Add GSP::GPU::AcquireRight

include/kernel/kernel.hpp

@@ -74,7 +74,8 @@ class Kernel {
 	void outputDebugString();
 
 public:
-	Kernel(std::array<u32, 16>& regs, Memory& mem) : regs(regs), mem(mem), handleCounter(0), serviceManager(regs, mem) {
+	Kernel(std::array<u32, 16>& regs, Memory& mem) 
+		: regs(regs), mem(mem), handleCounter(0), serviceManager(regs, mem, currentProcess) {
 		objects.reserve(512); // Make room for a few objects to avoid further memory allocs later
 		portHandles.reserve(32);
 	}

include/opengl.hpp

@@ -331,6 +331,17 @@ namespace OpenGL {
         }
     };
 
+    enum DepthFunc {
+        Never = GL_NEVER,       // Depth test never passes
+        Always = GL_ALWAYS,     // Depth test always passes
+        Equal = GL_EQUAL,       // Depth test passes if frag z == depth buffer z
+        NotEqual = GL_NOTEQUAL, // Depth test passes if frag z != depth buffer z
+        Less = GL_LESS,         // Depth test passes if frag z < depth buffer z
+        Lequal = GL_LEQUAL,     // Depth test passes if frag z <= depth buffer z
+        Greater = GL_GREATER,   // Depth test passes if frag z > depth buffer z
+        Gequal = GL_GEQUAL,     // Depth test passes if frag z >= depth buffer z 
+    };
+
     static void setClearColor(float val) { glClearColor(val, val, val, val); }
     static void setClearColor(float r, float g, float b, float a) { glClearColor(r, g, b, a); }
     static void setClearDepth(float depth) { glClearDepthf(depth); }
@@ -359,6 +370,8 @@ namespace OpenGL {
     static void enableStencil() { glEnable(GL_STENCIL_TEST); }
     static void disableStencil() { glDisable(GL_STENCIL_TEST); }
 
+    static void setDepthFunc(DepthFunc func) { glDepthFunc(static_cast<GLenum>(func)); }
+
     enum Primitives {
         Triangle = GL_TRIANGLES,
         Triangles = Triangle,

include/services/gsp_gpu.hpp

@@ -6,11 +6,17 @@
 class GPUService {
 	Handle handle = KernelHandles::GPU;
 	Memory& mem;
+	u32& currentPID; // Process ID of the current process
+
+	// At any point in time only 1 process has privileges to use rendering functions
+	// This is the PID of that process
+	u32 privilegedProcess;
 
 	// Service commands
+	void acquireRight(u32 messagePointer);
 
 public:
-	GPUService(Memory& mem) : mem(mem) {}
+	GPUService(Memory& mem, u32& currentPID) : mem(mem), currentPID(currentPID) {}
 	void reset();
 	void handleSyncRequest(u32 messagePointer);
 };

include/services/service_manager.hpp

@@ -23,7 +23,7 @@ class ServiceManager {
 	void registerClient(u32 messagePointer);
 
 public:
-	ServiceManager(std::array<u32, 16>& regs, Memory& mem);
+	ServiceManager(std::array<u32, 16>& regs, Memory& mem, u32& currentPID);
 	void reset();
 	void handleSyncRequest(u32 messagePointer);
 

src/core/services/gsp_gpu.cpp

@@ -2,6 +2,7 @@
 
 namespace GPUCommands {
 	enum : u32 {
+		AcquireRight = 0x00160042
 	};
 }
 
@@ -11,11 +12,32 @@ namespace Result {
 	};
 }
 
-void GPUService::reset() {}
+void GPUService::reset() {
+	privilegedProcess = 0xFFFFFFFF; // Set the privileged process to an invalid handle
+}
 
 void GPUService::handleSyncRequest(u32 messagePointer) {
 	const u32 command = mem.read32(messagePointer);
 	switch (command) {
-		default: Helpers::panic("GPU service requested. Command: %08X\n", command);
+		case GPUCommands::AcquireRight: acquireRight(messagePointer); break;
+;		default: Helpers::panic("GPU service requested. Command: %08X\n", command);
 	}
+}
+
+void GPUService::acquireRight(u32 messagePointer) {
+	const u32 flag = mem.read32(messagePointer + 4);
+	const u32 pid = mem.read32(messagePointer + 12);
+	printf("GSP::GPU::acquireRight (flag = %d, pid = %X)\n", flag, pid);
+
+	if (flag != 0) {
+		Helpers::panic("GSP::GPU::acquireRight with flag != 0 needs to perform additional initialization");
+	}
+
+	if (pid == KernelHandles::CurrentProcess) {
+		privilegedProcess = currentPID;
+	} else {
+		privilegedProcess = pid;
+	}
+
+	mem.write32(messagePointer + 4, Result::Success);
 }

src/core/services/service_manager.cpp

@@ -1,8 +1,7 @@
 #include "services/service_manager.hpp"
 
-ServiceManager::ServiceManager(std::array<u32, 16>& regs, Memory& mem) : regs(regs), mem(mem),
-																		 apt(mem), hid(mem), fs(mem),
-																		 gsp_gpu(mem), gsp_lcd(mem) {}
+ServiceManager::ServiceManager(std::array<u32, 16>& regs, Memory& mem, u32& currentPID)
+	: regs(regs), mem(mem), apt(mem), hid(mem), fs(mem), gsp_gpu(mem, currentPID), gsp_lcd(mem) {}
 
 void ServiceManager::reset() {
 	apt.reset();