Known Issues

OpenGL ES Conformance issues on D3D11 Feature Level 9_3

Example D3D11 Feature Level 9_3 devices include Windows Phones

#####GL_MAX_VARYING_VECTORS = 7

• For full OpenGL ES conformance, GL_MAX_VARYING_VECTORS should be >= 8.
• We can only support 7 on D3D11 Feature Level 9_3.

#####gl_FrontFace isn’t supported in fragment shaders

• It has no equivalent on D3D11 Feature Level 9_3.

#####GL_SAMPLE_ALPHA_TO_COVERAGE isn't supported

• It has no equivalent on D3D11 Feature Level 9_3.

#####Non-power-of-two texture cubes aren't supported

• They aren't supported on D3D11 Feature Level 9_3.

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Other notes for D3D11 Feature Level 9_3

#####Vertex Texture Fetch isn’t supported

• This isn’t required for full OpenGL ES 2.0 conformance.

#####GL_RGBA32F_EXT textures aren't fully supported

• Support for them isn’t required for full OpenGL ES 2.0 conformance.
• GL_RGBA32F_EXT is part of the 'GL_EXT_texture_storage' extension which is enabled on 9_3.
• Simple operations with GL_RGBA32F_EXT will work. More complicated operations (e.g. blending) aren't supported.

#####'for loops' in shaders must use a constant number of iterations

• Support for variable-length 'for loops' isn't required for full OpenGL ES 2.0 conformance.
• See Appendix A Section 4 of the GLSL ES Specification
• The number of iterations in a 'for loop' must be easily determined at compile time.
• This means that you should not use non-constant values (e.g. uniforms) in your 'for loop' conditions

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Other known issues

None!

If you experience other issues with ANGLE in the Windows Store, then please file a GitHub issue here.