| /************************************************************************** |
| * |
| * 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; |
| } |
| |
| |