gpu: Report renderer errors with exceptions

Instead of using a two step initialization to report errors, initialize
the GPU renderer and rasterizer on the constructor and report errors
through std::runtime_error.

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -132,7 +132,20 @@ RendererOpenGL::RendererOpenGL(Core::TelemetrySession& telemetry_session_,
                                Core::Memory::Memory& cpu_memory_, Tegra::GPU& gpu_,
                                std::unique_ptr<Core::Frontend::GraphicsContext> context_)
     : RendererBase{emu_window_, std::move(context_)}, telemetry_session{telemetry_session_},
-      emu_window{emu_window_}, cpu_memory{cpu_memory_}, gpu{gpu_}, program_manager{device} {}
+      emu_window{emu_window_}, cpu_memory{cpu_memory_}, gpu{gpu_}, program_manager{device},
+      rasterizer{emu_window, gpu, cpu_memory, device, screen_info, program_manager, state_tracker} {
+    if (Settings::values.renderer_debug && GLAD_GL_KHR_debug) {
+        glEnable(GL_DEBUG_OUTPUT);
+        glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+        glDebugMessageCallback(DebugHandler, nullptr);
+    }
+    AddTelemetryFields();
+
+    if (!GLAD_GL_VERSION_4_6) {
+        throw std::runtime_error{"OpenGL 4.3 is not available"};
+    }
+    InitOpenGLObjects();
+}
 
 RendererOpenGL::~RendererOpenGL() = default;
 
@@ -148,7 +161,7 @@ void RendererOpenGL::SwapBuffers(const Tegra::FramebufferConfig* framebuffer) {
 
     ++m_current_frame;
 
-    rasterizer->TickFrame();
+    rasterizer.TickFrame();
 
     context->SwapBuffers();
     render_window.OnFrameDisplayed();
@@ -179,7 +192,7 @@ void RendererOpenGL::LoadFBToScreenInfo(const Tegra::FramebufferConfig& framebuf
     framebuffer_crop_rect = framebuffer.crop_rect;
 
     const VAddr framebuffer_addr{framebuffer.address + framebuffer.offset};
-    if (rasterizer->AccelerateDisplay(framebuffer, framebuffer_addr, framebuffer.stride)) {
+    if (rasterizer.AccelerateDisplay(framebuffer, framebuffer_addr, framebuffer.stride)) {
         return;
     }
 
@@ -289,14 +302,6 @@ void RendererOpenGL::AddTelemetryFields() {
     telemetry_session.AddField(user_system, "GPU_OpenGL_Version", std::string(gl_version));
 }
 
-void RendererOpenGL::CreateRasterizer() {
-    if (rasterizer) {
-        return;
-    }
-    rasterizer = std::make_unique<RasterizerOpenGL>(emu_window, gpu, cpu_memory, device,
-                                                    screen_info, program_manager, state_tracker);
-}
-
 void RendererOpenGL::ConfigureFramebufferTexture(TextureInfo& texture,
                                                  const Tegra::FramebufferConfig& framebuffer) {
     texture.width = framebuffer.width;
@@ -497,25 +502,4 @@ void RendererOpenGL::RenderScreenshot() {
     renderer_settings.screenshot_requested = false;
 }
 
-bool RendererOpenGL::Init() {
-    if (Settings::values.renderer_debug && GLAD_GL_KHR_debug) {
-        glEnable(GL_DEBUG_OUTPUT);
-        glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
-        glDebugMessageCallback(DebugHandler, nullptr);
-    }
-
-    AddTelemetryFields();
-
-    if (!GLAD_GL_VERSION_4_6) {
-        return false;
-    }
-
-    InitOpenGLObjects();
-    CreateRasterizer();
-
-    return true;
-}
-
-void RendererOpenGL::ShutDown() {}
-
 } // namespace OpenGL

src/video_core/renderer_opengl/renderer_opengl.h

@@ -10,6 +10,7 @@
 #include "common/math_util.h"
 #include "video_core/renderer_base.h"
 #include "video_core/renderer_opengl/gl_device.h"
+#include "video_core/renderer_opengl/gl_rasterizer.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 #include "video_core/renderer_opengl/gl_shader_manager.h"
 #include "video_core/renderer_opengl/gl_state_tracker.h"
@@ -63,18 +64,18 @@ public:
                             std::unique_ptr<Core::Frontend::GraphicsContext> context_);
     ~RendererOpenGL() override;
 
-    bool Init() override;
-    void ShutDown() override;
     void SwapBuffers(const Tegra::FramebufferConfig* framebuffer) override;
 
+    VideoCore::RasterizerInterface* ReadRasterizer() override {
+        return &rasterizer;
+    }
+
 private:
     /// Initializes the OpenGL state and creates persistent objects.
     void InitOpenGLObjects();
 
     void AddTelemetryFields();
 
-    void CreateRasterizer();
-
     void ConfigureFramebufferTexture(TextureInfo& texture,
                                      const Tegra::FramebufferConfig& framebuffer);
 
@@ -118,6 +119,8 @@ private:
     /// Global dummy shader pipeline
     ProgramManager program_manager;
 
+    RasterizerOpenGL rasterizer;
+
     /// OpenGL framebuffer data
     std::vector<u8> gl_framebuffer_data;