src/mesa/tnl/t_vb_texmat.c

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