--- /dev/null
+/*
+ * Mesa 3-D graphics library
+ * Version: 7.9
+ *
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * Copyright (C) 2010 LunarG Inc.
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ * Chia-I Wu <olv@lunarg.com>
+ */
+
+/* these macros are optional */
+#ifndef LOCAL_VARS
+#define LOCAL_VARS do {} while (0)
+#endif
+#ifndef FUNC_ENTER
+#define FUNC_ENTER do {} while (0)
+#endif
+#ifndef FUNC_EXIT
+#define FUNC_EXIT do {} while (0)
+#endif
+#ifndef LINE_ADJ
+#define LINE_ADJ(flags, a0, i0, i1, a1) LINE(flags, i0, i1)
+#endif
+#ifndef TRIANGLE_ADJ
+#define TRIANGLE_ADJ(flags, i0, a0, i1, a1, i2, a2) TRIANGLE(flags, i0, i1, i2)
+#endif
+
+static void
+FUNC(FUNC_VARS)
+{
+ unsigned idx[6], i;
+ ushort flags;
+ LOCAL_VARS;
+
+ FUNC_ENTER;
+
+ /* prim, count, and last_vertex_last should have been defined */
+ if (0) {
+ debug_printf("%s: prim 0x%x, count %d, last_vertex_last %d\n",
+ __FUNCTION__, prim, count, last_vertex_last);
+ }
+
+ switch (prim) {
+ case PIPE_PRIM_POINTS:
+ for (i = 0; i < count; i++) {
+ idx[0] = GET_ELT(i);
+ POINT(idx[0]);
+ }
+ break;
+
+ case PIPE_PRIM_LINES:
+ flags = DRAW_PIPE_RESET_STIPPLE;
+ for (i = 0; i + 1 < count; i += 2) {
+ idx[0] = GET_ELT(i);
+ idx[1] = GET_ELT(i + 1);
+ LINE(flags, idx[0], idx[1]);
+ }
+ break;
+
+ case PIPE_PRIM_LINE_LOOP:
+ case PIPE_PRIM_LINE_STRIP:
+ if (count >= 2) {
+ flags = DRAW_PIPE_RESET_STIPPLE;
+ idx[1] = GET_ELT(0);
+ idx[2] = idx[1];
+
+ for (i = 1; i < count; i++, flags = 0) {
+ idx[0] = idx[1];
+ idx[1] = GET_ELT(i);
+ LINE(flags, idx[0], idx[1]);
+ }
+ /* close the loop */
+ if (prim == PIPE_PRIM_LINE_LOOP)
+ LINE(flags, idx[1], idx[2]);
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLES:
+ flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+ for (i = 0; i + 2 < count; i += 3) {
+ idx[0] = GET_ELT(i);
+ idx[1] = GET_ELT(i + 1);
+ idx[2] = GET_ELT(i + 2);
+ TRIANGLE(flags, idx[0], idx[1], idx[2]);
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLE_STRIP:
+ if (count >= 3) {
+ flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+ idx[1] = GET_ELT(0);
+ idx[2] = GET_ELT(1);
+
+ if (last_vertex_last) {
+ for (i = 0; i + 2 < count; i++) {
+ idx[0] = idx[1];
+ idx[1] = idx[2];
+ idx[2] = GET_ELT(i + 2);
+ /* always emit idx[2] last */
+ if (i & 1)
+ TRIANGLE(flags, idx[1], idx[0], idx[2]);
+ else
+ TRIANGLE(flags, idx[0], idx[1], idx[2]);
+ }
+ }
+ else {
+ for (i = 0; i + 2 < count; i++) {
+ idx[0] = idx[1];
+ idx[1] = idx[2];
+ idx[2] = GET_ELT(i + 2);
+ /* always emit idx[0] first */
+ if (i & 1)
+ TRIANGLE(flags, idx[0], idx[2], idx[1]);
+ else
+ TRIANGLE(flags, idx[0], idx[1], idx[2]);
+ }
+ }
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLE_FAN:
+ if (count >= 3) {
+ flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+ idx[0] = GET_ELT(0);
+ idx[2] = GET_ELT(1);
+
+ /* idx[0] is neither the first nor the last vertex */
+ if (last_vertex_last) {
+ for (i = 0; i + 2 < count; i++) {
+ idx[1] = idx[2];
+ idx[2] = GET_ELT(i + 2);
+ /* always emit idx[2] last */
