Fix sksl spirv subpassLoad.

Bug: skia:10409
Change-Id: If8fba41470eddc72b397f46e4e0bb7bd7f4a3d5d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/315651
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>

Author: egdaniel

src/sksl/SkSLSPIRVCodeGenerator.cpp

@@ -851,9 +851,9 @@ SpvId SPIRVCodeGenerator::writeSpecialIntrinsic(const FunctionCall& c, SpecialIn
         case kSubpassLoad_SpecialIntrinsic: {
             SpvId img = this->writeExpression(*c.fArguments[0], out);
             std::vector<std::unique_ptr<Expression>> args;
-            args.emplace_back(new FloatLiteral(fContext, -1, 0.0));
-            args.emplace_back(new FloatLiteral(fContext, -1, 0.0));
-            Constructor ctor(-1, *fContext.fFloat2_Type, std::move(args));
+            args.emplace_back(new IntLiteral(fContext, -1, 0));
+            args.emplace_back(new IntLiteral(fContext, -1, 0));
+            Constructor ctor(-1, *fContext.fInt2_Type, std::move(args));
             SpvId coords = this->writeConstantVector(ctor);
             if (1 == c.fArguments.size()) {
                 this->writeInstruction(SpvOpImageRead,

src/sksl/generated/sksl_gpu.dehydrated.sksl

@@ -252,8 +252,8 @@ half4 sample($gsampler2DRect sampler, float3 P);
 
 // Currently we do not support the generic types of loading subpassInput so we have some explicit
 // versions that we currently use
-float4 subpassLoad(subpassInput subpass);
-float4 subpassLoad(subpassInputMS subpass, int sample);
+half4 subpassLoad(subpassInput subpass);
+half4 subpassLoad(subpassInputMS subpass, int sample);
 
 half4 sample($gsampler1D sampler, float2 P);
 half4 sample($gsampler1D sampler, float2 P, float bias);