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| Rev | Author | Line No. | Line |
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| 1901 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * Version: 7.1 |
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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 | |||
| 25 | |||
| 26 | #include "main/glheader.h" |
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| 27 | #include "main/colormac.h" |
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| 28 | #include "main/feedback.h" |
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| 29 | #include "main/light.h" |
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| 30 | #include "main/macros.h" |
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| 31 | #include "main/simple_list.h" |
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| 32 | #include "main/mtypes.h" |
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| 33 | |||
| 34 | #include "math/m_matrix.h" |
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| 35 | #include "tnl/tnl.h" |
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| 36 | |||
| 37 | |||
| 38 | |||
| 39 | /** |
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| 40 | * Clip a point against the view volume. |
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| 41 | * |
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| 42 | * \param v vertex vector describing the point to clip. |
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| 43 | * |
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| 44 | * \return zero if outside view volume, or one if inside. |
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| 45 | */ |
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| 46 | static GLuint |
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| 47 | viewclip_point_xy( const GLfloat v[] ) |
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| 48 | { |
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| 49 | if ( v[0] > v[3] || v[0] < -v[3] |
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| 50 | || v[1] > v[3] || v[1] < -v[3] ) { |
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| 51 | return 0; |
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| 52 | } |
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| 53 | else { |
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| 54 | return 1; |
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| 55 | } |
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| 56 | } |
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| 57 | |||
| 58 | |||
| 59 | /** |
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| 60 | * Clip a point against the far/near Z clipping planes. |
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| 61 | * |
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| 62 | * \param v vertex vector describing the point to clip. |
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| 63 | * |
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| 64 | * \return zero if outside view volume, or one if inside. |
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| 65 | */ |
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| 66 | static GLuint |
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| 67 | viewclip_point_z( const GLfloat v[] ) |
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| 68 | { |
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| 69 | if (v[2] > v[3] || v[2] < -v[3] ) { |
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| 70 | return 0; |
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| 71 | } |
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| 72 | else { |
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| 73 | return 1; |
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| 74 | } |
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| 75 | } |
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| 76 | |||
| 77 | |||
| 78 | /** |
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| 79 | * Clip a point against the user clipping planes. |
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| 80 | * |
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| 81 | * \param ctx GL context. |
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| 82 | * \param v vertex vector describing the point to clip. |
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| 83 | * |
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| 84 | * \return zero if the point was clipped, or one otherwise. |
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| 85 | */ |
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| 86 | static GLuint |
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| 87 | userclip_point( struct gl_context *ctx, const GLfloat v[] ) |
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| 88 | { |
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| 89 | GLuint p; |
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| 90 | |||
| 91 | for (p = 0; p < ctx->Const.MaxClipPlanes; p++) { |
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| 92 | if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { |
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| 93 | GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0] |
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| 94 | + v[1] * ctx->Transform._ClipUserPlane[p][1] |
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| 95 | + v[2] * ctx->Transform._ClipUserPlane[p][2] |
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| 96 | + v[3] * ctx->Transform._ClipUserPlane[p][3]; |
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| 97 | if (dot < 0.0F) { |
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| 98 | return 0; |
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| 99 | } |
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| 100 | } |
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| 101 | } |
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| 102 | |||
| 103 | return 1; |
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| 104 | } |
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| 105 | |||
| 106 | |||
| 107 | /** |