+ TRIANGLE(flags, idx[0], idx[1], idx[2]);
+ }
+ }
+ else {
+ for (i = 0; i + 2 < count; i++) {
+ idx[1] = idx[2];
+ idx[2] = GET_ELT(i + 2);
+ /* always emit idx[1] first */
+ TRIANGLE(flags, idx[1], idx[2], idx[0]);
+ }
+ }
+ }
+ break;
+
+ case PIPE_PRIM_QUADS:
+ if (last_vertex_last) {
+ for (i = 0; i + 3 < count; i += 4) {
+ idx[0] = GET_ELT(i);
+ idx[1] = GET_ELT(i + 1);
+ idx[2] = GET_ELT(i + 2);
+ idx[3] = GET_ELT(i + 3);
+
+ flags = DRAW_PIPE_RESET_STIPPLE |
+ DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_2;
+ /* always emit idx[3] last */
+ TRIANGLE(flags, idx[0], idx[1], idx[3]);
+
+ flags = DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_1;
+ TRIANGLE(flags, idx[1], idx[2], idx[3]);
+ }
+ }
+ else {
+ for (i = 0; i + 3 < count; i += 4) {
+ idx[0] = GET_ELT(i);
+ idx[1] = GET_ELT(i + 1);
+ idx[2] = GET_ELT(i + 2);
+ idx[3] = GET_ELT(i + 3);
+
+ flags = DRAW_PIPE_RESET_STIPPLE |
+ DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_1;
+ /* XXX should always emit idx[0] first */
+ /* always emit idx[3] first */
+ TRIANGLE(flags, idx[3], idx[0], idx[1]);
+
+ flags = DRAW_PIPE_EDGE_FLAG_1 |
+ DRAW_PIPE_EDGE_FLAG_2;
+ TRIANGLE(flags, idx[3], idx[1], idx[2]);
+ }
+ }
+ break;
+
+ case PIPE_PRIM_QUAD_STRIP:
+ if (count >= 4) {
+ idx[2] = GET_ELT(0);
+ idx[3] = GET_ELT(1);
+
+ if (last_vertex_last) {
+ for (i = 0; i + 3 < count; i += 2) {
+ idx[0] = idx[2];
+ idx[1] = idx[3];
+ idx[2] = GET_ELT(i + 2);
+ idx[3] = GET_ELT(i + 3);
+
+ /* always emit idx[3] last */
+ flags = DRAW_PIPE_RESET_STIPPLE |
+ DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_2;
+ TRIANGLE(flags, idx[2], idx[0], idx[3]);
+
+ flags = DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_1;
+ TRIANGLE(flags, idx[0], idx[1], idx[3]);
+ }
+ }
+ else {
+ for (i = 0; i + 3 < count; i += 2) {
+ idx[0] = idx[2];
+ idx[1] = idx[3];
+ idx[2] = GET_ELT(i + 2);
+ idx[3] = GET_ELT(i + 3);
+
+ flags = DRAW_PIPE_RESET_STIPPLE |
+ DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_1;
+ /* XXX should always emit idx[0] first */
+ /* always emit idx[3] first */
+ TRIANGLE(flags, idx[3], idx[2], idx[0]);
+
+ flags = DRAW_PIPE_EDGE_FLAG_1 |
+ DRAW_PIPE_EDGE_FLAG_2;
+ TRIANGLE(flags, idx[3], idx[0], idx[1]);
+ }
+ }
+ }
+ break;
+
+ case PIPE_PRIM_POLYGON:
+ if (count >= 3) {
+ ushort edge_next, edge_finish;
+
+ if (last_vertex_last) {
+ flags = (DRAW_PIPE_RESET_STIPPLE |
+ DRAW_PIPE_EDGE_FLAG_2 |
+ DRAW_PIPE_EDGE_FLAG_0);
+ edge_next = DRAW_PIPE_EDGE_FLAG_0;
+ edge_finish = DRAW_PIPE_EDGE_FLAG_1;
+ }
+ else {
+ flags = (DRAW_PIPE_RESET_STIPPLE |
+ DRAW_PIPE_EDGE_FLAG_0 |
+ DRAW_PIPE_EDGE_FLAG_1);
+ edge_next = DRAW_PIPE_EDGE_FLAG_1;
+ edge_finish = DRAW_PIPE_EDGE_FLAG_2;
+ }
+
+ idx[0] = GET_ELT(0);
+ idx[2] = GET_ELT(1);
+
+ for (i = 0; i + 2 < count; i++, flags = edge_next) {
+ idx[1] = idx[2];
+ idx[2] = GET_ELT(i + 2);
+
+ if (i + 3 == count)
+ flags |= edge_finish;
+
+ /* idx[0] is both the first and the last vertex */
+ if (last_vertex_last)
+ TRIANGLE(flags, idx[1], idx[2], idx[0]);
+ else
+ TRIANGLE(flags, idx[0], idx[1], idx[2]);
