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| Rev | Author | Line No. | Line |
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| 55 | pj | 1 | /* $Id: api_eval.c,v 1.1 2003-02-28 11:41:57 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 3.5 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2001 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | * Authors: |
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| 27 | * Keith Whitwell <keith@tungstengraphics.com> |
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| 28 | */ |
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| 29 | |||
| 30 | #include "glheader.h" |
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| 31 | #include "api_eval.h" |
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| 32 | #include "context.h" |
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| 33 | #include "macros.h" |
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| 34 | #include "mmath.h" |
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| 35 | #include "math/m_eval.h" |
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| 36 | |||
| 37 | static void do_EvalCoord1f(GLcontext* ctx, GLfloat u) |
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| 38 | { |
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| 39 | |||
| 40 | /** Color Index **/ |
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| 41 | if (ctx->Eval.Map1Index) |
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| 42 | { |
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| 43 | GLfloat findex; |
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| 44 | struct gl_1d_map *map = &ctx->EvalMap.Map1Index; |
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| 45 | GLfloat uu = (u - map->u1) * map->du; |
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| 46 | _math_horner_bezier_curve(map->Points, &findex, uu, 1, map->Order); |
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| 47 | glIndexi( (GLint) findex ); |
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| 48 | } |
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| 49 | |||
| 50 | /** Color **/ |
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| 51 | if (ctx->Eval.Map1Color4) { |
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| 52 | GLfloat fcolor[4]; |
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| 53 | struct gl_1d_map *map = &ctx->EvalMap.Map1Color4; |
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| 54 | GLfloat uu = (u - map->u1) * map->du; |
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| 55 | _math_horner_bezier_curve(map->Points, fcolor, uu, 4, map->Order); |
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| 56 | glColor4fv( fcolor ); |
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| 57 | } |
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| 58 | |||
| 59 | /** Normal Vector **/ |
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| 60 | if (ctx->Eval.Map1Normal) { |
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| 61 | GLfloat normal[3]; |
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| 62 | struct gl_1d_map *map = &ctx->EvalMap.Map1Normal; |
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| 63 | GLfloat uu = (u - map->u1) * map->du; |
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| 64 | _math_horner_bezier_curve(map->Points, normal, uu, 3, map->Order); |
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| 65 | glNormal3fv( normal ); |
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| 66 | } |
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| 67 | |||
| 68 | /** Texture Coordinates **/ |
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| 69 | if (ctx->Eval.Map1TextureCoord4) { |
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| 70 | GLfloat texcoord[4]; |
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| 71 | struct gl_1d_map *map = &ctx->EvalMap.Map1Texture4; |
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| 72 | GLfloat uu = (u - map->u1) * map->du; |
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| 73 | _math_horner_bezier_curve(map->Points, texcoord, uu, 4, map->Order); |
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| 74 | glTexCoord4fv( texcoord ); |
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| 75 | } |
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| 76 | else if (ctx->Eval.Map1TextureCoord3) { |
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| 77 | GLfloat texcoord[4]; |
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| 78 | struct gl_1d_map *map = &ctx->EvalMap.Map1Texture3; |
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| 79 | GLfloat uu = (u - map->u1) * map->du; |
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| 80 | _math_horner_bezier_curve(map->Points, texcoord, uu, 3, map->Order); |
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| 81 | glTexCoord3fv( texcoord ); |
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| 82 | } |
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| 83 | else if (ctx->Eval.Map1TextureCoord2) { |
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| 84 | GLfloat texcoord[4]; |
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| 85 | struct gl_1d_map *map = &ctx->EvalMap.Map1Texture2; |
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| 86 | GLfloat uu = (u - map->u1) * map->du; |
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| 87 | _math_horner_bezier_curve(map->Points, texcoord, uu, 2, map->Order); |
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| 88 | glTexCoord2fv( texcoord ); |
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| 89 | } |
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| 90 | else if (ctx->Eval.Map1TextureCoord1) { |
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| 91 | GLfloat texcoord[4]; |
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| 92 | struct gl_1d_map *map = &ctx->EvalMap.Map1Texture1; |
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| 93 | GLfloat uu = (u - map->u1) * map->du; |
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| 94 | _math_horner_bezier_curve(map->Points, texcoord, uu, 1, map->Order); |
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| 95 | glTexCoord1fv( texcoord ); |
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| 96 | } |
