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/**************************************************************************

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * 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, sub license, 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 (including the

 * next paragraph) 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 NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "util/u_math.h"

#include "util/u_memory.h"

#include "pipe/p_shader_tokens.h"

#include "draw_vs.h"

#include "draw_pipe.h"

/** subclass of draw_stage */

struct flat_stage

{

   struct draw_stage stage;

   uint num_color_attribs;

   uint color_attribs[2];  /* front/back primary colors */

   uint num_spec_attribs;

   uint spec_attribs[2];  /* front/back secondary colors */

};

#define COPY_3FV( DST, SRC )         \

do {                                \

   (DST)[0] = (SRC)[0];             \

   (DST)[1] = (SRC)[1];             \

   (DST)[2] = (SRC)[2];             \

} while (0)

static INLINE struct flat_stage *

flat_stage(struct draw_stage *stage)

{

   return (struct flat_stage *) stage;

}

/** Copy all the color attributes from 'src' vertex to 'dst' vertex */

static INLINE void copy_colors( struct draw_stage *stage,

                                struct vertex_header *dst,

                                const struct vertex_header *src )

{

   const struct flat_stage *flat = flat_stage(stage);

   uint i;

   for (i = 0; i < flat->num_color_attribs; i++) {

      const uint attr = flat->color_attribs[i];

      COPY_4FV(dst->data[attr], src->data[attr]);

   }

   for (i = 0; i < flat->num_spec_attribs; i++) {

      const uint attr = flat->spec_attribs[i];

      COPY_3FV(dst->data[attr], src->data[attr]);

   }

}

/** Copy all the color attributes from src vertex to dst0 & dst1 vertices */

static INLINE void copy_colors2( struct draw_stage *stage,

                                 struct vertex_header *dst0,

                                 struct vertex_header *dst1,

                                 const struct vertex_header *src )

{

   const struct flat_stage *flat = flat_stage(stage);

   uint i;

   for (i = 0; i < flat->num_color_attribs; i++) {

      const uint attr = flat->color_attribs[i];

      COPY_4FV(dst0->data[attr], src->data[attr]);

      COPY_4FV(dst1->data[attr], src->data[attr]);

   }

   for (i = 0; i < flat->num_spec_attribs; i++) {

      const uint attr = flat->spec_attribs[i];

      COPY_3FV(dst0->data[attr], src->data[attr]);

      COPY_3FV(dst1->data[attr], src->data[attr]);

   }

}

/**

 * Flatshade tri.  Required for clipping and when unfilled tris are

 * active, otherwise handled by hardware.

 */

static void flatshade_tri_0( struct draw_stage *stage,

                             struct prim_header *header )

{

   struct prim_header tmp;

   tmp.det = header->det;

   tmp.flags = header->flags;

   tmp.pad = header->pad;

   tmp.v[0] = header->v[0];

   tmp.v[1] = dup_vert(stage, header->v[1], 0);

   tmp.v[2] = dup_vert(stage, header->v[2], 1);

   copy_colors2(stage, tmp.v[1], tmp.v[2], tmp.v[0]);

   stage->next->tri( stage->next, &tmp );

}

static void flatshade_tri_2( struct draw_stage *stage,

                             struct prim_header *header )

{

   struct prim_header tmp;

   tmp.det = header->det;

   tmp.flags = header->flags;

   tmp.pad = header->pad;

   tmp.v[0] = dup_vert(stage, header->v[0], 0);

   tmp.v[1] = dup_vert(stage, header->v[1], 1);

   tmp.v[2] = header->v[2];

   copy_colors2(stage, tmp.v[0], tmp.v[1], tmp.v[2]);

   stage->next->tri( stage->next, &tmp );

}

/**

 * Flatshade line.  Required for clipping.

 */

static void flatshade_line_0( struct draw_stage *stage,

                              struct prim_header *header )

{

   struct prim_header tmp;

   tmp.v[0] = header->v[0];

   tmp.v[1] = dup_vert(stage, header->v[1], 0);

   copy_colors(stage, tmp.v[1], tmp.v[0]);

   stage->next->line( stage->next, &tmp );

}

static void flatshade_line_1( struct draw_stage *stage,

                              struct prim_header *header )

{

   struct prim_header tmp;

   tmp.v[0] = dup_vert(stage, header->v[0], 0);

   tmp.v[1] = header->v[1];

   copy_colors(stage, tmp.v[0], tmp.v[1]);

   stage->next->line( stage->next, &tmp );

}

static void flatshade_init_state( struct draw_stage *stage )

{

   struct flat_stage *flat = flat_stage(stage);

   const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader;

   uint i;

   /* Find which vertex shader outputs are colors, make a list */

   flat->num_color_attribs = 0;

   flat->num_spec_attribs = 0;

   for (i = 0; i < vs->info.num_outputs; i++) {

      if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_COLOR ||

          vs->info.output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {

         if (vs->info.output_semantic_index[i] == 0)

            flat->color_attribs[flat->num_color_attribs++] = i;

         else

            flat->spec_attribs[flat->num_spec_attribs++] = i;

      }

   }

   /* Choose flatshade routine according to provoking vertex:

    */

   if (stage->draw->rasterizer->flatshade_first) {

      stage->line = flatshade_line_0;

      stage->tri = flatshade_tri_0;

   }

   else {

      stage->line = flatshade_line_1;

      stage->tri = flatshade_tri_2;

   }

}

static void flatshade_first_tri( struct draw_stage *stage,

				 struct prim_header *header )

{

   flatshade_init_state( stage );

   stage->tri( stage, header );

}

static void flatshade_first_line( struct draw_stage *stage,

				  struct prim_header *header )

{

   flatshade_init_state( stage );

   stage->line( stage, header );

}

static void flatshade_flush( struct draw_stage *stage,

			     unsigned flags )

{

   stage->tri = flatshade_first_tri;

   stage->line = flatshade_first_line;

   stage->next->flush( stage->next, flags );

}

static void flatshade_reset_stipple_counter( struct draw_stage *stage )

{

   stage->next->reset_stipple_counter( stage->next );

}

static void flatshade_destroy( struct draw_stage *stage )

{

   draw_free_temp_verts( stage );

   FREE( stage );

}

/**

 * Create flatshading drawing stage.

 */

struct draw_stage *draw_flatshade_stage( struct draw_context *draw )

{

   struct flat_stage *flatshade = CALLOC_STRUCT(flat_stage);

   if (flatshade == NULL)

      goto fail;

   flatshade->stage.draw = draw;

   flatshade->stage.name = "flatshade";

   flatshade->stage.next = NULL;

   flatshade->stage.point = draw_pipe_passthrough_point;

   flatshade->stage.line = flatshade_first_line;

   flatshade->stage.tri = flatshade_first_tri;

   flatshade->stage.flush = flatshade_flush;

   flatshade->stage.reset_stipple_counter = flatshade_reset_stipple_counter;

   flatshade->stage.destroy = flatshade_destroy;

   if (!draw_alloc_temp_verts( &flatshade->stage, 2 ))

      goto fail;

   return &flatshade->stage;

 fail:

   if (flatshade)

      flatshade->stage.destroy( &flatshade->stage );

   return NULL;

}