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| 108 | * Compute lighting for the raster position. Both RGB and CI modes computed. |
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| 109 | * \param ctx the context |
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| 110 | * \param vertex vertex location |
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| 111 | * \param normal normal vector |
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| 112 | * \param Rcolor returned color |
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| 113 | * \param Rspec returned specular color (if separate specular enabled) |
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| 114 | * \param Rindex returned color index |
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| 115 | */ |
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| 116 | static void |
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| 117 | shade_rastpos(struct gl_context *ctx, |
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| 118 | const GLfloat vertex[4], |
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| 119 | const GLfloat normal[3], |
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| 120 | GLfloat Rcolor[4], |
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| 121 | GLfloat Rspec[4]) |
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| 122 | { |
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| 123 | /*const*/ GLfloat (*base)[3] = ctx->Light._BaseColor; |
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| 124 | const struct gl_light *light; |
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| 125 | GLfloat diffuseColor[4], specularColor[4]; /* for RGB mode only */ |
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| 126 | GLfloat diffuseCI = 0.0, specularCI = 0.0; /* for CI mode only */ |
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| 127 | |||
| 128 | _mesa_validate_all_lighting_tables( ctx ); |
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| 129 | |||
| 130 | COPY_3V(diffuseColor, base[0]); |
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| 131 | diffuseColor[3] = CLAMP( |
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| 132 | ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3], 0.0F, 1.0F ); |
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| 133 | ASSIGN_4V(specularColor, 0.0, 0.0, 0.0, 1.0); |
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| 134 | |||
| 135 | foreach (light, &ctx->Light.EnabledList) { |
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| 136 | GLfloat attenuation = 1.0; |
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| 137 | GLfloat VP[3]; /* vector from vertex to light pos */ |
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| 138 | GLfloat n_dot_VP; |
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| 139 | GLfloat diffuseContrib[3], specularContrib[3]; |
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| 140 | |||
| 141 | if (!(light->_Flags & LIGHT_POSITIONAL)) { |
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| 142 | /* light at infinity */ |
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| 143 | COPY_3V(VP, light->_VP_inf_norm); |
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| 144 | attenuation = light->_VP_inf_spot_attenuation; |
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| 145 | } |
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| 146 | else { |
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| 147 | /* local/positional light */ |
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| 148 | GLfloat d; |
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| 149 | |||
| 150 | /* VP = vector from vertex pos to light[i].pos */ |
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| 151 | SUB_3V(VP, light->_Position, vertex); |
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| 152 | /* d = length(VP) */ |
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| 153 | d = (GLfloat) LEN_3FV( VP ); |
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| 154 | if (d > 1.0e-6) { |
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| 155 | /* normalize VP */ |
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| 156 | GLfloat invd = 1.0F / d; |
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| 157 | SELF_SCALE_SCALAR_3V(VP, invd); |
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| 158 | } |
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| 159 | |||
| 160 | /* atti */ |
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| 161 | attenuation = 1.0F / (light->ConstantAttenuation + d * |
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| 162 | (light->LinearAttenuation + d * |
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| 163 | light->QuadraticAttenuation)); |
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| 164 | |||
| 165 | if (light->_Flags & LIGHT_SPOT) { |
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| 166 | GLfloat PV_dot_dir = - DOT3(VP, light->_NormSpotDirection); |
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| 167 | |||
| 168 | if (PV_dot_dir |
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| 169 | continue; |
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| 170 | } |
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| 171 | else { |
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| 172 | double x = PV_dot_dir * (EXP_TABLE_SIZE-1); |
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| 173 | int k = (int) x; |
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| 174 | GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0] |
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| 175 | + (x-k)*light->_SpotExpTable[k][1]); |
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| 176 | attenuation *= spot; |
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| 177 | } |
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| 178 | } |
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| 179 | } |
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| 180 | |||
| 181 | if (attenuation < 1e-3) |
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| 182 | continue; |
