t_vb_texmat.c revision 62e1fae858509615c6e54e0b9388cfa2691a5919 
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 "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 */
49struct 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
57static 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->ShaderObjects._VertexShaderPresent)
65      return GL_TRUE;
66
67   if (!ctx->Texture._TexMatEnabled || ctx->VertexProgram._Enabled)
68      return GL_TRUE;
69
70   /* ENABLE_TEXMAT implies that the texture matrix is not the
71    * identity, so we don't have to check that here.
72    */
73   for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) {
74      if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
75	 (void) TransformRaw( &store->texcoord[i],
76			      ctx->TextureMatrixStack[i].Top,
77			      VB->AttribPtr[_TNL_ATTRIB_TEX0 + i]);
78
79         VB->TexCoordPtr[i] =
80	 VB->AttribPtr[VERT_ATTRIB_TEX0+i] = &store->texcoord[i];
81      }
82   }
83
84   return GL_TRUE;
85}
86
87
88/* Called the first time stage->run() is invoked.
89 */
90static GLboolean alloc_texmat_data( GLcontext *ctx,
91				    struct tnl_pipeline_stage *stage )
92{
93   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
94   struct texmat_stage_data *store;
95   GLuint i;
96
97   stage->privatePtr = CALLOC(sizeof(*store));
98   store = TEXMAT_STAGE_DATA(stage);
99   if (!store)
100      return GL_FALSE;
101
102   for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
103      _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
104
105   return GL_TRUE;
106}
107
108
109static void free_texmat_data( struct tnl_pipeline_stage *stage )
110{
111   struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
112   GLuint i;
113
114   if (store) {
115      for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
116	 if (store->texcoord[i].data)
117	    _mesa_vector4f_free( &store->texcoord[i] );
118      FREE( store );
119      stage->privatePtr = NULL;
120   }
121}
122
123
124
125const struct tnl_pipeline_stage _tnl_texture_transform_stage =
126{
127   "texture transform",			/* name */
128   NULL,				/* private data */
129   alloc_texmat_data,
130   free_texmat_data,			/* destructor */
131   NULL,
132   run_texmat_stage,
133};
134