src/mesa/vbo/vbo_exec_eval.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Keith Whitwell <keith@tungstengraphics.com>
  27  */
  28
  29 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/macros.h"
  32 #include "math/m_eval.h"
  33 #include "main/dispatch.h"
  34 #include "vbo_exec.h"
  35
  36
  37 static void clear_active_eval1( struct vbo_exec_context *exec, GLuint attr )
  38 {
  39    assert(attr < Elements(exec->eval.map1));
  40    exec->eval.map1[attr].map = NULL;
  41 }
  42
  43 static void clear_active_eval2( struct vbo_exec_context *exec, GLuint attr )
  44 {
  45    assert(attr < Elements(exec->eval.map2));
  46    exec->eval.map2[attr].map = NULL;
  47 }
  48
  49 static void set_active_eval1( struct vbo_exec_context *exec, GLuint attr, GLuint dim,
  50                               struct gl_1d_map *map )
  51 {
  52    assert(attr < Elements(exec->eval.map1));
  53    if (!exec->eval.map1[attr].map) {
  54       exec->eval.map1[attr].map = map;
  55       exec->eval.map1[attr].sz = dim;
  56    }
  57 }
  58
  59 static void set_active_eval2( struct vbo_exec_context *exec, GLuint attr, GLuint dim,
  60                               struct gl_2d_map *map )
  61 {
  62    assert(attr < Elements(exec->eval.map2));
  63    if (!exec->eval.map2[attr].map) {
  64       exec->eval.map2[attr].map = map;
  65       exec->eval.map2[attr].sz = dim;
  66    }
  67 }
  68
  69 void vbo_exec_eval_update( struct vbo_exec_context *exec )
  70 {
  71    struct gl_context *ctx = exec->ctx;
  72    GLuint attr;
  73
  74    /* Vertex program maps have priority over conventional attribs */
  75
  76    for (attr = 0; attr < VBO_ATTRIB_FIRST_MATERIAL; attr++) {
  77       clear_active_eval1( exec, attr );
  78       clear_active_eval2( exec, attr );
  79    }
  80
  81    if (ctx->Eval.Map1Color4)
  82       set_active_eval1( exec, VBO_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map1Color4 );
  83
  84    if (ctx->Eval.Map2Color4)
  85       set_active_eval2( exec, VBO_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map2Color4 );
  86
  87    if (ctx->Eval.Map1TextureCoord4)
  88       set_active_eval1( exec, VBO_ATTRIB_TEX0, 4, &ctx->EvalMap.Map1Texture4 );
  89    else if (ctx->Eval.Map1TextureCoord3)
  90       set_active_eval1( exec, VBO_ATTRIB_TEX0, 3, &ctx->EvalMap.Map1Texture3 );
  91    else if (ctx->Eval.Map1TextureCoord2)
  92       set_active_eval1( exec, VBO_ATTRIB_TEX0, 2, &ctx->EvalMap.Map1Texture2 );
  93    else if (ctx->Eval.Map1TextureCoord1)
  94       set_active_eval1( exec, VBO_ATTRIB_TEX0, 1, &ctx->EvalMap.Map1Texture1 );
  95
  96    if (ctx->Eval.Map2TextureCoord4)
  97       set_active_eval2( exec, VBO_ATTRIB_TEX0, 4, &ctx->EvalMap.Map2Texture4 );
  98    else if (ctx->Eval.Map2TextureCoord3)
  99       set_active_eval2( exec, VBO_ATTRIB_TEX0, 3, &ctx->EvalMap.Map2Texture3 );
 100    else if (ctx->Eval.Map2TextureCoord2)
 101       set_active_eval2( exec, VBO_ATTRIB_TEX0, 2, &ctx->EvalMap.Map2Texture2 );
 102    else if (ctx->Eval.Map2TextureCoord1)
 103       set_active_eval2( exec, VBO_ATTRIB_TEX0, 1, &ctx->EvalMap.Map2Texture1 );
 104
 105    if (ctx->Eval.Map1Normal)
 106       set_active_eval1( exec, VBO_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map1Normal );
 107
 108    if (ctx->Eval.Map2Normal)
 109       set_active_eval2( exec, VBO_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map2Normal );
 110
 111    if (ctx->Eval.Map1Vertex4)
 112       set_active_eval1( exec, VBO_ATTRIB_POS, 4, &ctx->EvalMap.Map1Vertex4 );
 113    else if (ctx->Eval.Map1Vertex3)
 114       set_active_eval1( exec, VBO_ATTRIB_POS, 3, &ctx->EvalMap.Map1Vertex3 );
 115
 116    if (ctx->Eval.Map2Vertex4)
 117       set_active_eval2( exec, VBO_ATTRIB_POS, 4, &ctx->EvalMap.Map2Vertex4 );
 118    else if (ctx->Eval.Map2Vertex3)
 119       set_active_eval2( exec, VBO_ATTRIB_POS, 3, &ctx->EvalMap.Map2Vertex3 );
 120
 121    exec->eval.recalculate_maps = 0;
 122 }
 123
 124
 125
 126 void vbo_exec_do_EvalCoord1f(struct vbo_exec_context *exec, GLfloat u)
 127 {
 128    GLuint attr;
 129
