Add helper uniforms to Runtime Effect tests.

This lets us use descriptive names like `colorRed` and `colorGreen`
instead of `half4(1,0,0,1)` and `half4(0,1,0,1)`. It also lets us use
actual unknown values instead of synthesizing sorta-kinda-unknowns by
calling sqrt.

Change-Id: I61481c33b7ff42182955777b05cfa5fcc13e0efc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/359567
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>

resources/sksl/folding/BoolFolding.sksl

@@ -1,3 +1,5 @@
+uniform half4 colorRed, colorGreen;
+
 bool test() {
     bool a = 1 == 1 || 2 == 8;
     bool b = 1 > 1  || 2 == 8;
@@ -14,6 +16,6 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }
 

resources/sksl/folding/FloatFolding.sksl

@@ -1,3 +1,5 @@
+uniform half4 colorRed, colorGreen;
+
 bool test() {
     bool ok = true;
     half x = 32.0 + 2.0;
@@ -74,5 +76,5 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }

resources/sksl/folding/IntFoldingES2.sksl

@@ -1,5 +1,8 @@
+uniform half4 colorRed, colorGreen;
+uniform half  unknownInput;
+
 bool test() {
-    int unknown = int(sqrt(1));
+    int unknown = int(unknownInput);
 
     bool ok = true;
     int x = 32 + 2;
@@ -72,5 +75,5 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }

resources/sksl/folding/IntFoldingES3.sksl

@@ -1,3 +1,5 @@
+uniform half4 colorRed, colorGreen;
+
 bool test() {
     bool ok = true;
     int x = 12 | 6;
@@ -16,5 +18,5 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }

resources/sksl/folding/MatrixFoldingES2.sksl

@@ -1,3 +1,5 @@
+uniform half4 colorRed, colorGreen;
+
 bool test() {
     bool ok = true;
     ok = ok &&  (float2x2(float2(1.0, 0.0), float2(0.0, 1.0)) ==
@@ -23,5 +25,5 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }

resources/sksl/folding/MatrixFoldingES3.sksl

@@ -1,3 +1,5 @@
+uniform half4 colorRed, colorGreen;
+
 bool test() {
     bool ok = true;
     ok = ok &&  (float3x2(2) == float3x2(float2(2.0, 0.0), float2(0.0, 2.0), float2(0.0)));
@@ -5,5 +7,5 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }

resources/sksl/folding/ShortCircuitBoolFolding.sksl

@@ -1,5 +1,8 @@
+uniform half4 colorRed, colorGreen;
+uniform half  unknownInput;
+
 bool test() {
-    bool expr = sqrt(1) > 0;
+    bool expr = unknownInput > 0;
 
     int ok = 0, bad = 0;
 
@@ -40,5 +43,5 @@ bool test() {
 }
 
 half4 main() {
-    return test() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test() ? colorGreen : colorRed;
 }

resources/sksl/folding/VectorScalarFolding.sksl

@@ -1,3 +1,6 @@
+uniform half4 colorRed, colorGreen;
+uniform half  unknownInput;
+
 bool test_half() {
     bool ok = true;
 
@@ -36,7 +39,7 @@ bool test_half() {
     ok = ok && (x == half4(6));
 
     // Vector op unknown scalar
-    half  unknown = half(sqrt(2));
+    half  unknown = unknownInput;
     x = half4(0) + unknown;
     ok = ok && (x == half4(unknown));
     x = half4(0) * unknown;
@@ -117,7 +120,7 @@ bool test_int() {
     ok = ok && (x == int4(6));
 
     // Vector op unknown scalar
-    int  unknown = int(sqrt(2));
+    int  unknown = int(unknownInput);
     x = int4(0) + unknown;
     ok = ok && (x == int4(unknown));
     x = int4(0) * unknown;
@@ -161,5 +164,5 @@ bool test_int() {
 }
 
 half4 main() {
-    return test_half() && test_int() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test_half() && test_int() ? colorGreen : colorRed;
 }

resources/sksl/folding/VectorVectorFolding.sksl

@@ -1,5 +1,8 @@
+uniform half  unknownInput;
+uniform half4 colorRed, colorGreen;
+
 bool test_half() {
-    half unknown = half(sqrt(1));
+    half unknown = unknownInput;
 
