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Diffstat (limited to 'src/gallium/aux/draw/draw_prim.c')
-rw-r--r--src/gallium/aux/draw/draw_prim.c482
1 files changed, 482 insertions, 0 deletions
diff --git a/src/gallium/aux/draw/draw_prim.c b/src/gallium/aux/draw/draw_prim.c
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index 0000000000..51e2242719
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+++ b/src/gallium/aux/draw/draw_prim.c
@@ -0,0 +1,482 @@
+/**************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+ /*
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "pipe/p_debug.h"
+
+#include "draw_private.h"
+#include "draw_context.h"
+
+
+
+#define RP_NONE 0
+#define RP_POINT 1
+#define RP_LINE 2
+#define RP_TRI 3
+
+
+static unsigned reduced_prim[PIPE_PRIM_POLYGON + 1] = {
+ RP_POINT,
+ RP_LINE,
+ RP_LINE,
+ RP_LINE,
+ RP_TRI,
+ RP_TRI,
+ RP_TRI,
+ RP_TRI,
+ RP_TRI,
+ RP_TRI
+};
+
+
+static void draw_prim_queue_flush( struct draw_context *draw )
+{
+ unsigned i;
+
+ if (0)
+ debug_printf("Flushing with %d prims, %d verts\n",
+ draw->pq.queue_nr, draw->vs.queue_nr);
+
+ assert (draw->pq.queue_nr != 0);
+
+ /* NOTE: we cannot save draw->pipeline->first in a local var because
+ * draw->pipeline->first is often changed by the first call to tri(),
+ * line(), etc.
+ */
+ if (draw->rasterizer->line_stipple_enable) {
+ switch (draw->reduced_prim) {
+ case RP_TRI:
+ for (i = 0; i < draw->pq.queue_nr; i++) {
+ if (draw->pq.queue[i].reset_line_stipple)
+ draw->pipeline.first->reset_stipple_counter( draw->pipeline.first );
+
+ draw->pipeline.first->tri( draw->pipeline.first, &draw->pq.queue[i] );
+ }
+ break;
+ case RP_LINE:
+ for (i = 0; i < draw->pq.queue_nr; i++) {
+ if (draw->pq.queue[i].reset_line_stipple)
+ draw->pipeline.first->reset_stipple_counter( draw->pipeline.first );
+
+ draw->pipeline.first->line( draw->pipeline.first, &draw->pq.queue[i] );
+ }
+ break;
+ case RP_POINT:
+ draw->pipeline.first->reset_stipple_counter( draw->pipeline.first );
+ for (i = 0; i < draw->pq.queue_nr; i++)
+ draw->pipeline.first->point( draw->pipeline.first, &draw->pq.queue[i] );
+ break;
+ }
+ }
+ else {
+ switch (draw->reduced_prim) {
+ case RP_TRI:
+ for (i = 0; i < draw->pq.queue_nr; i++)
+ draw->pipeline.first->tri( draw->pipeline.first, &draw->pq.queue[i] );
+ break;
+ case RP_LINE:
+ for (i = 0; i < draw->pq.queue_nr; i++)
+ draw->pipeline.first->line( draw->pipeline.first, &draw->pq.queue[i] );
+ break;
+ case RP_POINT:
+ for (i = 0; i < draw->pq.queue_nr; i++)
+ draw->pipeline.first->point( draw->pipeline.first, &draw->pq.queue[i] );
+ break;
+ }
+ }
+
+ draw->pq.queue_nr = 0;
+ draw_vertex_cache_unreference( draw );
+}
+
+
+
+void draw_do_flush( struct draw_context *draw, unsigned flags )
+{
+ if (0)
+ debug_printf("Flushing with %d verts, %d prims\n",
+ draw->vs.queue_nr,
+ draw->pq.queue_nr );
+
+
+ if (flags >= DRAW_FLUSH_SHADER_QUEUE) {
+ if (draw->vs.queue_nr)
+ (*draw->shader_queue_flush)(draw);
+
+ if (flags >= DRAW_FLUSH_PRIM_QUEUE) {
+ if (draw->pq.queue_nr)
+ draw_prim_queue_flush(draw);
+
+ if (flags >= DRAW_FLUSH_VERTEX_CACHE) {
+ draw_vertex_cache_invalidate(draw);
+
+ if (flags >= DRAW_FLUSH_STATE_CHANGE) {
+ draw->pipeline.first->flush( draw->pipeline.first, flags );
+ draw->pipeline.first = draw->pipeline.validate;
+ draw->reduced_prim = ~0;
+ }
+ }
+ }
+ }
+}
+
+
+
+/* Return a pointer to a freshly queued primitive header. Ensure that
+ * there is room in the vertex cache for a maximum of "nr_verts" new
+ * vertices. Flush primitive and/or vertex queues if necessary to
+ * make space.
