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
  35
  36 static void clear_active_eval1( TNLcontext *tnl, GLuint attr )
  37 {
  38    tnl->vtx.eval.map1[attr].map = 0;
  39 }
  40
  41 static void clear_active_eval2( TNLcontext *tnl, GLuint attr )
  42 {
  43    tnl->vtx.eval.map2[attr].map = 0;
  44 }
  45
  46 static void set_active_eval1( TNLcontext *tnl, GLuint attr, GLuint dim,
  47                               struct gl_1d_map *map )
  48 {
  49    if (!tnl->vtx.eval.map1[attr].map) {
  50       tnl->vtx.eval.map1[attr].map = map;
  51       tnl->vtx.eval.map1[attr].sz = dim;
  52    }
  53 }
  54
  55 static void set_active_eval2( TNLcontext *tnl, GLuint attr, GLuint dim,
  56                               struct gl_2d_map *map )
  57 {
  58    if (!tnl->vtx.eval.map2[attr].map) {
  59       tnl->vtx.eval.map2[attr].map = map;
  60       tnl->vtx.eval.map2[attr].sz = dim;
  61    }
  62 }
  63
  64 void _tnl_update_eval( GLcontext *ctx )
  65 {
  66    TNLcontext *tnl = TNL_CONTEXT(ctx);
  67    GLuint attr;
  68
  69    /* Vertex program maps have priority over conventional attribs */
  70
  71    for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
  72       clear_active_eval1( tnl, attr );
  73       clear_active_eval2( tnl, attr );
  74    }
  75
  76    if (ctx->VertexProgram._Enabled) {
  77       for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) {
  78          if (ctx->Eval.Map1Attrib[attr])
  79             set_active_eval1( tnl, attr, 4, &ctx->EvalMap.Map1Attrib[attr] );
  80
  81          if (ctx->Eval.Map2Attrib[attr])
  82             set_active_eval2( tnl, attr, 4, &ctx->EvalMap.Map2Attrib[attr] );
  83       }
  84    }
  85
  86    if (ctx->Eval.Map1Color4)
  87       set_active_eval1( tnl, VERT_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map1Color4 );
  88
  89    if (ctx->Eval.Map2Color4)
  90       set_active_eval2( tnl, VERT_ATTRIB_COLOR0, 4, &ctx->EvalMap.Map2Color4 );
  91
  92    if (ctx->Eval.Map1TextureCoord4)
  93       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 4, &ctx->EvalMap.Map1Texture4 );
  94    else if (ctx->Eval.Map1TextureCoord3)
  95       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 3, &ctx->EvalMap.Map1Texture3 );
  96    else if (ctx->Eval.Map1TextureCoord2)
  97       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 2, &ctx->EvalMap.Map1Texture2 );
  98    else if (ctx->Eval.Map1TextureCoord1)
  99       set_active_eval1( tnl, VERT_ATTRIB_TEX0, 1, &ctx->EvalMap.Map1Texture1 );
 100
 101    if (ctx->Eval.Map2TextureCoord4)
 102       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 4, &ctx->EvalMap.Map2Texture4 );
 103    else if (ctx->Eval.Map2TextureCoord3)
 104       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 3, &ctx->EvalMap.Map2Texture3 );
 105    else if (ctx->Eval.Map2TextureCoord2)
 106       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 2, &ctx->EvalMap.Map2Texture2 );
 107    else if (ctx->Eval.Map2TextureCoord1)
 108       set_active_eval2( tnl, VERT_ATTRIB_TEX0, 1, &ctx->EvalMap.Map2Texture1 );
 109
 110    if (ctx->Eval.Map1Normal)
 111       set_active_eval1( tnl, VERT_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map1Normal );
 112
 113    if (ctx->Eval.Map2Normal)
 114       set_active_eval2( tnl, VERT_ATTRIB_NORMAL, 3, &ctx->EvalMap.Map2Normal );
 115
 116    if (ctx->Eval.Map1Vertex4)
 117       set_active_eval1( tnl, VERT_ATTRIB_POS, 4, &ctx->EvalMap.Map1Vertex4 );
 118    else if (ctx->Eval.Map1Vertex3)
 119       set_active_eval1( tnl, VERT_ATTRIB_POS, 3, &ctx->EvalMap.Map1Vertex3 );
 120
 121    if (ctx->Eval.Map2Vertex4)
 122       set_active_eval2( tnl, VERT_ATTRIB_POS, 4, &ctx->EvalMap.Map2Vertex4 );
 123    else if (ctx->Eval.Map2Vertex3)
 124       set_active_eval2( tnl, VERT_ATTRIB_POS, 3, &ctx->EvalMap.Map2Vertex3 );
 125
 126    tnl->vtx.eval.new_state = 0;
 127 }
 128
 129
 130
 131 void _tnl_do_EvalCoord1f(GLcontext* ctx, GLfloat u)
 132 {
 133    TNLcontext *tnl = TNL_CONTEXT(ctx);
 134    GLuint attr;