     bool ok = true;
     ok = ok &&  (half4(half2(1), half2(2, 3)) + half4(5, 6, 7, 8)) == half4(6, 7, 9, 11);
@@ -54,7 +57,7 @@ bool test_half() {
 }
 
 bool test_int() {
-    int unknown = int(sqrt(1));
+    int unknown = int(unknownInput);
 
     bool ok = true;
     ok = ok &&  (int4(int2(1), int2(2, 3)) + int4(5, 6, 7, 8)) == int4(6, 7, 9, 11);
@@ -109,5 +112,5 @@ bool test_int() {
 }
 
 half4 main() {
-    return test_half() && test_int() ? half4(0,1,0,1) : half4(1,0,0,1);
+    return test_half() && test_int() ? colorGreen : colorRed;
 }

resources/sksl/shared/ForLoopControlFlow.sksl

@@ -1,5 +1,7 @@
+uniform half4 colorWhite;
+
 half4 main() {
-    half4 x = half4(1, 1, 1, 1);
+    half4 x = colorWhite;
 
     // Verify that break is allowed in a for loop.
     for (half r = -5; r < 5; r += 1) {

src/sksl/SkSLMetalCodeGenerator.cpp

@@ -1476,7 +1476,7 @@ bool MetalCodeGenerator::writeFunctionDeclaration(const FunctionDeclaration& f)
                 if (var.var().type().typeKind() == Type::TypeKind::kSampler) {
                     if (var.var().modifiers().fLayout.fBinding < 0) {
                         fErrors.error(decls.fOffset,
-                                        "Metal samplers must have 'layout(binding=...)'");
+                                      "Metal samplers must have 'layout(binding=...)'");
                         return false;
                     }
                     if (var.var().type().dimensions() != SpvDim2D) {

tests/SkSLTest.cpp

@@ -24,6 +24,14 @@
 
 static const SkRect kRect = SkRect::MakeWH(1, 1);
 
+template <typename T>
+static void set_uniform(SkRuntimeShaderBuilder* builder, const char* name, const T& value) {
+    SkRuntimeShaderBuilder::BuilderUniform uniform = builder->uniform(name);
+    if (uniform.fVar) {
+        uniform = value;
+    }
+}
+
 static void test(skiatest::Reporter* r, SkSurface* surface, const char* testFile) {
     SkString resourcePath = SkStringPrintf("sksl/%s", testFile);
     sk_sp<SkData> shaderData = GetResourceAsData(resourcePath.c_str());
@@ -40,6 +48,13 @@ static void test(skiatest::Reporter* r, SkSurface* surface, const char* testFile
     }
 
     SkRuntimeShaderBuilder builder(effect);
+    set_uniform(&builder, "colorBlack",   SkV4{0, 0, 0, 1});
+    set_uniform(&builder, "colorRed",     SkV4{1, 0, 0, 1});
+    set_uniform(&builder, "colorGreen",   SkV4{0, 1, 0, 1});
+    set_uniform(&builder, "colorBlue",    SkV4{0, 0, 1, 1});
+    set_uniform(&builder, "colorWhite",   SkV4{1, 1, 1, 1});
+    set_uniform(&builder, "unknownInput", 1.0f);
+
     sk_sp<SkShader> shader = builder.makeShader(/*localMatrix=*/nullptr, /*isOpaque=*/true);
     if (!shader) {
         ERRORF(r, "%s: Unable to build shader", testFile);

tests/sksl/folding/BoolFolding.glsl

@@ -1,5 +1,7 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
 vec4 main() {
-    return vec4(0.0, 1.0, 0.0, 1.0);
+    return colorGreen;
 
 }

tests/sksl/folding/FloatFolding.glsl

@@ -1,4 +1,6 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
 vec4 main() {
     bool _1_ok = true;
     float _2_x = 34.0;
@@ -66,6 +68,6 @@ vec4 main() {
     _1_ok = _1_ok && _2_x == -2.0;
     _2_x /= 2.0;
     _1_ok = _1_ok && _2_x == -1.0;
-    return _1_ok ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
+    return _1_ok ? colorGreen : colorRed;
 