+ */
+static struct prim_header *get_queued_prim( struct draw_context *draw,
+ unsigned nr_verts )
+{
+ if (!draw_vertex_cache_check_space( draw, nr_verts )) {
+// debug_printf("v");
+ draw_do_flush( draw, DRAW_FLUSH_VERTEX_CACHE );
+ }
+ else if (draw->pq.queue_nr == PRIM_QUEUE_LENGTH) {
+// debug_printf("p");
+ draw_do_flush( draw, DRAW_FLUSH_PRIM_QUEUE );
+ }
+
+ assert(draw->pq.queue_nr < PRIM_QUEUE_LENGTH);
+
+ return &draw->pq.queue[draw->pq.queue_nr++];
+}
+
+
+
+/**
+ * Add a point to the primitive queue.
+ * \param i0 index into user's vertex arrays
+ */
+static void do_point( struct draw_context *draw,
+ unsigned i0 )
+{
+ struct prim_header *prim = get_queued_prim( draw, 1 );
+
+ prim->reset_line_stipple = 0;
+ prim->edgeflags = 1;
+ prim->pad = 0;
+ prim->v[0] = draw->vcache.get_vertex( draw, i0 );
+}
+
+
+/**
+ * Add a line to the primitive queue.
+ * \param i0 index into user's vertex arrays
+ * \param i1 index into user's vertex arrays
+ */
+static void do_line( struct draw_context *draw,
+ boolean reset_stipple,
+ unsigned i0,
+ unsigned i1 )
+{
+ struct prim_header *prim = get_queued_prim( draw, 2 );
+
+ prim->reset_line_stipple = reset_stipple;
+ prim->edgeflags = 1;
+ prim->pad = 0;
+ prim->v[0] = draw->vcache.get_vertex( draw, i0 );
+ prim->v[1] = draw->vcache.get_vertex( draw, i1 );
+}
+
+/**
+ * Add a triangle to the primitive queue.
+ */
+static void do_triangle( struct draw_context *draw,
+ unsigned i0,
+ unsigned i1,
+ unsigned i2 )
+{
+ struct prim_header *prim = get_queued_prim( draw, 3 );
+
+ prim->reset_line_stipple = 1;
+ prim->edgeflags = ~0;
+ prim->pad = 0;
+ prim->v[0] = draw->vcache.get_vertex( draw, i0 );
+ prim->v[1] = draw->vcache.get_vertex( draw, i1 );
+ prim->v[2] = draw->vcache.get_vertex( draw, i2 );
+}
+
+static void do_ef_triangle( struct draw_context *draw,
+ boolean reset_stipple,
+ unsigned ef_mask,
+ unsigned i0,
+ unsigned i1,
+ unsigned i2 )
+{
+ struct prim_header *prim = get_queued_prim( draw, 3 );
+ struct vertex_header *v0 = draw->vcache.get_vertex( draw, i0 );
+ struct vertex_header *v1 = draw->vcache.get_vertex( draw, i1 );
+ struct vertex_header *v2 = draw->vcache.get_vertex( draw, i2 );
+
+ prim->reset_line_stipple = reset_stipple;
+
+ prim->edgeflags = ef_mask & ((v0->edgeflag << 0) |
+ (v1->edgeflag << 1) |
+ (v2->edgeflag << 2));
+ prim->pad = 0;
+ prim->v[0] = v0;
+ prim->v[1] = v1;
+ prim->v[2] = v2;
+}
+
+
+static void do_ef_quad( struct draw_context *draw,
+ unsigned v0,
+ unsigned v1,
+ unsigned v2,
+ unsigned v3 )
+{
+ const unsigned omitEdge2 = ~(1 << 1);
+ const unsigned omitEdge3 = ~(1 << 2);
+ do_ef_triangle( draw, 1, omitEdge2, v0, v1, v3 );
+ do_ef_triangle( draw, 0, omitEdge3, v1, v2, v3 );
+}
+
+static void do_quad( struct draw_context *draw,
+ unsigned v0,
+ unsigned v1,
+ unsigned v2,
+ unsigned v3 )
+{
+ do_triangle( draw, v0, v1, v3 );
+ do_triangle( draw, v1, v2, v3 );
+}
+
+
+/**
+ * Main entrypoint to draw some number of points/lines/triangles
+ */
+static void
+draw_prim( struct draw_context *draw,
+ unsigned prim, unsigned start, unsigned count )
+{
+ unsigned i;
+ boolean unfilled = (draw->rasterizer->fill_cw != PIPE_POLYGON_MODE_FILL ||
+ draw->rasterizer->fill_ccw != PIPE_POLYGON_MODE_FILL);
+
