/**************************************************************************
*
* 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 <keith@tungstengraphics.com>
*/
#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;
}