1 /************************************************************************** 2 * 3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 /* Authors: Keith Whitwell <keith (at) tungstengraphics.com> 29 */ 30 31 #include "util/u_math.h" 32 #include "util/u_memory.h" 33 34 #include "pipe/p_shader_tokens.h" 35 #include "draw_vs.h" 36 #include "draw_pipe.h" 37 38 39 /** subclass of draw_stage */ 40 struct flat_stage 41 { 42 struct draw_stage stage; 43 44 uint num_color_attribs; 45 uint color_attribs[2]; /* front/back primary colors */ 46 47 uint num_spec_attribs; 48 uint spec_attribs[2]; /* front/back secondary colors */ 49 }; 50 51 #define COPY_3FV( DST, SRC ) \ 52 do { \ 53 (DST)[0] = (SRC)[0]; \ 54 (DST)[1] = (SRC)[1]; \ 55 (DST)[2] = (SRC)[2]; \ 56 } while (0) 57 58 59 static INLINE struct flat_stage * 60 flat_stage(struct draw_stage *stage) 61 { 62 return (struct flat_stage *) stage; 63 } 64 65 66 /** Copy all the color attributes from 'src' vertex to 'dst' vertex */ 67 static INLINE void copy_colors( struct draw_stage *stage, 68 struct vertex_header *dst, 69 const struct vertex_header *src ) 70 { 71 const struct flat_stage *flat = flat_stage(stage); 72 uint i; 73 74 for (i = 0; i < flat->num_color_attribs; i++) { 75 const uint attr = flat->color_attribs[i]; 76 COPY_4FV(dst->data[attr], src->data[attr]); 77 } 78 79 for (i = 0; i < flat->num_spec_attribs; i++) { 80 const uint attr = flat->spec_attribs[i]; 81 COPY_3FV(dst->data[attr], src->data[attr]); 82 } 83 } 84 85 86 /** Copy all the color attributes from src vertex to dst0 & dst1 vertices */ 87 static INLINE void copy_colors2( struct draw_stage *stage, 88 struct vertex_header *dst0, 89 struct vertex_header *dst1, 90 const struct vertex_header *src ) 91 { 92 const struct flat_stage *flat = flat_stage(stage); 93 uint i; 94 for (i = 0; i < flat->num_color_attribs; i++) { 95 const uint attr = flat->color_attribs[i]; 96 COPY_4FV(dst0->data[attr], src->data[attr]); 97 COPY_4FV(dst1->data[attr], src->data[attr]); 98 } 99 100 for (i = 0; i < flat->num_spec_attribs; i++) { 101 const uint attr = flat->spec_attribs[i]; 102 COPY_3FV(dst0->data[attr], src->data[attr]); 103 COPY_3FV(dst1->data[attr], src->data[attr]); 104 } 105 } 106 107 108 /** 109 * Flatshade tri. Required for clipping and when unfilled tris are 110 * active, otherwise handled by hardware. 111 */ 112 static void flatshade_tri_0( struct draw_stage *stage, 113 struct prim_header *header ) 114 { 115 struct prim_header tmp; 116 117 tmp.det = header->det; 118 tmp.flags = header->flags; 119 tmp.pad = header->pad; 120 tmp.v[0] = header->v[0]; 121 tmp.v[1] = dup_vert(stage, header->v[1], 0); 122 tmp.v[2] = dup_vert(stage, header->v[2], 1); 123 124 copy_colors2(stage, tmp.v[1], tmp.v[2], tmp.v[0]); 125 126 stage->next->tri( stage->next, &tmp ); 127 } 128 129 130 static void flatshade_tri_2( struct draw_stage *stage, 131 struct prim_header *header ) 132 { 133 struct prim_header tmp; 134 135 tmp.det = header->det; 136 tmp.flags = header->flags; 137 tmp.pad = header->pad; 138 tmp.v[0] = dup_vert(stage, header->v[0], 0); 139 tmp.v[1] = dup_vert(stage, header->v[1], 1); 140 tmp.v[2] = header->v[2]; 141 142 copy_colors2(stage, tmp.v[0], tmp.v[1], tmp.v[2]); 143 144 stage->next->tri( stage->next, &tmp ); 145 } 146 147 148 149 150 151 /** 152 * Flatshade line. Required for clipping. 