| /************************************************************************** |
| * |
| * 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 <keith@tungstengraphics.com> |
| */ |
| |
| #include "util/u_memory.h" |
| #include "pipe/p_defines.h" |
| #include "draw_private.h" |
| #include "draw_pipe.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]; |
| }; |
| |
| |
| static INLINE struct unfilled_stage *unfilled_stage( struct draw_stage *stage ) |
| { |
| return (struct unfilled_stage *)stage; |
| } |
| |
| |
| |
| 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]; |
| |
| 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 ); |
| |
| 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 ); |
| } |
| |
| |
| /** |
| * 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; |
| |
| if (!draw_alloc_temp_verts( &unfilled->stage, 0 )) |
| goto fail; |
| |
| return &unfilled->stage; |
| |
| fail: |
| if (unfilled) |
| unfilled->stage.destroy( &unfilled->stage ); |
| |
| return NULL; |
| } |