 135
 136    for (attr = 1; attr <= _TNL_ATTRIB_INDEX; attr++) {
 137       struct gl_1d_map *map = tnl->vtx.eval.map1[attr].map;
 138       if (map) {
 139          GLfloat uu = (u - map->u1) * map->du;
 140          GLfloat data[4];
 141
 142          ASSIGN_4V(data, 0, 0, 0, 1);
 143
 144          _math_horner_bezier_curve(map->Points, data, uu,
 145                                    tnl->vtx.eval.map1[attr].sz,
 146                                    map->Order);
 147
 148          COPY_SZ_4V( tnl->vtx.attrptr[attr],
 149                      tnl->vtx.attrsz[attr],
 150                      data );
 151       }
 152    }
 153
 154    /** Vertex -- EvalCoord1f is a noop if this map not enabled:
 155     **/
 156    if (tnl->vtx.eval.map1[0].map) {
 157       struct gl_1d_map *map = tnl->vtx.eval.map1[0].map;
 158       GLfloat uu = (u - map->u1) * map->du;
 159       GLfloat vertex[4];
 160
 161       ASSIGN_4V(vertex, 0, 0, 0, 1);
 162
 163       _math_horner_bezier_curve(map->Points, vertex, uu,
 164                                 tnl->vtx.eval.map1[0].sz,
 165                                 map->Order);
 166
 167       if (tnl->vtx.eval.map1[0].sz == 4)
 168          glVertex4fv( vertex );
 169       else
 170          glVertex3fv( vertex );
 171    }
 172 }
 173
 174
 175
 176 void _tnl_do_EvalCoord2f( GLcontext* ctx, GLfloat u, GLfloat v )
 177 {
 178    TNLcontext *tnl = TNL_CONTEXT(ctx);
 179    GLuint attr;
 180
 181    for (attr = 1; attr <= _TNL_ATTRIB_INDEX; attr++) {
 182       struct gl_2d_map *map = tnl->vtx.eval.map2[attr].map;
 183       if (map) {
 184          GLfloat uu = (u - map->u1) * map->du;
 185          GLfloat vv = (v - map->v1) * map->dv;
 186          GLfloat data[4];
 187
 188          ASSIGN_4V(data, 0, 0, 0, 1);
 189
 190          _math_horner_bezier_surf(map->Points,
 191                                   data,
 192                                   uu, vv,
 193                                   tnl->vtx.eval.map2[attr].sz,
 194                                   map->Uorder, map->Vorder);
 195
 196          COPY_SZ_4V( tnl->vtx.attrptr[attr],
 197                      tnl->vtx.attrsz[attr],
 198                      data );
 199       }
 200    }
 201
 202    /** Vertex -- EvalCoord2f is a noop if this map not enabled:
 203     **/
 204    if (tnl->vtx.eval.map2[0].map) {
 205       struct gl_2d_map *map = tnl->vtx.eval.map2[0].map;
 206       GLfloat uu = (u - map->u1) * map->du;
 207       GLfloat vv = (v - map->v1) * map->dv;
 208       GLfloat vertex[4];
 209
 210       ASSIGN_4V(vertex, 0, 0, 0, 1);
 211
 212       if (ctx->Eval.AutoNormal) {
 213          GLfloat normal[4];
 214          GLfloat du[4], dv[4];
 215
 216          _math_de_casteljau_surf(map->Points, vertex, du, dv, uu, vv,
 217                                  tnl->vtx.eval.map2[0].sz,
 218                                  map->Uorder, map->Vorder);
 219
 220          if (tnl->vtx.eval.map2[0].sz == 4) {
 221             du[0] = du[0]*vertex[3] - du[3]*vertex[0];
 222             du[1] = du[1]*vertex[3] - du[3]*vertex[1];
 223             du[2] = du[2]*vertex[3] - du[3]*vertex[2];
 224
 225             dv[0] = dv[0]*vertex[3] - dv[3]*vertex[0];
 226             dv[1] = dv[1]*vertex[3] - dv[3]*vertex[1];
 227             dv[2] = dv[2]*vertex[3] - dv[3]*vertex[2];
 228          }
 229
 230
 231          CROSS3(normal, du, dv);
 232          NORMALIZE_3FV(normal);
 233          normal[3] = 1.0;
 234
 235          COPY_SZ_4V( tnl->vtx.attrptr[_TNL_ATTRIB_NORMAL],
 236                      tnl->vtx.attrsz[_TNL_ATTRIB_NORMAL],
 237                      normal );
 238
 239       }
 240       else {
 241          _math_horner_bezier_surf(map->Points, vertex, uu, vv,
 242                                   tnl->vtx.eval.map2[0].sz,
 243                                   map->Uorder, map->Vorder);
 244       }
 245
 246       if (tnl->vtx.attrsz[0] == 4)
 247          glVertex4fv( vertex );
 248       else
 249          glVertex3fv( vertex );
 250    }
 251 }
 252
 253