441 lines
13 KiB
C
441 lines
13 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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* Copyright (C) 2010 LunarG Inc.
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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 "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Keith Whitwell <keith@tungstengraphics.com>
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* Chia-I Wu <olv@lunarg.com>
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*/
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/* these macros are optional */
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#ifndef LOCAL_VARS
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#define LOCAL_VARS
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#endif
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#ifndef FUNC_ENTER
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#define FUNC_ENTER do {} while (0)
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#endif
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#ifndef FUNC_EXIT
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#define FUNC_EXIT do {} while (0)
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#endif
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#ifndef LINE_ADJ
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#define LINE_ADJ(flags, a0, i0, i1, a1) LINE(flags, i0, i1)
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#endif
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#ifndef TRIANGLE_ADJ
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#define TRIANGLE_ADJ(flags, i0, a0, i1, a1, i2, a2) TRIANGLE(flags, i0, i1, i2)
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#endif
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static void
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FUNC(FUNC_VARS)
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{
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unsigned idx[6], i;
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ushort flags;
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LOCAL_VARS
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FUNC_ENTER;
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/* prim, prim_flags, count, and last_vertex_last should have been defined */
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if (0) {
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debug_printf("%s: prim 0x%x, prim_flags 0x%x, count %d, last_vertex_last %d\n",
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__FUNCTION__, prim, prim_flags, count, last_vertex_last);
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}
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switch (prim) {
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case PIPE_PRIM_POINTS:
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for (i = 0; i < count; i++) {
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idx[0] = GET_ELT(i);
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POINT(idx[0]);
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}
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break;
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case PIPE_PRIM_LINES:
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flags = DRAW_PIPE_RESET_STIPPLE;
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for (i = 0; i + 1 < count; i += 2) {
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idx[0] = GET_ELT(i);
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idx[1] = GET_ELT(i + 1);
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LINE(flags, idx[0], idx[1]);
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}
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break;
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case PIPE_PRIM_LINE_LOOP:
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case PIPE_PRIM_LINE_STRIP:
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if (count >= 2) {
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flags = (prim_flags & DRAW_SPLIT_BEFORE) ? 0 : DRAW_PIPE_RESET_STIPPLE;
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idx[1] = GET_ELT(0);
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idx[2] = idx[1];
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for (i = 1; i < count; i++, flags = 0) {
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idx[0] = idx[1];
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idx[1] = GET_ELT(i);
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LINE(flags, idx[0], idx[1]);
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}
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/* close the loop */
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if (prim == PIPE_PRIM_LINE_LOOP && !prim_flags)
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LINE(flags, idx[1], idx[2]);
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}
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break;
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case PIPE_PRIM_TRIANGLES:
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flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
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for (i = 0; i + 2 < count; i += 3) {
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idx[0] = GET_ELT(i);
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idx[1] = GET_ELT(i + 1);
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idx[2] = GET_ELT(i + 2);
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TRIANGLE(flags, idx[0], idx[1], idx[2]);
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}
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break;
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case PIPE_PRIM_TRIANGLE_STRIP:
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if (count >= 3) {
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flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
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idx[1] = GET_ELT(0);
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idx[2] = GET_ELT(1);
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if (last_vertex_last) {
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for (i = 0; i + 2 < count; i++) {
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idx[0] = idx[1];
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idx[1] = idx[2];
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idx[2] = GET_ELT(i + 2);
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/* always emit idx[2] last */
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if (i & 1)
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TRIANGLE(flags, idx[1], idx[0], idx[2]);
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else
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TRIANGLE(flags, idx[0], idx[1], idx[2]);
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}
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}
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else {
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for (i = 0; i + 2 < count; i++) {
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idx[0] = idx[1];
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idx[1] = idx[2];
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idx[2] = GET_ELT(i + 2);
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/* always emit idx[0] first */
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if (i & 1)
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TRIANGLE(flags, idx[0], idx[2], idx[1]);
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else
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TRIANGLE(flags, idx[0], idx[1], idx[2]);
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}
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}
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}
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break;
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case PIPE_PRIM_TRIANGLE_FAN:
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if (count >= 3) {
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flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
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idx[0] = GET_ELT(0);
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idx[2] = GET_ELT(1);
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/* idx[0] is neither the first nor the last vertex */
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if (last_vertex_last) {
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for (i = 0; i + 2 < count; i++) {
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idx[1] = idx[2];
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idx[2] = GET_ELT(i + 2);
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/* always emit idx[2] last */
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TRIANGLE(flags, idx[0], idx[1], idx[2]);
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}
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}
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else {
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for (i = 0; i + 2 < count; i++) {
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idx[1] = idx[2];
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idx[2] = GET_ELT(i + 2);
