Merge pull request #120 from Wunkolo/renderer-null

Add a `null` rendering backend

src/core/PICA/gpu.cpp

@@ -7,7 +7,7 @@
 
 #include "PICA/float_types.hpp"
 #include "PICA/regs.hpp"
-
+#include "renderer_null/renderer_null.hpp"
 #ifdef PANDA3DS_ENABLE_OPENGL
 #include "renderer_gl/renderer_gl.hpp"
 #endif
@@ -20,10 +20,27 @@ GPU::GPU(Memory& mem, EmulatorConfig& config) : mem(mem), config(config) {
 	vram = new u8[vramSize];
 	mem.setVRAM(vram);  // Give the bus a pointer to our VRAM
 
-	// TODO: Configurable backend
+	switch (config.rendererType) {
+		case RendererType::Null: {
+			renderer.reset(new RendererNull(*this, regs));
+			break;
+		}
 #ifdef PANDA3DS_ENABLE_OPENGL
-	renderer.reset(new RendererGL(*this, regs));
+		case RendererType::OpenGL: {
+			renderer.reset(new RendererGL(*this, regs));
+			break;
+		}
 #endif
+
+		case RendererType::Vulkan: {
+			Helpers::panic("Vulkan is not supported yet, please pick another renderer");
+		}
+
+		default: {
+			Helpers::panic("Rendering backend not supported: %s", Renderer::typeToString(config.rendererType));
+			break;
+		}
+	}
 }
 
 void GPU::reset() {

src/core/renderer_gl/renderer_gl.cpp

@@ -14,6 +14,8 @@ using namespace Floats;
 using namespace Helpers;
 using namespace PICA;
 
+RendererGL::~RendererGL() {}
+
 void RendererGL::reset() {
 	depthBufferCache.reset();
 	colourBufferCache.reset();

src/core/renderer_null/renderer_null.cpp

@@ -0,0 +1,12 @@
+#include "renderer_null/renderer_null.hpp"
+
+RendererNull::RendererNull(GPU& gpu, const std::array<u32, regNum>& internalRegs) : Renderer(gpu, internalRegs) {}
+RendererNull::~RendererNull() {}
+
+void RendererNull::reset() {}
+void RendererNull::display() {}
+void RendererNull::initGraphicsContext() {}
+void RendererNull::clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control) {}
+void RendererNull::displayTransfer(u32 inputAddr, u32 outputAddr, 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) {}