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HLSL: cast bracket dereference index to int type if not.

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HLSL can index arrays using operator[] with non-integer types, and
inserts a conversion to a uint if needed.
This commit is contained in:
steve-lunarg 2017-04-06 20:22:20 -06:00
parent 38a425355b
commit 2efd6c6d0c
5 changed files with 175 additions and 0 deletions
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151
Test/baseResults/hlsl.nonint-index.frag.out Normal file
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@ -0,0 +1,151 @@
hlsl.nonint-index.frag
Shader version: 450
gl_FragCoord origin is upper left
0:? Sequence
0:4 Function Definition: @main(f1; ( temp float)
0:4 Function Parameters:
0:4 'input' ( in float)
0:? Sequence
0:7 Branch: Return with expression
0:7 add ( temp float)
0:7 add ( temp float)
0:7 add ( temp float)
0:7 indirect index ( temp float)
0:7 Constant:
0:7 1.000000
0:7 2.000000
0:7 3.000000
0:7 Convert float to uint ( temp uint)
0:7 'input' ( in float)
0:7 Constant:
0:7 3.000000
0:7 Constant:
0:7 2.000000
0:7 Constant:
0:7 1.000000
0:4 Function Definition: main( ( temp void)
0:4 Function Parameters:
0:? Sequence
0:4 move second child to first child ( temp float)
0:? 'input' ( temp float)
0:? 'input' (layout( location=0) in float)
0:4 move second child to first child ( temp float)
0:? '@entryPointOutput' (layout( location=0) out float)
0:4 Function Call: @main(f1; ( temp float)
0:? 'input' ( temp float)
0:? Linker Objects
0:? 'array' ( const 3-element array of float)
0:? 1.000000
0:? 2.000000
0:? 3.000000
0:? '@entryPointOutput' (layout( location=0) out float)
0:? 'input' (layout( location=0) in float)
Linked fragment stage:
Shader version: 450
gl_FragCoord origin is upper left
0:? Sequence
0:4 Function Definition: @main(f1; ( temp float)
0:4 Function Parameters:
0:4 'input' ( in float)
0:? Sequence
0:7 Branch: Return with expression
0:7 add ( temp float)
0:7 add ( temp float)
0:7 add ( temp float)
0:7 indirect index ( temp float)
0:7 Constant:
0:7 1.000000
0:7 2.000000
0:7 3.000000
0:7 Convert float to uint ( temp uint)
0:7 'input' ( in float)
0:7 Constant:
0:7 3.000000
0:7 Constant:
0:7 2.000000
0:7 Constant:
0:7 1.000000
0:4 Function Definition: main( ( temp void)
0:4 Function Parameters:
0:? Sequence
0:4 move second child to first child ( temp float)
0:? 'input' ( temp float)
0:? 'input' (layout( location=0) in float)
0:4 move second child to first child ( temp float)
0:? '@entryPointOutput' (layout( location=0) out float)
0:4 Function Call: @main(f1; ( temp float)
0:? 'input' ( temp float)
0:? Linker Objects
0:? 'array' ( const 3-element array of float)
0:? 1.000000
0:? 2.000000
0:? 3.000000
0:? '@entryPointOutput' (layout( location=0) out float)
0:? 'input' (layout( location=0) in float)
// Module Version 10000
// Generated by (magic number): 80001
// Id's are bound by 39
Capability Shader
1: ExtInstImport "GLSL.std.450"
MemoryModel Logical GLSL450
EntryPoint Fragment 4 "main" 32 35
ExecutionMode 4 OriginUpperLeft
Name 4 "main"
Name 10 "@main(f1;"
Name 9 "input"
Name 22 "indexable"
Name 30 "input"
Name 32 "input"
Name 35 "@entryPointOutput"
Name 36 "param"
Decorate 32(input) Location 0
Decorate 35(@entryPointOutput) Location 0
2: TypeVoid
3: TypeFunction 2
6: TypeFloat 32
7: TypePointer Function 6(float)
8: TypeFunction 6(float) 7(ptr)
12: TypeInt 32 0
13: 12(int) Constant 3
14: TypeArray 6(float) 13
15: 6(float) Constant 1065353216
16: 6(float) Constant 1073741824
17: 6(float) Constant 1077936128
18: 14 ConstantComposite 15 16 17
21: TypePointer Function 14
31: TypePointer Input 6(float)
32(input): 31(ptr) Variable Input
34: TypePointer Output 6(float)
35(@entryPointOutput): 34(ptr) Variable Output
4(main): 2 Function None 3
5: Label
30(input): 7(ptr) Variable Function
36(param): 7(ptr) Variable Function
33: 6(float) Load 32(input)
Store 30(input) 33
37: 6(float) Load 30(input)
Store 36(param) 37
38: 6(float) FunctionCall 10(@main(f1;) 36(param)
Store 35(@entryPointOutput) 38
Return
FunctionEnd
10(@main(f1;): 6(float) Function None 8
9(input): 7(ptr) FunctionParameter
11: Label
22(indexable): 21(ptr) Variable Function
19: 6(float) Load 9(input)
20: 12(int) ConvertFToU 19
Store 22(indexable) 18
23: 7(ptr) AccessChain 22(indexable) 20
24: 6(float) Load 23
25: 6(float) FAdd 24 17
26: 6(float) FAdd 25 16
27: 6(float) FAdd 26 15
ReturnValue 27
FunctionEnd

9
Test/hlsl.nonint-index.frag Normal file
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@ -0,0 +1,9 @@
static const float array[3] = { 1, 2, 3 };
float main(float input : IN) : SV_Target0
{
// non-integer indexes get converted to uints:
// uint(input) 3.0 2.0 1.0
return array[input] + array[2.0] + array[true] + array[false];
}

1
gtests/Hlsl.FromFile.cpp
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@ -171,6 +171,7 @@ INSTANTIATE_TEST_CASE_P(
{"hlsl.logicalConvert.frag", "main"},
{"hlsl.logical.unary.frag", "main"},
{"hlsl.namespace.frag", "main"},
{"hlsl.nonint-index.frag", "main"},
{"hlsl.matNx1.frag", "main"},
{"hlsl.matrixSwizzle.vert", "ShaderFunction"},
{"hlsl.mintypes.frag", "main"},

2
hlsl/hlslGrammar.cpp
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@ -2816,6 +2816,8 @@ bool HlslGrammar::acceptPostfixExpression(TIntermTyped*& node)
}
advanceToken();
node = parseContext.handleBracketDereference(indexNode->getLoc(), node, indexNode);
if (node == nullptr)
return false;
break;
}
case EOpPostIncrement:

12
hlsl/hlslParseHelper.cpp
View File

@ -722,6 +722,18 @@ TIntermTyped* HlslParseContext::handleBracketDereference(const TSourceLoc& loc,
if (result != nullptr)
return result; // it was handled as an operator[]
const TBasicType indexBasicType = index->getType().getBasicType();
// Cast index to unsigned integer if it isn't one.
if (indexBasicType != EbtInt && indexBasicType != EbtUint &&
indexBasicType != EbtInt64 && indexBasicType != EbtUint64)
index = intermediate.addConversion(EOpConstructUint, TType(EbtUint), index);
if (index == nullptr) {
error(loc, " unknown undex type ", "", "");
return nullptr;
}
bool flattened = false;
int indexValue = 0;
if (index->getQualifier().storage == EvqConst) {