src/mesa/tnl/t_vb_texmat.c

   1 /* $Id: t_vb_texmat.c,v 1.12 2003/03/01 01:50:28 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keith@tungstengraphics.com>
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "macros.h"
  35 #include "imports.h"
  36 #include "mtypes.h"
  37
  38 #include "math/m_xform.h"
  39
  40 #include "t_context.h"
  41 #include "t_pipeline.h"
  42
  43 /* Is there any real benefit seperating texmat from texgen?  It means
  44  * we need two lots of intermediate storage.  Any changes to
  45  * _NEW_TEXTURE will invalidate both sets -- it's only on changes to
  46  * *only* _NEW_TEXTURE_MATRIX that texgen survives but texmat doesn't.
  47  *
  48  * However, the seperation of this code from the complex texgen stuff
  49  * is very appealing.
  50  */
  51 struct texmat_stage_data {
  52    GLvector4f texcoord[MAX_TEXTURE_COORD_UNITS];
  53 };
  54
  55 #define TEXMAT_STAGE_DATA(stage) ((struct texmat_stage_data *)stage->privatePtr)
  56
  57 static void check_texmat( GLcontext *ctx, struct gl_pipeline_stage *stage )
  58 {
  59    GLuint i;
  60    stage->active = 0;
  61
  62    if (ctx->Texture._TexMatEnabled && !ctx->VertexProgram.Enabled) {
  63       GLuint flags = 0;
  64
  65       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
  66          if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i))
  67             flags |= VERT_BIT_TEX(i);
  68
  69       stage->active = 1;
  70       stage->inputs = flags;
  71       stage->outputs = flags;
  72    }
  73 }
  74
  75 static GLboolean run_texmat_stage( GLcontext *ctx,
  76                                    struct gl_pipeline_stage *stage )
  77 {
  78    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
  79    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
  80    GLuint i;
  81
  82    /* ENABLE_TEXMAT implies that the texture matrix is not the
  83     * identity, so we don't have to check that here.
  84     */
  85    for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
  86       if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
  87          if (stage->changed_inputs & VERT_BIT_TEX(i))
  88             (void) TransformRaw( &store->texcoord[i],
  89                                  ctx->TextureMatrixStack[i].Top,
  90                                  VB->TexCoordPtr[i]);
  91
  92          VB->TexCoordPtr[i] = &store->texcoord[i];
  93       }
  94    return GL_TRUE;
  95 }
  96
  97
  98 /* Called the first time stage->run() is invoked.
  99  */
 100 static GLboolean alloc_texmat_data( GLcontext *ctx,
 101                                     struct gl_pipeline_stage *stage )
 102 {
 103    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
 104    struct texmat_stage_data *store;
 105    GLuint i;
 106
 107    stage->privatePtr = CALLOC(sizeof(*store));
 108    store = TEXMAT_STAGE_DATA(stage);
 109    if (!store)
 110       return GL_FALSE;
 111
 112    for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 113       _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
 114
 115    /* Now run the stage.
 116     */
 117    stage->run = run_texmat_stage;
 118    return stage->run( ctx, stage );
 119 }
 120
 121
 122 static void free_texmat_data( struct gl_pipeline_stage *stage )
 123 {
 124    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
 125    GLuint i;
 126
 127    if (store) {
 128       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
 129          if (store->texcoord[i].data)
 130             _mesa_vector4f_free( &store->texcoord[i] );
 131       FREE( store );
 132       stage->privatePtr = 0;
 133    }
 134 }
 135
 136
 137
 138 const struct gl_pipeline_stage _tnl_texture_transform_stage =
 139 {
 140    "texture transform",                 /* name */
 141    _NEW_TEXTURE|_NEW_TEXTURE_MATRIX,    /* check_state */
 142    _NEW_TEXTURE|_NEW_TEXTURE_MATRIX,    /* run_state */
 143    GL_FALSE,                            /* active? */
 144    0,                                   /* inputs */
 145    0,                                   /* outputs */
 146    0,                                   /* changed_inputs */
 147    NULL,                                /* private data */
 148    free_texmat_data,                    /* destructor */
 149    check_texmat,                        /* check */
 150    alloc_texmat_data,                   /* run -- initially set to init */
 151 };