 }

tests/sksl/folding/IntFoldingES2.glsl

@@ -1,6 +1,9 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
+uniform float unknownInput;
 vec4 main() {
-    int _1_unknown = int(sqrt(1.0));
+    int _1_unknown = int(unknownInput);
     bool _2_ok = true;
     int _3_x = 34;
     _2_ok = true;
@@ -64,6 +67,6 @@ vec4 main() {
     _2_ok = _2_ok && _3_x == -2;
     _3_x /= 2;
     _2_ok = _2_ok && _3_x == -1;
-    return _2_ok ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
+    return _2_ok ? colorGreen : colorRed;
 
 }

tests/sksl/folding/IntFoldingES3.glsl

@@ -1,5 +1,7 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
 vec4 main() {
-    return vec4(0.0, 1.0, 0.0, 1.0);
+    return colorGreen;
 
 }

tests/sksl/folding/MatrixFoldingES2.glsl

@@ -1,5 +1,7 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
 vec4 main() {
-    return vec4(0.0, 1.0, 0.0, 1.0);
+    return colorGreen;
 
 }

tests/sksl/folding/MatrixFoldingES3.glsl

@@ -1,5 +1,7 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
 vec4 main() {
-    return vec4(0.0, 1.0, 0.0, 1.0);
+    return colorGreen;
 
 }

tests/sksl/folding/ShortCircuitBoolFolding.glsl

@@ -1,6 +1,9 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
+uniform float unknownInput;
 vec4 main() {
-    bool _1_expr = sqrt(1.0) > 0.0;
+    bool _1_expr = unknownInput > 0.0;
     int _2_ok = 0;
     int _3_bad = 0;
 
@@ -110,6 +113,6 @@ vec4 main() {
     } else {
         ++_3_bad;
     }
-    return _2_ok == 22 && _3_bad == 0 ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
+    return _2_ok == 22 && _3_bad == 0 ? colorGreen : colorRed;
 
 }

tests/sksl/folding/VectorScalarFolding.glsl

@@ -1,4 +1,7 @@
 
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
+uniform float unknownInput;
 bool test_int() {
     bool ok = true;
     ivec4 x = ivec4(6, 6, 7, 8);
@@ -27,7 +30,7 @@ bool test_int() {
     ok = ok;
     x = ivec4(6, 6, 6, 6);
     ok = ok;
-    int unknown = int(sqrt(2.0));
+    int unknown = int(unknownInput);
     x = ivec4(unknown);
     ok = ok && x == ivec4(unknown);
     x = ivec4(0);
@@ -90,7 +93,7 @@ vec4 main() {
     _1_ok = _1_ok;
     _2_x = vec4(6.0, 6.0, 6.0, 6.0);
     _1_ok = _1_ok;
-    float _3_unknown = sqrt(2.0);
+    float _3_unknown = unknownInput;
     _2_x = vec4(_3_unknown);
     _1_ok = _1_ok && _2_x == vec4(_3_unknown);
     _2_x = vec4(0.0);
@@ -123,6 +126,6 @@ vec4 main() {
     _1_ok = _1_ok && _2_x == vec4(_3_unknown);
     _2_x = vec4(_3_unknown);
     _1_ok = _1_ok && _2_x == vec4(_3_unknown);
-    return _1_ok && test_int() ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
+    return _1_ok && test_int() ? colorGreen : colorRed;
 
 }

tests/sksl/folding/VectorVectorFolding.glsl

@@ -1,6 +1,9 @@
 
+uniform float unknownInput;
+uniform vec4 colorRed;
+uniform vec4 colorGreen;
 bool test_int() {
-    int unknown = int(sqrt(1.0));
+    int unknown = int(unknownInput);
     bool ok = true;
     ok = true;
     ok = true;
@@ -47,7 +50,7 @@ bool test_int() {
     return ok;
 }
 vec4 main() {
-    float _1_unknown = sqrt(1.0);
+    float _1_unknown = unknownInput;
     bool _2_ok = true;
     _2_ok = true;
     _2_ok = true;
@@ -91,6 +94,6 @@ vec4 main() {
     _3_val *= vec4(2.0);
     _3_val /= vec4(2.0);
     _2_ok = _2_ok && _3_val == vec4(_1_unknown);
-    return _2_ok && test_int() ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
+    return _2_ok && test_int() ? colorGreen : colorRed;
 
 }

tests/sksl/shared/ForLoopControlFlow.asm.frag

@@ -9,107 +9,113 @@ OpMemoryModel Logical GLSL450
 OpEntryPoint Fragment %main "main" %sk_Clockwise
 OpExecutionMode %main OriginUpperLeft
 OpName %sk_Clockwise "sk_Clockwise"
+OpName %colorWhite "colorWhite"
 OpName %main "main"
 OpName %x "x"
 OpName %r "r"
 OpName %b "b"
 OpDecorate %sk_Clockwise RelaxedPrecision
 OpDecorate %sk_Clockwise BuiltIn FrontFacing
-OpDecorate %22 RelaxedPrecision
-OpDecorate %26 RelaxedPrecision
-OpDecorate %30 RelaxedPrecision
-OpDecorate %36 RelaxedPrecision
+OpDecorate %colorWhite RelaxedPrecision
+OpDecorate %colorWhite DescriptorSet 0
+OpDecorate %14 RelaxedPrecision
+OpDecorate %23 RelaxedPrecision
+OpDecorate %27 RelaxedPrecision
+OpDecorate %31 RelaxedPrecision
 OpDecorate %37 RelaxedPrecision
-OpDecorate %44 RelaxedPrecision
+OpDecorate %39 RelaxedPrecision
 OpDecorate %46 RelaxedPrecision
-OpDecorate %49 RelaxedPrecision
-OpDecorate %56 RelaxedPrecision
-OpDecorate %57 RelaxedPrecision
+OpDecorate %48 RelaxedPrecision
+OpDecorate %51 RelaxedPrecision
 OpDecorate %58 RelaxedPrecision
+OpDecorate %59 RelaxedPrecision
+OpDecorate %60 RelaxedPrecision
 %bool = OpTypeBool
 %_ptr_Input_bool = OpTypePointer Input %bool
 %sk_Clockwise = OpVariable %_ptr_Input_bool Input
 %float = OpTypeFloat 32
 %v4float = OpTypeVector %float 4
-%8 = OpTypeFunction %v4float
+%_ptr_Uniform_v4float = OpTypePointer Uniform %v4float
+%colorWhite = OpVariable %_ptr_Uniform_v4float Uniform
+%10 = OpTypeFunction %v4float
 %_ptr_Function_v4float = OpTypePointer Function %v4float
-%float_1 = OpConstant %float 1
-%13 = OpConstantComposite %v4float %float_1 %float_1 %float_1 %float_1
 %_ptr_Function_float = OpTypePointer Function %float
 %float_n5 = OpConstant %float -5
 %float_5 = OpConstant %float 5
 %int = OpTypeInt 32 1
 %int_0 = OpConstant %int 0
 %float_0 = OpConstant %float 0
+%float_1 = OpConstant %float 1
 %int_2 = OpConstant %int 2
 %int_1 = OpConstant %int 1
-%main = OpFunction %v4float None %8
-%9 = OpLabel
+%main = OpFunction %v4float None %10
+%11 = OpLabel
 %x = OpVariable %_ptr_Function_v4float Function
 %r = OpVariable %_ptr_Function_float Function
 %b = OpVariable %_ptr_Function_float Function
-OpStore %x %13
+%14 = OpLoad %v4float %colorWhite
+OpStore %x %14
 OpStore %r %float_n5
-OpBranch %17
-%17 = OpLabel
-OpLoopMerge %21 %20 None
 OpBranch %18
 %18 = OpLabel
-%22 = OpLoad %float %r
-%24 = OpFOrdLessThan %bool %22 %float_5
-OpBranchConditional %24 %19 %21
+OpLoopMerge %22 %21 None
+OpBranch %19
 %19 = OpLabel
-%26 = OpLoad %float %r
-%25 = OpExtInst %float %1 FAbs %26
-%27 = OpAccessChain %_ptr_Function_float %x %int_0
-OpStore %27 %25
-%30 = OpLoad %v4float %x
-%31 = OpCompositeExtract %float %30 0
-%33 = OpFOrdEqual %bool %31 %float_0
-OpSelectionMerge %35 None
-OpBranchConditional %33 %34 %35
-%34 = OpLabel
-OpBranch %21
-%35 = OpLabel
-OpBranch %20
+%23 = OpLoad %float %r
+%25 = OpFOrdLessThan %bool %23 %float_5
+OpBranchConditional %25 %20 %22
 %20 = OpLabel
-%36 = OpLoad %float %r
-%37 = OpFAdd %float %36 %float_1
-OpStore %r %37
-OpBranch %17
+%27 = OpLoad %float %r
+%26 = OpExtInst %float %1 FAbs %27
+%28 = OpAccessChain %_ptr_Function_float %x %int_0
+OpStore %28 %26
+%31 = OpLoad %v4float %x
+%32 = OpCompositeExtract %float %31 0
+%34 = OpFOrdEqual %bool %32 %float_0
+OpSelectionMerge %36 None
+OpBranchConditional %34 %35 %36
+%35 = OpLabel
+OpBranch %22
+%36 = OpLabel
+OpBranch %21
 %21 = OpLabel
+%37 = OpLoad %float %r
+%39 = OpFAdd %float %37 %float_1
+OpStore %r %39
+OpBranch %18
+%22 = OpLabel
 OpStore %b %float_5
-OpBranch %39
-%39 = OpLabel
-OpLoopMerge %43 %42 None
-OpBranch %40
-%40 = OpLabel
-%44 = OpLoad %float %b
-%45 = OpFOrdGreaterThanEqual %bool %44 %float_0
-OpBranchConditional %45 %41 %43
+OpBranch %41
 %41 = OpLabel
-%46 = OpLoad %float %b
-%47 = OpAccessChain %_ptr_Function_float %x %int_2
-OpStore %47 %46
-%49 = OpLoad %v4float %x
-%50 = OpCompositeExtract %float %49 3
-%51 = OpFOrdEqual %bool %50 %float_1
-OpSelectionMerge %53 None
-OpBranchConditional %51 %52 %53
-%52 = OpLabel
-OpBranch %42
-%53 = OpLabel
-%54 = OpAccessChain %_ptr_Function_float %x %int_1
-OpStore %54 %float_0
+OpLoopMerge %45 %44 None
 OpBranch %42
 %42 = OpLabel
-%56 = OpLoad %float %b
-%57 = OpFSub %float %56 %float_1
-OpStore %b %57
-OpBranch %39
+%46 = OpLoad %float %b
+%47 = OpFOrdGreaterThanEqual %bool %46 %float_0
+OpBranchConditional %47 %43 %45
 %43 = OpLabel
-%58 = OpLoad %v4float %x
-OpReturnValue %58
+%48 = OpLoad %float %b
+%49 = OpAccessChain %_ptr_Function_float %x %int_2
+OpStore %49 %48
+%51 = OpLoad %v4float %x
+%52 = OpCompositeExtract %float %51 3
+%53 = OpFOrdEqual %bool %52 %float_1
+OpSelectionMerge %55 None
+OpBranchConditional %53 %54 %55
+%54 = OpLabel
+OpBranch %44
+%55 = OpLabel
+%56 = OpAccessChain %_ptr_Function_float %x %int_1
+OpStore %56 %float_0
+OpBranch %44
+%44 = OpLabel
+%58 = OpLoad %float %b
+%59 = OpFSub %float %58 %float_1
+OpStore %b %59
+OpBranch %41
+%45 = OpLabel
+%60 = OpLoad %v4float %x
+OpReturnValue %60
 OpFunctionEnd
 
