t_context.c

来自「mesa-6.5-minigui源码」· C语言 代码 · 共 290 行

/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 1999-2005  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
 * BRIAN PAUL 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 <[e-mail]>
 */


#include "api_arrayelt.h"
#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "macros.h"
#include "mtypes.h"
#include "dlist.h"
#include "light.h"
#include "vtxfmt.h"

#include "tnl.h"
#include "t_array_api.h"
#include "t_context.h"
#include "t_pipeline.h"
#include "t_save_api.h"
#include "t_vp_build.h"
#include "t_vtx_api.h"



static void
install_driver_callbacks( GLcontext *ctx )
{
   ctx->Driver.NewList = _tnl_NewList;
   ctx->Driver.EndList = _tnl_EndList;
   ctx->Driver.FlushVertices = _tnl_FlushVertices;
   ctx->Driver.SaveFlushVertices = _tnl_SaveFlushVertices;
   ctx->Driver.BeginCallList = _tnl_BeginCallList;
   ctx->Driver.EndCallList = _tnl_EndCallList;
}



GLboolean
_tnl_CreateContext( GLcontext *ctx )
{
   TNLcontext *tnl;

   /* Create the TNLcontext structure
    */
   ctx->swtnl_context = tnl = (TNLcontext *) CALLOC( sizeof(TNLcontext) );

   if (!tnl) {
      return GL_FALSE;
   }

   if (_mesa_getenv("MESA_CODEGEN"))
      tnl->AllowCodegen = GL_TRUE;

   /* Initialize the VB.
    */
   tnl->vb.Size = ctx->Const.MaxArrayLockSize + MAX_CLIPPED_VERTICES;


   /* Initialize tnl state and tnl->vtxfmt.
    */
   _tnl_save_init( ctx );
   _tnl_array_init( ctx );
   _tnl_vtx_init( ctx );

   if (ctx->_MaintainTnlProgram) {
      tnl->vp_cache = (struct tnl_cache *) MALLOC(sizeof(*tnl->vp_cache));
      tnl->vp_cache->size = 5;
      tnl->vp_cache->n_items = 0;
      tnl->vp_cache->items = (struct tnl_cache_item**)
         _mesa_malloc(tnl->vp_cache->size * sizeof(*tnl->vp_cache->items));
      _mesa_memset(tnl->vp_cache->items, 0, tnl->vp_cache->size *
				sizeof(*tnl->vp_cache->items));
      
      _tnl_install_pipeline( ctx, _tnl_vp_pipeline );
   } else {
      _tnl_install_pipeline( ctx, _tnl_default_pipeline );
   }

   /* Initialize the arrayelt helper
    */
   if (!_ae_create_context( ctx ))
      return GL_FALSE;


   tnl->NeedNdcCoords = GL_TRUE;
   tnl->LoopbackDListCassettes = GL_FALSE;
   tnl->CalcDListNormalLengths = GL_TRUE;
   tnl->AllowVertexFog = GL_TRUE;
   tnl->AllowPixelFog = GL_TRUE;

   /* Hook our functions into exec and compile dispatch tables.
    */
   _mesa_install_exec_vtxfmt( ctx, &tnl->exec_vtxfmt );


   /* Set a few default values in the driver struct.
    */
   install_driver_callbacks(ctx);
   ctx->Driver.NeedFlush = 0;
   ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
   ctx->Driver.CurrentSavePrimitive = PRIM_UNKNOWN;

   tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
   tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
   tnl->Driver.NotifyMaterialChange = _mesa_validate_all_lighting_tables;

   return GL_TRUE;
}


void
_tnl_DestroyContext( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

   _tnl_array_destroy( ctx );
   _tnl_vtx_destroy( ctx );
   _tnl_save_destroy( ctx );
   _tnl_destroy_pipeline( ctx );
   _ae_destroy_context( ctx );

   if (ctx->_MaintainTnlProgram)
      _tnl_ProgramCacheDestroy( ctx );

