Cache the index ranges at the gl::Buffer and rx::IndexBuffer levels so that ranges do not need to be re-calculated for direct buffers.
Issue #451
Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Geoff Lang
diff --git a/src/libGLESv2/renderer/IndexRangeCache.h b/src/libGLESv2/renderer/IndexRangeCache.h
new file mode 100644
index 0000000..5a5ade1
--- /dev/null
+++ b/src/libGLESv2/renderer/IndexRangeCache.h
@@ -0,0 +1,58 @@
+//
+// Copyright (c) 2013 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// IndexRangeCache.h: Defines the rx::IndexRangeCache class which stores information about
+// ranges of indices.
+
+#ifndef LIBGLESV2_RENDERER_INDEXRANGECACHE_H_
+#define LIBGLESV2_RENDERER_INDEXRANGECACHE_H_
+
+#include "common/angleutils.h"
+
+namespace rx
+{
+
+class IndexRangeCache
+{
+ public:
+ void addRange(GLenum type, intptr_t offset, GLsizei count, unsigned int minIdx, unsigned int maxIdx,
+ unsigned int streamOffset);
+ bool findRange(GLenum type, intptr_t offset, GLsizei count, unsigned int *outMinIndex,
+ unsigned int *outMaxIndex, unsigned int *outStreamOffset) const;
+
+ void invalidateRange(unsigned int offset, unsigned int size);
+ void clear();
+
+ private:
+ struct IndexRange
+ {
+ GLenum type;
+ intptr_t offset;
+ GLsizei count;
+
+ IndexRange();
+ IndexRange(GLenum type, intptr_t offset, GLsizei count);
+
+ bool operator<(const IndexRange& rhs) const;
+ };
+
+ struct IndexBounds
+ {
+ unsigned int minIndex;
+ unsigned int maxIndex;
+ unsigned int streamOffset;
+
+ IndexBounds();
+ IndexBounds(unsigned int minIdx, unsigned int maxIdx, unsigned int offset);
+ };
+
+ typedef std::map<IndexRange, IndexBounds> IndexRangeMap;
+ IndexRangeMap mIndexRangeCache;
+};
+
+}
+
+#endif LIBGLESV2_RENDERER_INDEXRANGECACHE_H