diff options
| author | marha <marha@users.sourceforge.net> | 2011-04-30 16:21:56 +0000 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2011-04-30 16:21:56 +0000 |
| commit | e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f (patch) | |
| tree | 1804d7456ba8f200c7e329d4e6aa67ce4fb1649f /mesalib/src/gallium/auxiliary/util/u_split_prim.h | |
| parent | 88a78ebea08af461224f815a8380ea5c54186f43 (diff) | |
| parent | 0402d388cb9803652c0f9a52ba7dcb6029fdd0b9 (diff) | |
| download | vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.tar.gz vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.tar.bz2 vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.zip | |
svn merge ^/branches/released .
Diffstat (limited to 'mesalib/src/gallium/auxiliary/util/u_split_prim.h')
| -rw-r--r-- | mesalib/src/gallium/auxiliary/util/u_split_prim.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_split_prim.h b/mesalib/src/gallium/auxiliary/util/u_split_prim.h new file mode 100644 index 000000000..9c83d6461 --- /dev/null +++ b/mesalib/src/gallium/auxiliary/util/u_split_prim.h @@ -0,0 +1,114 @@ +/* Originally written by Ben Skeggs for the nv50 driver*/
+
+#ifndef U_SPLIT_PRIM_H
+#define U_SPLIT_PRIM_H
+
+#include "pipe/p_defines.h"
+#include "pipe/p_compiler.h"
+
+#include "util/u_debug.h"
+
+struct util_split_prim {
+ void *priv;
+ void (*emit)(void *priv, unsigned start, unsigned count);
+ void (*edge)(void *priv, boolean enabled);
+
+ unsigned mode;
+ unsigned start;
+ unsigned p_start;
+ unsigned p_end;
+
+ uint repeat_first:1;
+ uint close_first:1;
+ uint edgeflag_off:1;
+};
+
+static INLINE void
+util_split_prim_init(struct util_split_prim *s,
+ unsigned mode, unsigned start, unsigned count)
+{
+ if (mode == PIPE_PRIM_LINE_LOOP) {
+ s->mode = PIPE_PRIM_LINE_STRIP;
+ s->close_first = 1;
+ } else {
+ s->mode = mode;
+ s->close_first = 0;
+ }
+ s->start = start;
+ s->p_start = start;
+ s->p_end = start + count;
+ s->edgeflag_off = 0;
+ s->repeat_first = 0;
+}
+
+static INLINE boolean
+util_split_prim_next(struct util_split_prim *s, unsigned max_verts)
+{
+ int repeat = 0;
+
+ if (s->repeat_first) {
+ s->emit(s->priv, s->start, 1);
+ max_verts--;
+ if (s->edgeflag_off) {
+ s->edge(s->priv, TRUE);
+ s->edgeflag_off = FALSE;
+ }
+ }
+
+ if ((s->p_end - s->p_start) + s->close_first <= max_verts) {
+ s->emit(s->priv, s->p_start, s->p_end - s->p_start);
+ if (s->close_first)
+ s->emit(s->priv, s->start, 1);
+ return TRUE;
+ }
+
+ switch (s->mode) {
+ case PIPE_PRIM_LINES:
+ max_verts &= ~1;
+ break;
+ case PIPE_PRIM_LINE_STRIP:
+ repeat = 1;
+ break;
+ case PIPE_PRIM_POLYGON:
+ max_verts--;
+ s->emit(s->priv, s->p_start, max_verts);
+ s->edge(s->priv, FALSE);
+ s->emit(s->priv, s->p_start + max_verts, 1);
+ s->p_start += max_verts;
+ s->repeat_first = TRUE;
+ s->edgeflag_off = TRUE;
+ return FALSE;
+ case PIPE_PRIM_TRIANGLES:
+ max_verts = max_verts - (max_verts % 3);
+ break;
+ case PIPE_PRIM_TRIANGLE_STRIP:
+ /* to ensure winding stays correct, always split
+ * on an even number of generated triangles
+ */
+ max_verts = max_verts & ~1;
+ repeat = 2;
+ break;
+ case PIPE_PRIM_TRIANGLE_FAN:
+ s->repeat_first = TRUE;
+ repeat = 1;
+ break;
+ case PIPE_PRIM_QUADS:
+ max_verts &= ~3;
+ break;
+ case PIPE_PRIM_QUAD_STRIP:
+ max_verts &= ~1;
+ repeat = 2;
+ break;
+ case PIPE_PRIM_POINTS:
+ break;
+ default:
+ /* TODO: implement adjacency primitives */
+ assert(0);
+ }
+
+ s->emit (s->priv, s->p_start, max_verts);
+ s->p_start += (max_verts - repeat);
+ return FALSE;
+}
+
+#endif /* U_SPLIT_PRIM_H */
|