src/mesa/tnl/t_vtx_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 "glheader.h"
  29 #include "api_eval.h"
  30 #include "context.h"
  31 #include "macros.h"
  32 #include "math/m_eval.h"
  33 #include "t_vtx_api.h"
  34 #include "dispatch.h"
  35
  36
  37 static void clear_active_eval1( TNLcontext *tnl, GLuint attr )
  38 {
  39    tnl->vtx.eval.map1[attr].map = NULL;
  40 }
  41
  42 static void clear_active_eval2( TNLcontext *tnl, GLuint attr )
  43 {
  44    tnl->vtx.eval.map2[attr].map = NULL;
  45 }
  46
  47 static void set_active_eval1( TNLcontext *tnl, GLuint attr, GLuint dim,
  48                               struct gl_1d_map *map )
  49 {
  50    if (!tnl->vtx.eval.map1[attr].map) {
  51       tnl->vtx.eval.map1[attr].map = map;
  52       tnl->vtx.eval.map1[attr].sz = dim;
  53    }
  54 }
  55
  56 static void set_active_eval2( TNLcontext *tnl, GLuint attr, GLuint dim,
  57                               struct gl_2d_map *map )
  58 {
  59    if (!tnl->vtx.eval.map2[attr].map) {
  60       tnl->vtx.eval.map2[attr].map = map;
  61       tnl->vtx.eval.map2[attr].sz = dim;
  62    }
  63 }
  64
  65 void _tnl_update_eval( GLcontext *ctx )
  66 {
  67    TNLcontext *tnl = TNL_CONTEXT(ctx);
  68    GLuint attr;
  69
  70    /* Vertex program maps have priority over conventional attribs */
  71
  72    for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
  73       clear_active_eval1( tnl, attr );
  74       clear_active_eval2( tnl, attr );
  75    }
  76
  77    if (ctx->VertexProgram._Enabled) {
  78       for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
  79          if (ctx->Eval.Map1Attrib[attr])
  80             set_active_eval1( tnl, attr, 4, &ctx->EvalMap.Map1Attrib[attr] );
  81
  82          if (ctx->Eval.Map2Attrib[attr])
  83             set_active_eval2( tnl, attr, 4, &ctx->EvalMap.Map2Attrib[attr] );
  84       }
  85    }
  86
  87    if (ctx->Eval.Map1Color4)
  88       set_active_eval1( tnl, VERT_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map1Color4 );
  89
  90    if (ctx->Eval.Map2Color4)
  91       set_active_eval2( tnl, VERT_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map2Color4 );
  92
  93    if (ctx->Eval.Map1TextureCoord4)
  94       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 4, &ctx->EvalMap.Map1Texture4 );
  95    else if (ctx->Eval.Map1TextureCoord3)
  96       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 3, &ctx->EvalMap.Map1Texture3 );
  97    else if (ctx->Eval.Map1TextureCoord2)
  98       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 2, &ctx->EvalMap.Map1Texture2 );
  99    else if (ctx->Eval.Map1TextureCoord1)
 100       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 1, &ctx->EvalMap.Map1Texture1 );
 101
 102    if (ctx->Eval.Map2TextureCoord4)
 103       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 4, &ctx->EvalMap.Map2Texture4 );
 104    else if (ctx->Eval.Map2TextureCoord3)
 105       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 3, &ctx->EvalMap.Map2Texture3 );
 106    else if (ctx->Eval.Map2TextureCoord2)
 107       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 2, &ctx->EvalMap.Map2Texture2 );
 108    else if (ctx->Eval.Map2TextureCoord1)
 109       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 1, &ctx->EvalMap.Map2Texture1 );
 110
 111    if (ctx->Eval.Map1Normal)
 112       set_active_eval1( tnl, VERT_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map1Normal );
 113
 114    if (ctx->Eval.Map2Normal)
 115       set_active_eval2( tnl, VERT_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map2Normal );
 116
 117    if (ctx->Eval.Map1Vertex4)
 118       set_active_eval1( tnl, VERT_ATTRIB_POS, 4, &ctx->EvalMap.Map1Vertex4 );
 119    else if (ctx->Eval.Map1Vertex3)
 120       set_active_eval1( tnl, VERT_ATTRIB_POS, 3, &ctx->EvalMap.Map1Vertex3 );
 121
 122    if (ctx->Eval.Map2Vertex4)
 123       set_active_eval2( tnl, VERT_ATTRIB_POS, 4, &ctx->EvalMap.Map2Vertex4 );
 124    else if (ctx->Eval.Map2Vertex3)
 125       set_active_eval2( tnl, VERT_ATTRIB_POS, 3, &ctx->EvalMap.Map2Vertex3 );
 126
 127    tnl->vtx.eval.new_state = 0;
 128 }
 129
 130
 131
 132 void _tnl_do_EvalCoord1f(GLcontext* ctx, GLfloat u)
