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https://github.com/citra-mirror/citra.git
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GSP: Implements preliminary command synchronization via GPU interrupts.
Core: Added a comment to explain the logic for the RunLoop iterations.
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@ -26,21 +26,25 @@ ARM_Interface* g_sys_core = nullptr; ///< ARM11 system (OS) core
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/// Run the core CPU loop
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void RunLoop() {
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for (;;){
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g_app_core->Run(GPU::kFrameTicks);
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// This function loops for 100 instructions in the CPU before trying to update hardware.
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// This is a little bit faster than SingleStep, and should be pretty much equivalent. The
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// number of instructions chosen is fairly arbitrary, however a large number will more
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// drastically affect the frequency of GSP interrupts and likely break things. The point of
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// this is to just loop in the CPU for more than 1 instruction to reduce overhead and make
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// it a little bit faster...
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g_app_core->Run(100);
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HW::Update();
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Kernel::Reschedule();
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if (HLE::g_reschedule) {
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Kernel::Reschedule();
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}
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}
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}
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/// Step the CPU one instruction
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void SingleStep() {
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g_app_core->Step();
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// Update and reschedule after approx. 1 frame
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u64 current_ticks = Core::g_app_core->GetTicks();
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if ((current_ticks - g_last_ticks) >= GPU::kFrameTicks || HLE::g_reschedule) {
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g_last_ticks = current_ticks;
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HW::Update();
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HW::Update();
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if (HLE::g_reschedule) {
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Kernel::Reschedule();
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}
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}
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@ -21,6 +21,27 @@
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// Main graphics debugger object - TODO: Here is probably not the best place for this
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GraphicsDebugger g_debugger;
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/// GSP thread interrupt queue header
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struct GX_InterruptQueue {
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union {
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u32 hex;
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// Index of last interrupt in the queue
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BitField<0,8,u32> index;
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// Number of interrupts remaining to be processed by the userland code
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BitField<8,8,u32> number_interrupts;
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// Error code - zero on success, otherwise an error has occurred
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BitField<16,8,u32> error_code;
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};
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u32 unk0;
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u32 unk1;
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GSP_GPU::GXInterruptId slot[0x34]; ///< Interrupt ID slots
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};
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/// GSP shared memory GX command buffer header
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union GX_CmdBufferHeader {
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u32 hex;
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@ -45,20 +66,28 @@ namespace GSP_GPU {
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Handle g_event = 0;
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Handle g_shared_memory = 0;
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u32 g_thread_id = 0;
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u32 g_thread_id = 1;
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/// Gets a pointer to the start (header) of a command buffer in GSP shared memory
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static inline u8* GX_GetCmdBufferPointer(u32 thread_id, u32 offset=0) {
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if (0 == g_shared_memory) return nullptr;
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return Kernel::GetSharedMemoryPointer(g_shared_memory, 0x800 + (thread_id * 0x200) + offset);
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}
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/// Gets a pointer to the start (header) of a command buffer in GSP shared memory
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static inline GX_InterruptQueue* GetInterruptQueue(u32 thread_id) {
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return (GX_InterruptQueue*)Kernel::GetSharedMemoryPointer(g_shared_memory, sizeof(GX_InterruptQueue) * thread_id);
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}
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/// Finishes execution of a GSP command
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void GX_FinishCommand(u32 thread_id) {
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GX_CmdBufferHeader* header = (GX_CmdBufferHeader*)GX_GetCmdBufferPointer(thread_id);
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g_debugger.GXCommandProcessed(GX_GetCmdBufferPointer(thread_id, 0x20 + (header->index * 0x20)));
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header->number_commands = header->number_commands - 1;
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header->number_commands = 0;
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// TODO: Increment header->index?
