ddnet/src/engine/client/backend_sdl.h

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#ifndef ENGINE_CLIENT_BACKEND_SDL_H
#define ENGINE_CLIENT_BACKEND_SDL_H
#include "SDL.h"
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#include <base/detect.h>
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#include "graphics_defines.h"
#include "blocklist_driver.h"
#include "graphics_threaded.h"
#include <base/tl/threading.h>
#include <atomic>
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#include <condition_variable>
#include <mutex>
#include <thread>
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#include <vector>
#if defined(CONF_PLATFORM_MACOS)
#include <objc/objc-runtime.h>
class CAutoreleasePool
{
private:
id m_Pool;
public:
CAutoreleasePool()
{
Class NSAutoreleasePoolClass = (Class)objc_getClass("NSAutoreleasePool");
m_Pool = class_createInstance(NSAutoreleasePoolClass, 0);
SEL selector = sel_registerName("init");
((id(*)(id, SEL))objc_msgSend)(m_Pool, selector);
}
~CAutoreleasePool()
{
SEL selector = sel_registerName("drain");
((id(*)(id, SEL))objc_msgSend)(m_Pool, selector);
}
};
#endif
// basic threaded backend, abstract, missing init and shutdown functions
class CGraphicsBackend_Threaded : public IGraphicsBackend
{
public:
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// constructed on the main thread, the rest of the functions is run on the render thread
class ICommandProcessor
{
public:
virtual ~ICommandProcessor() {}
virtual void RunBuffer(CCommandBuffer *pBuffer) = 0;
};
CGraphicsBackend_Threaded();
virtual void RunBuffer(CCommandBuffer *pBuffer);
virtual bool IsIdle() const;
virtual void WaitForIdle();
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protected:
void StartProcessor(ICommandProcessor *pProcessor);
void StopProcessor();
private:
ICommandProcessor *m_pProcessor;
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std::mutex m_BufferSwapMutex;
std::condition_variable m_BufferSwapCond;
std::condition_variable m_BufferDoneCond;
CCommandBuffer *m_pBuffer;
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std::atomic_bool m_Shutdown;
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std::atomic_bool m_BufferInProcess;
std::thread m_Thread;
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void ThreadFunc();
};
// takes care of implementation independent operations
class CCommandProcessorFragment_General
{
void Cmd_Nop();
void Cmd_Signal(const CCommandBuffer::SCommand_Signal *pCommand);
public:
bool RunCommand(const CCommandBuffer::SCommand *pBaseCommand);
};
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enum EBackendType
{
BACKEND_TYPE_OPENGL = 0,
BACKEND_TYPE_OPENGL_ES,
};
struct SBackendCapabilites
{
bool m_TileBuffering;
bool m_QuadBuffering;
bool m_TextBuffering;
bool m_QuadContainerBuffering;
bool m_MipMapping;
bool m_NPOTTextures;
bool m_3DTextures;
bool m_2DArrayTextures;
bool m_2DArrayTexturesAsExtension;
bool m_ShaderSupport;
int m_ContextMajor;
int m_ContextMinor;
int m_ContextPatch;
};
// takes care of sdl related commands
class CCommandProcessorFragment_SDL
{
// SDL stuff
SDL_Window *m_pWindow;
SDL_GLContext m_GLContext;
public:
enum
{
CMD_INIT = CCommandBuffer::CMDGROUP_PLATFORM_SDL,
CMD_SHUTDOWN,
};
struct SCommand_Init : public CCommandBuffer::SCommand
{
SCommand_Init() :
SCommand(CMD_INIT) {}
SDL_Window *m_pWindow;
SDL_GLContext m_GLContext;
};
struct SCommand_Shutdown : public CCommandBuffer::SCommand
{
SCommand_Shutdown() :
SCommand(CMD_SHUTDOWN) {}
};
private:
void Cmd_Init(const SCommand_Init *pCommand);
void Cmd_Shutdown(const SCommand_Shutdown *pCommand);
void Cmd_Swap(const CCommandBuffer::SCommand_Swap *pCommand);
void Cmd_VSync(const CCommandBuffer::SCommand_VSync *pCommand);
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void Cmd_WindowCreateNtf(const CCommandBuffer::SCommand_WindowCreateNtf *pCommand);
void Cmd_WindowDestroyNtf(const CCommandBuffer::SCommand_WindowDestroyNtf *pCommand);
public:
CCommandProcessorFragment_SDL();
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bool RunCommand(const CCommandBuffer::SCommand *pBaseCommand);
};
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class CCommandProcessorFragment_OpenGLBase
{
public:
virtual ~CCommandProcessorFragment_OpenGLBase() = default;
virtual bool RunCommand(const CCommandBuffer::SCommand *pBaseCommand) = 0;
enum
{
CMD_INIT = CCommandBuffer::CMDGROUP_PLATFORM_OPENGL,
CMD_SHUTDOWN = CMD_INIT + 1,
};
struct SCommand_Init : public CCommandBuffer::SCommand
{
SCommand_Init() :
SCommand(CMD_INIT) {}
class IStorage *m_pStorage;
std::atomic<int> *m_pTextureMemoryUsage;
SBackendCapabilites *m_pCapabilities;
int *m_pInitError;
