ddnet/src/engine/client/backend_sdl.h

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#ifndef ENGINE_CLIENT_BACKEND_SDL_H
#define ENGINE_CLIENT_BACKEND_SDL_H
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#include <SDL_video.h>
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#include <base/detect.h>
#include <engine/graphics.h>
#include <engine/client/graphics_threaded.h>
#include <engine/client/backend/backend_base.h>
#include <atomic>
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#include <condition_variable>
#include <cstddef>
#include <cstdint>
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#include <mutex>
#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
{
private:
TTranslateFunc m_TranslateFunc;
SGFXWarningContainer m_Warning;
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() = default;
virtual void RunBuffer(CCommandBuffer *pBuffer) = 0;
virtual SGFXErrorContainer &GetError() = 0;
virtual void ErroneousCleanup() = 0;
virtual SGFXWarningContainer &GetWarning() = 0;
bool HasError()
{
return GetError().m_ErrorType != GFX_ERROR_TYPE_NONE;
}
bool HasWarning()
{
return GetWarning().m_WarningType != GFX_WARNING_TYPE_NONE;
}
};
CGraphicsBackend_Threaded(TTranslateFunc &&TranslateFunc);
void RunBuffer(CCommandBuffer *pBuffer) override;
void RunBufferSingleThreadedUnsafe(CCommandBuffer *pBuffer) override;
bool IsIdle() const override;
void WaitForIdle() override;
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void ProcessError();
protected:
void StartProcessor(ICommandProcessor *pProcessor);
void StopProcessor();
bool HasWarning()
{
return m_Warning.m_WarningType != GFX_WARNING_TYPE_NONE;
}
// returns true if the error msg was shown
virtual bool TryCreateMsgBox(bool AsError, const char *pTitle, const char *pMsg) = 0;
private:
ICommandProcessor *m_pProcessor;
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std::mutex m_BufferSwapMutex;
std::condition_variable m_BufferSwapCond;
CCommandBuffer *m_pBuffer;
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std::atomic_bool m_Shutdown;
bool m_Started = false;
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std::atomic_bool m_BufferInProcess;
void *m_pThread;
static void ThreadFunc(void *pUser);
public:
bool GetWarning(std::vector<std::string> &WarningStrings) override;
};
// 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);
};
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;
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// use quads as much as possible, even if the user config says otherwise
bool m_TrianglesAsQuads;
int m_ContextMajor;
int m_ContextMinor;
int m_ContextPatch;
};
// takes care of sdl related commands
class CCommandProcessorFragment_SDL
{
// SDL stuff
SDL_Window *m_pWindow = nullptr;
SDL_GLContext m_GLContext = nullptr;
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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// command processor implementation, uses the fragments to combine into one processor
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class CCommandProcessor_SDL_GL : public CGraphicsBackend_Threaded::ICommandProcessor
{
CCommandProcessorFragment_GLBase *m_pGLBackend;
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CCommandProcessorFragment_SDL m_SDL;
CCommandProcessorFragment_General m_General;
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EBackendType m_BackendType;
SGFXErrorContainer m_Error;
SGFXWarningContainer m_Warning;
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public:
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CCommandProcessor_SDL_GL(EBackendType BackendType, int GLMajor, int GLMinor, int GLPatch);
virtual ~CCommandProcessor_SDL_GL();
void RunBuffer(CCommandBuffer *pBuffer) override;
SGFXErrorContainer &GetError() override;
void ErroneousCleanup() override;
SGFXWarningContainer &GetWarning() override;
void HandleError();
void HandleWarning();
};
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static constexpr size_t gs_GPUInfoStringSize = 256;
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// graphics backend implemented with SDL and the graphics library @see EBackendType
