||
| 1312 | const GLint bufHeight = (GLint) rb->Height; |
||
| 1313 | |||
| 1314 | if (y < 0 || y >= bufHeight || x + (GLint) n < 0 || x >= bufWidth) { |
||
| 1315 | /* completely above, below, or right */ |
||
| 1316 | /* XXX maybe leave rgba values undefined? */ |
||
| 1317 | memset(rgba, 0, 4 * n * sizeof(GLchan)); |
||
| 1318 | } |
||
| 1319 | else { |
||
| 1320 | GLint skip, length; |
||
| 1321 | if (x < 0) { |
||
| 1322 | /* left edge clipping */ |
||
| 1323 | skip = -x; |
||
| 1324 | length = (GLint) n - skip; |
||
| 1325 | if (length < 0) { |
||
| 1326 | /* completely left of window */ |
||
| 1327 | return; |
||
| 1328 | } |
||
| 1329 | if (length > bufWidth) { |
||
| 1330 | length = bufWidth; |
||
| 1331 | } |
||
| 1332 | } |
||
| 1333 | else if ((GLint) (x + n) > bufWidth) { |
||
| 1334 | /* right edge clipping */ |
||
| 1335 | skip = 0; |
||
| 1336 | length = bufWidth - x; |
||
| 1337 | if (length < 0) { |
||
| 1338 | /* completely to right of window */ |
||
| 1339 | return; |
||
| 1340 | } |
||
| 1341 | } |
||
| 1342 | else { |
||
| 1343 | /* no clipping */ |
||
| 1344 | skip = 0; |
||
| 1345 | length = (GLint) n; |
||
| 1346 | } |
||
| 1347 | |||
| 1348 | ASSERT(rb); |
||
| 1349 | ASSERT(rb->GetRow); |
||
| 1350 | ASSERT(rb->_BaseFormat == GL_RGB || rb->_BaseFormat == GL_RGBA || |
||
| 1351 | rb->_BaseFormat == GL_ALPHA); |
||
| 1352 | |||
| 1353 | if (rb->DataType == dstType) { |
||
| 1354 | rb->GetRow(ctx, rb, length, x + skip, y, |
||
| 1355 | (GLubyte *) rgba + skip * RGBA_PIXEL_SIZE(rb->DataType)); |
||
| 1356 | } |
||
| 1357 | else { |
||
| 1358 | GLuint temp[MAX_WIDTH * 4]; |
||
| 1359 | rb->GetRow(ctx, rb, length, x + skip, y, temp); |
||
| 1360 | _mesa_convert_colors(rb->DataType, temp, |
||
| 1361 | dstType, (GLubyte *) rgba + skip * RGBA_PIXEL_SIZE(dstType), |
||
| 1362 | length, NULL); |
||
| 1363 | } |
||
| 1364 | } |
||
| 1365 | } |
||
| 1366 | |||
| 1367 | |||
| 1368 | /** |
||
| 1369 | * Wrapper for gl_renderbuffer::GetValues() which does clipping to avoid |
||
| 1370 | * reading values outside the buffer bounds. |
||
| 1371 | * We can use this for reading any format/type of renderbuffer. |
||
| 1372 | * \param valueSize is the size in bytes of each value (pixel) put into the |
||
| 1373 | * values array. |
||
| 1374 | */ |
||
| 1375 | void |
||
| 1376 | _swrast_get_values(struct gl_context *ctx, struct gl_renderbuffer *rb, |
||
| 1377 | GLuint count, const GLint x[], const GLint y[], |
||
| 1378 | void *values, GLuint valueSize) |
||
| 1379 | { |
||
| 1380 | GLuint i, inCount = 0, inStart = 0; |
||
| 1381 | |||
| 1382 | for (i = 0; i < count; i++) { |
||
| 1383 | if (x[i] >= 0 && y[i] >= 0 && |
||
| 1384 | x[i] < (GLint) rb->Width && y[i] < (GLint) rb->Height) { |
||
| 1385 | /* inside */ |
||
| 1386 | if (inCount == 0) |
||
| 1387 | inStart = i; |
||
| 1388 | inCount++; |
||
| 1389 | } |
||
| 1390 | else { |
||
| 1391 | if (inCount > 0) { |
||
| 1392 | /* read [inStart, inStart + inCount) */ |
||
| 1393 | rb->GetValues(ctx, rb, inCount, x + inStart, y + inStart, |
||
| 1394 | (GLubyte *) values + inStart * valueSize); |
||
| 1395 | inCount = 0; |
||
| 1396 | } |
||
| 1397 | } |
||
| 1398 | } |
||
| 1399 | if (inCount > 0) { |
||
| 1400 | /* read last values */ |
||
| 1401 | rb->GetValues(ctx, rb, inCount, x + inStart, y + inStart, |
||
| 1402 | (GLubyte *) values + inStart * valueSize); |
||
| 1403 | } |
||
| 1404 | } |
||
| 1405 | |||