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/* always emit idx[1] first */
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TRIANGLE(flags, idx[1], idx[2], idx[0]);
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}
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}
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}
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break;
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case PIPE_PRIM_QUADS:
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if (last_vertex_last) {
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for (i = 0; i + 3 < count; i += 4) {
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idx[0] = GET_ELT(i);
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idx[1] = GET_ELT(i + 1);
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idx[2] = GET_ELT(i + 2);
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idx[3] = GET_ELT(i + 3);
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flags = DRAW_PIPE_RESET_STIPPLE |
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DRAW_PIPE_EDGE_FLAG_0 |
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DRAW_PIPE_EDGE_FLAG_2;
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/* always emit idx[3] last */
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TRIANGLE(flags, idx[0], idx[1], idx[3]);
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flags = DRAW_PIPE_EDGE_FLAG_0 |
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DRAW_PIPE_EDGE_FLAG_1;
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TRIANGLE(flags, idx[1], idx[2], idx[3]);
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}
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}
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else {
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for (i = 0; i + 3 < count; i += 4) {
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idx[0] = GET_ELT(i);
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idx[1] = GET_ELT(i + 1);
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idx[2] = GET_ELT(i + 2);
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idx[3] = GET_ELT(i + 3);
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flags = DRAW_PIPE_RESET_STIPPLE |
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DRAW_PIPE_EDGE_FLAG_0 |
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DRAW_PIPE_EDGE_FLAG_1;
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/* always emit idx[3] / idx[0] first */
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if (quads_flatshade_last)
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TRIANGLE(flags, idx[3], idx[0], idx[1]);
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else
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TRIANGLE(flags, idx[0], idx[1], idx[2]);
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flags = DRAW_PIPE_EDGE_FLAG_1 |
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DRAW_PIPE_EDGE_FLAG_2;
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if (quads_flatshade_last)
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TRIANGLE(flags, idx[3], idx[1], idx[2]);
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else
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TRIANGLE(flags, idx[0], idx[2], idx[3]);
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}
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}
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break;
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case PIPE_PRIM_QUAD_STRIP:
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if (count >= 4) {
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idx[2] = GET_ELT(0);
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idx[3] = GET_ELT(1);
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if (last_vertex_last) {
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for (i = 0; i + 3 < count; i += 2) {
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idx[0] = idx[2];
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idx[1] = idx[3];
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idx[2] = GET_ELT(i + 2);
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idx[3] = GET_ELT(i + 3);
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/* always emit idx[3] last */
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flags = DRAW_PIPE_RESET_STIPPLE |
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DRAW_PIPE_EDGE_FLAG_0 |
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DRAW_PIPE_EDGE_FLAG_2;
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TRIANGLE(flags, idx[2], idx[0], idx[3]);
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flags = DRAW_PIPE_EDGE_FLAG_0 |
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DRAW_PIPE_EDGE_FLAG_1;
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TRIANGLE(flags, idx[0], idx[1], idx[3]);
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}
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}
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else {
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for (i = 0; i + 3 < count; i += 2) {
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idx[0] = idx[2];
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idx[1] = idx[3];
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idx[2] = GET_ELT(i + 2);
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idx[3] = GET_ELT(i + 3);
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flags = DRAW_PIPE_RESET_STIPPLE |
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DRAW_PIPE_EDGE_FLAG_0 |
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DRAW_PIPE_EDGE_FLAG_1;
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/* always emit idx[3] / idx[0 first */
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if (quads_flatshade_last)
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TRIANGLE(flags, idx[3], idx[2], idx[0]);
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else
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TRIANGLE(flags, idx[0], idx[3], idx[2]);
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flags = DRAW_PIPE_EDGE_FLAG_1 |
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DRAW_PIPE_EDGE_FLAG_2;
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if (quads_flatshade_last)
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TRIANGLE(flags, idx[3], idx[0], idx[1]);
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else
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TRIANGLE(flags, idx[0], idx[1], idx[3]);
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}
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}
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}
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break;
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case PIPE_PRIM_POLYGON:
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if (count >= 3) {
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ushort edge_next, edge_finish;
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if (last_vertex_last) {
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flags = (DRAW_PIPE_RESET_STIPPLE |
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DRAW_PIPE_EDGE_FLAG_0);
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if (!(prim_flags & DRAW_SPLIT_BEFORE))
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flags |= DRAW_PIPE_EDGE_FLAG_2;
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edge_next = DRAW_PIPE_EDGE_FLAG_0;
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edge_finish =
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(prim_flags & DRAW_SPLIT_AFTER) ? 0 : DRAW_PIPE_EDGE_FLAG_1;
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}
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else {
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flags = (DRAW_PIPE_RESET_STIPPLE |
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DRAW_PIPE_EDGE_FLAG_1);
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if (!(prim_flags & DRAW_SPLIT_BEFORE))
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flags |= DRAW_PIPE_EDGE_FLAG_0;
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edge_next = DRAW_PIPE_EDGE_FLAG_1;
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edge_finish =
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(prim_flags & DRAW_SPLIT_AFTER) ? 0 : DRAW_PIPE_EDGE_FLAG_2;
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}
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idx[0] = GET_ELT(0);
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idx[2] = GET_ELT(1);
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for (i = 0; i + 2 < count; i++, flags = edge_next) {
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idx[1] = idx[2];
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idx[2] = GET_ELT(i + 2);
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if (i + 3 == count)
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flags |= edge_finish;
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/* idx[0] is both the first and the last vertex */
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if (last_vertex_last)
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TRIANGLE(flags, idx[1], idx[2], idx[0]);
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else
