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  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/macros.h"
  31 #include "math/m_eval.h"
  32 #include "main/dispatch.h"
  33 #include "vbo_exec.h"
  34
  35
  36 static void clear_active_eval1( struct vbo_exec_context *exec, GLuint attr )
  37 {
  38    assert(attr < Elements(exec->eval.map1));
  39    exec->eval.map1[attr].map = NULL;
  40 }
  41
  42 static void clear_active_eval2( struct vbo_exec_context *exec, GLuint attr )
  43 {
  44    assert(attr < Elements(exec->eval.map2));
  45    exec->eval.map2[attr].map = NULL;
  46 }
  47
  48 static void set_active_eval1( struct vbo_exec_context *exec, GLuint attr, GLuint dim,
  49                               struct gl_1d_map *map )
  50 {
  51    assert(attr < Elements(exec->eval.map1));
  52    if (!exec->eval.map1[attr].map) {
  53       exec->eval.map1[attr].map = map;
  54       exec->eval.map1[attr].sz = dim;
  55    }
  56 }
  57
  58 static void set_active_eval2( struct vbo_exec_context *exec, GLuint attr, GLuint dim,
  59                               struct gl_2d_map *map )
  60 {
  61    assert(attr < Elements(exec->eval.map2));
  62    if (!exec->eval.map2[attr].map) {
  63       exec->eval.map2[attr].map = map;
  64       exec->eval.map2[attr].sz = dim;
  65    }
  66 }
  67
  68 void vbo_exec_eval_update( struct vbo_exec_context *exec )
  69 {
  70    struct gl_context *ctx = exec->ctx;
  71    GLuint attr;
  72
  73    /* Vertex program maps have priority over conventional attribs */
  74
  75    for (attr = 0; attr < VBO_ATTRIB_FIRST_MATERIAL; attr++) {
  76       clear_active_eval1( exec, attr );
  77       clear_active_eval2( exec, attr );
  78    }
  79
  80    if (ctx->Eval.Map1Color4)
  81       set_active_eval1( exec, VBO_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map1Color4 );
  82
  83    if (ctx->Eval.Map2Color4)
  84       set_active_eval2( exec, VBO_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map2Color4 );
  85
  86    if (ctx->Eval.Map1TextureCoord4)
  87       set_active_eval1( exec, VBO_ATTRIB_TEX0, 4, &ctx->EvalMap.Map1Texture4 );
  88    else if (ctx->Eval.Map1TextureCoord3)
  89       set_active_eval1( exec, VBO_ATTRIB_TEX0, 3, &ctx->EvalMap.Map1Texture3 );
  90    else if (ctx->Eval.Map1TextureCoord2)
  91       set_active_eval1( exec, VBO_ATTRIB_TEX0, 2, &ctx->EvalMap.Map1Texture2 );
  92    else if (ctx->Eval.Map1TextureCoord1)
  93       set_active_eval1( exec, VBO_ATTRIB_TEX0, 1, &ctx->EvalMap.Map1Texture1 );
  94
  95    if (ctx->Eval.Map2TextureCoord4)
  96       set_active_eval2( exec, VBO_ATTRIB_TEX0, 4, &ctx->EvalMap.Map2Texture4 );
  97    else if (ctx->Eval.Map2TextureCoord3)
  98       set_active_eval2( exec, VBO_ATTRIB_TEX0, 3, &ctx->EvalMap.Map2Texture3 );
  99    else if (ctx->Eval.Map2TextureCoord2)
 100       set_active_eval2( exec, VBO_ATTRIB_TEX0, 2, &ctx->EvalMap.Map2Texture2 );
 101    else if (ctx->Eval.Map2TextureCoord1)
 102       set_active_eval2( exec, VBO_ATTRIB_TEX0, 1, &ctx->EvalMap.Map2Texture1 );
 103
 104    if (ctx->Eval.Map1Normal)
 105       set_active_eval1( exec, VBO_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map1Normal );
 106
 107    if (ctx->Eval.Map2Normal)
 108       set_active_eval2( exec, VBO_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map2Normal );
 109
 110    if (ctx->Eval.Map1Vertex4)
 111       set_active_eval1( exec, VBO_ATTRIB_POS, 4, &ctx->EvalMap.Map1Vertex4 );
 112    else if (ctx->Eval.Map1Vertex3)
 113       set_active_eval1( exec, VBO_ATTRIB_POS, 3, &ctx->EvalMap.Map1Vertex3 );
 114
 115    if (ctx->Eval.Map2Vertex4)
 116       set_active_eval2( exec, VBO_ATTRIB_POS, 4, &ctx->EvalMap.Map2Vertex4 );
 117    else if (ctx->Eval.Map2Vertex3)
 118       set_active_eval2( exec, VBO_ATTRIB_POS, 3, &ctx->EvalMap.Map2Vertex3 );
 119
 120    /* _NEW_PROGRAM */
 121    if (ctx->VertexProgram._Enabled) {
 122       /* These are the 16 evaluators which GL_NV_vertex_program defines.
 123        * They alias and override the conventional vertex attributs.
