--- /dev/null
+/**************************************************************************
+ *
+ * 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 "draw_private.h"
+#include "draw_context.h"
+#include "draw_prim.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
+};
+
+
+void draw_flush( struct draw_context *draw )
+{
+ struct draw_stage *first = draw->pipeline.first;
+ unsigned i;
+
+ /* Make sure all vertices are available:
+ */
+ assert(draw->vs_flush);
+ draw->vs_flush( draw );
+
+
+ switch (draw->reduced_prim) {
+ case RP_TRI:
+ for (i = 0; i < draw->pq.queue_nr; i++) {
+ if (draw->pq.queue[i].reset_line_stipple)
+ first->reset_stipple_counter( first );
+
+ first->tri( 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)
+ first->reset_stipple_counter( first );
+
+ first->line( first, &draw->pq.queue[i] );
+ }
+ break;
+ case RP_POINT:
+ first->reset_stipple_counter( first );
+ for (i = 0; i < draw->pq.queue_nr; i++)
+ first->point( first, &draw->pq.queue[i] );
+ break;
+ }
+
+ draw->pq.queue_nr = 0;
+ draw->vcache.referenced = 0;
+ draw->vcache.overflow = 0;
+}
+
+
+void draw_invalidate_vcache( struct draw_context *draw )
+{
+ unsigned i;
+
+ assert(draw->pq.queue_nr == 0);
+ assert(draw->vs.queue_nr == 0);
+ assert(draw->vcache.referenced == 0);
+
+ for (i = 0; i < Elements( draw->vcache.idx ); i++)
+ draw->vcache.idx[i] = ~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->pq.queue_nr + 1 >= PRIM_QUEUE_LENGTH ||
+ draw->vcache.overflow + nr_verts >= VCACHE_OVERFLOW)
+ draw_flush( draw );
+
+ /* The vs queue is sized so that this can never happen:
+ */
+ assert(draw->vs.queue_nr + nr_verts < VS_QUEUE_LENGTH);
+
+ return &draw->pq.queue[draw->pq.queue_nr++];
+}
+
+
+/* Check if vertex is in cache, otherwise add it. It won't go through
+ * VS yet, not until there is a flush operation or the VS queue fills up.
+ */
+static struct vertex_header *get_vertex( struct draw_context *draw,
+ unsigned i )
+{
+ unsigned slot = (i + (i>>5)) & 31;
+
+ /* Cache miss?
+ */
+ if (draw->vcache.idx[slot] != i) {
+
+ /* If slot is in use, use the overflow area:
+ */
+ if (draw->vcache.referenced & (1<<slot))
+ slot = draw->vcache.overflow++;
+
+ draw->vcache.idx[slot] = i;
+
+ /* Add to vertex shader queue:
+ */
+ draw->vs.queue[draw->vs.queue_nr].dest = draw->vcache.vertex[slot];
+ draw->vs.queue[draw->vs.queue_nr].elt = i;
+ draw->vs.queue_nr++;
+ }
+
+ /* Mark slot as in-use:
+ */
+ draw->vcache.referenced |= (1<<slot);
+ return draw->vcache.vertex[slot];
+}
+
+
+static struct vertex_header *get_uint_elt_vertex( struct draw_context *draw,
+ unsigned i )
+{
+ const unsigned *elts = (const unsigned *)draw->elts;
+ return get_vertex( draw, elts[i] );
+}
+
+
+static struct vertex_header *get_ushort_elt_vertex( struct draw_context *draw,
+ unsigned i )
+{
+ const GLushort *elts = (const GLushort *)draw->elts;
+ return get_vertex( draw, elts[i] );
+}
+
+
+static struct vertex_header *get_ubyte_elt_vertex( struct draw_context *draw,
+ unsigned i )
+{
+ const GLubyte *elts = (const GLubyte *)draw->elts;
+ return get_vertex( draw, elts[i] );
+}
+
+
+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->get_vertex( draw, i0 );
+}
+
+
+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->get_vertex( draw, i0 );
+ prim->v[1] = draw->get_vertex( draw, i1 );
+}
+
+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->get_vertex( draw, i0 );
+ prim->v[1] = draw->get_vertex( draw, i1 );
+ prim->v[2] = draw->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->get_vertex( draw, i0 );
