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  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.  
  264.