Only advertise postSubBuffer extension if we can actually present less than the whole buffer.

src/libEGL/Display.cpp

@@ -500,7 +500,10 @@ void Display::initExtensionString()
         mExtensionString += "EGL_ANGLE_surface_d3d_texture_2d_share_handle ";
     }
 
+    if (mRenderer->getPostSubBufferSupport())
+    {
         mExtensionString += "EGL_NV_post_sub_buffer";
+    }
 
     std::string::size_type end = mExtensionString.find_last_not_of(' ');
     if (end != std::string::npos)

src/libGLESv2/renderer/Renderer.h

@@ -167,6 +167,7 @@ class Renderer
     virtual float getTextureMaxAnisotropy() const = 0;
     virtual bool getShareHandleSupport() const = 0;
     virtual bool getDerivativeInstructionSupport() const = 0;
+    virtual bool getPostSubBufferSupport() const = 0;
 
     virtual int getMajorShaderModel() const = 0;
     virtual float getMaxPointSize() const = 0;

src/libGLESv2/renderer/Renderer11.cpp

@@ -2235,6 +2235,12 @@ bool Renderer11::getDerivativeInstructionSupport() const
     }
 }
 
+bool Renderer11::getPostSubBufferSupport() const
+{
+    // D3D11 does not support present with dirty rectangles until D3D11.1 and DXGI 1.2.
+    return false;
+}
+
 int Renderer11::getMajorShaderModel() const
 {
     switch (mFeatureLevel)

src/libGLESv2/renderer/Renderer11.h

@@ -118,6 +118,7 @@ class Renderer11 : public Renderer
     virtual float getTextureMaxAnisotropy() const;
     virtual bool getShareHandleSupport() const;
     virtual bool getDerivativeInstructionSupport() const;
+    virtual bool getPostSubBufferSupport() const;
 
     virtual int getMajorShaderModel() const;
     virtual float getMaxPointSize() const;

src/libGLESv2/renderer/Renderer9.cpp

@@ -2306,6 +2306,11 @@ bool Renderer9::getDerivativeInstructionSupport() const
     return (mDeviceCaps.PS20Caps.Caps & D3DPS20CAPS_GRADIENTINSTRUCTIONS) != 0;
 }
 
+bool Renderer9::getPostSubBufferSupport() const
+{
+    return true;
+}
+
 int Renderer9::getMajorShaderModel() const
 {
     return D3DSHADER_VERSION_MAJOR(mDeviceCaps.PixelShaderVersion);

src/libGLESv2/renderer/Renderer9.h

@@ -146,6 +146,7 @@ class Renderer9 : public Renderer
     virtual float getTextureMaxAnisotropy() const;
     virtual bool getShareHandleSupport() const;
     virtual bool getDerivativeInstructionSupport() const;
+    virtual bool getPostSubBufferSupport() const;
 
     virtual int getMajorShaderModel() const;
     virtual float getMaxPointSize() const;