class CGraphicsBackend_SDL_GL : public CGraphicsBackend_Threaded
{
SDL_Window *m_pWindow = nullptr;
SDL_GLContext m_GLContext = nullptr;
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ICommandProcessor *m_pProcessor = nullptr;
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std::atomic<uint64_t> m_TextureMemoryUsage{0};
std::atomic<uint64_t> m_BufferMemoryUsage{0};
std::atomic<uint64_t> m_StreamMemoryUsage{0};
std::atomic<uint64_t> m_StagingMemoryUsage{0};
TTWGraphicsGPUList m_GPUList;
TGLBackendReadPresentedImageData m_ReadPresentedImageDataFunc;
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] = {};
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EBackendType m_BackendType = BACKEND_TYPE_AUTO;
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char m_aErrorString[256];
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static EBackendType DetectBackend();
static void ClampDriverVersion(EBackendType BackendType);
protected:
bool TryCreateMsgBox(bool AsError, const char *pTitle, const char *pMsg) override;
public:
CGraphicsBackend_SDL_GL(TTranslateFunc &&TranslateFunc);
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int Init(const char *pName, int *pScreen, int *pWidth, int *pHeight, int *pRefreshRate, int *pFsaaSamples, int Flags, int *pDesktopWidth, int *pDesktopHeight, int *pCurrentWidth, int *pCurrentHeight, class IStorage *pStorage) override;
int Shutdown() override;
uint64_t TextureMemoryUsage() const override;
uint64_t BufferMemoryUsage() const override;
uint64_t StreamedMemoryUsage() const override;
uint64_t StagingMemoryUsage() const override;
const TTWGraphicsGPUList &GetGPUs() const override;
int GetNumScreens() const override { return m_NumScreens; }
void GetVideoModes(CVideoMode *pModes, int MaxModes, int *pNumModes, int HiDPIScale, int MaxWindowWidth, int MaxWindowHeight, int ScreenID) override;
void GetCurrentVideoMode(CVideoMode &CurMode, int HiDPIScale, int MaxWindowWidth, int MaxWindowHeight, int ScreenID) override;
void Minimize() override;
void Maximize() override;
void SetWindowParams(int FullscreenMode, bool IsBorderless, bool AllowResizing) override;
bool SetWindowScreen(int Index) override;
bool UpdateDisplayMode(int Index) override;
int GetWindowScreen() override;
int WindowActive() override;
int WindowOpen() override;
void SetWindowGrab(bool Grab) override;
bool ResizeWindow(int w, int h, int RefreshRate) override;
void GetViewportSize(int &w, int &h) override;
void NotifyWindow() override;
void WindowDestroyNtf(uint32_t WindowID) override;
void WindowCreateNtf(uint32_t WindowID) override;
bool GetDriverVersion(EGraphicsDriverAgeType DriverAgeType, int &Major, int &Minor, int &Patch, const char *&pName, EBackendType BackendType) override;
bool IsConfigModernAPI() override { return IsModernAPI(m_BackendType); }
bool UseTrianglesAsQuad() override { return m_Capabilites.m_TrianglesAsQuads; }
bool HasTileBuffering() override { return m_Capabilites.m_TileBuffering; }
bool HasQuadBuffering() override { return m_Capabilites.m_QuadBuffering; }
bool HasTextBuffering() override { return m_Capabilites.m_TextBuffering; }
bool HasQuadContainerBuffering() override { return m_Capabilites.m_QuadContainerBuffering; }
bool Has2DTextureArrays() override { return m_Capabilites.m_2DArrayTextures; }
const char *GetErrorString() override
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{
if(m_aErrorString[0] != '\0')
return m_aErrorString;
return NULL;
}
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const char *GetVendorString() override
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{
return m_aVendorString;
}
const char *GetVersionString() override
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{
return m_aVersionString;
}
const char *GetRendererString() override
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{
return m_aRendererString;
}
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TGLBackendReadPresentedImageData &GetReadPresentedImageDataFuncUnsafe() override;
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static bool IsModernAPI(EBackendType BackendType);
};
#endif // ENGINE_CLIENT_BACKEND_SDL_H