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| 97 | |||
| 98 | /** Vertex **/ |
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| 99 | if (ctx->Eval.Map1Vertex4) |
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| 100 | { |
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| 101 | GLfloat vertex[4]; |
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| 102 | struct gl_1d_map *map = &ctx->EvalMap.Map1Vertex4; |
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| 103 | GLfloat uu = (u - map->u1) * map->du; |
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| 104 | _math_horner_bezier_curve(map->Points, vertex, uu, 4, map->Order); |
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| 105 | glVertex4fv( vertex ); |
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| 106 | } |
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| 107 | else if (ctx->Eval.Map1Vertex3) |
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| 108 | { |
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| 109 | GLfloat vertex[4]; |
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| 110 | struct gl_1d_map *map = &ctx->EvalMap.Map1Vertex3; |
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| 111 | GLfloat uu = (u - map->u1) * map->du; |
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| 112 | _math_horner_bezier_curve(map->Points, vertex, uu, 3, map->Order); |
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| 113 | glVertex3fv( vertex ); |
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| 114 | } |
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| 115 | } |
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| 116 | |||
| 117 | #define CROSS_PROD(n, u, v) \ |
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| 118 | (n)[0] = (u)[1]*(v)[2] - (u)[2]*(v)[1]; \ |
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| 119 | (n)[1] = (u)[2]*(v)[0] - (u)[0]*(v)[2]; \ |
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| 120 | (n)[2] = (u)[0]*(v)[1] - (u)[1]*(v)[0] |
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| 121 | |||
| 122 | |||
| 123 | static void do_EvalCoord2f( GLcontext* ctx, GLfloat u, GLfloat v ) |
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| 124 | { |
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| 125 | /** Color Index **/ |
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| 126 | if (ctx->Eval.Map2Index) { |
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| 127 | GLfloat findex; |
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| 128 | struct gl_2d_map *map = &ctx->EvalMap.Map2Index; |
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| 129 | GLfloat uu = (u - map->u1) * map->du; |
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| 130 | GLfloat vv = (v - map->v1) * map->dv; |
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| 131 | _math_horner_bezier_surf(map->Points, &findex, uu, vv, 1, |
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| 132 | map->Uorder, map->Vorder); |
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| 133 | glIndexi( (GLuint) (GLint) findex ); |
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| 134 | } |
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| 135 | |||
| 136 | /** Color **/ |
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| 137 | if (ctx->Eval.Map2Color4) { |
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| 138 | GLfloat fcolor[4]; |
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| 139 | struct gl_2d_map *map = &ctx->EvalMap.Map2Color4; |
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| 140 | GLfloat uu = (u - map->u1) * map->du; |
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| 141 | GLfloat vv = (v - map->v1) * map->dv; |
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| 142 | _math_horner_bezier_surf(map->Points, fcolor, uu, vv, 4, |
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| 143 | map->Uorder, map->Vorder); |
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| 144 | glColor4fv( fcolor ); |
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| 145 | } |
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| 146 | |||
| 147 | /** Normal **/ |
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| 148 | if (ctx->Eval.Map2Normal && |
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| 149 | (!ctx->Eval.AutoNormal || (!ctx->Eval.Map2Vertex3 && |
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| 150 | !ctx->Eval.Map2Vertex4))) { |
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| 151 | GLfloat normal[3]; |
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| 152 | struct gl_2d_map *map = &ctx->EvalMap.Map2Normal; |
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| 153 | GLfloat uu = (u - map->u1) * map->du; |
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| 154 | GLfloat vv = (v - map->v1) * map->dv; |
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| 155 | _math_horner_bezier_surf(map->Points, normal, uu, vv, 3, |
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| 156 | map->Uorder, map->Vorder); |
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| 157 | glNormal3fv( normal ); |
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| 158 | } |
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| 159 | |||
| 160 | /** Texture Coordinates **/ |
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| 161 | if (ctx->Eval.Map2TextureCoord4) { |
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| 162 | GLfloat texcoord[4]; |
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| 163 | struct gl_2d_map *map = &ctx->EvalMap.Map2Texture4; |
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| 164 | GLfloat uu = (u - map->u1) * map->du; |
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| 165 | GLfloat vv = (v - map->v1) * map->dv; |
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| 166 | _math_horner_bezier_surf(map->Points, texcoord, uu, vv, 4, |
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| 167 | map->Uorder, map->Vorder); |
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| 168 | glTexCoord4fv( texcoord ); |
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| 169 | } |
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| 170 | else if (ctx->Eval.Map2TextureCoord3) { |
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| 171 | GLfloat texcoord[4]; |