| 1406 | |||
| 1407 | /** |
||
| 1408 | * Wrapper for gl_renderbuffer::PutRow() which does clipping. |
||
| 1409 | * \param valueSize size of each value (pixel) in bytes |
||
| 1410 | */ |
||
| 1411 | void |
||
| 1412 | _swrast_put_row(struct gl_context *ctx, struct gl_renderbuffer *rb, |
||
| 1413 | GLuint count, GLint x, GLint y, |
||
| 1414 | const GLvoid *values, GLuint valueSize) |
||
| 1415 | { |
||
| 1416 | GLint skip = 0; |
||
| 1417 | |||
| 1418 | if (y < 0 || y >= (GLint) rb->Height) |
||
| 1419 | return; /* above or below */ |
||
| 1420 | |||
| 1421 | if (x + (GLint) count <= 0 || x >= (GLint) rb->Width) |
||
| 1422 | return; /* entirely left or right */ |
||
| 1423 | |||
| 1424 | if ((GLint) (x + count) > (GLint) rb->Width) { |
||
| 1425 | /* right clip */ |
||
| 1426 | GLint clip = x + count - rb->Width; |
||
| 1427 | count -= clip; |
||
| 1428 | } |
||
| 1429 | |||
| 1430 | if (x < 0) { |
||
| 1431 | /* left clip */ |
||
| 1432 | skip = -x; |
||
| 1433 | x = 0; |
||
| 1434 | count -= skip; |
||
| 1435 | } |
||
| 1436 | |||
| 1437 | rb->PutRow(ctx, rb, count, x, y, |
||
| 1438 | (const GLubyte *) values + skip * valueSize, NULL); |
||
| 1439 | } |
||
| 1440 | |||
| 1441 | |||
| 1442 | /** |
||
| 1443 | * Wrapper for gl_renderbuffer::GetRow() which does clipping. |
||
| 1444 | * \param valueSize size of each value (pixel) in bytes |
||
| 1445 | */ |
||
| 1446 | void |
||
| 1447 | _swrast_get_row(struct gl_context *ctx, struct gl_renderbuffer *rb, |
||
| 1448 | GLuint count, GLint x, GLint y, |
||
| 1449 | GLvoid *values, GLuint valueSize) |
||
| 1450 | { |
||
| 1451 | GLint skip = 0; |
||
| 1452 | |||
| 1453 | if (y < 0 || y >= (GLint) rb->Height) |
||
| 1454 | return; /* above or below */ |
||
| 1455 | |||
| 1456 | if (x + (GLint) count <= 0 || x >= (GLint) rb->Width) |
||
| 1457 | return; /* entirely left or right */ |
||
| 1458 | |||
| 1459 | if (x + count > rb->Width) { |
||
| 1460 | /* right clip */ |
||
| 1461 | GLint clip = x + count - rb->Width; |
||
| 1462 | count -= clip; |
||
| 1463 | } |
||
| 1464 | |||
| 1465 | if (x < 0) { |
||
| 1466 | /* left clip */ |
||
| 1467 | skip = -x; |
||
| 1468 | x = 0; |
||
| 1469 | count -= skip; |
||
| 1470 | } |
||
| 1471 | |||
| 1472 | rb->GetRow(ctx, rb, count, x, y, (GLubyte *) values + skip * valueSize); |
||
| 1473 | } |
||
| 1474 | |||
| 1475 | |||
| 1476 | /** |
||
| 1477 | * Get RGBA pixels from the given renderbuffer. |
||
| 1478 | * Used by blending, logicop and masking functions. |
||
| 1479 | * \return pointer to the colors we read. |
||
| 1480 | */ |
||
| 1481 | void * |
||
| 1482 | _swrast_get_dest_rgba(struct gl_context *ctx, struct gl_renderbuffer *rb, |
||
| 1483 | SWspan *span) |
||
| 1484 | { |
||
| 1485 | const GLuint pixelSize = RGBA_PIXEL_SIZE(span->array->ChanType); |
||
| 1486 | void *rbPixels; |
||
| 1487 | |||
| 1488 | /* Point rbPixels to a temporary space */ |
||
| 1489 | rbPixels = span->array->attribs[FRAG_ATTRIB_MAX - 1]; |
||
| 1490 | |||
| 1491 | /* Get destination values from renderbuffer */ |
||
| 1492 | if (span->arrayMask & SPAN_XY) { |
||
| 1493 | _swrast_get_values(ctx, rb, span->end, span->array->x, span->array->y, |
||
| 1494 | rbPixels, pixelSize); |
||
| 1495 | } |
||
| 1496 | else { |
||
| 1497 | _swrast_get_row(ctx, rb, span->end, span->x, span->y, |
||
| 1498 | rbPixels, pixelSize); |
||
| 1499 | } |
||
| 1500 | |||
| 1501 | return rbPixels; |
||
| 1502 | } |