+// debug_printf("%s (%d) %d/%d\n", __FUNCTION__, draw->prim, start, count );
+
+ switch (prim) {
+ case PIPE_PRIM_POINTS:
+ for (i = 0; i < count; i ++) {
+ do_point( draw,
+ start + i );
+ }
+ break;
+
+ case PIPE_PRIM_LINES:
+ for (i = 0; i+1 < count; i += 2) {
+ do_line( draw,
+ TRUE,
+ start + i + 0,
+ start + i + 1);
+ }
+ break;
+
+ case PIPE_PRIM_LINE_LOOP:
+ if (count >= 2) {
+ for (i = 1; i < count; i++) {
+ do_line( draw,
+ i == 1, /* XXX: only if vb not split */
+ start + i - 1,
+ start + i );
+ }
+
+ do_line( draw,
+ 0,
+ start + count - 1,
+ start + 0 );
+ }
+ break;
+
+ case PIPE_PRIM_LINE_STRIP:
+ for (i = 1; i < count; i++) {
+ do_line( draw,
+ i == 1,
+ start + i - 1,
+ start + i );
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLES:
+ if (unfilled) {
+ for (i = 0; i+2 < count; i += 3) {
+ do_ef_triangle( draw,
+ 1,
+ ~0,
+ start + i + 0,
+ start + i + 1,
+ start + i + 2 );
+ }
+ }
+ else {
+ for (i = 0; i+2 < count; i += 3) {
+ do_triangle( draw,
+ start + i + 0,
+ start + i + 1,
+ start + i + 2 );
+ }
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLE_STRIP:
+ for (i = 0; i+2 < count; i++) {
+ if (i & 1) {
+ do_triangle( draw,
+ start + i + 1,
+ start + i + 0,
+ start + i + 2 );
+ }
+ else {
+ do_triangle( draw,
+ start + i + 0,
+ start + i + 1,
+ start + i + 2 );
+ }
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLE_FAN:
+ if (count >= 3) {
+ for (i = 0; i+2 < count; i++) {
+ do_triangle( draw,
+ start + 0,
+ start + i + 1,
+ start + i + 2 );
+ }
+ }
+ break;
+
+
+ case PIPE_PRIM_QUADS:
+ if (unfilled) {
+ for (i = 0; i+3 < count; i += 4) {
+ do_ef_quad( draw,
+ start + i + 0,
+ start + i + 1,
+ start + i + 2,
+ start + i + 3);
+ }
+ }
+ else {
+ for (i = 0; i+3 < count; i += 4) {
+ do_quad( draw,
+ start + i + 0,
+ start + i + 1,
+ start + i + 2,
+ start + i + 3);
+ }
+ }
+ break;
+
+ case PIPE_PRIM_QUAD_STRIP:
+ if (unfilled) {
+ for (i = 0; i+3 < count; i += 2) {
+ do_ef_quad( draw,
+ start + i + 2,
+ start + i + 0,
+ start + i + 1,
+ start + i + 3);
+ }
+ }
+ else {
+ for (i = 0; i+3 < count; i += 2) {
+ do_quad( draw,
+ start + i + 2,
+ start + i + 0,
+ start + i + 1,
+ start + i + 3);
+ }
+ }
+ break;
+
+ case PIPE_PRIM_POLYGON:
+ if (unfilled) {
+ unsigned ef_mask = (1<<2) | (1<<0);
+
+ for (i = 0; i+2 < count; i++) {
+
+ if (i + 3 >= count)
+ ef_mask |= (1<<1);
+
+ do_ef_triangle( draw,
+ i == 0,
+ ef_mask,
+ start + i + 1,
+ start + i + 2,
+ start + 0);
+
+ ef_mask &= ~(1<<2);
+ }
+ }
+ else {
+ for (i = 0; i+2 < count; i++) {
+ do_triangle( draw,
+ start + i + 1,
+ start + i + 2,
+ start + 0);
+ }
+ }
+ break;
+
+ default:
+ assert(0);
+ break;
+ }
+}
+
+
+
+
+/**
+ * Draw vertex arrays
+ * This is the main entrypoint into the drawing module.
+ * \param prim one of PIPE_PRIM_x
+ * \param start index of first vertex to draw
+ * \param count number of vertices to draw
+ */
+void
+draw_arrays(struct draw_context *draw, unsigned prim,
+ unsigned start, unsigned count)
+{
+ if (reduced_prim[prim] != draw->reduced_prim) {
+ draw_do_flush( draw, DRAW_FLUSH_STATE_CHANGE );
+ draw->reduced_prim = reduced_prim[prim];
+ }
+
+ /* drawing done here: */
+ draw_prim(draw, prim, start, count);
+}
+
+
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