VideoBackends: Simplify initialization and deinitialization of resources

Approximately three or four times now, the issue of pointers being
in an inconsistent state been an issue in the video backend renderers
with regards to tripping up other developers.

Global (ugh) resources are put into a unique_ptr and will always have a
well-defined state of being - null or not null

Source/Core/Common/GL/GLInterface/GLInterface.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
+
 #include "Common/GL/GLInterfaceBase.h"
 
 #ifdef ANDROID
@@ -20,19 +22,19 @@
 #error Platform doesnt have a GLInterface
 #endif
 
-cInterfaceBase* HostGL_CreateGLInterface()
+std::unique_ptr<cInterfaceBase> HostGL_CreateGLInterface()
 {
 	#ifdef ANDROID
-		return new cInterfaceEGLAndroid;
+		return std::make_unique<cInterfaceEGLAndroid>();
 	#elif defined(__APPLE__)
-		return new cInterfaceAGL;
+		return std::make_unique<cInterfaceAGL>();
 	#elif defined(_WIN32)
-		return new cInterfaceWGL;
+		return std::make_unique<cInterfaceWGL>();
 	#elif defined(HAVE_X11) && HAVE_X11
 	#if defined(USE_EGL) && USE_EGL
-		return new cInterfaceEGLX11;
+		return std::make_unique<cInterfaceEGLX11>();
 	#else
-		return new cInterfaceGLX;
+		return std::make_unique<cInterfaceGLX>();
 	#endif
 	#else
 		return nullptr;

Source/Core/Common/GL/GLInterfaceBase.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 
 #include "Common/CommonTypes.h"
@@ -42,8 +43,8 @@ public:
 	virtual bool PeekMessages() { return false; }
 };
 
-extern cInterfaceBase *GLInterface;
+extern std::unique_ptr<cInterfaceBase> GLInterface;
 
 // This function has to be defined along the Host_ functions from Core/Host.h.
 // Current canonical implementation: DolphinWX/GLInterface/GLInterface.cpp.
-cInterfaceBase* HostGL_CreateGLInterface();
+std::unique_ptr<cInterfaceBase> HostGL_CreateGLInterface();

Source/Core/Common/GL/GLUtil.cpp

@@ -2,12 +2,14 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
+
 #include "Common/Assert.h"
 #include "Common/GL/GLInterfaceBase.h"
 #include "Common/GL/GLUtil.h"
 #include "Common/Logging/Log.h"
 
-cInterfaceBase *GLInterface;
+std::unique_ptr<cInterfaceBase> GLInterface;
 static GLuint attributelessVAO = 0;
 static GLuint attributelessVBO = 0;
 

Source/Core/VideoBackends/D3D/TextureCache.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
+
 #include "VideoBackends/D3D/D3DBase.h"
 #include "VideoBackends/D3D/D3DShader.h"
 #include "VideoBackends/D3D/D3DState.h"
@@ -21,7 +23,7 @@
 namespace DX11
 {
 
-static TextureEncoder* g_encoder = nullptr;
+static std::unique_ptr<TextureEncoder> g_encoder;
 const size_t MAX_COPY_BUFFERS = 32;
 ID3D11Buffer* efbcopycbuf[MAX_COPY_BUFFERS] = { 0 };
 
@@ -377,7 +379,7 @@ ID3D11PixelShader *GetConvertShader(const char* Type)
 TextureCache::TextureCache()
 {
 	// FIXME: Is it safe here?
-	g_encoder = new PSTextureEncoder;
+	g_encoder = std::make_unique<PSTextureEncoder>();
 	g_encoder->Init();
 
 	palette_buf = nullptr;
@@ -407,8 +409,7 @@ TextureCache::~TextureCache()
 		SAFE_RELEASE(efbcopycbuf[k]);
 
 	g_encoder->Shutdown();
-	delete g_encoder;
-	g_encoder = nullptr;
+	g_encoder.reset();
 
 	SAFE_RELEASE(palette_buf);
 	SAFE_RELEASE(palette_buf_srv);

