Texture Draw Calls Coalescing

cc/gl_renderer_draw_cache.h

+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_GL_RENDERER_DRAW_CACHE_H_
+#define CC_GL_RENDERER_DRAW_CACHE_H_
+
+#include <vector>
+
+
+// Collects 4 floats at a time for easy upload to GL.
+struct Float4 { float data[4]; };
+
+// Collects 16 floats at a time for easy upload to GL.
+struct Float16 { float data[16]; };
+
+// A cache for storing textured quads to be drawn.  Stores the minimum required
+// data to tell if two back to back draws only differ in their transform. Quads
+// that only differ by transform may be coalesced into a single draw call.
+struct TexturedQuadDrawCache {
+  TexturedQuadDrawCache();
+  ~TexturedQuadDrawCache();
+
+  // Values tracked to determine if textured quads may be coalesced.
+  int program_id;
+  int resource_id;
+  float alpha;
+  bool use_premultiplied_alpha;
+  bool needs_blending;
+
+  // Information about the program binding that is required to draw.
+  int alpha_location;
+  int uv_xform_location;
+  int matrix_location;
+
+  // A cache for the coalesced quad data.
+  std::vector<Float4> uv_xform_data;
+  std::vector<Float16> matrix_data;
+};
+
+#endif // CC_GL_RENDERER_DRAW_CACHE_H_
+