 133 {
 134    TNLcontext *tnl = TNL_CONTEXT(ctx);
 135    GLuint attr;
 136
 137    for (attr = 1; attr <= _TNL_ATTRIB_INDEX; attr++) {
 138       struct gl_1d_map *map = tnl->vtx.eval.map1[attr].map;
 139       if (map) {
 140          GLfloat uu = (u - map->u1) * map->du;
 141          GLfloat data[4];
 142
 143          ASSIGN_4V(data, 0, 0, 0, 1);
 144
 145          _math_horner_bezier_curve(map->Points, data, uu,
 146                                    tnl->vtx.eval.map1[attr].sz,
 147                                    map->Order);
 148
 149          COPY_SZ_4V( tnl->vtx.attrptr[attr],
 150                      tnl->vtx.attrsz[attr],
 151                      data );
 152       }
 153    }
 154
 155    /** Vertex -- EvalCoord1f is a noop if this map not enabled:
 156     **/
 157    if (tnl->vtx.eval.map1[0].map) {
 158       struct gl_1d_map *map = tnl->vtx.eval.map1[0].map;
 159       GLfloat uu = (u - map->u1) * map->du;
 160       GLfloat vertex[4];
 161
 162       ASSIGN_4V(vertex, 0, 0, 0, 1);
 163
 164       _math_horner_bezier_curve(map->Points, vertex, uu,
 165                                 tnl->vtx.eval.map1[0].sz,
 166                                 map->Order);
 167
 168       if (tnl->vtx.eval.map1[0].sz == 4)
 169          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 170       else
 171          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 172    }
 173 }
 174
 175
 176
 177 void _tnl_do_EvalCoord2f( GLcontext* ctx, GLfloat u, GLfloat v )
 178 {
 179    TNLcontext *tnl = TNL_CONTEXT(ctx);
 180    GLuint attr;
 181
 182    for (attr = 1; attr <= _TNL_ATTRIB_INDEX; attr++) {
 183       struct gl_2d_map *map = tnl->vtx.eval.map2[attr].map;
 184       if (map) {
 185          GLfloat uu = (u - map->u1) * map->du;
 186          GLfloat vv = (v - map->v1) * map->dv;
 187          GLfloat data[4];
 188
 189          ASSIGN_4V(data, 0, 0, 0, 1);
 190
 191          _math_horner_bezier_surf(map->Points,
 192                                   data,
 193                                   uu, vv,
 194                                   tnl->vtx.eval.map2[attr].sz,
 195                                   map->Uorder, map->Vorder);
 196
 197          COPY_SZ_4V( tnl->vtx.attrptr[attr],
 198                      tnl->vtx.attrsz[attr],
 199                      data );
 200       }
 201    }
 202
 203    /** Vertex -- EvalCoord2f is a noop if this map not enabled:
 204     **/
 205    if (tnl->vtx.eval.map2[0].map) {
 206       struct gl_2d_map *map = tnl->vtx.eval.map2[0].map;
 207       GLfloat uu = (u - map->u1) * map->du;
 208       GLfloat vv = (v - map->v1) * map->dv;
 209       GLfloat vertex[4];
 210
 211       ASSIGN_4V(vertex, 0, 0, 0, 1);
 212
 213       if (ctx->Eval.AutoNormal) {
 214          GLfloat normal[4];
 215          GLfloat du[4], dv[4];
 216
 217          _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv,
 218                                  tnl->vtx.eval.map2[0].sz,
 219                                  map->Uorder, map->Vorder);
 220
 221          if (tnl->vtx.eval.map2[0].sz == 4) {
 222             du[0] = du[0]*vertex[3] - du[3]*vertex[0];
 223             du[1] = du[1]*vertex[3] - du[3]*vertex[1];
 224             du[2] = du[2]*vertex[3] - du[3]*vertex[2];
 225
 226             dv[0] = dv[0]*vertex[3] - dv[3]*vertex[0];
 227             dv[1] = dv[1]*vertex[3] - dv[3]*vertex[1];
 228             dv[2] = dv[2]*vertex[3] - dv[3]*vertex[2];
 229          }
 230
 231
 232          CROSS3(normal, du, dv);
 233          NORMALIZE_3FV(normal);
 234          normal[3] = 1.0;
 235
 236          COPY_SZ_4V( tnl->vtx.attrptr[_TNL_ATTRIB_NORMAL],
 237                      tnl->vtx.attrsz[_TNL_ATTRIB_NORMAL],
 238                      normal );
 239
 240       }
 241       else {
 242          _math_horner_bezier_surf(map->Points, vertex, uu, vv,
 243                                   tnl->vtx.eval.map2[0].sz,
 244                                   map->Uorder, map->Vorder);
 245       }
 246
 247       if (tnl->vtx.attrsz[0] == 4)
 248          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 249       else
 250          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 251    }
 252 }
 253
 254