 124        */
 125       for (attr = 0; attr < 16; attr++) {
 126          /* _NEW_EVAL */
 127          assert(attr < Elements(ctx->Eval.Map1Attrib));
 128          if (ctx->Eval.Map1Attrib[attr])
 129             set_active_eval1( exec, attr, 4, &ctx->EvalMap.Map1Attrib[attr] );
 130
 131          assert(attr < Elements(ctx->Eval.Map2Attrib));
 132          if (ctx->Eval.Map2Attrib[attr])
 133             set_active_eval2( exec, attr, 4, &ctx->EvalMap.Map2Attrib[attr] );
 134       }
 135    }
 136
 137    exec->eval.recalculate_maps = 0;
 138 }
 139
 140
 141
 142 void vbo_exec_do_EvalCoord1f(struct vbo_exec_context *exec, GLfloat u)
 143 {
 144    GLuint attr;
 145
 146    for (attr = 1; attr <= VBO_ATTRIB_TEX7; attr++) {
 147       struct gl_1d_map *map = exec->eval.map1[attr].map;
 148       if (map) {
 149          GLfloat uu = (u - map->u1) * map->du;
 150          GLfloat data[4];
 151
 152          ASSIGN_4V(data, 0, 0, 0, 1);
 153
 154          _math_horner_bezier_curve(map->Points, data, uu,
 155                                    exec->eval.map1[attr].sz,
 156                                    map->Order);
 157
 158          COPY_SZ_4V( exec->vtx.attrptr[attr],
 159                      exec->vtx.attrsz[attr],
 160                      data );
 161       }
 162    }
 163
 164    /** Vertex -- EvalCoord1f is a noop if this map not enabled:
 165     **/
 166    if (exec->eval.map1[0].map) {
 167       struct gl_1d_map *map = exec->eval.map1[0].map;
 168       GLfloat uu = (u - map->u1) * map->du;
 169       GLfloat vertex[4];
 170
 171       ASSIGN_4V(vertex, 0, 0, 0, 1);
 172
 173       _math_horner_bezier_curve(map->Points, vertex, uu,
 174                                 exec->eval.map1[0].sz,
 175                                 map->Order);
 176
 177       if (exec->eval.map1[0].sz == 4)
 178          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 179       else
 180          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 181    }
 182 }
 183
 184
 185
 186 void vbo_exec_do_EvalCoord2f( struct vbo_exec_context *exec,
 187                               GLfloat u, GLfloat v )
 188 {
 189    GLuint attr;
 190
 191    for (attr = 1; attr <= VBO_ATTRIB_TEX7; attr++) {
 192       struct gl_2d_map *map = exec->eval.map2[attr].map;
 193       if (map) {
 194          GLfloat uu = (u - map->u1) * map->du;
 195          GLfloat vv = (v - map->v1) * map->dv;
 196          GLfloat data[4];
 197
 198          ASSIGN_4V(data, 0, 0, 0, 1);
 199
 200          _math_horner_bezier_surf(map->Points,
 201                                   data,
 202                                   uu, vv,
 203                                   exec->eval.map2[attr].sz,
 204                                   map->Uorder, map->Vorder);
 205
 206          COPY_SZ_4V( exec->vtx.attrptr[attr],
 207                      exec->vtx.attrsz[attr],
 208                      data );
 209       }
 210    }
 211
 212    /** Vertex -- EvalCoord2f is a noop if this map not enabled:
 213     **/
 214    if (exec->eval.map2[0].map) {
 215       struct gl_2d_map *map = exec->eval.map2[0].map;
 216       GLfloat uu = (u - map->u1) * map->du;
 217       GLfloat vv = (v - map->v1) * map->dv;
 218       GLfloat vertex[4];
 219
 220       ASSIGN_4V(vertex, 0, 0, 0, 1);
 221
 222       if (exec->ctx->Eval.AutoNormal) {
 223          GLfloat normal[4];
 224          GLfloat du[4], dv[4];
 225
 226          _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv,
 227                                  exec->eval.map2[0].sz,
 228                                  map->Uorder, map->Vorder);
 229
 230          if (exec->eval.map2[0].sz == 4) {
 231             du[0] = du[0]*vertex[3] - du[3]*vertex[0];
 232             du[1] = du[1]*vertex[3] - du[3]*vertex[1];
 233             du[2] = du[2]*vertex[3] - du[3]*vertex[2];
 234
 235             dv[0] = dv[0]*vertex[3] - dv[3]*vertex[0];
 236             dv[1] = dv[1]*vertex[3] - dv[3]*vertex[1];
 237             dv[2] = dv[2]*vertex[3] - dv[3]*vertex[2];
 238          }
 239
 240
 241          CROSS3(normal, du, dv);
 242          NORMALIZE_3FV(normal);
 243          normal[3] = 1.0;
 244
 245          COPY_SZ_4V( exec->vtx.attrptr[VBO_ATTRIB_NORMAL],
 246                      exec->vtx.attrsz[VBO_ATTRIB_NORMAL],
 247                      normal );
 248
 249       }
 250       else {
 251          _math_horner_bezier_surf(map->Points, vertex, uu, vv,
 252                                   exec->eval.map2[0].sz,
 253                                   map->Uorder, map->Vorder);
 254       }
 255
 256       if (exec->vtx.attrsz[0] == 4)
 257          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 258       else
 259          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 260    }
 261 }
 262
 263