+ }
+ }
+ break;
+
+ case PIPE_PRIM_LINES_ADJACENCY:
+ flags = DRAW_PIPE_RESET_STIPPLE;
+ for (i = 0; i + 3 < count; i += 4) {
+ idx[0] = GET_ELT(i);
+ idx[1] = GET_ELT(i + 1);
+ idx[2] = GET_ELT(i + 2);
+ idx[3] = GET_ELT(i + 3);
+ LINE_ADJ(flags, idx[0], idx[1], idx[2], idx[3]);
+ }
+ break;
+
+ case PIPE_PRIM_LINE_STRIP_ADJACENCY:
+ if (count >= 4) {
+ flags = DRAW_PIPE_RESET_STIPPLE;
+ idx[1] = GET_ELT(0);
+ idx[2] = GET_ELT(1);
+ idx[3] = GET_ELT(2);
+
+ for (i = 1; i + 2 < count; i++, flags = 0) {
+ idx[0] = idx[1];
+ idx[1] = idx[2];
+ idx[2] = idx[3];
+ idx[3] = GET_ELT(i + 2);
+ LINE_ADJ(flags, idx[0], idx[1], idx[2], idx[3]);
+ }
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLES_ADJACENCY:
+ flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+ for (i = 0; i + 5 < count; i += 6) {
+ idx[0] = GET_ELT(i);
+ idx[1] = GET_ELT(i + 1);
+ idx[2] = GET_ELT(i + 2);
+ idx[3] = GET_ELT(i + 3);
+ idx[4] = GET_ELT(i + 4);
+ idx[5] = GET_ELT(i + 5);
+ TRIANGLE_ADJ(flags, idx[0], idx[1], idx[2], idx[3], idx[4], idx[5]);
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
+ if (count >= 6) {
+ flags = DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL;
+ idx[0] = GET_ELT(1);
+ idx[2] = GET_ELT(0);
+ idx[4] = GET_ELT(2);
+ idx[3] = GET_ELT(4);
+
+ /*
+ * The vertices of the i-th triangle are stored in
+ * idx[0,2,4] = { 2*i, 2*i+2, 2*i+4 };
+ *
+ * The adjacent vertices are stored in
+ * idx[1,3,5] = { 2*i-2, 2*i+6, 2*i+3 }.
+ *
+ * However, there are two exceptions:
+ *
+ * For the first triangle, idx[1] = 1;
+ * For the last triangle, idx[3] = 2*i+5.
+ */
+ if (last_vertex_last) {
+ for (i = 0; i + 5 < count; i += 2) {
+ idx[1] = idx[0];
+
+ idx[0] = idx[2];
+ idx[2] = idx[4];
+ idx[4] = idx[3];
+
+ idx[3] = GET_ELT(i + ((i + 7 < count) ? 6 : 5));
+ idx[5] = GET_ELT(i + 3);
+
+ /*
+ * alternate the first two vertices (idx[0] and idx[2]) and the
+ * corresponding adjacent vertices (idx[3] and idx[5]) to have
+ * the correct orientation
+ */
+ if (i & 2) {
+ TRIANGLE_ADJ(flags,
+ idx[2], idx[1], idx[0], idx[5], idx[4], idx[3]);
+ }
+ else {
+ TRIANGLE_ADJ(flags,
+ idx[0], idx[1], idx[2], idx[3], idx[4], idx[5]);
+ }
+ }
+ }
+ else {
+ for (i = 0; i + 5 < count; i += 2) {
+ idx[1] = idx[0];
+
+ idx[0] = idx[2];
+ idx[2] = idx[4];
+ idx[4] = idx[3];
+
+ idx[3] = GET_ELT(i + ((i + 7 < count) ? 6 : 5));
+ idx[5] = GET_ELT(i + 3);
+
+ /*
+ * alternate the last two vertices (idx[2] and idx[4]) and the
+ * corresponding adjacent vertices (idx[1] and idx[5]) to have
+ * the correct orientation
+ */
+ if (i & 2) {
+ TRIANGLE_ADJ(flags,
+ idx[0], idx[5], idx[4], idx[3], idx[2], idx[1]);
+ }
+ else {
+ TRIANGLE_ADJ(flags,
+ idx[0], idx[1], idx[2], idx[3], idx[4], idx[5]);
+ }
+ }
+ }
+ }
+ break;
+
+ default:
+ assert(0);
+ break;
+ }
+
+ FUNC_EXIT;
+}
+
+#undef LOCAL_VARS
+#undef FUNC_ENTER
+#undef FUNC_EXIT
+#undef LINE_ADJ
+#undef TRIANGLE_ADJ
+
+#undef FUNC
+#undef FUNC_VARS
+#undef GET_ELT
+#undef POINT
+#undef LINE
+#undef TRIANGLE
projects / mesa.git / commitdiff