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}
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@ -134,33 +163,55 @@ void RegisterInterruptRelayQueue(Service::Interface* self) {
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u32* cmd_buff = Service::GetCommandBuffer();
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u32 flags = cmd_buff[1];
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g_event = cmd_buff[3];
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g_shared_memory = Kernel::CreateSharedMemory("GSPSharedMem");
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_assert_msg_(GSP, (g_event != 0), "handle is not valid!");
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Kernel::SetEventLocked(g_event, false);
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cmd_buff[2] = g_thread_id++; // ThreadID
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cmd_buff[4] = g_shared_memory; // GSP shared memory
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// Hack - This function will permanently set the state of the GSP event such that GPU command
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// synchronization barriers always passthrough. Correct solution would be to set this after the
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// GPU as processed all queued up commands, but due to the emulator being single-threaded they
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// will always be ready.
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Kernel::SetPermanentLock(g_event, true);
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cmd_buff[0] = 0; // Result - no error
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cmd_buff[2] = g_thread_id; // ThreadID
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cmd_buff[4] = g_shared_memory; // GSP shared memory
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Kernel::SignalEvent(GSP_GPU::g_event); // TODO(bunnei): Is this correct?
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}
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/**
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* Signals that the specified interrupt type has occurred to userland code
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* @param interrupt_id ID of interrupt that is being signalled
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*/
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void SignalInterrupt(GXInterruptId interrupt_id) {
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if (0 == GSP_GPU::g_event) {
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WARN_LOG(GSP, "cannot synchronize until GSP event has been created!");
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return;
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}
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if (0 == g_shared_memory) {
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WARN_LOG(GSP, "cannot synchronize until GSP shared memory has been created!");
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return;
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}
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for (int thread_id = 0; thread_id < 0x4; ++thread_id) {
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GX_InterruptQueue* interrupt_queue = GetInterruptQueue(thread_id);
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interrupt_queue->number_interrupts = interrupt_queue->number_interrupts + 1;
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u8 next = interrupt_queue->index;
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next += interrupt_queue->number_interrupts;
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next = next % 0x34;
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/// This triggers handling of the GX command written to the command buffer in shared memory.
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void TriggerCmdReqQueue(Service::Interface* self) {
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interrupt_queue->slot[next] = interrupt_id;
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interrupt_queue->error_code = 0x0; // No error
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}
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Kernel::SignalEvent(GSP_GPU::g_event);
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}
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/// Executes the next GSP command
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void ExecuteCommand(int thread_id, int command_index) {
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// Utility function to convert register ID to address
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auto WriteGPURegister = [](u32 id, u32 data) {
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GPU::Write<u32>(0x1EF00000 + 4 * id, data);
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};
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GX_CmdBufferHeader* header = (GX_CmdBufferHeader*)GX_GetCmdBufferPointer(g_thread_id);
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auto& command = *(const GXCommand*)GX_GetCmdBufferPointer(g_thread_id, 0x20 + (header->index * 0x20));
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GX_CmdBufferHeader* header = (GX_CmdBufferHeader*)GX_GetCmdBufferPointer(thread_id);
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auto& command = *(const GXCommand*)GX_GetCmdBufferPointer(thread_id, (command_index + 1) * 0x20);
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NOTICE_LOG(GSP, "decoding command 0x%08X", (int)command.id.Value());
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switch (command.id) {
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@ -186,6 +237,7 @@ void TriggerCmdReqQueue(Service::Interface* self) {
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g_debugger.CommandListCalled(params.address,
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(u32*)Memory::GetPointer(params.address),
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params.size);
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SignalInterrupt(GXInterruptId::P3D);
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break;
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}
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@ -208,6 +260,16 @@ void TriggerCmdReqQueue(Service::Interface* self) {
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// TODO: Check if texture copies are implemented correctly..
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case GXCommandId::SET_DISPLAY_TRANSFER:
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// TODO(bunnei): Signalling all of these interrupts here is totally wrong, but it seems to
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// work well enough for running demos. Need to figure out how these all work and trigger
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// them correctly.
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SignalInterrupt(GXInterruptId::PSC0);
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SignalInterrupt(GXInterruptId::PSC1);
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SignalInterrupt(GXInterruptId::PPF);
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SignalInterrupt(GXInterruptId::P3D);
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SignalInterrupt(GXInterruptId::DMA);
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break;
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case GXCommandId::SET_TEXTURE_COPY:
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{
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auto& params = command.image_copy;
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@ -233,8 +295,21 @@ void TriggerCmdReqQueue(Service::Interface* self) {
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default:
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ERROR_LOG(GSP, "unknown command 0x%08X", (int)command.id.Value());
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}
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}
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GX_FinishCommand(g_thread_id);
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/// This triggers handling of the GX command written to the command buffer in shared memory.
