diff options
Diffstat (limited to 'src/gallium/auxiliary/draw/draw_flatshade.c')
| -rw-r--r-- | src/gallium/auxiliary/draw/draw_flatshade.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_flatshade.c b/src/gallium/auxiliary/draw/draw_flatshade.c new file mode 100644 index 00000000000..4398abbc60c --- /dev/null +++ b/src/gallium/auxiliary/draw/draw_flatshade.c @@ -0,0 +1,205 @@ +/************************************************************************** + * + * 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 <[email protected]> + */ + +#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; +} + + |