Moar appletting

include/applets/applet.hpp

@@ -65,10 +65,11 @@ namespace Applets {
 	};
 
 	struct Parameter {
-		u32 senderID;
-		u32 destID;
-		u32 signal;
-		std::vector<u8> data;
+		u32 senderID; // ID of the parameter sender
+		u32 destID;   // ID of the app to receive parameter
+		u32 signal;   // Signal type (eg request)
+		u32 object;   // Some applets will also respond with shared memory handles for transferring data between the sender and called
+		std::vector<u8> data; // Misc data
 	};
 
 	class AppletBase {

include/kernel/handles.hpp

@@ -53,6 +53,7 @@ namespace KernelHandles {
 		GSPSharedMemHandle = MaxServiceHandle + 1, // Handle for the GSP shared memory
 		FontSharedMemHandle,
 		CSNDSharedMemHandle,
+		APTCaptureSharedMemHandle, // Shared memory for display capture info,  
 		HIDSharedMemHandle,
 
 		MinSharedMemHandle = GSPSharedMemHandle,

include/memory.hpp

@@ -112,11 +112,12 @@ class Memory {
 	// This tracks our OS' memory allocations
 	std::vector<KernelMemoryTypes::MemoryInfo> memoryInfo;
 
-	std::array<SharedMemoryBlock, 4> sharedMemBlocks = {
+	std::array<SharedMemoryBlock, 5> sharedMemBlocks = {
 		SharedMemoryBlock(0, 0, KernelHandles::FontSharedMemHandle), // Shared memory for the system font (size is 0 because we read the size from the cmrc filesystem
 		SharedMemoryBlock(0, 0x1000, KernelHandles::GSPSharedMemHandle), // GSP shared memory
 		SharedMemoryBlock(0, 0x1000, KernelHandles::HIDSharedMemHandle),  // HID shared memory
 		SharedMemoryBlock(0, 0x3000, KernelHandles::CSNDSharedMemHandle), // CSND shared memory
+		SharedMemoryBlock(0, 0xE7000, KernelHandles::APTCaptureSharedMemHandle),  // APT Capture Buffer memory
  	};
 
 public:

include/services/gsp_gpu.hpp

@@ -60,6 +60,15 @@ class GPUService {
 	};
 	static_assert(sizeof(FramebufferUpdate) == 64, "GSP::GPU::FramebufferUpdate has the wrong size");
 
+	// Used for saving and restoring GPU state via ImportDisplayCaptureInfo
+	struct CaptureInfo {
+		u32 leftFramebuffer; // Left framebuffer VA
+		u32 rightFramebuffer; // Right framebuffer VA (Top screen only)
+		u32 format;
+		u32 stride;
+	};
+	static_assert(sizeof(CaptureInfo) == 16, "GSP::GPU::CaptureInfo has the wrong size");
+
 	// Service commands
 	void acquireRight(u32 messagePointer);
 	void flushDataCache(u32 messagePointer);
@@ -86,6 +95,15 @@ class GPUService {
 
 	void setBufferSwapImpl(u32 screen_id, const FramebufferInfo& info);
 
+	// Get the framebuffer info in shared memory for a given screen
+	FramebufferUpdate* getFramebufferInfo(int screen) {
+		// TODO: Offset depends on GSP thread being triggered
+		return reinterpret_cast<FramebufferUpdate*>(&sharedMem[0x200 + screen * sizeof(FramebufferUpdate)]);
+	}
+
+	FramebufferUpdate* getTopFramebufferInfo() { return getFramebufferInfo(0); }
+	FramebufferUpdate* getBottomFramebufferInfo() { return getFramebufferInfo(1); }
+
 public:
 	GPUService(Memory& mem, GPU& gpu, Kernel& kernel, u32& currentPID) : mem(mem), gpu(gpu),
 		kernel(kernel), currentPID(currentPID) {}