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Merge pull request #154 from KhronosGroup/bitfield-fix

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Fix bitfield functions.
This commit is contained in:
Hans-Kristian Arntzen 2017-03-25 15:52:54 +01:00 committed by GitHub
commit a5546e9963
3 changed files with 43 additions and 1 deletions
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19
reference/shaders/comp/bitfield.comp Normal file
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@ -0,0 +1,19 @@
#version 310 es
layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void main()
{
int signed_value = 0;
uint unsigned_value = 0u;
int s = bitfieldExtract(signed_value, 5, 20);
uint u = bitfieldExtract(unsigned_value, 6, 21);
s = bitfieldInsert(s, 40, 5, 4);
u = bitfieldInsert(u, 60u, 5, 4);
u = bitfieldReverse(u);
s = bitfieldReverse(s);
int v0 = bitCount(u);
int v1 = bitCount(s);
int v2 = findMSB(u);
int v3 = findLSB(s);
}

21
shaders/comp/bitfield.comp Normal file
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@ -0,0 +1,21 @@
#version 310 es
void main()
{
int signed_value = 0;
uint unsigned_value = 0u;
int s = bitfieldExtract(signed_value, 5, 20);
uint u = bitfieldExtract(unsigned_value, 6, 21);
s = bitfieldInsert(s, 40, 5, 4);
u = bitfieldInsert(u, 60u, 5, 4);
u = bitfieldReverse(u);
s = bitfieldReverse(s);
int v0 = bitCount(u);
int v1 = bitCount(s);
int v2 = findMSB(u);
int v3 = findLSB(s);
}

4
spirv_glsl.cpp
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@ -5103,12 +5103,14 @@ void CompilerGLSL::emit_instruction(const Instruction &instruction)
// Bitfield
case OpBitFieldInsert:
// TODO: The signedness of inputs is strict in GLSL, but not in SPIR-V, bitcast if necessary.
QFOP(bitfieldInsert);
break;
case OpBitFieldSExtract:
case OpBitFieldUExtract:
QFOP(bitfieldExtract);
// TODO: The signedness of inputs is strict in GLSL, but not in SPIR-V, bitcast if necessary.
TFOP(bitfieldExtract);
break;
case OpBitReverse: