src/mesa/tnl/t_vb_texmat.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  5.1
   4  *
   5  * Copyright (C) 1999-2003  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 "glheader.h"
  30 #include "colormac.h"
  31 #include "context.h"
  32 #include "macros.h"
  33 #include "imports.h"
  34 #include "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 static void check_texmat( GLcontext *ctx, struct tnl_pipeline_stage *stage )
  56 {
  57    GLuint i;
  58    stage->active = 0;
  59
  60    if (ctx->Texture._TexMatEnabled && !ctx->VertexProgram.Enabled) {
  61       GLuint flags = 0;
  62
  63       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
  64          if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i))
  65             flags |= _TNL_BIT_TEX(i);
  66
  67       stage->active = 1;
  68       stage->inputs = flags;
  69       stage->outputs = flags;
  70    }
  71 }
  72
  73 static GLboolean run_texmat_stage( GLcontext *ctx,
  74                                    struct tnl_pipeline_stage *stage )
  75 {
  76    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
  77    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  78    GLuint i;
  79
  80    /* ENABLE_TEXMAT implies that the texture matrix is not the
  81     * identity, so we don't have to check that here.
  82     */
  83    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
  84       if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
  85          if (stage->changed_inputs & _TNL_BIT_TEX(i))
  86             (void) TransformRaw( &store->texcoord[i],
  87                                  ctx->TextureMatrixStack[i].Top,
  88                                  VB->TexCoordPtr[i]);
  89
  90          VB->TexCoordPtr[i] = &store->texcoord[i];
  91       }
  92    return GL_TRUE;
  93 }
  94
  95
  96 /* Called the first time stage->run() is invoked.
  97  */
  98 static GLboolean alloc_texmat_data( GLcontext *ctx,
  99                                     struct tnl_pipeline_stage *stage )
 100 {
 101    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 102    struct texmat_stage_data *store;
 103    GLuint i;
 104
 105    stage->privatePtr = CALLOC(sizeof(*store));
 106    store = TEXMAT_STAGE_DATA(stage);
 107    if (!store)
 108       return GL_FALSE;
 109
 110    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 111       _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
 112
 113    /* Now run the stage.
 114     */
 115    stage->run = run_texmat_stage;
 116    return stage->run( ctx, stage );
 117 }
 118
 119
 120 static void free_texmat_data( struct tnl_pipeline_stage *stage )
 121 {
 122    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
 123    GLuint i;
 124
 125    if (store) {
 126       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
 127          if (store->texcoord[i].data)
 128             _mesa_vector4f_free( &store->texcoord[i] );
 129       FREE( store );
 130       stage->privatePtr = 0;
 131    }
 132 }
 133
 134
 135
 136 const struct tnl_pipeline_stage _tnl_texture_transform_stage =
 137 {
 138    "texture transform",                 /* name */
 139    _NEW_TEXTURE|_NEW_TEXTURE_MATRIX,    /* check_state */
 140    _NEW_TEXTURE|_NEW_TEXTURE_MATRIX,    /* run_state */
 141    GL_FALSE,                            /* active? */
 142    0,                                   /* inputs */
 143    0,                                   /* outputs */
 144    0,                                   /* changed_inputs */
 145    NULL,                                /* private data */
 146    free_texmat_data,                    /* destructor */
 147    check_texmat,                        /* check */
 148    alloc_texmat_data,                   /* run -- initially set to init */
 149 };