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Diffstat (limited to 'src/gallium/aux/draw/draw_flatshade.c')
-rw-r--r--src/gallium/aux/draw/draw_flatshade.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/src/gallium/aux/draw/draw_flatshade.c b/src/gallium/aux/draw/draw_flatshade.c
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+++ b/src/gallium/aux/draw/draw_flatshade.c
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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 <keith@tungstengraphics.com>
+ */
+
+#include "pipe/p_util.h"
+#include "pipe/p_shader_tokens.h"
+#include "draw_private.h"
+
+
+/** subclass of draw_stage */
+struct flat_stage
+{
+ struct draw_stage stage;
+
+ uint num_color_attribs;
+ uint color_attribs[4]; /* front/back primary/secondary colors */
+};
+
+
+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]);
+ }
+}
+
+
+/** 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]);
+ }
+}
+
+
+/**
+ * Flatshade tri. Required for clipping and when unfilled tris are
+ * active, otherwise handled by hardware.
+ */
+static void flatshade_tri( struct draw_stage *stage,
+ struct prim_header *header )
+{
+ struct prim_header tmp;
+
+ tmp.det = header->det;
+ tmp.edgeflags = header->edgeflags;
+ 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( 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_point( struct draw_stage *stage,
+ struct prim_header *header )
+{
+ stage->next->point( stage->next, header );
+}
+
+
+static void flatshade_init_state( struct draw_stage *stage )
+{
+ struct flat_stage *flat = flat_stage(stage);
+ const struct pipe_shader_state *vs = stage->draw->vertex_shader->state;
+ uint i;
+
+ /* Find which vertex shader outputs are colors, make a list */
+ flat->num_color_attribs = 0;
+ for (i = 0; i < vs->num_outputs; i++) {
+ if (vs->output_semantic_name[i] == TGSI_SEMANTIC_COLOR ||
+ vs->output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) {
+ flat->color_attribs[flat->num_color_attribs++] = i;
+ }
+ }
+
+ stage->line = flatshade_line;
+ stage->tri = flatshade_tri;
+}
+
+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);
+
+ draw_alloc_temp_verts( &flatshade->stage, 2 );
+
+ flatshade->stage.draw = draw;
+ flatshade->stage.next = NULL;
+ flatshade->stage.point = flatshade_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;
+
+ return &flatshade->stage;
+}
+
+
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