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| 183 | |||
| 184 | n_dot_VP = DOT3( normal, VP ); |
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| 185 | |||
| 186 | if (n_dot_VP < 0.0F) { |
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| 187 | ACC_SCALE_SCALAR_3V(diffuseColor, attenuation, light->_MatAmbient[0]); |
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| 188 | continue; |
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| 189 | } |
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| 190 | |||
| 191 | /* Ambient + diffuse */ |
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| 192 | COPY_3V(diffuseContrib, light->_MatAmbient[0]); |
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| 193 | ACC_SCALE_SCALAR_3V(diffuseContrib, n_dot_VP, light->_MatDiffuse[0]); |
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| 194 | diffuseCI += n_dot_VP * light->_dli * attenuation; |
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| 195 | |||
| 196 | /* Specular */ |
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| 197 | { |
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| 198 | const GLfloat *h; |
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| 199 | GLfloat n_dot_h; |
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| 200 | |||
| 201 | ASSIGN_3V(specularContrib, 0.0, 0.0, 0.0); |
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| 202 | |||
| 203 | if (ctx->Light.Model.LocalViewer) { |
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| 204 | GLfloat v[3]; |
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| 205 | COPY_3V(v, vertex); |
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| 206 | NORMALIZE_3FV(v); |
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| 207 | SUB_3V(VP, VP, v); |
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| 208 | NORMALIZE_3FV(VP); |
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| 209 | h = VP; |
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| 210 | } |
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| 211 | else if (light->_Flags & LIGHT_POSITIONAL) { |
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| 212 | ACC_3V(VP, ctx->_EyeZDir); |
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| 213 | NORMALIZE_3FV(VP); |
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| 214 | h = VP; |
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| 215 | } |
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| 216 | else { |
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| 217 | h = light->_h_inf_norm; |
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| 218 | } |
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| 219 | |||
| 220 | n_dot_h = DOT3(normal, h); |
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| 221 | |||
| 222 | if (n_dot_h > 0.0F) { |
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| 223 | GLfloat spec_coef; |
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| 224 | GET_SHINE_TAB_ENTRY( ctx->_ShineTable[0], n_dot_h, spec_coef ); |
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| 225 | |||
| 226 | if (spec_coef > 1.0e-10) { |
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| 227 | if (ctx->Light.Model.ColorControl==GL_SEPARATE_SPECULAR_COLOR) { |
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| 228 | ACC_SCALE_SCALAR_3V( specularContrib, spec_coef, |
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| 229 | light->_MatSpecular[0]); |
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| 230 | } |
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| 231 | else { |
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| 232 | ACC_SCALE_SCALAR_3V( diffuseContrib, spec_coef, |
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| 233 | light->_MatSpecular[0]); |
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| 234 | } |
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| 235 | /*assert(light->_sli > 0.0);*/ |
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| 236 | specularCI += spec_coef * light->_sli * attenuation; |
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| 237 | } |
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| 238 | } |
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| 239 | } |
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| 240 | |||
| 241 | ACC_SCALE_SCALAR_3V( diffuseColor, attenuation, diffuseContrib ); |
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| 242 | ACC_SCALE_SCALAR_3V( specularColor, attenuation, specularContrib ); |
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| 243 | } |
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| 244 | |||
| 245 | Rcolor[0] = CLAMP(diffuseColor[0], 0.0F, 1.0F); |
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| 246 | Rcolor[1] = CLAMP(diffuseColor[1], 0.0F, 1.0F); |
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| 247 | Rcolor[2] = CLAMP(diffuseColor[2], 0.0F, 1.0F); |
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| 248 | Rcolor[3] = CLAMP(diffuseColor[3], 0.0F, 1.0F); |
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| 249 | Rspec[0] = CLAMP(specularColor[0], 0.0F, 1.0F); |
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| 250 | Rspec[1] = CLAMP(specularColor[1], 0.0F, 1.0F); |
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| 251 | Rspec[2] = CLAMP(specularColor[2], 0.0F, 1.0F); |
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| 252 | Rspec[3] = CLAMP(specularColor[3], 0.0F, 1.0F); |
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| 253 | } |
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| 254 | |||
| 255 | |||
| 256 | /** |
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| 257 | * Do texgen needed for glRasterPos. |
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| 258 | * \param ctx rendering context |
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| 259 | * \param vObj object-space vertex coordinate |
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| 260 | * \param vEye eye-space vertex coordinate |
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| 261 | * \param normal vertex normal |
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| 262 | * \param unit texture unit number |