Source/Core/VideoBackends/D3D/VertexManager.cpp

@@ -129,11 +129,11 @@ void VertexManager::Draw(u32 stride)
 	{
 		case PRIMITIVE_POINTS:
 			D3D::stateman->SetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_POINTLIST);
-			((DX11::Renderer*)g_renderer)->ApplyCullDisable();
+			static_cast<Renderer*>(g_renderer.get())->ApplyCullDisable();
 			break;
 		case PRIMITIVE_LINES:
 			D3D::stateman->SetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_LINELIST);
-			((DX11::Renderer*)g_renderer)->ApplyCullDisable();
+			static_cast<Renderer*>(g_renderer.get())->ApplyCullDisable();
 			break;
 		case PRIMITIVE_TRIANGLES:
 			D3D::stateman->SetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
@@ -146,7 +146,7 @@ void VertexManager::Draw(u32 stride)
 	INCSTAT(stats.thisFrame.numDrawCalls);
 
 	if (current_primitive_type != PRIMITIVE_TRIANGLES)
-		((DX11::Renderer*)g_renderer)->RestoreCull();
+		static_cast<Renderer*>(g_renderer.get())->RestoreCull();
 }
 
 void VertexManager::vFlush(bool useDstAlpha)

Source/Core/VideoBackends/D3D/main.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
 #include <string>
 
 #include "Common/FileUtil.h"
@@ -176,10 +177,10 @@ bool VideoBackend::Initialize(void *window_handle)
 void VideoBackend::Video_Prepare()
 {
 	// internal interfaces
-	g_renderer = new Renderer(m_window_handle);
-	g_texture_cache = new TextureCache;
-	g_vertex_manager = new VertexManager;
-	g_perf_query = new PerfQuery;
+	g_renderer = std::make_unique<Renderer>(m_window_handle);
+	g_texture_cache = std::make_unique<TextureCache>();
+	g_vertex_manager = std::make_unique<VertexManager>();
+	g_perf_query = std::make_unique<PerfQuery>();
 	VertexShaderCache::Init();
 	PixelShaderCache::Init();
 	GeometryShaderCache::Init();
@@ -225,14 +226,10 @@ void VideoBackend::Shutdown()
 		GeometryShaderCache::Shutdown();
 		BBox::Shutdown();
 
-		delete g_perf_query;
-		delete g_vertex_manager;
-		delete g_texture_cache;
-		delete g_renderer;
-		g_renderer = nullptr;
-		g_texture_cache = nullptr;
-		g_vertex_manager = nullptr;
-		g_perf_query = nullptr;
+		g_perf_query.reset();
+		g_vertex_manager.reset();
+		g_texture_cache.reset();
+		g_renderer.reset();
 	}
 }
 

Source/Core/VideoBackends/OGL/NativeVertexFormat.cpp

@@ -55,7 +55,7 @@ GLVertexFormat::GLVertexFormat(const PortableVertexDeclaration& _vtx_decl)
 	if (vertex_stride & 3)
 		PanicAlert("Uneven vertex stride: %i", vertex_stride);
 
-	VertexManager *vm = (OGL::VertexManager*)g_vertex_manager;
+	VertexManager* const vm = static_cast<VertexManager*>(g_vertex_manager.get());
 
 	glGenVertexArrays(1, &VAO);
 	glBindVertexArray(VAO);

Source/Core/VideoBackends/OGL/PerfQuery.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
+
 #include "Common/GL/GLInterfaceBase.h"
 #include "Common/GL/GLUtil.h"
 
@@ -10,15 +12,16 @@
 
 namespace OGL
 {
-PerfQueryBase* GetPerfQuery()
+std::unique_ptr<PerfQueryBase> GetPerfQuery()
 {
 	if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGLES3 &&
 	    GLExtensions::Supports("GL_NV_occlusion_query_samples"))
-		return new PerfQueryGLESNV();
-	else if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGLES3)
-		return new PerfQueryGL(GL_ANY_SAMPLES_PASSED);
-	else
-		return new PerfQueryGL(GL_SAMPLES_PASSED);
+		return std::make_unique<PerfQueryGLESNV>();
+
+	if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGLES3)
+		return std::make_unique<PerfQueryGL>(GL_ANY_SAMPLES_PASSED);
+
+	return std::make_unique<PerfQueryGL>(GL_SAMPLES_PASSED);
 }
 
 PerfQuery::PerfQuery()

Source/Core/VideoBackends/OGL/PerfQuery.h

@@ -13,7 +13,7 @@
 
 namespace OGL
 {
-PerfQueryBase* GetPerfQuery();
+std::unique_ptr<PerfQueryBase> GetPerfQuery();
 
 class PerfQuery : public PerfQueryBase
 {

Source/Core/VideoBackends/OGL/Render.cpp

@@ -1599,7 +1599,7 @@ void Renderer::RestoreAPIState()
 	SetLogicOpMode();
 	SetViewport();
 
