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/* $Id: t_vb_texmat.c,v 1.1 2003-02-28 11:48:08 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  3.5
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 *
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 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 * Authors:
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 *    Keith Whitwell <keith@tungstengraphics.com>
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 */
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#include "glheader.h"
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#include "colormac.h"
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#include "context.h"
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#include "macros.h"
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#include "imports.h"
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#include "mmath.h"
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#include "mtypes.h"
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#include "math/m_xform.h"
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#include "t_context.h"
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#include "t_pipeline.h"
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/* Is there any real benefit seperating texmat from texgen?  It means
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 * we need two lots of intermediate storage.  Any changes to
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 * _NEW_TEXTURE will invalidate both sets -- it's only on changes to
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 * *only* _NEW_TEXTURE_MATRIX that texgen survives but texmat doesn't.
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 *
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 * However, the seperation of this code from the complex texgen stuff
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 * is very appealing.
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 */
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struct texmat_stage_data {
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   GLvector4f texcoord[MAX_TEXTURE_UNITS];
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};
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#define TEXMAT_STAGE_DATA(stage) ((struct texmat_stage_data *)stage->privatePtr)
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static void check_texmat( GLcontext *ctx, struct gl_pipeline_stage *stage )
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{
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   GLuint i;
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   stage->active = 0;
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   if (ctx->Texture._TexMatEnabled && !ctx->VertexProgram.Enabled) {
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      GLuint flags = 0;
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      for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
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         if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i))
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            flags |= VERT_BIT_TEX(i);
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      stage->active = 1;
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      stage->inputs = flags;
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      stage->outputs = flags;
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   }
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}
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static GLboolean run_texmat_stage( GLcontext *ctx,
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                                   struct gl_pipeline_stage *stage )
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{
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   struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
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   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
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   GLuint i;
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   /* ENABLE_TEXMAT implies that the texture matrix is not the
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    * identity, so we don't have to check that here.
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    */
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   for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
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      if (ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i)) {
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         if (stage->changed_inputs & VERT_BIT_TEX(i))
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            (void) TransformRaw( &store->texcoord[i],
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                                 ctx->TextureMatrixStack[i].Top,
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                                 VB->TexCoordPtr[i]);
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         VB->TexCoordPtr[i] = &store->texcoord[i];
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      }
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   return GL_TRUE;
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}
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/* Called the first time stage->run() is invoked.
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 */
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static GLboolean alloc_texmat_data( GLcontext *ctx,
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                                    struct gl_pipeline_stage *stage )
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{
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   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
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   struct texmat_stage_data *store;
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   GLuint i;
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   stage->privatePtr = CALLOC(sizeof(*store));
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   store = TEXMAT_STAGE_DATA(stage);
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   if (!store)
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      return GL_FALSE;
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   for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
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      _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 );
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   /* Now run the stage.
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    */
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   stage->run = run_texmat_stage;
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   return stage->run( ctx, stage );
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}
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static void free_texmat_data( struct gl_pipeline_stage *stage )
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{
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   struct texmat_stage_data *store = TEXMAT_STAGE_DATA(stage);
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   GLuint i;
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   if (store) {
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      for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
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         if (store->texcoord[i].data)
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            _mesa_vector4f_free( &store->texcoord[i] );
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      FREE( store );
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      stage->privatePtr = 0;
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   }
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}
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const struct gl_pipeline_stage _tnl_texture_transform_stage =
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{
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   "texture transform",                 /* name */
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   _NEW_TEXTURE|_NEW_TEXTURE_MATRIX,    /* check_state */
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   _NEW_TEXTURE|_NEW_TEXTURE_MATRIX,    /* run_state */
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   GL_FALSE,                            /* active? */
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   0,                                   /* inputs */
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   0,                                   /* outputs */
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   0,                                   /* changed_inputs */
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   NULL,                                /* private data */
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   free_texmat_data,                    /* destructor */
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   check_texmat,                        /* check */
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   alloc_texmat_data,                   /* run -- initially set to init */
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};