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| 263 | * \param texcoord incoming texcoord and resulting texcoord |
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| 264 | */ |
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| 265 | static void |
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| 266 | compute_texgen(struct gl_context *ctx, const GLfloat vObj[4], const GLfloat vEye[4], |
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| 267 | const GLfloat normal[3], GLuint unit, GLfloat texcoord[4]) |
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| 268 | { |
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| 269 | const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; |
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| 270 | |||
| 271 | /* always compute sphere map terms, just in case */ |
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| 272 | GLfloat u[3], two_nu, rx, ry, rz, m, mInv; |
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| 273 | COPY_3V(u, vEye); |
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| 274 | NORMALIZE_3FV(u); |
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| 275 | two_nu = 2.0F * DOT3(normal, u); |
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| 276 | rx = u[0] - normal[0] * two_nu; |
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| 277 | ry = u[1] - normal[1] * two_nu; |
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| 278 | rz = u[2] - normal[2] * two_nu; |
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| 279 | m = rx * rx + ry * ry + (rz + 1.0F) * (rz + 1.0F); |
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| 280 | if (m > 0.0F) |
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| 281 | mInv = 0.5F * _mesa_inv_sqrtf(m); |
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| 282 | else |
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| 283 | mInv = 0.0F; |
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| 284 | |||
| 285 | if (texUnit->TexGenEnabled & S_BIT) { |
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| 286 | switch (texUnit->GenS.Mode) { |
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| 287 | case GL_OBJECT_LINEAR: |
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| 288 | texcoord[0] = DOT4(vObj, texUnit->GenS.ObjectPlane); |
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| 289 | break; |
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| 290 | case GL_EYE_LINEAR: |
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| 291 | texcoord[0] = DOT4(vEye, texUnit->GenS.EyePlane); |
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| 292 | break; |
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| 293 | case GL_SPHERE_MAP: |
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| 294 | texcoord[0] = rx * mInv + 0.5F; |
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| 295 | break; |
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| 296 | case GL_REFLECTION_MAP: |
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| 297 | texcoord[0] = rx; |
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| 298 | break; |
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| 299 | case GL_NORMAL_MAP: |
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| 300 | texcoord[0] = normal[0]; |
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| 301 | break; |
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| 302 | default: |
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| 303 | _mesa_problem(ctx, "Bad S texgen in compute_texgen()"); |
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| 304 | return; |
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| 305 | } |
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| 306 | } |
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| 307 | |||
| 308 | if (texUnit->TexGenEnabled & T_BIT) { |
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| 309 | switch (texUnit->GenT.Mode) { |
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| 310 | case GL_OBJECT_LINEAR: |
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| 311 | texcoord[1] = DOT4(vObj, texUnit->GenT.ObjectPlane); |
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| 312 | break; |
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| 313 | case GL_EYE_LINEAR: |
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| 314 | texcoord[1] = DOT4(vEye, texUnit->GenT.EyePlane); |
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| 315 | break; |
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| 316 | case GL_SPHERE_MAP: |
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| 317 | texcoord[1] = ry * mInv + 0.5F; |
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| 318 | break; |
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| 319 | case GL_REFLECTION_MAP: |
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| 320 | texcoord[1] = ry; |
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| 321 | break; |
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| 322 | case GL_NORMAL_MAP: |
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| 323 | texcoord[1] = normal[1]; |
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| 324 | break; |
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| 325 | default: |
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| 326 | _mesa_problem(ctx, "Bad T texgen in compute_texgen()"); |
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| 327 | return; |
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| 328 | } |
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| 329 | } |
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| 330 | |||
| 331 | if (texUnit->TexGenEnabled & R_BIT) { |
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| 332 | switch (texUnit->GenR.Mode) { |
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| 333 | case GL_OBJECT_LINEAR: |
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| 334 | texcoord[2] = DOT4(vObj, texUnit->GenR.ObjectPlane); |
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| 335 | break; |
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| 336 | case GL_EYE_LINEAR: |