-	VertexManager *vm = (OGL::VertexManager*)g_vertex_manager;
+	const VertexManager* const vm = static_cast<VertexManager*>(g_vertex_manager.get());
 	glBindBuffer(GL_ARRAY_BUFFER, vm->m_vertex_buffers);
 	if (vm->m_last_vao)
 		glBindVertexArray(vm->m_last_vao);

Source/Core/VideoBackends/OGL/SamplerCache.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
+
 #include "Common/GL/GLInterfaceBase.h"
 #include "VideoBackends/OGL/SamplerCache.h"
 #include "VideoCommon/DriverDetails.h"
@@ -10,7 +12,7 @@
 namespace OGL
 {
 
-SamplerCache *g_sampler_cache;
+std::unique_ptr<SamplerCache> g_sampler_cache;
 
 SamplerCache::SamplerCache()
 	: m_last_max_anisotropy()

Source/Core/VideoBackends/OGL/SamplerCache.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <map>
+#include <memory>
 
 #include "Common/CommonTypes.h"
 #include "Common/NonCopyable.h"
@@ -80,6 +81,6 @@ private:
 	u32 m_sampler_id[2];
 };
 
-extern SamplerCache *g_sampler_cache;
+extern std::unique_ptr<SamplerCache> g_sampler_cache;
 
 }

Source/Core/VideoBackends/OGL/TextureCache.h

@@ -19,6 +19,8 @@ class TextureCache : public TextureCacheBase
 {
 public:
 	TextureCache();
+	~TextureCache();
+
 	static void DisableStage(unsigned int stage);
 	static void SetStage();
 
@@ -49,8 +51,6 @@ private:
 		bool Save(const std::string& filename, unsigned int level) override;
 	};
 
-	~TextureCache();
-
 	TCacheEntryBase* CreateTexture(const TCacheEntryConfig& config) override;
 	void ConvertTexture(TCacheEntryBase* entry, TCacheEntryBase* unconverted, void* palette, TlutFormat format) override;
 

Source/Core/VideoBackends/OGL/VertexManager.cpp

@@ -137,7 +137,7 @@ void VertexManager::Draw(u32 stride)
 	INCSTAT(stats.thisFrame.numDrawCalls);
 
 	if (current_primitive_type != PRIMITIVE_TRIANGLES)
-		((OGL::Renderer*)g_renderer)->SetGenerationMode();
+		static_cast<Renderer*>(g_renderer.get())->SetGenerationMode();
 }
 
 void VertexManager::vFlush(bool useDstAlpha)

Source/Core/VideoBackends/OGL/main.cpp

@@ -38,6 +38,7 @@ Make AA apply instantly during gameplay if possible
 
 #include <algorithm>
 #include <cstdarg>
+#include <memory>
 
 #include "Common/Atomic.h"
 #include "Common/CommonPaths.h"
@@ -182,13 +183,13 @@ void VideoBackend::Video_Prepare()
 {
 	GLInterface->MakeCurrent();
 
-	g_renderer = new Renderer;
+	g_renderer = std::make_unique<Renderer>();
 
 	CommandProcessor::Init();
 	PixelEngine::Init();
 
 	BPInit();
-	g_vertex_manager = new VertexManager;
+	g_vertex_manager = std::make_unique<VertexManager>();
 	g_perf_query = GetPerfQuery();
 	Fifo_Init(); // must be done before OpcodeDecoder_Init()
 	OpcodeDecoder_Init();
@@ -197,8 +198,8 @@ void VideoBackend::Video_Prepare()
 	PixelShaderManager::Init();
 	GeometryShaderManager::Init();
 	ProgramShaderCache::Init();
-	g_texture_cache = new TextureCache();
-	g_sampler_cache = new SamplerCache();
+	g_texture_cache = std::make_unique<TextureCache>();
+	g_sampler_cache = std::make_unique<SamplerCache>();
 	Renderer::Init();
 	VertexLoaderManager::Init();
 	TextureConverter::Init();
@@ -216,39 +217,35 @@ void VideoBackend::Shutdown()
 	OSD::DoCallbacks(OSD::OSD_SHUTDOWN);
 
