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  1. /*
  2.  * Mesa 3-D graphics library
  3.  * Version:  6.5
  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.  
  29. #include "main/glheader.h"
  30. #include "main/colormac.h"
  31. #include "main/macros.h"
  32. #include "main/imports.h"
  33. #include "main/mtypes.h"
  34.  
  35. #include "math/m_xform.h"
  36.  
  37. #include "t_context.h"
  38. #include "t_pipeline.h"
  39.  
  40. /* Is there any real benefit seperating texmat from texgen?  It means
  41.  * we need two lots of intermediate storage.  Any changes to
  42.  * _NEW_TEXTURE will invalidate both sets -- it's only on changes to
  43.  * *only* _NEW_TEXTURE_MATRIX that texgen survives but texmat doesn't.
  44.  *
  45.  * However, the seperation of this code from the complex texgen stuff
  46.  * is very appealing.
  47.  */
  48. struct texmat_stage_data {
  49.    GLvector4f texcoord[MAX_TEXTURE_COORD_UNITS];
  50. };
  51.  
  52. #define TEXMAT_STAGE_DATA(stage) ((struct texmat_stage_data *)stage->privatePtr)
  53.  
  54.  
  55.  
  56. static GLboolean run_texmat_stage( struct gl_context *ctx,
  57.                                    struct tnl_pipeline_stage *stage )
  58. {
  59.    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
  60.    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  61.    GLuint i;
  62.  
  63.    if (!ctx->Texture._TexMatEnabled || ctx->VertexProgram._Current)
  64.       return GL_TRUE;
  65.  
  66.    /* ENABLE_TEXMAT implies that the texture matrix is not the
  67.     * identity, so we don't have to check that here.
  68.     */
  69.    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) {
  70.       if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
  71.          (void) TransformRaw( &store->texcoord[i],
  72.                               ctx->TextureMatrixStack[i].Top,
  73.                               VB->AttribPtr[_TNL_ATTRIB_TEX0 + i]);
  74.  
  75.          VB->AttribPtr[VERT_ATTRIB_TEX0+i] = &store->texcoord[i];
  76.       }
  77.    }
  78.  
  79.    return GL_TRUE;
  80. }
  81.  
  82.  
  83. /* Called the first time stage->run() is invoked.
  84.  */
  85. static GLboolean alloc_texmat_data( struct gl_context *ctx,
  86.                                     struct tnl_pipeline_stage *stage )
  87. {
  88.    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  89.    struct texmat_stage_data *store;
  90.    GLuint i;
  91.  
  92.    stage->privatePtr = CALLOC(sizeof(*store));
  93.    store = TEXMAT_STAGE_DATA(stage);
  94.    if (!store)
  95.       return GL_FALSE;
  96.  
  97.    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
  98.       _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
  99.  
  100.    return GL_TRUE;
  101. }
  102.  
  103.  
  104. static void free_texmat_data( struct tnl_pipeline_stage *stage )
  105. {
  106.    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
  107.    GLuint i;
  108.  
  109.    if (store) {
  110.       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
  111.          if (store->texcoord[i].data)
  112.             _mesa_vector4f_free( &store->texcoord[i] );
  113.       FREE( store );
  114.       stage->privatePtr = NULL;
  115.    }
  116. }
  117.  
  118.  
  119.  
  120. const struct tnl_pipeline_stage _tnl_texture_transform_stage =
  121. {
  122.    "texture transform",                 /* name */
  123.    NULL,                                /* private data */
  124.    alloc_texmat_data,
  125.    free_texmat_data,                    /* destructor */
  126.    NULL,
  127.    run_texmat_stage,
  128. };
  129.