Adds a function to retrieve the renderable DXGI format for a GL internal format.

src/libGLESv2/renderer/Renderer11.cpp

@@ -2451,7 +2451,7 @@ int Renderer11::getMaxSupportedSamples() const
 
 GLsizei Renderer11::getMaxSupportedFormatSamples(GLint internalFormat) const
 {
-    DXGI_FORMAT format = gl_d3d11::GetTexFormat(internalFormat, getCurrentClientVersion());
+    DXGI_FORMAT format = gl_d3d11::GetRenderableFormat(internalFormat, getCurrentClientVersion());
     MultisampleSupportMap::const_iterator iter = mMultisampleSupportMap.find(format);
     return (iter != mMultisampleSupportMap.end()) ? iter->second.maxSupportedSamples : 0;
 }

src/libGLESv2/renderer/formatutils11.cpp

@@ -1011,6 +1011,19 @@ DXGI_FORMAT GetDSVFormat(GLint internalFormat, GLuint clientVersion)
     }
 }
 
+// Given a GL internal format, this function returns the DSV format if it is depth- or stencil-renderable,
+// the RTV format if it is color-renderable, and the (nonrenderable) texture format otherwise.
+DXGI_FORMAT GetRenderableFormat(GLint internalFormat, GLuint clientVersion)
+{
+    DXGI_FORMAT targetFormat = GetDSVFormat(internalFormat, clientVersion);
+    if (targetFormat == DXGI_FORMAT_UNKNOWN)
+        targetFormat = GetRTVFormat(internalFormat, clientVersion);
+    if (targetFormat == DXGI_FORMAT_UNKNOWN)
+        targetFormat = GetTexFormat(internalFormat, clientVersion);
+
+    return targetFormat;
+}
+
 }
 
 namespace d3d11_gl

src/libGLESv2/renderer/formatutils11.h

@@ -48,6 +48,7 @@ DXGI_FORMAT GetTexFormat(GLint internalFormat, GLuint clientVersion);
 DXGI_FORMAT GetSRVFormat(GLint internalFormat, GLuint clientVersion);
 DXGI_FORMAT GetRTVFormat(GLint internalFormat, GLuint clientVersion);
 DXGI_FORMAT GetDSVFormat(GLint internalFormat, GLuint clientVersion);
+DXGI_FORMAT GetRenderableFormat(GLint internalFormat, GLuint clientVersion);
 
 }