153 */ 154 static void flatshade_line_0( struct draw_stage *stage, 155 struct prim_header *header ) 156 { 157 struct prim_header tmp; 158 159 tmp.v[0] = header->v[0]; 160 tmp.v[1] = dup_vert(stage, header->v[1], 0); 161 162 copy_colors(stage, tmp.v[1], tmp.v[0]); 163 164 stage->next->line( stage->next, &tmp ); 165 } 166 167 static void flatshade_line_1( struct draw_stage *stage, 168 struct prim_header *header ) 169 { 170 struct prim_header tmp; 171 172 tmp.v[0] = dup_vert(stage, header->v[0], 0); 173 tmp.v[1] = header->v[1]; 174 175 copy_colors(stage, tmp.v[0], tmp.v[1]); 176 177 stage->next->line( stage->next, &tmp ); 178 } 179 180 181 182 183 static void flatshade_init_state( struct draw_stage *stage ) 184 { 185 struct flat_stage *flat = flat_stage(stage); 186 const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader; 187 uint i; 188 189 /* Find which vertex shader outputs are colors, make a list */ 190 flat->num_color_attribs = 0; 191 flat->num_spec_attribs = 0; 192 for (i = 0; i < vs->info.num_outputs; i++) { 193 if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_COLOR || 194 vs->info.output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) { 195 if (vs->info.output_semantic_index[i] == 0) 196 flat->color_attribs[flat->num_color_attribs++] = i; 197 else 198 flat->spec_attribs[flat->num_spec_attribs++] = i; 199 } 200 } 201 202 /* Choose flatshade routine according to provoking vertex: 203 */ 204 if (stage->draw->rasterizer->flatshade_first) { 205 stage->line = flatshade_line_0; 206 stage->tri = flatshade_tri_0; 207 } 208 else { 209 stage->line = flatshade_line_1; 210 stage->tri = flatshade_tri_2; 211 } 212 } 213 214 static void flatshade_first_tri( struct draw_stage *stage, 215 struct prim_header *header ) 216 { 217 flatshade_init_state( stage ); 218 stage->tri( stage, header ); 219 } 220 221 static void flatshade_first_line( struct draw_stage *stage, 222 struct prim_header *header ) 223 { 224 flatshade_init_state( stage ); 225 stage->line( stage, header ); 226 } 227 228 229 static void flatshade_flush( struct draw_stage *stage, 230 unsigned flags ) 231 { 232 stage->tri = flatshade_first_tri; 233 stage->line = flatshade_first_line; 234 stage->next->flush( stage->next, flags ); 235 } 236 237 238 static void flatshade_reset_stipple_counter( struct draw_stage *stage ) 239 { 240 stage->next->reset_stipple_counter( stage->next ); 241 } 242 243 244 static void flatshade_destroy( struct draw_stage *stage ) 245 { 246 draw_free_temp_verts( stage ); 247 FREE( stage ); 248 } 249 250 251 /** 252 * Create flatshading drawing stage. 253 */ 254 struct draw_stage *draw_flatshade_stage( struct draw_context *draw ) 255 { 256 struct flat_stage *flatshade = CALLOC_STRUCT(flat_stage); 257 if (flatshade == NULL) 258 goto fail; 259 260 flatshade->stage.draw = draw; 261 flatshade->stage.name = "flatshade"; 262 flatshade->stage.next = NULL; 263 flatshade->stage.point = draw_pipe_passthrough_point; 264 flatshade->stage.line = flatshade_first_line; 265 flatshade->stage.tri = flatshade_first_tri; 266 flatshade->stage.flush = flatshade_flush; 267 flatshade->stage.reset_stipple_counter = flatshade_reset_stipple_counter; 268 flatshade->stage.destroy = flatshade_destroy; 269 270 if (!draw_alloc_temp_verts( &flatshade->stage, 2 )) 271 goto fail; 272 273 return &flatshade->stage; 274 275 fail: 276 if (flatshade) 277 flatshade->stage.destroy( &flatshade->stage ); 278 279 return NULL; 280 } 281 282 283
