src/mesa/tnl/t_vb_texmat.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.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(1, 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 };