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| 172 | struct gl_2d_map *map = &ctx->EvalMap.Map2Texture3; |
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| 173 | GLfloat uu = (u - map->u1) * map->du; |
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| 174 | GLfloat vv = (v - map->v1) * map->dv; |
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| 175 | _math_horner_bezier_surf(map->Points, texcoord, uu, vv, 3, |
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| 176 | map->Uorder, map->Vorder); |
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| 177 | glTexCoord3fv( texcoord ); |
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| 178 | } |
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| 179 | else if (ctx->Eval.Map2TextureCoord2) { |
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| 180 | GLfloat texcoord[4]; |
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| 181 | struct gl_2d_map *map = &ctx->EvalMap.Map2Texture2; |
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| 182 | GLfloat uu = (u - map->u1) * map->du; |
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| 183 | GLfloat vv = (v - map->v1) * map->dv; |
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| 184 | _math_horner_bezier_surf(map->Points, texcoord, uu, vv, 2, |
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| 185 | map->Uorder, map->Vorder); |
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| 186 | glTexCoord2fv( texcoord ); |
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| 187 | } |
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| 188 | else if (ctx->Eval.Map2TextureCoord1) { |
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| 189 | GLfloat texcoord[4]; |
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| 190 | struct gl_2d_map *map = &ctx->EvalMap.Map2Texture1; |
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| 191 | GLfloat uu = (u - map->u1) * map->du; |
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| 192 | GLfloat vv = (v - map->v1) * map->dv; |
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| 193 | _math_horner_bezier_surf(map->Points, texcoord, uu, vv, 1, |
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| 194 | map->Uorder, map->Vorder); |
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| 195 | glTexCoord1fv( texcoord ); |
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| 196 | } |
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| 197 | |||
| 198 | /** Vertex **/ |
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| 199 | if(ctx->Eval.Map2Vertex4) { |
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| 200 | GLfloat vertex[4]; |
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| 201 | GLfloat normal[3]; |
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| 202 | struct gl_2d_map *map = &ctx->EvalMap.Map2Vertex4; |
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| 203 | GLfloat uu = (u - map->u1) * map->du; |
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| 204 | GLfloat vv = (v - map->v1) * map->dv; |
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| 205 | |||
| 206 | if (ctx->Eval.AutoNormal) { |
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| 207 | GLfloat du[4], dv[4]; |
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| 208 | |||
| 209 | _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv, 4, |
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| 210 | map->Uorder, map->Vorder); |
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| 211 | |||
| 212 | CROSS_PROD(normal, du, dv); |
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| 213 | NORMALIZE_3FV(normal); |
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| 214 | } |
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| 215 | else { |
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| 216 | _math_horner_bezier_surf(map->Points, vertex, uu, vv, 4, |
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| 217 | map->Uorder, map->Vorder); |
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| 218 | } |
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| 219 | } |
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| 220 | else if (ctx->Eval.Map2Vertex3) { |
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| 221 | GLfloat vertex[4]; |
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| 222 | struct gl_2d_map *map = &ctx->EvalMap.Map2Vertex3; |
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| 223 | GLfloat uu = (u - map->u1) * map->du; |
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| 224 | GLfloat vv = (v - map->v1) * map->dv; |
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| 225 | if (ctx->Eval.AutoNormal) { |
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| 226 | GLfloat du[3], dv[3]; |
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| 227 | GLfloat normal[3]; |
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| 228 | _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv, 3, |
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| 229 | map->Uorder, map->Vorder); |
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| 230 | CROSS_PROD(normal, du, dv); |
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| 231 | NORMALIZE_3FV(normal); |
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| 232 | glNormal3fv( normal ); |
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| 233 | glVertex3fv( vertex ); |
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| 234 | } |
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| 235 | else { |
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| 236 | _math_horner_bezier_surf(map->Points, vertex, uu, vv, 3, |
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| 237 | map->Uorder, map->Vorder); |
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| 238 | glVertex3fv( vertex ); |
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| 239 | } |
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| 240 | } |
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| 241 | } |
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| 242 | |||
| 243 | |||
| 244 | void _mesa_EvalPoint1( GLint i ) |
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| 245 | { |
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| 246 | GET_CURRENT_CONTEXT( ctx ); |
