Make Constants a singleton instead of a global

src/Device/Renderer.cpp

@@ -147,7 +147,7 @@ inline bool setBatchIndices(unsigned int batch[128][3], VkPrimitiveTopology topo
 DrawCall::DrawCall()
 {
 	data = (DrawData *)allocate(sizeof(DrawData));
-	data->constants = &constants;
+	data->constants = &Constants::Get();
 }
 
 DrawCall::~DrawCall()

src/Pipeline/ComputeProgram.cpp

@@ -234,7 +234,7 @@ void ComputeProgram::run(
 	data.invocationsPerWorkgroup = invocationsPerWorkgroup;
 	data.subgroupsPerWorkgroup = subgroupsPerWorkgroup;
 	data.pushConstants = pushConstants;
-	data.constants = &sw::constants;
+	data.constants = &sw::Constants::Get();
 
 	marl::WaitGroup wg;
 	const uint32_t batchCount = 16;

src/Pipeline/Constants.cpp

@@ -21,7 +21,11 @@
 
 namespace sw {
 
-Constants constants;
+const Constants &Constants::Get()
+{
+	static const Constants constants;
+	return constants;
+}
 
 Constants::Constants()
 {

src/Pipeline/Constants.hpp

@@ -23,7 +23,7 @@ namespace sw {
 
 struct Constants
 {
-	Constants();
+	static const Constants &Get();
 
 	unsigned int transposeBit0[16];
 	unsigned int transposeBit1[16];
@@ -138,9 +138,10 @@ struct Constants
 	float4 unscaleFixed;
 
 	float half2float[65536];
-};
 
-extern Constants constants;
+private:
+	Constants();
+};
 
 }  // namespace sw