+ struct vertex_header *v1 = draw->get_vertex( draw, i1 );
+ struct vertex_header *v2 = draw->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_quad( struct draw_context *draw,
+ unsigned v0,
+ unsigned v1,
+ unsigned v2,
+ unsigned v3 )
+{
+ do_ef_triangle( draw, 1, ~(1<<0), v0, v1, v3 );
+ do_ef_triangle( draw, 0, ~(1<<1), v1, v2, v3 );
+}
+
+
+/**
+ * Main entrypoint to draw some number of points/lines/triangles
+ */
+void
+draw_prim( struct draw_context *draw, unsigned start, unsigned count )
+{
+ unsigned i;
+
+// _mesa_printf("%s (%d) %d/%d\n", __FUNCTION__, draw->prim, start, count );
+
+ switch (draw->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:
+ if (count >= 2) {
+ for (i = 1; i < count; i++) {
+ do_line( draw,
+ i == 1,
+ start + i - 1,
+ start + i );
+ }
+ }
+ break;
+
+ case PIPE_PRIM_TRIANGLES:
+ for (i = 0; i+2 < count; i += 3) {
+ do_ef_triangle( draw,
+ 1,
+ ~0,
+ 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:
+ 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:
+ 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 (count >= 3) {
+ 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 + i + 0);
+
+ ef_mask &= ~(1<<2);
+ }
+ }
+ break;
+
+ default:
+ assert(0);
+ break;
+ }
+}
+
+
+void
+draw_set_prim( struct draw_context *draw, unsigned prim )
+{
+ assert(prim >= PIPE_PRIM_POINTS);
+ assert(prim <= PIPE_PRIM_POLYGON);
+
+ if (reduced_prim[prim] != draw->reduced_prim) {
+ draw_flush( draw );
+ draw->reduced_prim = reduced_prim[prim];
+ }
+
+ draw->prim = prim;
+}
+
+
+/**
+ * Tell the drawing context about the index/element buffer to use
+ * (ala glDrawElements)
+ * If no element buffer is to be used (i.e. glDrawArrays) then this
+ * should be called with eltSize=0 and elements=NULL.
+ *
+ * \param draw the drawing context
+ * \param eltSize size of each element (1, 2 or 4 bytes)
+ * \param elements the element buffer ptr
+ */
+void
+draw_set_element_buffer( struct draw_context *draw,
+ unsigned eltSize, void *elements )
+{
+ /* choose the get_vertex() function to use */
+ switch (eltSize) {
+ case 0:
+ draw->get_vertex = get_vertex;
+ break;
+ case 1:
+ draw->get_vertex = get_ubyte_elt_vertex;
+ break;
+ case 2:
+ draw->get_vertex = get_ushort_elt_vertex;
+ break;
+ case 4:
+ draw->get_vertex = get_uint_elt_vertex;
+ break;
+ default:
+ assert(0);
+ }
+ draw->elts = elements;
+ draw->eltSize = eltSize;
+
+
+}
+
+unsigned
+draw_prim_info(unsigned prim, unsigned *first, unsigned *incr)
+{
+ assert(prim >= PIPE_PRIM_POINTS);
+ assert(prim <= PIPE_PRIM_POLYGON);
+
+ switch (prim) {
+ case PIPE_PRIM_POINTS:
+ *first = 1;
+ *incr = 1;
+ return 0;
+ case PIPE_PRIM_LINES:
+ *first = 2;
+ *incr = 2;
+ return 0;
+ case PIPE_PRIM_LINE_STRIP:
+ *first = 2;
+ *incr = 1;
+ return 0;
+ case PIPE_PRIM_LINE_LOOP:
+ *first = 2;
+ *incr = 1;
+ return 1;
+ case PIPE_PRIM_TRIANGLES:
+ *first = 3;
+ *incr = 3;
+ return 0;
+ case PIPE_PRIM_TRIANGLE_STRIP:
+ *first = 3;
+ *incr = 1;
+ return 0;
+ case PIPE_PRIM_TRIANGLE_FAN:
+ case PIPE_PRIM_POLYGON:
+ *first = 3;
+ *incr = 1;
+ return 1;
+ case PIPE_PRIM_QUADS:
+ *first = 4;
+ *incr = 4;
+ return 0;
+ case PIPE_PRIM_QUAD_STRIP:
+ *first = 4;
+ *incr = 2;
+ return 0;
+ default:
+ assert(0);
+ *first = 1;
+ *incr = 1;
+ return 0;
+ }
+}
+
+
+unsigned
+draw_trim( unsigned count, unsigned first, unsigned incr )
+{
+ if (count < first)
+ return 0;
+ else
+ return count - (count - first) % incr;
+}
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