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authorKeith Whitwell <[email protected]>2008-12-09 16:57:53 +0000
committerKeith Whitwell <[email protected]>2008-12-10 12:52:07 +0000
commit50beb86ce399534b049322f1074365ed03395ab2 (patch)
treef38cc859710e324803d43d09925e2ea70a30cb9a /src/gallium/auxiliary/util
parent7519107a9787970f9b3b8ec317a2b4526e217290 (diff)
util: new funcs for triming/validating primitives
Diffstat (limited to 'src/gallium/auxiliary/util')
-rw-r--r--src/gallium/auxiliary/util/u_prim.h122
1 files changed, 122 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h
new file mode 100644
index 00000000000..e45e84ded2c
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_prim.h
@@ -0,0 +1,122 @@
+/**************************************************************************
+ *
+ * Copyright 2008 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.
+ *
+ **************************************************************************/
+
+
+#ifndef U_BLIT_H
+#define U_BLIT_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "pipe/p_defines.h"
+
+static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
+{
+ boolean ok = TRUE;
+
+ switch (pipe_prim) {
+ case PIPE_PRIM_POINTS:
+ ok = (nr >= 1);
+ break;
+ case PIPE_PRIM_LINES:
+ ok = (nr >= 2);
+ break;
+ case PIPE_PRIM_LINE_STRIP:
+ case PIPE_PRIM_LINE_LOOP:
+ ok = (nr >= 2);
+ break;
+ case PIPE_PRIM_TRIANGLES:
+ ok = (nr >= 3);
+ break;
+ case PIPE_PRIM_TRIANGLE_STRIP:
+ case PIPE_PRIM_TRIANGLE_FAN:
+ case PIPE_PRIM_POLYGON:
+ ok = (nr >= 3);
+ break;
+ case PIPE_PRIM_QUADS:
+ ok = (nr >= 4);
+ break;
+ case PIPE_PRIM_QUAD_STRIP:
+ ok = (nr >= 4);
+ break;
+ default:
+ ok = 0;
+ break;
+ }
+
+ return ok;
+}
+
+
+static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
+{
+ boolean ok = TRUE;
+
+ switch (pipe_prim) {
+ case PIPE_PRIM_POINTS:
+ ok = (*nr >= 1);
+ break;
+ case PIPE_PRIM_LINES:
+ ok = (*nr >= 2);
+ *nr -= (*nr % 2);
+ break;
+ case PIPE_PRIM_LINE_STRIP:
+ case PIPE_PRIM_LINE_LOOP:
+ ok = (*nr >= 2);
+ break;
+ case PIPE_PRIM_TRIANGLES:
+ ok = (*nr >= 3);
+ *nr -= (*nr % 3);
+ break;
+ case PIPE_PRIM_TRIANGLE_STRIP:
+ case PIPE_PRIM_TRIANGLE_FAN:
+ case PIPE_PRIM_POLYGON:
+ ok = (*nr >= 3);
+ break;
+ case PIPE_PRIM_QUADS:
+ ok = (*nr >= 4);
+ *nr -= (*nr % 4);
+ break;
+ case PIPE_PRIM_QUAD_STRIP:
+ ok = (*nr >= 4);
+ *nr -= (*nr % 2);
+ break;
+ default:
+ ok = 0;
+ break;
+ }
+
+ if (!ok)
+ *nr = 0;
+
+ return ok;
+}
+
+
+#endif