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| 1901 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * Version: 7.0 |
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| 4 | * |
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| 5 | * Copyright (C) 1999-2007 Brian Paul All Rights Reserved. |
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| 6 | * |
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| 7 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 8 | * copy of this software and associated documentation files (the "Software"), |
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| 9 | * to deal in the Software without restriction, including without limitation |
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| 10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 11 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 12 | * Software is furnished to do so, subject to the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice shall be included |
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| 15 | * in all copies or substantial portions of the Software. |
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| 16 | * |
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| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 18 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 20 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 21 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 22 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | * |
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| 24 | * Authors: |
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| 25 | * Brian Paul |
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| 26 | */ |
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| 27 | |||
| 28 | #include "main/glheader.h" |
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| 29 | #include "main/mtypes.h" |
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| 30 | #include "main/dd.h" |
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| 31 | #include "main/imports.h" |
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| 32 | #include "t_context.h" |
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| 33 | #include "t_pipeline.h" |
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| 34 | |||
| 35 | |||
| 36 | struct point_stage_data { |
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| 37 | GLvector4f PointSize; |
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| 38 | }; |
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| 39 | |||
| 40 | #define POINT_STAGE_DATA(stage) ((struct point_stage_data *)stage->privatePtr) |
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| 41 | |||
| 42 | |||
| 43 | /** |
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| 44 | * Compute point size for each vertex from the vertex eye-space Z |
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| 45 | * coordinate and the point size attenuation factors. |
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| 46 | * Only done when point size attenuation is enabled and vertex program is |
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| 47 | * disabled. |
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| 48 | */ |
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| 49 | static GLboolean |
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| 50 | run_point_stage(struct gl_context *ctx, struct tnl_pipeline_stage *stage) |
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| 51 | { |
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| 52 | if (ctx->Point._Attenuated && !ctx->VertexProgram._Current) { |
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| 53 | struct point_stage_data *store = POINT_STAGE_DATA(stage); |
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| 54 | struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
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| 55 | const GLfloat *eyeCoord = (GLfloat *) VB->EyePtr->data + 2; |
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| 56 | const GLint eyeCoordStride = VB->EyePtr->stride / sizeof(GLfloat); |
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| 57 | const GLfloat p0 = ctx->Point.Params[0]; |
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| 58 | const GLfloat p1 = ctx->Point.Params[1]; |
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| 59 | const GLfloat p2 = ctx->Point.Params[2]; |
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| 60 | const GLfloat pointSize = ctx->Point.Size; |
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| 61 | GLfloat (*size)[4] = store->PointSize.data; |
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| 62 | GLuint i; |
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| 63 | |||
| 64 | for (i = 0; i < VB->Count; i++) { |
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| 65 | const GLfloat dist = FABSF(*eyeCoord); |
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| 66 | const GLfloat q = p0 + dist * (p1 + dist * p2); |
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| 67 | const GLfloat atten = (q != 0.0F) ? SQRTF(1.0F / q) : 1.0F; |
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| 68 | size[i][0] = pointSize * atten; /* clamping done in rasterization */ |
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| 69 | eyeCoord += eyeCoordStride; |
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| 70 | } |
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| 71 | |||
| 72 | VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->PointSize; |
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| 73 | } |
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| 74 | |||
| 75 | return GL_TRUE; |
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| 76 | } |
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| 77 | |||
| 78 | |||
| 79 | static GLboolean |
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| 80 | alloc_point_data(struct gl_context *ctx, struct tnl_pipeline_stage *stage) |
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| 81 | { |
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| 82 | struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
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| 83 | struct point_stage_data *store; |
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| 84 | stage->privatePtr = malloc(sizeof(*store)); |
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| 85 | store = POINT_STAGE_DATA(stage); |
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| 86 | if (!store) |
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| 87 | return GL_FALSE; |
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| 88 | |||
| 89 | _mesa_vector4f_alloc( &store->PointSize, 0, VB->Size, 32 ); |
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| 90 | return GL_TRUE; |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 | static void |
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| 95 | free_point_data(struct tnl_pipeline_stage *stage) |
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| 96 | { |
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| 97 | struct point_stage_data *store = POINT_STAGE_DATA(stage); |
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| 98 | if (store) { |
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| 99 | _mesa_vector4f_free( &store->PointSize ); |
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| 100 | free( store ); |
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| 101 | stage->privatePtr = NULL; |
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| 102 | } |
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| 103 | } |
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| 104 | |||
| 105 | |||
| 106 | const struct tnl_pipeline_stage _tnl_point_attenuation_stage = |
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| 107 | { |
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| 108 | "point size attenuation", /* name */ |
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| 109 | NULL, /* stage private data */ |
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| 110 | alloc_point_data, /* alloc data */ |
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| 111 | free_point_data, /* destructor */ |
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| 112 | NULL, |
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| 113 | run_point_stage /* run */ |
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| 114 | }; |