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      1 /*
      2  * Mesa 3-D graphics library
      3  *
      4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included
     14  * in all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors:
     25  *    Keith Whitwell <keithw (at) vmware.com>
     26  */
     27 
     28 
     29 #include "main/glheader.h"
     30 #include "main/macros.h"
     31 #include "main/imports.h"
     32 #include "main/mtypes.h"
     33 
     34 #include "math/m_xform.h"
     35 
     36 #include "t_context.h"
     37 #include "t_pipeline.h"
     38 
     39 /* Is there any real benefit seperating texmat from texgen?  It means
     40  * we need two lots of intermediate storage.  Any changes to
     41  * _NEW_TEXTURE will invalidate both sets -- it's only on changes to
     42  * *only* _NEW_TEXTURE_MATRIX that texgen survives but texmat doesn't.
     43  *
     44  * However, the seperation of this code from the complex texgen stuff
     45  * is very appealing.
     46  */
     47 struct texmat_stage_data {
     48    GLvector4f texcoord[MAX_TEXTURE_COORD_UNITS];
     49 };
     50 
     51 #define TEXMAT_STAGE_DATA(stage) ((struct texmat_stage_data *)stage->privatePtr)
     52 
     53 
     54 
     55 static GLboolean run_texmat_stage( struct gl_context *ctx,
     56 				   struct tnl_pipeline_stage *stage )
     57 {
     58    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
     59    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
     60    GLuint i;
     61 
     62    if (!ctx->Texture._TexMatEnabled || ctx->VertexProgram._Current)
     63       return GL_TRUE;
     64 
     65    /* ENABLE_TEXMAT implies that the texture matrix is not the
     66     * identity, so we don't have to check that here.
     67     */
     68    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) {
     69       if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
     70 	 (void) TransformRaw( &store->texcoord[i],
     71 			      ctx->TextureMatrixStack[i].Top,
     72 			      VB->AttribPtr[_TNL_ATTRIB_TEX0 + i]);
     73 
     74 	 VB->AttribPtr[VERT_ATTRIB_TEX0+i] = &store->texcoord[i];
     75       }
     76    }
     77 
     78    return GL_TRUE;
     79 }
     80 
     81 
     82 /* Called the first time stage->run() is invoked.
     83  */
     84 static GLboolean alloc_texmat_data( struct gl_context *ctx,
     85 				    struct tnl_pipeline_stage *stage )
     86 {
     87    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
     88    struct texmat_stage_data *store;
     89    GLuint i;
     90 
     91    stage->privatePtr = calloc(1, sizeof(*store));
     92    store = TEXMAT_STAGE_DATA(stage);
     93    if (!store)
     94       return GL_FALSE;
     95 
     96    for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
     97       _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
     98 
     99    return GL_TRUE;
    100 }
    101 
    102 
    103 static void free_texmat_data( struct tnl_pipeline_stage *stage )
    104 {
    105    struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
    106    GLuint i;
    107 
    108    if (store) {
    109       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
    110 	 if (store->texcoord[i].data)
    111 	    _mesa_vector4f_free( &store->texcoord[i] );
    112       free( store );
    113       stage->privatePtr = NULL;
    114    }
    115 }
    116 
    117 
    118 
    119 const struct tnl_pipeline_stage _tnl_texture_transform_stage =
    120 {
    121    "texture transform",			/* name */
    122    NULL,				/* private data */
    123    alloc_texmat_data,
    124    free_texmat_data,			/* destructor */
    125    NULL,
    126    run_texmat_stage,
    127 };
    128