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| 247 | GLfloat du = ((ctx->Eval.MapGrid1u2 - ctx->Eval.MapGrid1u1) / |
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| 248 | (GLfloat) ctx->Eval.MapGrid1un); |
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| 249 | GLfloat u = i * du + ctx->Eval.MapGrid1u1; |
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| 250 | |||
| 251 | glEvalCoord1f( u ); |
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| 252 | } |
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| 253 | |||
| 254 | |||
| 255 | void _mesa_EvalPoint2( GLint i, GLint j ) |
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| 256 | { |
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| 257 | GET_CURRENT_CONTEXT( ctx ); |
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| 258 | GLfloat du = ((ctx->Eval.MapGrid2u2 - ctx->Eval.MapGrid2u1) / |
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| 259 | (GLfloat) ctx->Eval.MapGrid2un); |
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| 260 | GLfloat dv = ((ctx->Eval.MapGrid2v2 - ctx->Eval.MapGrid2v1) / |
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| 261 | (GLfloat) ctx->Eval.MapGrid2vn); |
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| 262 | GLfloat u = i * du + ctx->Eval.MapGrid2u1; |
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| 263 | GLfloat v = j * dv + ctx->Eval.MapGrid2v1; |
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| 264 | |||
| 265 | glEvalCoord2f( u, v ); |
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| 266 | } |
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| 267 | |||
| 268 | /* Wierd thing about eval is that it doesn't affect 'current' values. |
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| 269 | * This technique of saving and resetting current values requires |
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| 270 | * that: |
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| 271 | * |
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| 272 | * 1) Current values are updated immediately in the glColor, |
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| 273 | * etc. functions. |
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| 274 | * |
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| 275 | * 2) Hardware color values are stored seperately from ctx->Current, |
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| 276 | * for example in dma buffers, or direct emit to registers. |
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| 277 | */ |
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| 278 | void _mesa_EvalCoord1f( GLfloat u ) |
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| 279 | { |
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| 280 | GET_CURRENT_CONTEXT( ctx ); |
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| 281 | GLfloat normal[3], texcoord[4], color[4]; |
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| 282 | GLuint index; |
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| 283 | |||
| 284 | COPY_3FV( normal, ctx->Current.Attrib[VERT_ATTRIB_NORMAL] ); |
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| 285 | COPY_4FV( texcoord, ctx->Current.Attrib[VERT_ATTRIB_TEX0] ); |
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| 286 | COPY_4FV( color, ctx->Current.Attrib[VERT_ATTRIB_COLOR0] ); |
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| 287 | index = ctx->Current.Index; |
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| 288 | |||
| 289 | do_EvalCoord1f( ctx, u ); |
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| 290 | |||
| 291 | COPY_3FV( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], normal ); |
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| 292 | COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_TEX0], texcoord ); |
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| 293 | COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color ); |
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| 294 | ctx->Current.Index = index; |
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| 295 | } |
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| 296 | |||
| 297 | void _mesa_EvalCoord2f( GLfloat u, GLfloat v ) |
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| 298 | { |
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| 299 | GET_CURRENT_CONTEXT( ctx ); |
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| 300 | GLfloat normal[3], texcoord[4], color[4]; |
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| 301 | GLuint index; |
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| 302 | |||
| 303 | COPY_3FV( normal, ctx->Current.Attrib[VERT_ATTRIB_NORMAL] ); |
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| 304 | COPY_4FV( texcoord, ctx->Current.Attrib[VERT_ATTRIB_TEX0] ); |
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| 305 | COPY_4FV( color, ctx->Current.Attrib[VERT_ATTRIB_COLOR0] ); |
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| 306 | index = ctx->Current.Index; |
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| 307 | |||
| 308 | do_EvalCoord2f( ctx, u, v ); |
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| 309 | |||
| 310 | COPY_3FV( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], normal ); |
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| 311 | COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_TEX0], texcoord ); |
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| 312 | COPY_4FV( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], color ); |
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| 313 | ctx->Current.Index = index; |
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| 314 | } |
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| 315 | |||
| 316 | void _mesa_EvalCoord1fv( const GLfloat *u ) |
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| 317 | { |
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| 318 | glEvalCoord1f( u[0] ); |
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| 319 | } |
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| 320 | |||
| 321 | void _mesa_EvalCoord2fv( const GLfloat *u ) |
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| 322 | { |
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| 323 | glEvalCoord2f( u[0], u[1] ); |
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| 324 | } |