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/*

 * Mesa 3-D graphics library

 * Version:  6.5.3

 *

 * Copyright (C) 1999-2007  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 

 */

#include "main/glheader.h"

#include "main/context.h"

#include "main/imports.h"

#include "main/mtypes.h"

#include "t_context.h"

#include "t_pipeline.h"

#include "t_vp_build.h"

#include "t_vertex.h"

void _tnl_install_pipeline( struct gl_context *ctx,

			    const struct tnl_pipeline_stage **stages )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   GLuint i;

   tnl->pipeline.new_state = ~0;

   /* Create a writeable copy of each stage.

    */

   for (i = 0 ; i < MAX_PIPELINE_STAGES && stages[i] ; i++) {

      struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];

      memcpy(s, stages[i], sizeof(*s));

      if (s->create)

	 s->create(ctx, s);

   }

   tnl->pipeline.nr_stages = i;

}

void _tnl_destroy_pipeline( struct gl_context *ctx )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   GLuint i;

   for (i = 0 ; i < tnl->pipeline.nr_stages ; i++) {

      struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];

      if (s->destroy)

	 s->destroy(s);

   }

   tnl->pipeline.nr_stages = 0;

}

static GLuint check_input_changes( struct gl_context *ctx )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   GLuint i;

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

      if (tnl->vb.AttribPtr[i]->size != tnl->pipeline.last_attrib_size[i] ||

	  tnl->vb.AttribPtr[i]->stride != tnl->pipeline.last_attrib_stride[i]) {

	 tnl->pipeline.last_attrib_size[i] = tnl->vb.AttribPtr[i]->size;

	 tnl->pipeline.last_attrib_stride[i] = tnl->vb.AttribPtr[i]->stride;

	 tnl->pipeline.input_changes |= 1<

      }

   }

   return tnl->pipeline.input_changes;

}

static GLuint check_output_changes( struct gl_context *ctx )

{

#if 0

   TNLcontext *tnl = TNL_CONTEXT(ctx);

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

      if (tnl->vb.ResultPtr[i]->size != tnl->last_result_size[i] ||

	  tnl->vb.ResultPtr[i]->stride != tnl->last_result_stride[i]) {

	 tnl->last_result_size[i] = tnl->vb.ResultPtr[i]->size;

	 tnl->last_result_stride[i] = tnl->vb.ResultPtr[i]->stride;

	 tnl->pipeline.output_changes |= 1<

      }

   }

   if (tnl->pipeline.output_changes)

      tnl->Driver.NotifyOutputChanges( ctx, tnl->pipeline.output_changes );

   return tnl->pipeline.output_changes;

#else

   return ~0;

#endif

}

void _tnl_run_pipeline( struct gl_context *ctx )

{

   TNLcontext *tnl = TNL_CONTEXT(ctx);

   unsigned short __tmp;

   GLuint i;

   if (!tnl->vb.Count)

      return;

   /* Check for changed input sizes or change in stride to/from zero

    * (ie const or non-const).

    */

   if (check_input_changes( ctx ) || tnl->pipeline.new_state) {

      if (ctx->VertexProgram._MaintainTnlProgram)

	 _tnl_UpdateFixedFunctionProgram( ctx );

      for (i = 0; i < tnl->pipeline.nr_stages ; i++) {

	 struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];

	 if (s->validate)

	    s->validate( ctx, s );

      }

      tnl->pipeline.new_state = 0;

      tnl->pipeline.input_changes = 0;

      /* Pipeline can only change its output in response to either a

       * statechange or an input size/stride change.  No other changes

       * are allowed.

       */

      if (check_output_changes( ctx ))

	 _tnl_notify_pipeline_output_change( ctx );

   }

   START_FAST_MATH(__tmp);

   for (i = 0; i < tnl->pipeline.nr_stages ; i++) {

      struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];

      if (!s->run( ctx, s ))

	 break;

   }

   END_FAST_MATH(__tmp);

}

/* The default pipeline.  This is useful for software rasterizers, and

 * simple hardware rasterizers.  For customization, I don't recommend

 * tampering with the internals of these stages in the way that

 * drivers did in Mesa 3.4.  These stages are basically black boxes,

 * and should be left intact.

 *

 * To customize the pipeline, consider:

 *

 * - removing redundant stages (making sure that the software rasterizer

 *   can cope with this on fallback paths).  An example is fog

 *   coordinate generation, which is not required in the FX driver.

 *

 * - replacing general-purpose machine-independent stages with

 *   general-purpose machine-specific stages.  There is no example of

 *   this to date, though it must be borne in mind that all subsequent

 *   stages that reference the output of the new stage must cope with

 *   any machine-specific data introduced.  This may not be easy

 *   unless there are no such stages (ie the new stage is the last in

 *   the pipe).

 *

 * - inserting optimized (but specialized) stages ahead of the

 *   general-purpose fallback implementation.  For example, the old

 *   fastpath mechanism, which only works when the VB->Elts input is

 *   available, can be duplicated by placing the fastpath stage at the

 *   head of this pipeline.  Such specialized stages are currently

 *   constrained to have no outputs (ie. they must either finish the *

 *   pipeline by returning GL_FALSE from run(), or do nothing).

 *

 * Some work can be done to lift some of the restrictions in the final

 * case, if it becomes necessary to do so.

 */

const struct tnl_pipeline_stage *_tnl_default_pipeline[] = {

   &_tnl_vertex_transform_stage,

   &_tnl_normal_transform_stage,

   &_tnl_lighting_stage,

   &_tnl_texgen_stage,

   &_tnl_texture_transform_stage,

   &_tnl_point_attenuation_stage,

   &_tnl_vertex_program_stage,

   &_tnl_fog_coordinate_stage,

   &_tnl_render_stage,

   NULL

};

const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = {

   &_tnl_vertex_program_stage,

   &_tnl_render_stage,

   NULL

};