src/mesa/tnl/t_vtx_eval.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  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    ASSERT(attr < _TNL_NUM_EVAL);
  40    tnl->vtx.eval.map1[attr].map = NULL;
  41 }
  42
  43 static void clear_active_eval2( TNLcontext *tnl, GLuint attr )
  44 {
  45    ASSERT(attr < _TNL_NUM_EVAL);
  46    tnl->vtx.eval.map2[attr].map = NULL;
  47 }
  48
  49 static void set_active_eval1( TNLcontext *tnl, GLuint attr, GLuint dim,
  50                               struct gl_1d_map *map )
  51 {
  52    ASSERT(attr < _TNL_NUM_EVAL);
  53    if (!tnl->vtx.eval.map1[attr].map) {
  54       tnl->vtx.eval.map1[attr].map = map;
  55       tnl->vtx.eval.map1[attr].sz = dim;
  56    }
  57 }
  58
  59 static void set_active_eval2( TNLcontext *tnl, GLuint attr, GLuint dim,
  60                               struct gl_2d_map *map )
  61 {
  62    ASSERT(attr < _TNL_NUM_EVAL);
  63    if (!tnl->vtx.eval.map2[attr].map) {
  64       tnl->vtx.eval.map2[attr].map = map;
  65       tnl->vtx.eval.map2[attr].sz = dim;
  66    }
  67 }
  68
  69 void _tnl_update_eval( GLcontext *ctx )
  70 {
  71    TNLcontext *tnl = TNL_CONTEXT(ctx);
  72    GLuint attr;
  73
  74    /* Vertex program maps have priority over conventional attribs */
  75
  76    for (attr = 0; attr < _TNL_NUM_EVAL; attr++) {
  77       clear_active_eval1( tnl, attr );
  78       clear_active_eval2( tnl, attr );
  79    }
  80
  81    if (ctx->Eval.Map1Color4)
  82       set_active_eval1( tnl, VERT_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map1Color4 );
  83
  84    if (ctx->Eval.Map2Color4)
  85       set_active_eval2( tnl, VERT_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map2Color4 );
  86
  87    if (ctx->Eval.Map1TextureCoord4)
  88       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 4, &ctx->EvalMap.Map1Texture4 );
  89    else if (ctx->Eval.Map1TextureCoord3)
  90       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 3, &ctx->EvalMap.Map1Texture3 );
  91    else if (ctx->Eval.Map1TextureCoord2)
  92       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 2, &ctx->EvalMap.Map1Texture2 );
  93    else if (ctx->Eval.Map1TextureCoord1)
  94       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 1, &ctx->EvalMap.Map1Texture1 );
  95
  96    if (ctx->Eval.Map2TextureCoord4)
  97       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 4, &ctx->EvalMap.Map2Texture4 );
  98    else if (ctx->Eval.Map2TextureCoord3)
  99       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 3, &ctx->EvalMap.Map2Texture3 );
 100    else if (ctx->Eval.Map2TextureCoord2)
 101       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 2, &ctx->EvalMap.Map2Texture2 );
 102    else if (ctx->Eval.Map2TextureCoord1)
 103       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 1, &ctx->EvalMap.Map2Texture1 );
 104
 105    if (ctx->Eval.Map1Normal)
 106       set_active_eval1( tnl, VERT_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map1Normal );
 107
 108    if (ctx->Eval.Map2Normal)
 109       set_active_eval2( tnl, VERT_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map2Normal );
 110
 111    if (ctx->Eval.Map1Vertex4)
 112       set_active_eval1( tnl, VERT_ATTRIB_POS, 4, &ctx->EvalMap.Map1Vertex4 );
 113    else if (ctx->Eval.Map1Vertex3)
 114       set_active_eval1( tnl, VERT_ATTRIB_POS, 3, &ctx->EvalMap.Map1Vertex3 );
 115
 116    if (ctx->Eval.Map2Vertex4)
 117       set_active_eval2( tnl, VERT_ATTRIB_POS, 4, &ctx->EvalMap.Map2Vertex4 );
 118    else if (ctx->Eval.Map2Vertex3)
 119       set_active_eval2( tnl, VERT_ATTRIB_POS, 3, &ctx->EvalMap.Map2Vertex3 );
 120
 121    /* Evaluators with generic attributes is only supported for NV vertex
 122     * programs, not ARB vertex programs.  16 evaluator maps are supported.
 123     * We do this after the conventional attributes since the spec says that
 124     * these generic maps have higher priority.
