Add an IsDepthFormat helper function

src/libGLESv2/utilities.cpp

@@ -993,6 +993,16 @@ bool IsFloat16Format(D3DFORMAT surfaceFormat)
     return false;
 }
 
+bool IsDepthFormat(D3DFORMAT surfaceFormat)
+{
+    return (surfaceFormat == D3DFMT_INTZ);
+}
+
+bool IsStencilFormat(D3DFORMAT surfaceFormat)
+{
+    return (surfaceFormat == D3DFMT_INTZ);
+}
+
 GLsizei GetSamplesFromMultisampleType(D3DMULTISAMPLE_TYPE type)
 {
     if (type == D3DMULTISAMPLE_NONMASKABLE)

src/libGLESv2/utilities.h

@@ -83,6 +83,8 @@ GLuint GetDepthSize(D3DFORMAT depthFormat);
 GLuint GetStencilSize(D3DFORMAT stencilFormat);
 bool IsFloat32Format(D3DFORMAT surfaceFormat);
 bool IsFloat16Format(D3DFORMAT surfaceFormat);
+bool IsDepthFormat(D3DFORMAT surfaceFormat);
+bool IsStencilFormat(D3DFORMAT surfaceFormat);
 
 GLsizei GetSamplesFromMultisampleType(D3DMULTISAMPLE_TYPE type);