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/*

 * Mesa 3-D graphics library

 *

 * Copyright (C) 1999-2008  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 

 */

#include "main/glheader.h"

#include "main/imports.h"

#include "main/context.h"

#include "main/macros.h"

#include "main/mtypes.h"

#include "main/light.h"

#include "math/m_translate.h"

#include "math/m_xform.h"

#include "main/state.h"

#include "tnl.h"

#include "t_context.h"

#include "t_pipeline.h"

#include "vbo/vbo.h"

GLboolean

_tnl_CreateContext( struct gl_context *ctx )

{

   TNLcontext *tnl;

   GLuint i;

   /* Create the TNLcontext structure

    */

   ctx->swtnl_context = tnl = calloc(1, sizeof(TNLcontext));

   if (!tnl) {

      return GL_FALSE;

   }

   /* Initialize the VB.

    */

   tnl->vb.Size = ctx->Const.MaxArrayLockSize + MAX_CLIPPED_VERTICES;

   /* Initialize tnl state.

    */

   if (ctx->VertexProgram._MaintainTnlProgram) {

      _tnl_install_pipeline( ctx, _tnl_vp_pipeline );

   } else {

      _tnl_install_pipeline( ctx, _tnl_default_pipeline );

   }

   tnl->NeedNdcCoords = GL_TRUE;

   tnl->AllowVertexFog = GL_TRUE;

   tnl->AllowPixelFog = GL_TRUE;

   /* Set a few default values in the driver struct.

    */

   tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;

   tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;

   tnl->Driver.NotifyMaterialChange = _tnl_validate_shine_tables;

   tnl->nr_blocks = 0;

   /* Lighting miscellaneous */

   tnl->_ShineTabList = MALLOC_STRUCT( tnl_shine_tab );

   make_empty_list( tnl->_ShineTabList );

   /* Allocate 10 (arbitrary) shininess lookup tables */

   for (i = 0 ; i < 10 ; i++) {

      struct tnl_shine_tab *s = MALLOC_STRUCT( tnl_shine_tab );

      s->shininess = -1;

      s->refcount = 0;

      insert_at_tail( tnl->_ShineTabList, s );

   }

   /* plug in the VBO drawing function */

   vbo_set_draw_func(ctx, _tnl_vbo_draw_prims);

   _math_init_transformation();

   _math_init_translate();

   return GL_TRUE;

}

void

_tnl_DestroyContext( struct gl_context *ctx )

{

   struct tnl_shine_tab *s, *tmps;

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   /* Free lighting shininess exponentiation table */

   foreach_s( s, tmps, tnl->_ShineTabList ) {

      free( s );

   }

   free( tnl->_ShineTabList );

   _tnl_destroy_pipeline( ctx );

   free(tnl);

   ctx->swtnl_context = NULL;

}

void

_tnl_InvalidateState( struct gl_context *ctx, GLuint new_state )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   const struct gl_vertex_program *vp = ctx->VertexProgram._Current;

   const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;

   GLuint i;

   if (new_state & (_NEW_HINT | _NEW_PROGRAM)) {

      ASSERT(tnl->AllowVertexFog || tnl->AllowPixelFog);

      tnl->_DoVertexFog = ((tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST))

         || !tnl->AllowPixelFog) && !fp;

   }

   tnl->pipeline.new_state |= new_state;

   /* Calculate tnl->render_inputs.  This bitmask indicates which vertex

    * attributes need to be emitted to the rasterizer.

    */

   tnl->render_inputs_bitset = BITFIELD64_BIT(_TNL_ATTRIB_POS);

   if (!fp || (fp->Base.InputsRead & VARYING_BIT_COL0)) {

     tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_COLOR0);

   }

   if (_mesa_need_secondary_color(ctx))

     tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_COLOR1);

   for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {

     if (ctx->Texture._EnabledCoordUnits & (1 << i) ||

	 (fp && fp->Base.InputsRead & VARYING_BIT_TEX(i))) {

       tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_TEX(i));

     }

   }

   if (ctx->Fog.Enabled

       || (fp != NULL && (fp->Base.InputsRead & VARYING_BIT_FOGC) != 0)) {

      /* Either fixed-function fog or a fragment program needs fog coord.

       */

      tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_FOG);

   }

   if (ctx->Polygon.FrontMode != GL_FILL ||

       ctx->Polygon.BackMode != GL_FILL)

      tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_EDGEFLAG);

   if (ctx->RenderMode == GL_FEEDBACK)

      tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_TEX0);

   if (ctx->Point._Attenuated || ctx->VertexProgram.PointSizeEnabled)

      tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_POINTSIZE);

   /* check for varying vars which are written by the vertex program */

   if (vp) {

      GLuint i;

      for (i = 0; i < MAX_VARYING; i++) {

	 if (vp->Base.OutputsWritten & BITFIELD64_BIT(VARYING_SLOT_VAR0 + i)) {

            tnl->render_inputs_bitset |= BITFIELD64_BIT(_TNL_ATTRIB_GENERIC(i));

         }

      }

   }

}

void

_tnl_wakeup( struct gl_context *ctx )

{

   /* Assume we haven't been getting state updates either:

    */

   _tnl_InvalidateState( ctx, ~0 );

#if 0

   if (ctx->Light.ColorMaterialEnabled) {

      _mesa_update_color_material( ctx,

				   ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );

   }

#endif

}

/**

 * 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( struct gl_context *ctx, GLboolean mode )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl->NeedNdcCoords = mode;

}

void

_tnl_allow_vertex_fog( struct gl_context *ctx, GLboolean value )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl->AllowVertexFog = value;

   tnl->_DoVertexFog = ((tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST))

      || !tnl->AllowPixelFog) && !ctx->FragmentProgram._Current;

}

void

_tnl_allow_pixel_fog( struct gl_context *ctx, GLboolean value )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl->AllowPixelFog = value;

   tnl->_DoVertexFog = ((tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST))

      || !tnl->AllowPixelFog) && !ctx->FragmentProgram._Current;

}