Add multiple color buffer attachments points to gl::Framebuffer.

Also addded the checks for framebuffer completeness as defined by the ES2 spec and EXT_draw_buffers.

TRAC #22656

Signed-off-by: Nicolas Capens
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2065 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/renderer/Renderer11.cpp b/src/libGLESv2/renderer/Renderer11.cpp
index 575c4ce..a0439b2 100644
--- a/src/libGLESv2/renderer/Renderer11.cpp
+++ b/src/libGLESv2/renderer/Renderer11.cpp
@@ -2359,6 +2359,9 @@
 
 unsigned int Renderer11::getMaxRenderTargets() const
 {
+    META_ASSERT(D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT <= gl::IMPLEMENTATION_MAX_DRAW_BUFFERS);
+    META_ASSERT(D3D10_SIMULTANEOUS_RENDER_TARGET_COUNT <= gl::IMPLEMENTATION_MAX_DRAW_BUFFERS);
+
     switch (mFeatureLevel)
     {
       case D3D_FEATURE_LEVEL_11_0: