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WIP: HLSL: support global const initializers from non-constant rvalues
Semantic test left over from other source languages is removed, since this is permitted by HLSL. Also, to support the functionality, a targeted test is performed for this case and it is turned into a EvqGlobal qualifier to create an AST initialization segment when needed. Constness is now propagated up aggregate chains during initializer construction. This handles hierarchical cases such as the distinction between: static const float2 a[2] = { { 1, 2 }, { 3, 4} }; vs static const float2 a[2] = { { 1, 2 }, { cbuffer_member, 4} }; The first of which can use a first class constant initalization, and the second cannot.
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Test/baseResults/hlsl.global-const-init.frag.out
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Test/baseResults/hlsl.global-const-init.frag.out
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hlsl.global-const-init.frag
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Shader version: 500
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gl_FragCoord origin is upper left
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0:? Sequence
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0:6 Sequence
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0:6 move second child to first child ( temp 4-component vector of float)
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0:6 'bar' ( global 4-component vector of float)
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0:6 foo: direct index for structure (layout( row_major std140) uniform 4-component vector of float)
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0:6 'anon@0' (layout( row_major std140) uniform block{layout( row_major std140) uniform 4-component vector of float foo})
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0:6 Constant:
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0:6 0 (const uint)
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0:8 Sequence
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0:8 move second child to first child ( temp 2-element array of 2-component vector of float)
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0:8 'a1' ( global 2-element array of 2-component vector of float)
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0:8 Construct vec2 ( temp 2-element array of 2-component vector of float)
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0:8 Constant:
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0:8 1.000000
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0:8 2.000000
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0:8 Construct vec2 ( temp 2-component vector of float)
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0:8 direct index ( temp float)
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0:8 foo: direct index for structure (layout( row_major std140) uniform 4-component vector of float)
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0:8 'anon@0' (layout( row_major std140) uniform block{layout( row_major std140) uniform 4-component vector of float foo})
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0:8 Constant:
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0:8 0 (const uint)
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0:8 Constant:
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0:8 0 (const int)
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0:8 Constant:
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0:8 4.000000
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0:12 Function Definition: @main( ( temp 4-component vector of float)
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0:12 Function Parameters:
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0:? Sequence
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0:13 Branch: Return with expression
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0:13 'bar' ( global 4-component vector of float)
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0:12 Function Definition: main( ( temp void)
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0:12 Function Parameters:
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0:? Sequence
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0:12 move second child to first child ( temp 4-component vector of float)
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0:? '@entryPointOutput' (layout( location=0) out 4-component vector of float)
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0:12 Function Call: @main( ( temp 4-component vector of float)
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0:? Linker Objects
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0:? 'anon@0' (layout( row_major std140) uniform block{layout( row_major std140) uniform 4-component vector of float foo})
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0:? 'bar' ( global 4-component vector of float)
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0:? 'a1' ( global 2-element array of 2-component vector of float)
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0:? 'a2' ( const 2-element array of 2-component vector of float)
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0:? 5.000000
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0:? 6.000000
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0:? 7.000000
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0:? 8.000000
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0:? '@entryPointOutput' (layout( location=0) out 4-component vector of float)
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Linked fragment stage:
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Shader version: 500
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gl_FragCoord origin is upper left
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0:? Sequence
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0:6 Sequence
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0:6 move second child to first child ( temp 4-component vector of float)
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0:6 'bar' ( global 4-component vector of float)
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0:6 foo: direct index for structure (layout( row_major std140) uniform 4-component vector of float)
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0:6 'anon@0' (layout( row_major std140) uniform block{layout( row_major std140) uniform 4-component vector of float foo})
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0:6 Constant:
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0:6 0 (const uint)
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0:8 Sequence
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0:8 move second child to first child ( temp 2-element array of 2-component vector of float)
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0:8 'a1' ( global 2-element array of 2-component vector of float)
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0:8 Construct vec2 ( temp 2-element array of 2-component vector of float)
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0:8 Constant:
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0:8 1.000000
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0:8 2.000000
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0:8 Construct vec2 ( temp 2-component vector of float)
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0:8 direct index ( temp float)
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0:8 foo: direct index for structure (layout( row_major std140) uniform 4-component vector of float)
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0:8 'anon@0' (layout( row_major std140) uniform block{layout( row_major std140) uniform 4-component vector of float foo})
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0:8 Constant:
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0:8 0 (const uint)
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0:8 Constant:
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0:8 0 (const int)
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0:8 Constant:
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0:8 4.000000
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0:12 Function Definition: @main( ( temp 4-component vector of float)
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0:12 Function Parameters:
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0:? Sequence
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0:13 Branch: Return with expression
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0:13 'bar' ( global 4-component vector of float)
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0:12 Function Definition: main( ( temp void)
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0:12 Function Parameters:
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0:? Sequence
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0:12 move second child to first child ( temp 4-component vector of float)
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0:? '@entryPointOutput' (layout( location=0) out 4-component vector of float)
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0:12 Function Call: @main( ( temp 4-component vector of float)
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0:? Linker Objects
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0:? 'anon@0' (layout( row_major std140) uniform block{layout( row_major std140) uniform 4-component vector of float foo})
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0:? 'bar' ( global 4-component vector of float)
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0:? 'a1' ( global 2-element array of 2-component vector of float)
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0:? 'a2' ( const 2-element array of 2-component vector of float)
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0:? 5.000000
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0:? 6.000000
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0:? 7.000000
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0:? 8.000000
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0:? '@entryPointOutput' (layout( location=0) out 4-component vector of float)
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// Module Version 10000
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// Generated by (magic number): 80001
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// Id's are bound by 50
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Capability Shader
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1: ExtInstImport "GLSL.std.450"
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MemoryModel Logical GLSL450
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EntryPoint Fragment 4 "main" 41
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ExecutionMode 4 OriginUpperLeft
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Source HLSL 500
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Name 4 "main"
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Name 9 "@main("
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Name 12 "bar"
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Name 13 "CB"
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MemberName 13(CB) 0 "foo"
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Name 15 ""
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Name 26 "a1"
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Name 41 "@entryPointOutput"
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MemberDecorate 13(CB) 0 Offset 0
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Decorate 13(CB) Block
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Decorate 15 DescriptorSet 0
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Decorate 41(@entryPointOutput) Location 0
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2: TypeVoid
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3: TypeFunction 2
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6: TypeFloat 32
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7: TypeVector 6(float) 4
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8: TypeFunction 7(fvec4)
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11: TypePointer Private 7(fvec4)
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12(bar): 11(ptr) Variable Private
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13(CB): TypeStruct 7(fvec4)
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14: TypePointer Uniform 13(CB)
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15: 14(ptr) Variable Uniform
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16: TypeInt 32 1
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17: 16(int) Constant 0
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18: TypePointer Uniform 7(fvec4)
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21: TypeVector 6(float) 2
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22: TypeInt 32 0
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23: 22(int) Constant 2
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24: TypeArray 21(fvec2) 23
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25: TypePointer Private 24
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26(a1): 25(ptr) Variable Private
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27: 6(float) Constant 1065353216
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28: 6(float) Constant 1073741824
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29: 21(fvec2) ConstantComposite 27 28
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30: 22(int) Constant 0
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31: TypePointer Uniform 6(float)
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34: 6(float) Constant 1082130432
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40: TypePointer Output 7(fvec4)
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41(@entryPointOutput): 40(ptr) Variable Output
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43: 6(float) Constant 1084227584
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44: 6(float) Constant 1086324736
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45: 21(fvec2) ConstantComposite 43 44
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46: 6(float) Constant 1088421888
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47: 6(float) Constant 1090519040
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48: 21(fvec2) ConstantComposite 46 47
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49: 24 ConstantComposite 45 48
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4(main): 2 Function None 3
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5: Label
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19: 18(ptr) AccessChain 15 17
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20: 7(fvec4) Load 19
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Store 12(bar) 20
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32: 31(ptr) AccessChain 15 17 30
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33: 6(float) Load 32
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35: 21(fvec2) CompositeConstruct 33 34
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36: 24 CompositeConstruct 29 35
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Store 26(a1) 36
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42: 7(fvec4) FunctionCall 9(@main()
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Store 41(@entryPointOutput) 42
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Return
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FunctionEnd
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9(@main(): 7(fvec4) Function None 8
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10: Label
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37: 7(fvec4) Load 12(bar)
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ReturnValue 37
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FunctionEnd
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14
Test/hlsl.global-const-init.frag
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14
Test/hlsl.global-const-init.frag
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cbuffer CB {
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float4 foo;
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};
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static const float4 bar = foo; // test const (in the immutable sense) initializer from non-const.