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| 337 | texcoord[2] = DOT4(vEye, texUnit->GenR.EyePlane); |
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| 338 | break; |
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| 339 | case GL_REFLECTION_MAP: |
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| 340 | texcoord[2] = rz; |
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| 341 | break; |
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| 342 | case GL_NORMAL_MAP: |
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| 343 | texcoord[2] = normal[2]; |
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| 344 | break; |
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| 345 | default: |
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| 346 | _mesa_problem(ctx, "Bad R texgen in compute_texgen()"); |
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| 347 | return; |
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| 348 | } |
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| 349 | } |
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| 350 | |||
| 351 | if (texUnit->TexGenEnabled & Q_BIT) { |
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| 352 | switch (texUnit->GenQ.Mode) { |
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| 353 | case GL_OBJECT_LINEAR: |
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| 354 | texcoord[3] = DOT4(vObj, texUnit->GenQ.ObjectPlane); |
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| 355 | break; |
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| 356 | case GL_EYE_LINEAR: |
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| 357 | texcoord[3] = DOT4(vEye, texUnit->GenQ.EyePlane); |
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| 358 | break; |
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| 359 | default: |
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| 360 | _mesa_problem(ctx, "Bad Q texgen in compute_texgen()"); |
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| 361 | return; |
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| 362 | } |
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| 363 | } |
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| 364 | } |
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| 365 | |||
| 366 | |||
| 367 | /** |
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| 368 | * glRasterPos transformation. Typically called via ctx->Driver.RasterPos(). |
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| 369 | * XXX some of this code (such as viewport xform, clip testing and setting |
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| 370 | * of ctx->Current.Raster* fields) could get lifted up into the |
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| 371 | * main/rasterpos.c code. |
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| 372 | * |
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| 373 | * \param vObj vertex position in object space |
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| 374 | */ |
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| 375 | void |
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| 376 | _tnl_RasterPos(struct gl_context *ctx, const GLfloat vObj[4]) |
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| 377 | { |
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| 378 | if (ctx->VertexProgram._Enabled) { |
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| 379 | /* XXX implement this */ |
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| 380 | _mesa_problem(ctx, "Vertex programs not implemented for glRasterPos"); |
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| 381 | return; |
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| 382 | } |
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| 383 | else { |
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| 384 | GLfloat eye[4], clip[4], ndc[3], d; |
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| 385 | GLfloat *norm, eyenorm[3]; |
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| 386 | GLfloat *objnorm = ctx->Current.Attrib[VERT_ATTRIB_NORMAL]; |
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| 387 | |||
| 388 | /* apply modelview matrix: eye = MV * obj */ |
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| 389 | TRANSFORM_POINT( eye, ctx->ModelviewMatrixStack.Top->m, vObj ); |
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| 390 | /* apply projection matrix: clip = Proj * eye */ |
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| 391 | TRANSFORM_POINT( clip, ctx->ProjectionMatrixStack.Top->m, eye ); |
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| 392 | |||
| 393 | /* clip to view volume. */ |
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| 394 | if (!ctx->Transform.DepthClamp) { |
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| 395 | if (viewclip_point_z(clip) == 0) { |
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| 396 | ctx->Current.RasterPosValid = GL_FALSE; |
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| 397 | return; |
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| 398 | } |
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| 399 | } |
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| 400 | if (!ctx->Transform.RasterPositionUnclipped) { |
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| 401 | if (viewclip_point_xy(clip) == 0) { |
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| 402 | ctx->Current.RasterPosValid = GL_FALSE; |
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| 403 | return; |
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| 404 | } |
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| 405 | } |
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| 406 | |||
| 407 | /* clip to user clipping planes */ |
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| 408 | if (ctx->Transform.ClipPlanesEnabled && !userclip_point(ctx, clip)) { |
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| 409 | ctx->Current.RasterPosValid = GL_FALSE; |
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| 410 | return; |
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| 411 | } |
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| 412 | |||
