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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>
24 lines
543 B
GLSL
24 lines
543 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 FragmentInputs {
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vec4 position;
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bool front_facing;
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uint sample_index;
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uint sample_mask;
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};
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void tint_symbol(FragmentInputs inputs) {
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if (inputs.front_facing) {
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vec4 foo = inputs.position;
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uint bar = (inputs.sample_index + inputs.sample_mask);
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}
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}
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void main() {
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FragmentInputs tint_symbol_1 = FragmentInputs(gl_FragCoord, gl_FrontFacing, uint(gl_SampleID), uint(gl_SampleMaskIn[0]));
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tint_symbol(tint_symbol_1);
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return;
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}
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