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TRIANGLE(flags, idx[0], idx[1], idx[2]);
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}
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}
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break;
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case PIPE_PRIM_LINES_ADJACENCY:
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flags = DRAW_PIPE_RESET_STIPPLE;
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for (i = 0; i + 3 < count; i += 4) {
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idx[0] = GET_ELT(i);
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idx[1] = GET_ELT(i + 1);
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idx[2] = GET_ELT(i + 2);
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idx[3] = GET_ELT(i + 3);
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LINE_ADJ(flags, idx[0], idx[1], idx[2], idx[3]);
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}
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break;
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case PIPE_PRIM_LINE_STRIP_ADJACENCY:
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if (count >= 4) {
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flags = (prim_flags & DRAW_SPLIT_BEFORE) ? 0 : DRAW_PIPE_RESET_STIPPLE;
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idx[1] = GET_ELT(0);
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idx[2] = GET_ELT(1);
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idx[3] = GET_ELT(2);
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for (i = 1; i + 2 < count; i++, flags = 0) {
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idx[0] = idx[1];
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idx[1] = idx[2];
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idx[2] = idx[3];
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idx[3] = GET_ELT(i + 2);
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LINE_ADJ(flags, idx[0], idx[1], idx[2], idx[3]);
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}
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}
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break;
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case PIPE_PRIM_TRIANGLES_ADJACENCY:
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flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
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for (i = 0; i + 5 < count; i += 6) {
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idx[0] = GET_ELT(i);
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idx[1] = GET_ELT(i + 1);
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idx[2] = GET_ELT(i + 2);
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idx[3] = GET_ELT(i + 3);
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idx[4] = GET_ELT(i + 4);
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idx[5] = GET_ELT(i + 5);
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TRIANGLE_ADJ(flags, idx[0], idx[1], idx[2], idx[3], idx[4], idx[5]);
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}
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break;
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case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
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if (count >= 6) {
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flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
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idx[0] = GET_ELT(1);
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idx[2] = GET_ELT(0);
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idx[4] = GET_ELT(2);
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idx[3] = GET_ELT(4);
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/*
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* The vertices of the i-th triangle are stored in
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* idx[0,2,4] = { 2*i, 2*i+2, 2*i+4 };
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*
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* The adjacent vertices are stored in
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* idx[1,3,5] = { 2*i-2, 2*i+6, 2*i+3 }.
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*
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* However, there are two exceptions:
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*
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* For the first triangle, idx[1] = 1;
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* For the last triangle, idx[3] = 2*i+5.
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*/
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if (last_vertex_last) {
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for (i = 0; i + 5 < count; i += 2) {
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idx[1] = idx[0];
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idx[0] = idx[2];
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idx[2] = idx[4];
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idx[4] = idx[3];
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idx[3] = GET_ELT(i + ((i + 7 < count) ? 6 : 5));
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idx[5] = GET_ELT(i + 3);
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/*
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* alternate the first two vertices (idx[0] and idx[2]) and the
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* corresponding adjacent vertices (idx[3] and idx[5]) to have
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* the correct orientation
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*/
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if (i & 2) {
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TRIANGLE_ADJ(flags,
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idx[2], idx[1], idx[0], idx[5], idx[4], idx[3]);
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}
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else {
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TRIANGLE_ADJ(flags,
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idx[0], idx[1], idx[2], idx[3], idx[4], idx[5]);
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}
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}
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}
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else {
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for (i = 0; i + 5 < count; i += 2) {
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idx[1] = idx[0];
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idx[0] = idx[2];
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idx[2] = idx[4];
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idx[4] = idx[3];
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idx[3] = GET_ELT(i + ((i + 7 < count) ? 6 : 5));
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idx[5] = GET_ELT(i + 3);
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/*
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* alternate the last two vertices (idx[2] and idx[4]) and the
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* corresponding adjacent vertices (idx[1] and idx[5]) to have
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* the correct orientation
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*/
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if (i & 2) {
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TRIANGLE_ADJ(flags,
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idx[0], idx[5], idx[4], idx[3], idx[2], idx[1]);
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}
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else {
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TRIANGLE_ADJ(flags,
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idx[0], idx[1], idx[2], idx[3], idx[4], idx[5]);
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}
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}
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}
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}
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break;
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default:
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assert(0);
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break;
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}
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FUNC_EXIT;
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}
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#undef LOCAL_VARS
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#undef FUNC_ENTER
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#undef FUNC_EXIT
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#undef LINE_ADJ
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#undef TRIANGLE_ADJ
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#undef FUNC
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#undef FUNC_VARS
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#undef GET_ELT
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#undef POINT
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#undef LINE
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#undef TRIANGLE
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