 125     */
 126    if (ctx->VertexProgram._Enabled &&
 127        ctx->VertexProgram._Current &&
 128        ctx->VertexProgram._Current->IsNVProgram) {
 129       for (attr = 0; attr < 16; attr++) {
 130          if (ctx->Eval.Map1Attrib[attr])
 131             set_active_eval1( tnl, attr, 4, &ctx->EvalMap.Map1Attrib[attr] );
 132
 133          if (ctx->Eval.Map2Attrib[attr])
 134             set_active_eval2( tnl, attr, 4, &ctx->EvalMap.Map2Attrib[attr] );
 135       }
 136    }
 137
 138    tnl->vtx.eval.new_state = 0;
 139 }
 140
 141
 142
 143 void _tnl_do_EvalCoord1f(GLcontext* ctx, GLfloat u)
 144 {
 145    TNLcontext *tnl = TNL_CONTEXT(ctx);
 146    GLuint attr;
 147
 148    for (attr = 1; attr < _TNL_NUM_EVAL; attr++) {
 149       struct gl_1d_map *map = tnl->vtx.eval.map1[attr].map;
 150       if (map) {
 151          GLfloat uu = (u - map->u1) * map->du;
 152          GLfloat data[4];
 153
 154          ASSIGN_4V(data, 0, 0, 0, 1);
 155
 156          _math_horner_bezier_curve(map->Points, data, uu,
 157                                    tnl->vtx.eval.map1[attr].sz,
 158                                    map->Order);
 159
 160          COPY_SZ_4V( tnl->vtx.attrptr[attr],
 161                      tnl->vtx.attrsz[attr],
 162                      data );
 163       }
 164    }
 165
 166    /** Vertex -- EvalCoord1f is a noop if this map not enabled:
 167     **/
 168    if (tnl->vtx.eval.map1[0].map) {
 169       struct gl_1d_map *map = tnl->vtx.eval.map1[0].map;
 170       GLfloat uu = (u - map->u1) * map->du;
 171       GLfloat vertex[4];
 172
 173       ASSIGN_4V(vertex, 0, 0, 0, 1);
 174
 175       _math_horner_bezier_curve(map->Points, vertex, uu,
 176                                 tnl->vtx.eval.map1[0].sz,
 177                                 map->Order);
 178
 179       if (tnl->vtx.eval.map1[0].sz == 4)
 180          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 181       else
 182          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 183    }
 184 }
 185
 186
 187
 188 void _tnl_do_EvalCoord2f( GLcontext* ctx, GLfloat u, GLfloat v )
 189 {
 190    TNLcontext *tnl = TNL_CONTEXT(ctx);
 191    GLuint attr;
 192
 193    for (attr = 1; attr < _TNL_NUM_EVAL; attr++) {
 194       struct gl_2d_map *map = tnl->vtx.eval.map2[attr].map;
 195       if (map) {
 196          GLfloat uu = (u - map->u1) * map->du;
 197          GLfloat vv = (v - map->v1) * map->dv;
 198          GLfloat data[4];
 199
 200          ASSIGN_4V(data, 0, 0, 0, 1);
 201
 202          _math_horner_bezier_surf(map->Points,
 203                                   data,
 204                                   uu, vv,
 205                                   tnl->vtx.eval.map2[attr].sz,
 206                                   map->Uorder, map->Vorder);
 207
 208          COPY_SZ_4V( tnl->vtx.attrptr[attr],
 209                      tnl->vtx.attrsz[attr],
 210                      data );
 211       }
 212    }
 213
 214    /** Vertex -- EvalCoord2f is a noop if this map not enabled:
 215     **/
 216    if (tnl->vtx.eval.map2[0].map) {
 217       struct gl_2d_map *map = tnl->vtx.eval.map2[0].map;
 218       GLfloat uu = (u - map->u1) * map->du;
 219       GLfloat vv = (v - map->v1) * map->dv;
 220       GLfloat vertex[4];
 221
 222       ASSIGN_4V(vertex, 0, 0, 0, 1);
 223
 224       if (ctx->Eval.AutoNormal) {
 225          GLfloat normal[4];
 226          GLfloat du[4], dv[4];
 227
 228          _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv,
 229                                  tnl->vtx.eval.map2[0].sz,
 230                                  map->Uorder, map->Vorder);
 231
 232          if (tnl->vtx.eval.map2[0].sz == 4) {
 233             du[0] = du[0]*vertex[3] - du[3]*vertex[0];
 234             du[1] = du[1]*vertex[3] - du[3]*vertex[1];
 235             du[2] = du[2]*vertex[3] - du[3]*vertex[2];
 236
 237             dv[0] = dv[0]*vertex[3] - dv[3]*vertex[0];
 238             dv[1] = dv[1]*vertex[3] - dv[3]*vertex[1];
 239             dv[2] = dv[2]*vertex[3] - dv[3]*vertex[2];
 240          }
 241
 242
 243          CROSS3(normal, du, dv);
 244          NORMALIZE_3FV(normal);
 245          normal[3] = 1.0;
 246
 247          COPY_SZ_4V( tnl->vtx.attrptr[_TNL_ATTRIB_NORMAL],
 248                      tnl->vtx.attrsz[_TNL_ATTRIB_NORMAL],
 249                      normal );
 250
 251       }
 252       else {
 253          _math_horner_bezier_surf(map->Points, vertex, uu, vv,
 254                                   tnl->vtx.eval.map2[0].sz,
 255                                   map->Uorder, map->Vorder);
 256       }
 257
 258       if (tnl->vtx.attrsz[0] == 4)
 259          CALL_Vertex4fv(GET_DISPATCH(), ( vertex ));
 260       else
 261          CALL_Vertex3fv(GET_DISPATCH(), ( vertex ));
 262    }
 263 }
 264
 265