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      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 (at) 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  */
     48 struct 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 
     56 static 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  */
     85 static 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 
    104 static 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 
    120 const 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