   FREE(tnl);
   ctx->swtnl_context = NULL;
}


void
_tnl_InvalidateState( GLcontext *ctx, GLuint new_state )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

   if (new_state & (_NEW_HINT)) {
      ASSERT(tnl->AllowVertexFog || tnl->AllowPixelFog);
      tnl->_DoVertexFog = (tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST))
         || !tnl->AllowPixelFog;
   }

   _ae_invalidate_state(ctx, new_state);

   tnl->pipeline.new_state |= new_state;
   tnl->vtx.eval.new_state |= new_state;

   /* Calculate tnl->render_inputs:
    */
   if (ctx->Visual.rgbMode) {
      tnl->render_inputs = (_TNL_BIT_POS|
			    _TNL_BIT_COLOR0|
			    (ctx->Texture._EnabledCoordUnits << _TNL_ATTRIB_TEX0));

      if (NEED_SECONDARY_COLOR(ctx))
	 tnl->render_inputs |= _TNL_BIT_COLOR1;
   }
   else {
      tnl->render_inputs |= (_TNL_BIT_POS|_TNL_BIT_INDEX);
   }
    
   if (ctx->Fog.Enabled ||
       (ctx->FragmentProgram._Active &&
        ctx->FragmentProgram._Current->FogOption != GL_NONE))
      tnl->render_inputs |= _TNL_BIT_FOG;

   if (ctx->Polygon.FrontMode != GL_FILL || 
       ctx->Polygon.BackMode != GL_FILL)
      tnl->render_inputs |= _TNL_BIT_EDGEFLAG;

   if (ctx->RenderMode == GL_FEEDBACK)
      tnl->render_inputs |= _TNL_BIT_TEX0;

   if (ctx->Point._Attenuated ||
       (ctx->VertexProgram._Enabled && ctx->VertexProgram.PointSizeEnabled))
      tnl->render_inputs |= _TNL_BIT_POINTSIZE;
}


void
_tnl_wakeup_exec( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

   install_driver_callbacks(ctx);
   ctx->Driver.NeedFlush |= FLUSH_UPDATE_CURRENT;

   /* Hook our functions into exec and compile dispatch tables.
    */
   _mesa_install_exec_vtxfmt( ctx, &tnl->exec_vtxfmt );

   /* Assume we haven't been getting state updates either:
    */
   _tnl_InvalidateState( ctx, ~0 );

   if (ctx->Light.ColorMaterialEnabled) {
      _mesa_update_color_material( ctx, 
				   ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
   }
}


void
_tnl_wakeup_save_exec( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

   _tnl_wakeup_exec( ctx );
   _mesa_install_save_vtxfmt( ctx, &tnl->save_vtxfmt );
}


/**
 * Drivers call this function to tell the TCL module whether or not
 * it wants Normalized Device Coords (NDC) computed.  I.e. whether
 * we should "Divide-by-W".  Software renders will want that.
 */
void
_tnl_need_projected_coords( GLcontext *ctx, GLboolean mode )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   if (tnl->NeedNdcCoords != mode) {
      tnl->NeedNdcCoords = mode;
      _tnl_InvalidateState( ctx, _NEW_PROJECTION );
   }
}

void
_tnl_need_dlist_loopback( GLcontext *ctx, GLboolean mode )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   tnl->LoopbackDListCassettes = mode;
}

void
_tnl_need_dlist_norm_lengths( GLcontext *ctx, GLboolean mode )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   tnl->CalcDListNormalLengths = mode;
}

void
_tnl_isolate_materials( GLcontext *ctx, GLboolean mode )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   tnl->IsolateMaterials = mode;
}

void
_tnl_allow_vertex_fog( GLcontext *ctx, GLboolean value )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   tnl->AllowVertexFog = value;
   tnl->_DoVertexFog = (tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST))
      || !tnl->AllowPixelFog;

}

void
_tnl_allow_pixel_fog( GLcontext *ctx, GLboolean value )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   tnl->AllowPixelFog = value;
   tnl->_DoVertexFog = (tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST))
      || !tnl->AllowPixelFog;
}