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const char **m_pErrStringPtr;
char *m_pVendorString;
char *m_pVersionString;
char *m_pRendererString;
int m_RequestedMajor;
int m_RequestedMinor;
int m_RequestedPatch;
EBackendType m_RequestedBackend;
int m_GlewMajor;
int m_GlewMinor;
int m_GlewPatch;
};
struct SCommand_Shutdown : public CCommandBuffer::SCommand
{
SCommand_Shutdown() :
SCommand(CMD_SHUTDOWN) {}
};
};
// command processor impelementation, uses the fragments to combine into one processor
class CCommandProcessor_SDL_OpenGL : public CGraphicsBackend_Threaded::ICommandProcessor
{
CCommandProcessorFragment_OpenGLBase *m_pOpenGL;
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CCommandProcessorFragment_SDL m_SDL;
CCommandProcessorFragment_General m_General;
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EBackendType m_BackendType;
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public:
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CCommandProcessor_SDL_OpenGL(EBackendType BackendType, int OpenGLMajor, int OpenGLMinor, int OpenGLPatch);
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virtual ~CCommandProcessor_SDL_OpenGL();
virtual void RunBuffer(CCommandBuffer *pBuffer);
};
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static constexpr size_t gs_GPUInfoStringSize = 256;
// graphics backend implemented with SDL and OpenGL
class CGraphicsBackend_SDL_OpenGL : public CGraphicsBackend_Threaded
{
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SDL_Window *m_pWindow = NULL;
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SDL_GLContext m_GLContext;
ICommandProcessor *m_pProcessor;
std::atomic<int> m_TextureMemoryUsage;
int m_NumScreens;
SBackendCapabilites m_Capabilites;
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char m_aVendorString[gs_GPUInfoStringSize] = {};
char m_aVersionString[gs_GPUInfoStringSize] = {};
char m_aRendererString[gs_GPUInfoStringSize] = {};
bool m_UseNewOpenGL;
EBackendType m_BackendType;
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char m_aErrorString[256];
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static EBackendType DetectBackend();
static void ClampDriverVersion(EBackendType BackendType);
public:
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virtual int Init(const char *pName, int *Screen, int *pWidth, int *pHeight, int *pRefreshRate, int FsaaSamples, int Flags, int *pDesktopWidth, int *pDesktopHeight, int *pCurrentWidth, int *pCurrentHeight, class IStorage *pStorage);
virtual int Shutdown();
virtual int MemoryUsage() const;
virtual int GetNumScreens() const { return m_NumScreens; }
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virtual void GetVideoModes(CVideoMode *pModes, int MaxModes, int *pNumModes, int HiDPIScale, int MaxWindowWidth, int MaxWindowHeight, int Screen);
virtual void GetCurrentVideoMode(CVideoMode &CurMode, int HiDPIScale, int MaxWindowWidth, int MaxWindowHeight, int Screen);
virtual void Minimize();
virtual void Maximize();
virtual void SetWindowParams(int FullscreenMode, bool IsBorderless);
virtual bool SetWindowScreen(int Index);
virtual bool UpdateDisplayMode(int Index);
virtual int GetWindowScreen();
virtual int WindowActive();
virtual int WindowOpen();
virtual void SetWindowGrab(bool Grab);
virtual bool ResizeWindow(int w, int h, int RefreshRate);
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virtual void GetViewportSize(int &w, int &h);
virtual void NotifyWindow();
virtual void GetDriverVersion(EGraphicsDriverAgeType DriverAgeType, int &Major, int &Minor, int &Patch);
virtual bool IsConfigModernAPI() { return IsModernAPI(m_BackendType); }
virtual bool IsNewOpenGL() { return m_UseNewOpenGL; }
virtual bool HasTileBuffering() { return m_Capabilites.m_TileBuffering; }
virtual bool HasQuadBuffering() { return m_Capabilites.m_QuadBuffering; }
virtual bool HasTextBuffering() { return m_Capabilites.m_TextBuffering; }
virtual bool HasQuadContainerBuffering() { return m_Capabilites.m_QuadContainerBuffering; }
virtual bool Has2DTextureArrays() { return m_Capabilites.m_2DArrayTextures; }
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virtual const char *GetErrorString()
{
if(m_aErrorString[0] != '\0')
return m_aErrorString;
return NULL;
}
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virtual const char *GetVendorString()
{
return m_aVendorString;
}
virtual const char *GetVersionString()
{
return m_aVersionString;
}
virtual const char *GetRendererString()
{
return m_aRendererString;
}
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static bool IsModernAPI(EBackendType BackendType);
};
#endif // ENGINE_CLIENT_BACKEND_SDL_H