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static const float2 a1[2] = { { 1, 2 }, { foo.x, 4 } }; // not entirely constant
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static const float2 a2[2] = { { 5, 6 }, { 7, 8 } }; // entirely constant
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float4 main() : SV_Target0
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{
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return bar;
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}
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@ -137,6 +137,7 @@ INSTANTIATE_TEST_CASE_P(
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{"hlsl.getdimensions.rw.dx10.frag", "main"},
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{"hlsl.getdimensions.dx10.vert", "main"},
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{"hlsl.getsampleposition.dx10.frag", "main"},
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{"hlsl.global-const-init.frag", "main"},
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{"hlsl.domain.1.tese", "main"},
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{"hlsl.domain.2.tese", "main"},
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{"hlsl.domain.3.tese", "main"},
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@ -2553,8 +2553,19 @@ bool HlslGrammar::acceptInitializer(TIntermTyped*& node)
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expected("assignment expression in initializer list");
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return false;
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}
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const bool firstNode = (node == nullptr);
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node = intermediate.growAggregate(node, expr, loc);
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// If every sub-node in the list has qualifier EvqConst, the returned node becomes
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// EvqConst. Otherwise, it becomes EvqTemporary. That doesn't happen with e.g.
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// EvqIn or EvqPosition, since the collection isn't EvqPosition if all the members are.
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if (firstNode && expr->getQualifier().storage == EvqConst)
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node->getQualifier().storage = EvqConst;
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else if (expr->getQualifier().storage != EvqConst)
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node->getQualifier().storage = EvqTemporary;
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// COMMA
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if (acceptTokenClass(EHTokComma)) {
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if (acceptTokenClass(EHTokRightBrace)) // allow trailing comma
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if (voidErrorCheck(loc, identifier, type.getBasicType()))
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return nullptr;
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// Global consts with initializers that are non-const act like EvqGlobal in HLSL.
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// This test is implicitly recursive, because initializers propagate constness
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// up the aggregate node tree during creation. E.g, for:
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// { { 1, 2 }, { 3, 4 } }
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// the initializer list is marked EvqConst at the top node, and remains so here. However:
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// { 1, { myvar, 2 }, 3 }
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// is not a const intializer, and still becomes EvqGlobal here.
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const bool nonConstInitializer = (initializer != nullptr && initializer->getQualifier().storage != EvqConst);
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if (type.getQualifier().storage == EvqConst && symbolTable.atGlobalLevel() && nonConstInitializer) {
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// Force to global
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type.getQualifier().storage = EvqGlobal;
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}
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// make const and initialization consistent
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fixConstInit(loc, identifier, type, initializer);
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@ -7345,11 +7360,6 @@ TIntermNode* HlslParseContext::executeInitializer(const TSourceLoc& loc, TInterm
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variable->getWritableType().getQualifier().storage = EvqTemporary;
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return nullptr;
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}
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if (qualifier == EvqConst && symbolTable.atGlobalLevel() && initializer->getType().getQualifier().storage != EvqConst) {
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error(loc, "global const initializers must be constant", "=", "'%s'", variable->getType().getCompleteString().c_str());
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variable->getWritableType().getQualifier().storage = EvqTemporary;
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return nullptr;
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}
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// Const variables require a constant initializer
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if (qualifier == EvqConst) {
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