[PICA] Start implementing shader interpreter

src/core/PICA/shader_interpreter.cpp

@@ -0,0 +1,14 @@
+#include "PICA/shader.hpp"
+
+void PICAShader::run() {
+	u32 pc = 0; // Program counter
+
+	while (true) {
+		const u32 instruction = loadedShader[pc++];
+		const u32 opcode = instruction >> 26; // Top 6 bits are the opcode
+
+		switch (opcode) {
+			default:Helpers::panic("Unimplemented PICA instruction %08X (Opcode = %02X)", instruction, opcode);
+		}
+	}
+}