core: Fix accurate multiplication loading (home menu and savestate)

src/android/app/src/main/jni/native.cpp

@@ -269,6 +269,8 @@ static Core::System::ResultStatus RunCitra(const std::string& filepath) {
 
     LoadDiskCacheProgress(VideoCore::LoadCallbackStage::Prepare, 0, 0);
 
+    system.GPU().ApplyPerProgramSettings(program_id);
+
     std::unique_ptr<Frontend::GraphicsContext> cpu_context;
     system.GPU().Renderer().Rasterizer()->LoadDefaultDiskResources(stop_run,
                                                                    &LoadDiskCacheProgress);

src/citra_qt/bootmanager.cpp

@@ -18,6 +18,7 @@
 #include "core/3ds.h"
 #include "core/core.h"
 #include "core/frontend/framebuffer_layout.h"
+#include "core/loader/loader.h"
 #include "core/perf_stats.h"
 #include "input_common/keyboard.h"
 #include "input_common/main.h"
@@ -78,6 +79,10 @@ void EmuThread::run() {
 
     emit LoadProgress(VideoCore::LoadCallbackStage::Prepare, 0, 0);
 
+    u64 program_id{};
+    system.GetAppLoader().ReadProgramId(program_id);
+    system.GPU().ApplyPerProgramSettings(program_id);
+
     system.GPU().Renderer().Rasterizer()->LoadDefaultDiskResources(
         stop_run, [this](VideoCore::LoadCallbackStage stage, std::size_t value, std::size_t total) {
             emit LoadProgress(stage, value, total);

src/citra_sdl/citra_sdl.cpp

@@ -474,6 +474,10 @@ int LaunchSdlFrontend(int argc, char** argv) {
         }
     });
 
+    u64 program_id{};
+    system.GetAppLoader().ReadProgramId(program_id);
+    system.GPU().ApplyPerProgramSettings(program_id);
+
     std::atomic_bool stop_run;
     system.GPU().Renderer().Rasterizer()->LoadDefaultDiskResources(
         stop_run, [](VideoCore::LoadCallbackStage stage, std::size_t value, std::size_t total) {

src/core/core.cpp

@@ -403,8 +403,6 @@ System::ResultStatus System::Load(Frontend::EmuWindow& emu_window, const std::st
 
     kernel->UpdateCPUAndMemoryState(program_id, app_mem_mode, app_n3ds_hw_capabilities);
 
-    gpu->ReportLoadingProgramID(program_id);
-
     // Restore any parameters that should be carried through a reset.
     if (auto apt = Service::APT::GetModule(*this)) {
         if (restore_deliver_arg.has_value()) {
@@ -902,13 +900,15 @@ void System::serialize(Archive& ar, const unsigned int file_version) {
         gpu->SetInterruptHandler(
             [gsp](Service::GSP::InterruptId interrupt_id) { gsp->SignalInterrupt(interrupt_id); });
 
-        // Switch the shader cache to the title running when the savestate was created
+        // Apply per program settings and switch the shader cache to the title running when the
+        // savestate was created.
         const u32 thread_id = gsp->GetActiveClientThreadId();
         if (thread_id != std::numeric_limits<u32>::max()) {
             const auto thread = kernel->GetThreadByID(thread_id);
             if (thread) {
                 const std::shared_ptr<Kernel::Process> process = thread->owner_process.lock();
                 if (process) {
+                    gpu->ApplyPerProgramSettings(process->codeset->program_id);
                     gpu->Renderer().Rasterizer()->SwitchDiskResources(process->codeset->program_id);
                 }
             }

src/core/hle/service/gsp/gsp_gpu.cpp

@@ -693,6 +693,7 @@ Result GSP_GPU::AcquireGpuRight(const Kernel::HLERequestContext& ctx,
             Common::Hacks::HackAllowMode::DISALLOW) != Common::Hacks::HackAllowMode::DISALLOW;
 
     auto& gpu = system.GPU();
+    gpu.ApplyPerProgramSettings(process->codeset->program_id);
     gpu.GetRightEyeDisabler().SetEnabled(right_eye_disable_allow);
     gpu.PicaCore().vs_setup.requires_fixup = requires_shader_fixup;
     gpu.PicaCore().gs_setup.requires_fixup = requires_shader_fixup;

src/video_core/gpu.cpp

@@ -311,7 +311,7 @@ GraphicsDebugger& GPU::Debugger() {
     return impl->gpu_debugger;
 }
 
-void GPU::ReportLoadingProgramID(u64 program_ID) {
+void GPU::ApplyPerProgramSettings(u64 program_ID) {
     auto hack = Common::Hacks::hack_manager.GetHack(
         Common::Hacks::HackType::ACCURATE_MULTIPLICATION, program_ID);
     bool use_accurate_mul = Settings::values.shaders_accurate_mul.GetValue();

src/video_core/gpu.h

@@ -94,7 +94,7 @@ public:
         return *right_eye_disabler;
     }
 
-    void ReportLoadingProgramID(u64 program_ID);
+    void ApplyPerProgramSettings(u64 program_ID);
 
 private:
     void SubmitCmdList(u32 index);