D3D: No-op ClearBufferfi calls with no DS attachments.

The ES3 spec is clear that these calls should no-op, see page 187, "If a buffer is not present, then a Clear directed at that buffer has no effect." BUG=angleproject:1078 TEST=dEQP-GLES3.functional.fbo.msaa.2_samples.* Change-Id: Ic521f55785d10065e2ffe2e98a68c9d7da0c2c71 Reviewed-on: https://chromium-review.googlesource.com/286776Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

D3D: No-op ClearBufferfi calls with no DS attachments.
90549e9d · Jamie Madill · 6d276c8e · 90549e9d
Commit 90549e9d authored Jul 20, 2015 by Jamie Madill
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entry_points_gles_3_0.cpp src/libGLESv2/entry_points_gles_3_0.cpp +6 -0

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--- a/src/libGLESv2/entry_points_gles_3_0.cpp
+++ b/src/libGLESv2/entry_points_gles_3_0.cpp
@@ -1873,6 +1873,12 @@ void GL_APIENTRY ClearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, G
        Framebuffer *framebufferObject = context->getState().getDrawFramebuffer();
        ASSERT(framebufferObject);

+        // If a buffer is not present, the clear has no effect
+        if (framebufferObject->getDepthbuffer() == nullptr && framebufferObject->getStencilbuffer() == nullptr)
+        {
+            return;
+        }
+
        Error error = framebufferObject->clearBufferfi(context->getState(), buffer, drawbuffer, depth, stencil);
        if (error.isError())
        {