/************************************************************************** * * 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. * **************************************************************************/ /** * \brief Drawing stage for handling glPolygonMode(line/point). * Convert triangles to points or lines as needed. */ /* Authors: Keith Whitwell */ #include "util/u_memory.h" #include "pipe/p_defines.h" #include "draw_private.h" #include "draw_pipe.h" #include "draw_fs.h" struct unfilled_stage { struct draw_stage stage; /** [0] = front face, [1] = back face. * legal values: PIPE_POLYGON_MODE_FILL, PIPE_POLYGON_MODE_LINE, * and PIPE_POLYGON_MODE_POINT, */ unsigned mode[2]; int face_slot; }; static INLINE struct unfilled_stage *unfilled_stage( struct draw_stage *stage ) { return (struct unfilled_stage *)stage; } static void inject_front_face_info(struct draw_stage *stage, struct prim_header *header) { struct unfilled_stage *unfilled = unfilled_stage(stage); unsigned ccw = header->det < 0.0; boolean is_front_face = ( (stage->draw->rasterizer->front_ccw && ccw) || (!stage->draw->rasterizer->front_ccw && !ccw)); int slot = unfilled->face_slot; unsigned i; /* In case the backend doesn't care about it */ if (slot < 0) { return; } for (i = 0; i < 3; ++i) { struct vertex_header *v = header->v[i]; v->data[slot][0] = is_front_face; v->data[slot][1] = is_front_face; v->data[slot][2] = is_front_face; v->data[slot][3] = is_front_face; } } static void point( struct draw_stage *stage, struct vertex_header *v0 ) { struct prim_header tmp; tmp.v[0] = v0; stage->next->point( stage->next, &tmp ); } static void line( struct draw_stage *stage, struct vertex_header *v0, struct vertex_header *v1 ) { struct prim_header tmp; tmp.v[0] = v0; tmp.v[1] = v1; stage->next->line( stage->next, &tmp ); } static void points( struct draw_stage *stage, struct prim_header *header ) { struct vertex_header *v0 = header->v[0]; struct vertex_header *v1 = header->v[1]; struct vertex_header *v2 = header->v[2]; inject_front_face_info(stage, header); if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) point( stage, v0 ); if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) point( stage, v1 ); if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) point( stage, v2 ); } static void lines( struct draw_stage *stage, struct prim_header *header ) { struct vertex_header *v0 = header->v[0]; struct vertex_header *v1 = header->v[1]; struct vertex_header *v2 = header->v[2]; if (header->flags & DRAW_PIPE_RESET_STIPPLE) stage->next->reset_stipple_counter( stage->next ); inject_front_face_info(stage, header); if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) line( stage, v2, v0 ); if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) line( stage, v0, v1 ); if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) line( stage, v1, v2 ); } /** For debugging */ static void print_header_flags(unsigned flags) { debug_printf("header->flags = "); if (flags & DRAW_PIPE_RESET_STIPPLE) debug_printf("RESET_STIPPLE "); if (flags & DRAW_PIPE_EDGE_FLAG_0) debug_printf("EDGE_FLAG_0 "); if (flags & DRAW_PIPE_EDGE_FLAG_1) debug_printf("EDGE_FLAG_1 "); if (flags & DRAW_PIPE_EDGE_FLAG_2) debug_printf("EDGE_FLAG_2 "); debug_printf("\n"); } /* Unfilled tri: * * Note edgeflags in the vertex struct is not sufficient as we will * need to manipulate them when decomposing primitives. * * We currently keep the vertex edgeflag and primitive edgeflag mask * separate until the last possible moment. */ static void unfilled_tri( struct draw_stage *stage, struct prim_header *header ) { struct unfilled_stage *unfilled = unfilled_stage(stage); unsigned cw = header->det >= 0.0; unsigned mode = unfilled->mode[cw]; if (0) print_header_flags(header->flags); switch (mode) { case PIPE_POLYGON_MODE_FILL: stage->next->tri( stage->next, header ); break; case PIPE_POLYGON_MODE_LINE: lines( stage, header ); break; case PIPE_POLYGON_MODE_POINT: points( stage, header ); break; default: assert(0); } } static void unfilled_first_tri( struct draw_stage *stage, struct prim_header *header ) { struct unfilled_stage *unfilled = unfilled_stage(stage); const struct pipe_rasterizer_state *rast = stage->draw->rasterizer; unfilled->mode[0] = rast->front_ccw ? rast->fill_front : rast->fill_back; unfilled->mode[1] = rast->front_ccw ? rast->fill_back : rast->fill_front; stage->tri = unfilled_tri; stage->tri( stage, header ); } static void unfilled_flush( struct draw_stage *stage, unsigned flags ) { stage->next->flush( stage->next, flags ); stage->tri = unfilled_first_tri; } static void unfilled_reset_stipple_counter( struct draw_stage *stage ) { stage->next->reset_stipple_counter( stage->next ); } static void unfilled_destroy( struct draw_stage *stage ) { draw_free_temp_verts( stage ); FREE( stage ); } /* * Try to allocate an output slot which we can use * to preserve the front face information. */ void draw_unfilled_prepare_outputs( struct draw_context *draw, struct draw_stage *stage ) { struct unfilled_stage *unfilled = unfilled_stage(stage); const struct pipe_rasterizer_state *rast = draw ? draw->rasterizer : 0; boolean is_unfilled = (rast && (rast->fill_front != PIPE_POLYGON_MODE_FILL || rast->fill_back != PIPE_POLYGON_MODE_FILL)); const struct draw_fragment_shader *fs = draw ? draw->fs.fragment_shader : 0; if (is_unfilled && fs && fs->info.uses_frontface) { unfilled->face_slot = draw_alloc_extra_vertex_attrib( stage->draw, TGSI_SEMANTIC_FACE, 0); } else { unfilled->face_slot = -1; } } /** * Create unfilled triangle stage. */ struct draw_stage *draw_unfilled_stage( struct draw_context *draw ) { struct unfilled_stage *unfilled = CALLOC_STRUCT(unfilled_stage); if (unfilled == NULL) goto fail; unfilled->stage.draw = draw; unfilled->stage.name = "unfilled"; unfilled->stage.next = NULL; unfilled->stage.tmp = NULL; unfilled->stage.point = draw_pipe_passthrough_point; unfilled->stage.line = draw_pipe_passthrough_line; unfilled->stage.tri = unfilled_first_tri; unfilled->stage.flush = unfilled_flush; unfilled->stage.reset_stipple_counter = unfilled_reset_stipple_counter; unfilled->stage.destroy = unfilled_destroy; unfilled->face_slot = -1; if (!draw_alloc_temp_verts( &unfilled->stage, 0 )) goto fail; return &unfilled->stage; fail: if (unfilled) unfilled->stage.destroy( &unfilled->stage ); return NULL; }