Merge pull request #120 from Wunkolo/renderer-null

Add a `null` rendering backend

include/config.hpp

@@ -1,10 +1,14 @@
 #pragma once
 #include <filesystem>
 
+#include "renderer.hpp"
+
 // Remember to initialize every field here to its default value otherwise bad things will happen
 struct EmulatorConfig {
 	bool shaderJitEnabled = false;
+	RendererType rendererType = RendererType::OpenGL;
 
+	EmulatorConfig(const std::filesystem::path& path);
 	void load(const std::filesystem::path& path);
 	void save(const std::filesystem::path& path);
 };

include/emulator.hpp

@@ -25,13 +25,13 @@ enum class ROMType {
 };
 
 class Emulator {
+	EmulatorConfig config;
 	CPU cpu;
 	GPU gpu;
 	Memory memory;
 	Kernel kernel;
 	Crypto::AESEngine aesEngine;
 
-	EmulatorConfig config;
 	SDL_Window* window;
 
 #ifdef PANDA3DS_ENABLE_OPENGL
@@ -70,8 +70,8 @@ class Emulator {
   public:
 	// Decides whether to reload or not reload the ROM when resetting. We use enum class over a plain bool for clarity.
 	// If NoReload is selected, the emulator will not reload its selected ROM. This is useful for things like booting up the emulator, or resetting to
-	// change ROMs. If Reload is selected, the emulator will reload its selected ROM. This is useful for eg a "reset" button that keeps the current ROM
-	// and just resets the emu
+	// change ROMs. If Reload is selected, the emulator will reload its selected ROM. This is useful for eg a "reset" button that keeps the current
+	// ROM and just resets the emu
 	enum class ReloadOption { NoReload, Reload };
 
 	Emulator();

include/renderer.hpp

@@ -1,11 +1,19 @@
 #pragma once
 #include <array>
 #include <span>
+#include <optional>
 
 #include "PICA/pica_vertex.hpp"
 #include "PICA/regs.hpp"
 #include "helpers.hpp"
 
+enum class RendererType : s8 {
+	// Todo: Auto = -1,
+	Null = 0,
+	OpenGL = 1,
+	Vulkan = 2,
+};
+
 class GPU;
 
 class Renderer {
@@ -28,6 +36,8 @@ class Renderer {
 	virtual ~Renderer();
 
 	static constexpr u32 vertexBufferSize = 0x10000;
+	static std::optional<RendererType> typeFromString(std::string inString);
+	static const char* typeToString(RendererType rendererType);
 
 	virtual void reset() = 0;
 	virtual void display() = 0;                                                              // Display the 3DS screen contents to the window

include/renderer_gl/renderer_gl.hpp

@@ -68,6 +68,7 @@ class RendererGL final : public Renderer {
 
   public:
 	RendererGL(GPU& gpu, const std::array<u32, regNum>& internalRegs) : Renderer(gpu, internalRegs) {}
+	~RendererGL() override;
 
 	void reset() override;
 	void display() override;                                                              // Display the 3DS screen contents to the window

include/renderer_null/renderer_null.hpp

@@ -0,0 +1,17 @@
+#include "renderer.hpp"
+
+class GPU;
+
+class RendererNull final : public Renderer {
+  public:
+	RendererNull(GPU& gpu, const std::array<u32, regNum>& internalRegs);
+	~RendererNull() override;
+
+	void reset() override;
+	void display() override;
+	void initGraphicsContext() override;
+	void clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control) override;
+	void displayTransfer(u32 inputAddr, u32 outputAddr, 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;
+};