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The array size of gl_SampleMask and gl_SampleMaskIn is ceil(gl_MaxSamples/32)

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Oes spec says:
    For the both the input array gl_SampleMaskIn[] and the output array gl_SampleMask[], bit B of mask M
    (gl_SampleMaskIn[M] or gl_SampleMask[M]) corresponds to sample 32*M+B. These arrays have
    ceil(gl_MaxSamples/32) elements, where gl_MaxSamples is the maximum number of color samples
    supported by the implementation.

    But glslang report error "array must have size before use length".

    layout(location = 0) out mediump vec4 fragColor;
    void main (void)
    {
    for (int i = 0; i < gl_SampleMask.length(); ++i)
    gl_SampleMask[i] = int(0xAAAAAAAA);

       fragColor = vec4(0.0, 1.0, 0.0, 1.0);
    }

* Add two test items, one is for gl_MaxSapmles = 32 and the other one is for gl_MaxSapmles = 64.
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jimihem 2023-12-30 05:23:16 +08:00 • committed by GitHub
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commit db4d6f85af
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Test/baseResults/gl_samplemask_array_size_32.frag.out Normal file
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gl_samplemask_array_size.frag
Shader version: 320
0:? Sequence
0:4 Function Definition: main( ( global void)
0:4 Function Parameters:
0:6 Sequence
0:6 Sequence
0:6 Sequence
0:6 move second child to first child ( temp mediump int)
0:6 'i' ( temp mediump int)
0:6 Constant:
0:6 0 (const int)
0:6 Loop with condition tested first
0:6 Loop Condition
0:6 Compare Less Than ( temp bool)
0:6 'i' ( temp mediump int)
0:6 Constant:
0:6 1 (const int)
0:6 Loop Body
0:7 move second child to first child ( temp highp int)
0:7 indirect index ( temp highp int SampleMaskIn)
0:7 'gl_SampleMask' ( out runtime-sized array of highp int SampleMaskIn)
0:7 'i' ( temp mediump int)
0:7 Constant:
0:7 -1431655766 (const int)
0:6 Loop Terminal Expression
0:6 Pre-Increment ( temp mediump int)
0:6 'i' ( temp mediump int)
0:9 move second child to first child ( temp mediump 4-component vector of float)
0:9 'fragColor' (layout( location=0) out mediump 4-component vector of float)
0:9 Constant:
0:9 0.000000
0:9 1.000000
0:9 0.000000
0:9 1.000000
0:? Linker Objects
0:? 'fragColor' (layout( location=0) out mediump 4-component vector of float)
0:? 'gl_SampleMask' ( out runtime-sized array of highp int SampleMaskIn)