backend_base.h

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#ifndef ENGINE_CLIENT_BACKEND_BACKEND_BASE_H
#define ENGINE_CLIENT_BACKEND_BACKEND_BASE_H
 
#include <engine/client/graphics_threaded.h>
#include <engine/graphics.h>
 
#include <SDL_video.h>
 
#include <atomic>
#include <cstddef>
#include <cstdint>
#include <string>
#include <vector>
 
struct SBackendCapabilities;
 
enum EDebugGfxModes
{
    DEBUG_GFX_MODE_NONE = 0,
    DEBUG_GFX_MODE_MINIMUM,
    DEBUG_GFX_MODE_AFFECTS_PERFORMANCE,
    DEBUG_GFX_MODE_VERBOSE,
    DEBUG_GFX_MODE_ALL,
};
 
enum ERunCommandReturnTypes
{
    RUN_COMMAND_COMMAND_HANDLED = 0,
    RUN_COMMAND_COMMAND_UNHANDLED,
    RUN_COMMAND_COMMAND_WARNING,
    RUN_COMMAND_COMMAND_ERROR,
};
 
enum EGfxErrorType
{
    GFX_ERROR_TYPE_NONE = 0,
    GFX_ERROR_TYPE_INIT,
    GFX_ERROR_TYPE_OUT_OF_MEMORY_IMAGE,
    GFX_ERROR_TYPE_OUT_OF_MEMORY_BUFFER,
    GFX_ERROR_TYPE_OUT_OF_MEMORY_STAGING,
    GFX_ERROR_TYPE_RENDER_RECORDING,
    GFX_ERROR_TYPE_RENDER_CMD_FAILED,
    GFX_ERROR_TYPE_RENDER_SUBMIT_FAILED,
    GFX_ERROR_TYPE_SWAP_FAILED,
    GFX_ERROR_TYPE_UNKNOWN,
};
 
enum EGfxWarningType
{
    GFX_WARNING_TYPE_NONE = 0,
    GFX_WARNING_TYPE_INIT_FAILED,
    GFX_WARNING_TYPE_INIT_FAILED_MISSING_INTEGRATED_GPU_DRIVER,
    GFX_WARNING_TYPE_INIT_FAILED_NO_DEVICE_WITH_REQUIRED_VERSION,
    GFX_WARNING_LOW_ON_MEMORY,
    GFX_WARNING_MISSING_EXTENSION,
    GFX_WARNING_TYPE_UNKNOWN,
};
 
struct SGfxErrorContainer
{
    struct SError
    {
        bool m_RequiresTranslation;
        std::string m_Err;
 
        bool operator==(const SError &Other) const
        {
            return m_RequiresTranslation == Other.m_RequiresTranslation && m_Err == Other.m_Err;
        }
    };
    EGfxErrorType m_ErrorType = EGfxErrorType::GFX_ERROR_TYPE_NONE;
    std::vector<SError> m_vErrors;
};
 
struct SGfxWarningContainer
{
    EGfxWarningType m_WarningType = EGfxWarningType::GFX_WARNING_TYPE_NONE;
    std::vector<std::string> m_vWarnings;
};
 
class CCommandProcessorFragment_GLBase
{
protected:
    SGfxErrorContainer m_Error;
    SGfxWarningContainer m_Warning;
 
    static bool Texture2DTo3D(uint8_t *pImageBuffer, int ImageWidth, int ImageHeight, size_t PixelSize, int SplitCountWidth, int SplitCountHeight, uint8_t *pTarget3DImageData, int &Target3DImageWidth, int &Target3DImageHeight);
 
    virtual bool GetPresentedImageData(uint32_t &Width, uint32_t &Height, CImageInfo::EImageFormat &Format, std::vector<uint8_t> &vDstData) = 0;
 
public:
    virtual ~CCommandProcessorFragment_GLBase() = default;
    virtual ERunCommandReturnTypes RunCommand(const CCommandBuffer::SCommand *pBaseCommand) = 0;
 
    virtual void StartCommands(size_t CommandCount, size_t EstimatedRenderCallCount) {}
    virtual void EndCommands() {}
 
    const SGfxErrorContainer &GetError() { return m_Error; }
    virtual void ErroneousCleanup() {}
 
    const SGfxWarningContainer &GetWarning() { return m_Warning; }
 
    enum
    {
        CMD_PRE_INIT = CCommandBuffer::CMDGROUP_PLATFORM_GL,
        CMD_INIT,
        CMD_SHUTDOWN,
        CMD_POST_SHUTDOWN,
    };
 
    struct SCommand_PreInit : public CCommandBuffer::SCommand
    {
        SCommand_PreInit() :
            SCommand(CMD_PRE_INIT) {}
 
        SDL_Window *m_pWindow;
        uint32_t m_Width;
        uint32_t m_Height;
 
        char *m_pVendorString;
        char *m_pVersionString;
        char *m_pRendererString;
 
        TTwGraphicsGpuList *m_pGpuList;
    };
 
    struct SCommand_Init : public CCommandBuffer::SCommand
    {
        SCommand_Init() :
            SCommand(CMD_INIT) {}
 
        SDL_Window *m_pWindow;
        uint32_t m_Width;
        uint32_t m_Height;
 
        class IStorage *m_pStorage;
        std::atomic<uint64_t> *m_pTextureMemoryUsage;
        std::atomic<uint64_t> *m_pBufferMemoryUsage;
        std::atomic<uint64_t> *m_pStreamMemoryUsage;
        std::atomic<uint64_t> *m_pStagingMemoryUsage;
 
        TTwGraphicsGpuList *m_pGpuList;
 
        TGLBackendReadPresentedImageData *m_pReadPresentedImageDataFunc;
 
        SBackendCapabilities *m_pCapabilities;
        int *m_pInitError;
 
        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) {}
    };
 
    struct SCommand_PostShutdown : public CCommandBuffer::SCommand
    {
        SCommand_PostShutdown() :
            SCommand(CMD_POST_SHUTDOWN) {}
    };
};
 
#endif