 130    for (attr = 1; attr <= VBO_ATTRIB_TEX7; attr++) {
 131       struct gl_1d_map *map = exec->eval.map1[attr].map;
 132       if (map) {
 133          GLfloat uu = (u - map->u1) * map->du;
 134          GLfloat data[4];
 135
 136          ASSIGN_4V(data, 0, 0, 0, 1);
 137
 138          _math_horner_bezier_curve(map->Points, data, uu,
 139                                    exec->eval.map1[attr].sz,
 140                                    map->Order);
 141
 142          COPY_SZ_4V( exec->vtx.attrptr[attr],
 143                      exec->vtx.attrsz[attr],
 144                      data );
 145       }
 146    }
 147
 148    /** Vertex -- EvalCoord1f is a noop if this map not enabled:
 149     **/
 150    if (exec->eval.map1[0].map) {
 151       struct gl_1d_map *map = exec->eval.map1[0].map;
 152       GLfloat uu = (u - map->u1) * map->du;
 153       GLfloat vertex[4];
 154
 155       ASSIGN_4V(vertex, 0, 0, 0, 1);
 156
 157       _math_horner_bezier_curve(map->Points, vertex, uu,
 158                                 exec->eval.map1[0].sz,
 159                                 map->Order);
 160
 161       if (exec->eval.map1[0].sz == 4)
 162          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 163       else
 164          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 165    }
 166 }
 167
 168
 169
 170 void vbo_exec_do_EvalCoord2f( struct vbo_exec_context *exec,
 171                               GLfloat u, GLfloat v )
 172 {
 173    GLuint attr;
 174
 175    for (attr = 1; attr <= VBO_ATTRIB_TEX7; attr++) {
 176       struct gl_2d_map *map = exec->eval.map2[attr].map;
 177       if (map) {
 178          GLfloat uu = (u - map->u1) * map->du;
 179          GLfloat vv = (v - map->v1) * map->dv;
 180          GLfloat data[4];
 181
 182          ASSIGN_4V(data, 0, 0, 0, 1);
 183
 184          _math_horner_bezier_surf(map->Points,
 185                                   data,
 186                                   uu, vv,
 187                                   exec->eval.map2[attr].sz,
 188                                   map->Uorder, map->Vorder);
 189
 190          COPY_SZ_4V( exec->vtx.attrptr[attr],
 191                      exec->vtx.attrsz[attr],
 192                      data );
 193       }
 194    }
 195
 196    /** Vertex -- EvalCoord2f is a noop if this map not enabled:
 197     **/
 198    if (exec->eval.map2[0].map) {
 199       struct gl_2d_map *map = exec->eval.map2[0].map;
 200       GLfloat uu = (u - map->u1) * map->du;
 201       GLfloat vv = (v - map->v1) * map->dv;
 202       GLfloat vertex[4];
 203
 204       ASSIGN_4V(vertex, 0, 0, 0, 1);
 205
 206       if (exec->ctx->Eval.AutoNormal) {
 207          GLfloat normal[4];
 208          GLfloat du[4], dv[4];
 209
 210          _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv,
 211                                  exec->eval.map2[0].sz,
 212                                  map->Uorder, map->Vorder);
 213
 214          if (exec->eval.map2[0].sz == 4) {
 215             du[0] = du[0]*vertex[3] - du[3]*vertex[0];
 216             du[1] = du[1]*vertex[3] - du[3]*vertex[1];
 217             du[2] = du[2]*vertex[3] - du[3]*vertex[2];
 218
 219             dv[0] = dv[0]*vertex[3] - dv[3]*vertex[0];
 220             dv[1] = dv[1]*vertex[3] - dv[3]*vertex[1];
 221             dv[2] = dv[2]*vertex[3] - dv[3]*vertex[2];
 222          }
 223
 224
 225          CROSS3(normal, du, dv);
 226          NORMALIZE_3FV(normal);
 227          normal[3] = 1.0;
 228
 229          COPY_SZ_4V( exec->vtx.attrptr[VBO_ATTRIB_NORMAL],
 230                      exec->vtx.attrsz[VBO_ATTRIB_NORMAL],
 231                      normal );
 232
 233       }
 234       else {
 235          _math_horner_bezier_surf(map->Points, vertex, uu, vv,
 236                                   exec->eval.map2[0].sz,
 237                                   map->Uorder, map->Vorder);
 238       }
 239
 240       if (exec->vtx.attrsz[0] == 4)
 241          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 242       else
 243          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 244    }
 245 }
 246
 247