| 413 | /* ndc = clip / W */ |
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| 414 | d = (clip[3] == 0.0F) ? 1.0F : 1.0F / clip[3]; |
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| 415 | ndc[0] = clip[0] * d; |
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| 416 | ndc[1] = clip[1] * d; |
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| 417 | ndc[2] = clip[2] * d; |
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| 418 | /* wincoord = viewport_mapping(ndc) */ |
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| 419 | ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX] |
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| 420 | + ctx->Viewport._WindowMap.m[MAT_TX]); |
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| 421 | ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY] |
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| 422 | + ctx->Viewport._WindowMap.m[MAT_TY]); |
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| 423 | ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ] |
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| 424 | + ctx->Viewport._WindowMap.m[MAT_TZ]) |
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| 425 | / ctx->DrawBuffer->_DepthMaxF; |
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| 426 | ctx->Current.RasterPos[3] = clip[3]; |
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| 427 | |||
| 428 | if (ctx->Transform.DepthClamp) { |
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| 429 | ctx->Current.RasterPos[3] = CLAMP(ctx->Current.RasterPos[3], |
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| 430 | ctx->Viewport.Near, |
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| 431 | ctx->Viewport.Far); |
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| 432 | } |
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| 433 | |||
| 434 | /* compute raster distance */ |
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| 435 | if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT) |
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| 436 | ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0]; |
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| 437 | else |
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| 438 | ctx->Current.RasterDistance = |
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| 439 | SQRTF( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] ); |
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| 440 | |||
| 441 | /* compute transformed normal vector (for lighting or texgen) */ |
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| 442 | if (ctx->_NeedEyeCoords) { |
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| 443 | const GLfloat *inv = ctx->ModelviewMatrixStack.Top->inv; |
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| 444 | TRANSFORM_NORMAL( eyenorm, objnorm, inv ); |
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| 445 | norm = eyenorm; |
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| 446 | } |
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| 447 | else { |
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| 448 | norm = objnorm; |
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| 449 | } |
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| 450 | |||
| 451 | /* update raster color */ |
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| 452 | if (ctx->Light.Enabled) { |
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| 453 | /* lighting */ |
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| 454 | shade_rastpos( ctx, vObj, norm, |
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| 455 | ctx->Current.RasterColor, |
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| 456 | ctx->Current.RasterSecondaryColor ); |
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| 457 | } |
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| 458 | else { |
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| 459 | /* use current color */ |
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| 460 | COPY_4FV(ctx->Current.RasterColor, |
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| 461 | ctx->Current.Attrib[VERT_ATTRIB_COLOR0]); |
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| 462 | COPY_4FV(ctx->Current.RasterSecondaryColor, |
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| 463 | ctx->Current.Attrib[VERT_ATTRIB_COLOR1]); |
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| 464 | } |
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| 465 | |||
| 466 | /* texture coords */ |
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| 467 | { |
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| 468 | GLuint u; |
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| 469 | for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) { |
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| 470 | GLfloat tc[4]; |
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| 471 | COPY_4V(tc, ctx->Current.Attrib[VERT_ATTRIB_TEX0 + u]); |
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| 472 | if (ctx->Texture.Unit[u].TexGenEnabled) { |
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| 473 | compute_texgen(ctx, vObj, eye, norm, u, tc); |
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| 474 | } |
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| 475 | TRANSFORM_POINT(ctx->Current.RasterTexCoords[u], |
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| 476 | ctx->TextureMatrixStack[u].Top->m, tc); |
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| 477 | } |
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| 478 | } |
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| 479 | |||
| 480 | ctx->Current.RasterPosValid = GL_TRUE; |
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| 481 | } |
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| 482 | |||
| 483 | if (ctx->RenderMode == GL_SELECT) { |
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| 484 | _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] ); |
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| 485 | } |
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| 486 | } |