Texture Draw Calls Coalescing

cc/gl_renderer_drawcache.h

Index: cc/gl_renderer_drawcache.h
diff --git a/cc/gl_renderer_drawcache.h b/cc/gl_renderer_drawcache.h
new file mode 100644
index 0000000000000000000000000000000000000000..0a5967d3a2512afd6838ba00712c9a7a8709b9c3
--- /dev/null
+++ b/cc/gl_renderer_drawcache.h
@@ -0,0 +1,43 @@
+// Copyright 2010 The Chromium Authors. All rights reserved.

[jamesr, 2012/11/29 11:17:11]

it's 2012

+// 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

[jamesr, 2012/11/29 11:17:11]

Start comments with a uppercase letter, end with a period

+struct float4 { float data[4]; };

[jamesr, 2012/11/29 11:17:11]

chromium style for naming would have this be Float4

+
+// collects 16 floats at a time for easy upload to GL
+struct float16 { float data[16]; };

[jamesr, 2012/11/29 11:17:11]

similarly Float16

+
+// 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
+{

[jamesr, 2012/11/29 11:17:11]

the cc/ directory is currently a mix of WebKit style and chromium style, but for
new classes we're trying to stick to chromium style (since we'll convert
everything to that eventually anyway).  that means putting this curly brace on
the previous line and using chromium indentation (2-space)

+    TexturedQuadDrawCache();
+    virtual ~TexturedQuadDrawCache();

[jamesr, 2012/11/29 11:17:11]

do you need a virtual destructor? there aren't any methods on this

+
+    // Values tracked to determine if textured quads may be coalesced
+    int programID;

[jamesr, 2012/11/29 11:17:11]

chromium style for these is to use hacker_style instead of camelCaseStyle for
members

+    int resourceID;
+    float alpha;
+    bool usePremultipliedAlpha;
+    bool needsBlending;
+
+    // Information about the program binding that is required to draw
+    int alphaLocation;
+    int uvXformLocation;
+    int matrixLocation;
+
+    // A cache for the coalesced quad data
+    std::vector<float4> uvXformData;
+    std::vector<float16> matrixData;
+};
+
+#endif // CC_GL_RENDERER_DRAW_CACHE_H_
+