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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. |
* |
**************************************************************************/ |
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/* Authors: Keith Whitwell <keith@tungstengraphics.com> |
*/ |
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#include "util/u_math.h" |
#include "util/u_memory.h" |
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#include "pipe/p_shader_tokens.h" |
#include "draw_vs.h" |
#include "draw_pipe.h" |
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/** subclass of draw_stage */ |
struct flat_stage |
{ |
struct draw_stage stage; |
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uint num_color_attribs; |
uint color_attribs[2]; /* front/back primary colors */ |
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uint num_spec_attribs; |
uint spec_attribs[2]; /* front/back secondary colors */ |
}; |
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#define COPY_3FV( DST, SRC ) \ |
do { \ |
(DST)[0] = (SRC)[0]; \ |
(DST)[1] = (SRC)[1]; \ |
(DST)[2] = (SRC)[2]; \ |
} while (0) |
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static INLINE struct flat_stage * |
flat_stage(struct draw_stage *stage) |
{ |
return (struct flat_stage *) stage; |
} |
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/** 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; |
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for (i = 0; i < flat->num_color_attribs; i++) { |
const uint attr = flat->color_attribs[i]; |
COPY_4FV(dst->data[attr], src->data[attr]); |
} |
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for (i = 0; i < flat->num_spec_attribs; i++) { |
const uint attr = flat->spec_attribs[i]; |
COPY_3FV(dst->data[attr], src->data[attr]); |
} |
} |
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/** 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]); |
} |
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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]); |
} |
} |
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/** |
* 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; |
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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); |
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copy_colors2(stage, tmp.v[1], tmp.v[2], tmp.v[0]); |
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stage->next->tri( stage->next, &tmp ); |
} |
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static void flatshade_tri_2( struct draw_stage *stage, |
struct prim_header *header ) |
{ |
struct prim_header tmp; |
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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]; |
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copy_colors2(stage, tmp.v[0], tmp.v[1], tmp.v[2]); |
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stage->next->tri( stage->next, &tmp ); |
} |
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/** |
* Flatshade line. Required for clipping. |
*/ |
static void flatshade_line_0( struct draw_stage *stage, |
struct prim_header *header ) |
{ |
struct prim_header tmp; |
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tmp.v[0] = header->v[0]; |
tmp.v[1] = dup_vert(stage, header->v[1], 0); |
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copy_colors(stage, tmp.v[1], tmp.v[0]); |
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stage->next->line( stage->next, &tmp ); |
} |
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static void flatshade_line_1( struct draw_stage *stage, |
struct prim_header *header ) |
{ |
struct prim_header tmp; |
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tmp.v[0] = dup_vert(stage, header->v[0], 0); |
tmp.v[1] = header->v[1]; |
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copy_colors(stage, tmp.v[0], tmp.v[1]); |
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stage->next->line( stage->next, &tmp ); |
} |
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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; |
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/* 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; |
} |
} |
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/* 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; |
} |
} |
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static void flatshade_first_tri( struct draw_stage *stage, |
struct prim_header *header ) |
{ |
flatshade_init_state( stage ); |
stage->tri( stage, header ); |
} |
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static void flatshade_first_line( struct draw_stage *stage, |
struct prim_header *header ) |
{ |
flatshade_init_state( stage ); |
stage->line( stage, header ); |
} |
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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 ); |
} |
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static void flatshade_reset_stipple_counter( struct draw_stage *stage ) |
{ |
stage->next->reset_stipple_counter( stage->next ); |
} |
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static void flatshade_destroy( struct draw_stage *stage ) |
{ |
draw_free_temp_verts( stage ); |
FREE( stage ); |
} |
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/** |
* 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; |
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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; |
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if (!draw_alloc_temp_verts( &flatshade->stage, 2 )) |
goto fail; |
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return &flatshade->stage; |
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fail: |
if (flatshade) |
flatshade->stage.destroy( &flatshade->stage ); |
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return NULL; |
} |
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