102 lines
2.8 KiB
C
102 lines
2.8 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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* Authors:
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* Keith Whitwell <keith@tungstengraphics.com>
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*/
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#include "draw/draw_context.h"
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#include "draw/draw_private.h"
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#include "draw/draw_pt.h"
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#include "util/u_debug.h"
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void draw_pt_split_prim(unsigned prim, unsigned *first, unsigned *incr)
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{
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switch (prim) {
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case PIPE_PRIM_POINTS:
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*first = 1;
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*incr = 1;
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break;
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case PIPE_PRIM_LINES:
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*first = 2;
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*incr = 2;
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break;
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case PIPE_PRIM_LINE_STRIP:
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case PIPE_PRIM_LINE_LOOP:
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*first = 2;
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*incr = 1;
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break;
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case PIPE_PRIM_LINES_ADJACENCY:
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*first = 4;
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*incr = 4;
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break;
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case PIPE_PRIM_LINE_STRIP_ADJACENCY:
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*first = 4;
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*incr = 1;
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break;
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case PIPE_PRIM_TRIANGLES:
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*first = 3;
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*incr = 3;
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break;
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case PIPE_PRIM_TRIANGLES_ADJACENCY:
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*first = 6;
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*incr = 6;
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break;
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case PIPE_PRIM_TRIANGLE_STRIP:
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case PIPE_PRIM_TRIANGLE_FAN:
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case PIPE_PRIM_POLYGON:
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*first = 3;
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*incr = 1;
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break;
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case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
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*first = 6;
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*incr = 2;
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break;
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case PIPE_PRIM_QUADS:
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*first = 4;
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*incr = 4;
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break;
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case PIPE_PRIM_QUAD_STRIP:
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*first = 4;
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*incr = 2;
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break;
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default:
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assert(0);
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*first = 0;
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*incr = 1; /* set to one so that count % incr works */
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break;
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}
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}
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unsigned draw_pt_trim_count(unsigned count, unsigned first, unsigned incr)
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{
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if (count < first)
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return 0;
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return count - (count - first) % incr;
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}
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