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In GLSL, gl_SampleID and gl_SampleMask[In] require the GL_OES_sample_variables extension, so output: "#extension GL_OES_sample_variables : require" in the header if those builtins is used. Note that extensions must be inserted before the default precision declaration, but helpers must be inserted after it, so we set a flag and emit extensions, then the precision declaration, then helpers. Further fixes: - use gl_SampleMaskIn for input builtins, gl_SampleMask for output, necessitating the addition of a storage class to GLSLBuiltinToString() - fix the handling of gl_SampleMaskIn: it's array<i32> in GLSL, not array<u32> as in SPIR-V - centralize conversions for GLSL builtins used as input variables in FromGLSLBuiltin() - implement bitcasts on assignment to GLSL builtin output variables, centralized in ToGLSLBuiltin() - update the extension handling in the GLSL writer to check for both sample_index and sample_mask. - call UnwrapRef() in GLSL's EmitBitcast(). In the test case, we were not recognizing the argument as a uint, yielding float() instead of uintBitsToFloat(). Bug: tint:1408, tint:1412, tint:1414 Change-Id: Ie01541eb6e7cdf4e21347341f988bff916346797 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/78920 Reviewed-by: Ben Clayton <bclayton@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Stephen White <senorblanco@chromium.org>
21 lines
444 B
GLSL
21 lines
444 B
GLSL
#version 310 es
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#extension GL_OES_sample_variables : require
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precision mediump float;
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struct FragmentOutputs {
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float frag_depth;
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uint sample_mask;
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};
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FragmentOutputs tint_symbol() {
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FragmentOutputs tint_symbol_1 = FragmentOutputs(1.0f, 1u);
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return tint_symbol_1;
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}
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void main() {
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FragmentOutputs inner_result = tint_symbol();
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gl_FragDepth = inner_result.frag_depth;
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gl_SampleMask[0] = int(inner_result.sample_mask);
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return;
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}
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