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