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