[PICA] Implement int uniforms

src/core/PICA/regs.cpp

@@ -100,6 +100,10 @@ void GPU::writeInternalReg(u32 index, u32 value, u32 mask) {
 			shaderUnit.vs.uploadDescriptor(value);
 			break;
 
+		case VertexIntUniform0: case VertexIntUniform1: case VertexIntUniform2: case VertexIntUniform3:
+			shaderUnit.vs.uploadIntUniform(index - VertexIntUniform0, value);
+			break;
+
 		case VertexShaderTransferEnd:
 			if (value != 0) shaderUnit.vs.finalize();
 			break;

src/core/PICA/shader_interpreter.cpp

@@ -1,7 +1,7 @@
 #include "PICA/shader.hpp"
 
 void PICAShader::run() {
-	u32 pc = 0; // Program counter
+	pc = 0;
 
 	while (true) {
 		const u32 instruction = loadedShader[pc++];

src/core/PICA/shader_unit.cpp

@@ -10,7 +10,6 @@ void PICAShader::reset() {
 	bufferedShader.fill(0);
 	operandDescriptors.fill(0);
 
-	intUniforms.fill(0);
 	boolUniform = 0;
 	bufferIndex = 0;
 	floatUniformIndex = 0;
@@ -24,6 +23,10 @@ void PICAShader::reset() {
 	outputs.fill(zero);
 	tempRegisters.fill(zero);
 
+	for (auto& e : intUniforms) {
+		e.x() = e.y() = e.z() = e.w() = 0;
+	}
+
 	addrRegister.x() = 0;
 	addrRegister.y() = 0;
 	loopCounter = 0;