 	GLInterface->Shutdown();
-	delete GLInterface;
-	GLInterface = nullptr;
+	GLInterface.reset();
 }
 
 void VideoBackend::Video_Cleanup()
 {
-	if (g_renderer)
-	{
-		Fifo_Shutdown();
+	if (!g_renderer)
+		return;
 
-		// The following calls are NOT Thread Safe
-		// And need to be called from the video thread
-		Renderer::Shutdown();
-		BoundingBox::Shutdown();
-		TextureConverter::Shutdown();
-		VertexLoaderManager::Shutdown();
-		delete g_sampler_cache;
-		g_sampler_cache = nullptr;
-		delete g_texture_cache;
-		g_texture_cache = nullptr;
-		ProgramShaderCache::Shutdown();
-		VertexShaderManager::Shutdown();
-		PixelShaderManager::Shutdown();
-		GeometryShaderManager::Shutdown();
-		delete g_perf_query;
-		g_perf_query = nullptr;
-		delete g_vertex_manager;
-		g_vertex_manager = nullptr;
-		OpcodeDecoder_Shutdown();
-		delete g_renderer;
-		g_renderer = nullptr;
-		GLInterface->ClearCurrent();
-	}
+	Fifo_Shutdown();
+
+	// The following calls are NOT Thread Safe
+	// And need to be called from the video thread
+	Renderer::Shutdown();
+	BoundingBox::Shutdown();
+	TextureConverter::Shutdown();
+	VertexLoaderManager::Shutdown();
+	g_sampler_cache.reset();
+	g_texture_cache.reset();
+	ProgramShaderCache::Shutdown();
+	VertexShaderManager::Shutdown();
+	PixelShaderManager::Shutdown();
+	GeometryShaderManager::Shutdown();
+
+	g_perf_query.reset();
+	g_vertex_manager.reset();
+
+	OpcodeDecoder_Shutdown();
+	g_renderer.reset();
+	GLInterface->ClearCurrent();
 }
 
 }

Source/Core/VideoBackends/Software/SWOGLWindow.cpp

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
+
 #include "Common/GL/GLInterfaceBase.h"
 #include "Common/GL/GLUtil.h"
 #include "Common/Logging/Log.h"
@@ -25,10 +27,9 @@ void SWOGLWindow::Init(void *window_handle)
 void SWOGLWindow::Shutdown()
 {
 	GLInterface->Shutdown();
-	delete GLInterface;
-	GLInterface = nullptr;
+	GLInterface.reset();
 
-	SWOGLWindow::s_instance.release();
+	s_instance.reset();
 }
 
 void SWOGLWindow::Prepare()

Source/Core/VideoCommon/PerfQueryBase.cpp

@@ -2,10 +2,11 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <memory>
 #include "VideoCommon/PerfQueryBase.h"
 #include "VideoCommon/VideoConfig.h"
 
-PerfQueryBase* g_perf_query = nullptr;
+std::unique_ptr<PerfQueryBase> g_perf_query;
 
 bool PerfQueryBase::ShouldEmulate()
 {

Source/Core/VideoCommon/PerfQueryBase.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <memory>
 #include "Common/CommonTypes.h"
 
 enum PerfQueryType
@@ -65,4 +66,4 @@ protected:
 	volatile u32 m_results[PQG_NUM_MEMBERS];
 };
 
-extern PerfQueryBase* g_perf_query;
+extern std::unique_ptr<PerfQueryBase> g_perf_query;

Source/Core/VideoCommon/RenderBase.cpp

@@ -14,6 +14,7 @@
 
 #include <cinttypes>
 #include <cmath>
+#include <memory>
 #include <string>
 
 #include "Common/Atomic.h"
@@ -51,7 +52,7 @@ int frameCount;
 int OSDChoice;
 static int OSDTime;
 
-Renderer *g_renderer = nullptr;
+std::unique_ptr<Renderer> g_renderer;
 
 std::mutex Renderer::s_criticalScreenshot;
 std::string Renderer::s_sScreenshotName;

Source/Core/VideoCommon/RenderBase.h

@@ -14,6 +14,7 @@
 
 #pragma once
 
+#include <memory>
 #include <mutex>
 #include <string>
 
@@ -182,5 +183,5 @@ private:
 	static unsigned int efb_scale_denominatorY;
 };
 
-extern Renderer *g_renderer;
+extern std::unique_ptr<Renderer> g_renderer;