 1 error

tests/sksl/shared/ForLoopControlFlow.glsl

@@ -1,6 +1,7 @@
 
+uniform vec4 colorWhite;
 vec4 main() {
-    vec4 x = vec4(1.0, 1.0, 1.0, 1.0);
+    vec4 x = colorWhite;
     for (float r = -5.0;r < 5.0; r += 1.0) {
         x.x = abs(r);
         if (x.x == 0.0) break;

tests/sksl/shared/ForLoopControlFlow.metal

@@ -1,15 +1,19 @@
 #include <metal_stdlib>
 #include <simd/simd.h>
 using namespace metal;
+struct Uniforms {
+    float4 colorWhite;
+};
 struct Inputs {
 };
 struct Outputs {
     float4 sk_FragColor [[color(0)]];
 };
-fragment Outputs fragmentMain(Inputs _in [[stage_in]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
+
+fragment Outputs fragmentMain(Inputs _in [[stage_in]], constant Uniforms& _uniforms [[buffer(0)]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
     Outputs _out;
     (void)_out;
-    float4 x = float4(1.0, 1.0, 1.0, 1.0);
+    float4 x = _uniforms.colorWhite;
     for (float r = -5.0;r < 5.0; r += 1.0) {
         x.x = abs(r);
         if (x.x == 0.0) break;