Texture Draw Calls Coalescing

cc/shader.cc

Index: cc/shader.cc
diff --git a/cc/shader.cc b/cc/shader.cc
index a9a0877db05fb2067f316711b049eee7fda6b54b..c84d88aeccc948abe96257d14778f0a843d6cb20 100644
--- a/cc/shader.cc
+++ b/cc/shader.cc
@@ -159,13 +159,14 @@ std::string VertexShaderPosTexTransform::getShaderString() const
     return SHADER(
         attribute vec4 a_position;
         attribute vec2 a_texCoord;
-        uniform mat4 matrix;
-        uniform vec4 texTransform;
+        attribute float a_index;
+        uniform mat4 matrix[8];
+        uniform vec4 texTransform[8];
         varying vec2 v_texCoord;
         void main()
         {
-            gl_Position = matrix * a_position;
-            v_texCoord = a_texCoord * texTransform.zw + texTransform.xy;
+            gl_Position = matrix[int(a_index)] * a_position;
+            v_texCoord = a_texCoord * texTransform[int(a_index)].zw + texTransform[int(a_index)].xy;
         }
     );
 }