forked from KolibriOS/kolibrios
227 lines
6.3 KiB
C
227 lines
6.3 KiB
C
/**************************************************************************
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*
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* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* \brief Drawing stage for handling glPolygonMode(line/point).
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* Convert triangles to points or lines as needed.
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*/
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/* Authors: Keith Whitwell <keith@tungstengraphics.com>
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*/
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#include "util/u_memory.h"
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#include "pipe/p_defines.h"
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#include "draw_private.h"
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#include "draw_pipe.h"
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struct unfilled_stage {
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struct draw_stage stage;
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/** [0] = front face, [1] = back face.
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* legal values: PIPE_POLYGON_MODE_FILL, PIPE_POLYGON_MODE_LINE,
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* and PIPE_POLYGON_MODE_POINT,
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*/
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unsigned mode[2];
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};
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static INLINE struct unfilled_stage *unfilled_stage( struct draw_stage *stage )
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{
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return (struct unfilled_stage *)stage;
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}
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static void point( struct draw_stage *stage,
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struct vertex_header *v0 )
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{
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struct prim_header tmp;
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tmp.v[0] = v0;
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stage->next->point( stage->next, &tmp );
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}
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static void line( struct draw_stage *stage,
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struct vertex_header *v0,
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struct vertex_header *v1 )
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{
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struct prim_header tmp;
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tmp.v[0] = v0;
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tmp.v[1] = v1;
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stage->next->line( stage->next, &tmp );
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}
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static void points( struct draw_stage *stage,
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struct prim_header *header )
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{
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struct vertex_header *v0 = header->v[0];
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struct vertex_header *v1 = header->v[1];
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struct vertex_header *v2 = header->v[2];
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if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) point( stage, v0 );
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if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) point( stage, v1 );
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if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) point( stage, v2 );
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}
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static void lines( struct draw_stage *stage,
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struct prim_header *header )
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{
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struct vertex_header *v0 = header->v[0];
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struct vertex_header *v1 = header->v[1];
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struct vertex_header *v2 = header->v[2];
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if (header->flags & DRAW_PIPE_RESET_STIPPLE)
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stage->next->reset_stipple_counter( stage->next );
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if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) line( stage, v2, v0 );
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if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) line( stage, v0, v1 );
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if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) line( stage, v1, v2 );
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}
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/** For debugging */
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static void
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print_header_flags(unsigned flags)
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{
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debug_printf("header->flags = ");
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if (flags & DRAW_PIPE_RESET_STIPPLE)
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debug_printf("RESET_STIPPLE ");
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if (flags & DRAW_PIPE_EDGE_FLAG_0)
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debug_printf("EDGE_FLAG_0 ");
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if (flags & DRAW_PIPE_EDGE_FLAG_1)
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debug_printf("EDGE_FLAG_1 ");
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if (flags & DRAW_PIPE_EDGE_FLAG_2)
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debug_printf("EDGE_FLAG_2 ");
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debug_printf("\n");
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}
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/* Unfilled tri:
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*
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* Note edgeflags in the vertex struct is not sufficient as we will
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* need to manipulate them when decomposing primitives.
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*
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* We currently keep the vertex edgeflag and primitive edgeflag mask
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* separate until the last possible moment.
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*/
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static void unfilled_tri( struct draw_stage *stage,
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struct prim_header *header )
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{
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struct unfilled_stage *unfilled = unfilled_stage(stage);
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unsigned cw = header->det >= 0.0;
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unsigned mode = unfilled->mode[cw];
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if (0)
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print_header_flags(header->flags);
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switch (mode) {
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case PIPE_POLYGON_MODE_FILL:
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stage->next->tri( stage->next, header );
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break;
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case PIPE_POLYGON_MODE_LINE:
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lines( stage, header );
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break;
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case PIPE_POLYGON_MODE_POINT:
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points( stage, header );
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break;
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default:
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assert(0);
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}
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}
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static void unfilled_first_tri( struct draw_stage *stage,
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struct prim_header *header )
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{
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struct unfilled_stage *unfilled = unfilled_stage(stage);
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const struct pipe_rasterizer_state *rast = stage->draw->rasterizer;
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unfilled->mode[0] = rast->front_ccw ? rast->fill_front : rast->fill_back;
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unfilled->mode[1] = rast->front_ccw ? rast->fill_back : rast->fill_front;
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stage->tri = unfilled_tri;
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stage->tri( stage, header );
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}
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static void unfilled_flush( struct draw_stage *stage,
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unsigned flags )
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{
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stage->next->flush( stage->next, flags );
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stage->tri = unfilled_first_tri;
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}
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static void unfilled_reset_stipple_counter( struct draw_stage *stage )
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{
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stage->next->reset_stipple_counter( stage->next );
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}
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static void unfilled_destroy( struct draw_stage *stage )
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{
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draw_free_temp_verts( stage );
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FREE( stage );
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}
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/**
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* Create unfilled triangle stage.
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*/
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struct draw_stage *draw_unfilled_stage( struct draw_context *draw )
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{
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struct unfilled_stage *unfilled = CALLOC_STRUCT(unfilled_stage);
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if (unfilled == NULL)
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goto fail;
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unfilled->stage.draw = draw;
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unfilled->stage.name = "unfilled";
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unfilled->stage.next = NULL;
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unfilled->stage.tmp = NULL;
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unfilled->stage.point = draw_pipe_passthrough_point;
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unfilled->stage.line = draw_pipe_passthrough_line;
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unfilled->stage.tri = unfilled_first_tri;
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unfilled->stage.flush = unfilled_flush;
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unfilled->stage.reset_stipple_counter = unfilled_reset_stipple_counter;
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unfilled->stage.destroy = unfilled_destroy;
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if (!draw_alloc_temp_verts( &unfilled->stage, 0 ))
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goto fail;
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return &unfilled->stage;
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fail:
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if (unfilled)
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unfilled->stage.destroy( &unfilled->stage );
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return NULL;
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}
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