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void TriggerCmdReqQueue(Service::Interface* self) {
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// Iterate through each thread's command queue...
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for (int thread_id = 0; thread_id < 0x4; ++thread_id) {
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GX_CmdBufferHeader* header = (GX_CmdBufferHeader*)GX_GetCmdBufferPointer(thread_id);
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// Iterate through each command...
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for (int command_index = 0; command_index < header->number_commands; ++command_index) {
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ExecuteCommand(thread_id, command_index);
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}
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GX_FinishCommand(thread_id);
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}
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}
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const Interface::FunctionInfo FunctionTable[] = {
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@ -275,7 +350,7 @@ const Interface::FunctionInfo FunctionTable[] = {
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Interface::Interface() {
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Register(FunctionTable, ARRAY_SIZE(FunctionTable));
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g_shared_memory = Kernel::CreateSharedMemory("GSPSharedMem");
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g_shared_memory = 0;
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}
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Interface::~Interface() {
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@ -29,6 +29,16 @@ enum class GXCommandId : u32 {
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SET_COMMAND_LIST_FIRST = 0x05,
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};
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enum class GXInterruptId : u8 {
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PSC0 = 0x00,
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PSC1 = 0x01,
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PDC0 = 0x02, // Seems called every vertical screen line
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PDC1 = 0x03, // Seems called every frame
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PPF = 0x04,
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P3D = 0x05,
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DMA = 0x06,
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};
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struct GXCommand {
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BitField<0, 8, GXCommandId> id;
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@ -84,4 +94,10 @@ public:
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};
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/**
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* Signals that the specified interrupt type has occurred to userland code
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* @param interrupt_id ID of interrupt that is being signalled
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*/
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void SignalInterrupt(GXInterruptId interrupt_id);
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} // namespace
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@ -7,7 +7,11 @@
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#include "core/core.h"
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#include "core/mem_map.h"
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#include "core/hle/hle.h"
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#include "core/hle/kernel/thread.h"
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#include "core/hle/service/gsp.h"
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#include "core/hw/gpu.h"
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#include "video_core/video_core.h"
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@ -17,7 +21,8 @@ namespace GPU {
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RegisterSet<u32, Regs> g_regs;
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u64 g_last_ticks = 0; ///< Last CPU ticks
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u32 g_cur_line = 0; ///< Current vertical screen line
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u64 g_last_ticks = 0; ///< Last CPU ticks
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/**
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* Sets whether the framebuffers are in the GSP heap (FCRAM) or VRAM
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@ -249,17 +254,28 @@ template void Write<u8>(u32 addr, const u8 data);
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void Update() {
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u64 current_ticks = Core::g_app_core->GetTicks();
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// Fake a vertical blank
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if ((current_ticks - g_last_ticks) >= kFrameTicks) {
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// Synchronize line...
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if ((current_ticks - g_last_ticks) >= GPU::kFrameTicks / 400) {
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GSP_GPU::SignalInterrupt(GSP_GPU::GXInterruptId::PDC0);
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g_cur_line++;
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g_last_ticks = current_ticks;
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}
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// Synchronize frame...
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if (g_cur_line >= 400) {
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g_cur_line = 0;
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GSP_GPU::SignalInterrupt(GSP_GPU::GXInterruptId::PDC1);
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VideoCore::g_renderer->SwapBuffers();
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Kernel::WaitCurrentThread(WAITTYPE_VBLANK);
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HLE::Reschedule(__func__);
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}
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}
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/// Initialize hardware
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void Init() {
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g_cur_line = 0;
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g_last_ticks = Core::g_app_core->GetTicks();
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// SetFramebufferLocation(FRAMEBUFFER_LOCATION_FCRAM);
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SetFramebufferLocation(FRAMEBUFFER_LOCATION_VRAM);
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