Add Renderer::deinitGraphicsContext

include/PICA/gpu.hpp

@@ -88,6 +88,7 @@ class GPU {
 	GPU(Memory& mem, EmulatorConfig& config);
 	void display() { renderer->display(); }
 	void screenshot(const std::string& name) { renderer->screenshot(name); }
+	void deinitGraphicsContext() { renderer->deinitGraphicsContext(); }
 
 #if defined(PANDA3DS_FRONTEND_SDL)
 	void initGraphicsContext(SDL_Window* window) { renderer->initGraphicsContext(window); }

include/emulator.hpp

@@ -112,6 +112,7 @@ class Emulator {
 
 	RomFS::DumpingResult dumpRomFS(const std::filesystem::path& path);
 	void setOutputSize(u32 width, u32 height) { gpu.setOutputSize(width, height); }
+	void deinitGraphicsContext() { gpu.deinitGraphicsContext(); }
 
 	EmulatorConfig& getConfig() { return config; }
 	ServiceManager& getServiceManager() { return kernel.getServiceManager(); }

include/renderer.hpp

@@ -62,6 +62,9 @@ class Renderer {
 	virtual void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) = 0;  // Draw the given vertices
 
 	virtual void screenshot(const std::string& name) = 0;
+	// Some frontends and platforms may require that we delete our GL or misc context and obtain a new one for things like exclusive fullscreen
+	// This function does things like write back or cache necessary state before we delete our context
+	virtual void deinitGraphicsContext() = 0;
 
 	// Functions for initializing the graphics context for the Qt frontend, where we don't have the convenience of SDL_Window
 #ifdef PANDA3DS_FRONTEND_QT

include/renderer_gl/renderer_gl.hpp

@@ -81,6 +81,7 @@ class RendererGL final : public Renderer {
 	void displayTransfer(u32 inputAddr, u32 outputAddr, u32 inputSize, u32 outputSize, u32 flags) override;  // Perform display transfer
 	void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) override;
 	void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) override;             // Draw the given vertices
+	void deinitGraphicsContext() override;
 	
 	std::optional<ColourBuffer> getColourBuffer(u32 addr, PICA::ColorFmt format, u32 width, u32 height, bool createIfnotFound = true);
 

include/renderer_null/renderer_null.hpp

@@ -15,6 +15,7 @@ class RendererNull final : public Renderer {
 	void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) override;
 	void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) override;
 	void screenshot(const std::string& name) override;
+	void deinitGraphicsContext() override;
 
 #ifdef PANDA3DS_FRONTEND_QT
 	virtual void initGraphicsContext([[maybe_unused]] GL::Context* context) override {}

include/renderer_sw/renderer_sw.hpp

@@ -15,6 +15,7 @@ class RendererSw final : public Renderer {
 	void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) override;
 	void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) override;
 	void screenshot(const std::string& name) override;
+	void deinitGraphicsContext() override;
 
 #ifdef PANDA3DS_FRONTEND_QT
 	virtual void initGraphicsContext([[maybe_unused]] GL::Context* context) override {}

include/renderer_vk/renderer_vk.hpp

@@ -119,4 +119,5 @@ class RendererVK final : public Renderer {
 	void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) override;
 	void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) override;
 	void screenshot(const std::string& name) override;
+	void deinitGraphicsContext() override;
 };

src/core/renderer_gl/renderer_gl.cpp

@@ -802,3 +802,14 @@ void RendererGL::screenshot(const std::string& name) {
 
 	stbi_write_png(name.c_str(), width, height, 4, flippedPixels.data(), 0);
 }
+
+void RendererGL::deinitGraphicsContext() {
+	// Invalidate all surface caches since they'll no longer be valid
+	textureCache.reset();
+	depthBufferCache.reset();
+	colourBufferCache.reset();
+
+	// All other GL objects should be invalidated automatically and be recreated by the next call to initGraphicsContext
+	// TODO: Make it so that depth and colour buffers get written back to 3DS memory
+	printf("RendererGL::DeinitGraphicsContext called\n");
+}

src/core/renderer_null/renderer_null.cpp

@@ -12,3 +12,4 @@ void RendererNull::displayTransfer(u32 inputAddr, u32 outputAddr, u32 inputSize,
 void RendererNull::textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) {}
 void RendererNull::drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) {}
 void RendererNull::screenshot(const std::string& name) {}
+void RendererNull::deinitGraphicsContext() {}

src/core/renderer_sw/renderer_sw.cpp

@@ -23,3 +23,4 @@ void RendererSw::drawVertices(PICA::PrimType primType, std::span<const PICA::Ver
 }
 
 void RendererSw::screenshot(const std::string& name) { printf("RendererSW: Unimplemented screenshot call\n"); }
+void RendererSw::deinitGraphicsContext() { printf("RendererSW: Unimplemented DeinitGraphicsContext call\n"); }

src/core/renderer_vk/renderer_vk.cpp

@@ -1581,3 +1581,11 @@ void RendererVK::drawVertices(PICA::PrimType primType, std::span<const PICA::Ver
 }
 
 void RendererVK::screenshot(const std::string& name) {}
+
+void RendererVK::deinitGraphicsContext() {
+	// Invalidate the entire texture cache since they'll no longer be valid
+	textureCache.clear();
+
+	// TODO: Make it so that depth and colour buffers get written back to 3DS memory
+	printf("RendererVK::DeinitGraphicsContext called\n");
+}