xref: /xsrc/external/mit/MesaLib/dist/src/mesa/tnl/t_vb_texmat.c

/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Keith Whitwell <keithw@vmware.com>
 */


#include "main/glheader.h"
#include "main/macros.h"

#include "main/mtypes.h"

#include "math/m_xform.h"

#include "t_context.h"
#include "t_pipeline.h"

/* Is there any real benefit seperating texmat from texgen?  It means
 * we need two lots of intermediate storage.  Any changes to
 * _NEW_TEXTURE will invalidate both sets -- it's only on changes to
 * *only* _NEW_TEXTURE_MATRIX that texgen survives but texmat doesn't.
 *
 * However, the seperation of this code from the complex texgen stuff
 * is very appealing.
 */
struct texmat_stage_data {
   GLvector4f texcoord[MAX_TEXTURE_COORD_UNITS];
};

#define TEXMAT_STAGE_DATA(stage) ((struct texmat_stage_data *)stage->privatePtr)



static GLboolean run_texmat_stage( struct gl_context *ctx,
				   struct tnl_pipeline_stage *stage )
{
   struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
   GLuint i;

   if (!ctx->Texture._TexMatEnabled || ctx->VertexProgram._Current)
      return GL_TRUE;

   /* ENABLE_TEXMAT implies that the texture matrix is not the
    * identity, so we don't have to check that here.
    */
   for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) {
      if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
	 (void) TransformRaw( &store->texcoord[i],
			      ctx->TextureMatrixStack[i].Top,
			      VB->AttribPtr[_TNL_ATTRIB_TEX0 + i]);

	 VB->AttribPtr[VERT_ATTRIB_TEX0+i] = &store->texcoord[i];
      }
   }

   return GL_TRUE;
}


/* Called the first time stage->run() is invoked.
 */
static GLboolean alloc_texmat_data( struct gl_context *ctx,
				    struct tnl_pipeline_stage *stage )
{
   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
   struct texmat_stage_data *store;
   GLuint i;

   stage->privatePtr = calloc(1, sizeof(*store));
   store = TEXMAT_STAGE_DATA(stage);
   if (!store)
      return GL_FALSE;

   for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
      _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );

   return GL_TRUE;
}


static void free_texmat_data( struct tnl_pipeline_stage *stage )
{
   struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
   GLuint i;

   if (store) {
      for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++)
	 if (store->texcoord[i].data)
	    _mesa_vector4f_free( &store->texcoord[i] );
      free( store );
      stage->privatePtr = NULL;
   }
}



const struct tnl_pipeline_stage _tnl_texture_transform_stage =
{
   "texture transform",			/* name */
   NULL,				/* private data */
   alloc_texmat_data,
   free_texmat_data,			/* destructor */
   NULL,
   run_texmat_stage,
};