GlobalGraphicsInfo.hpp

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#pragma once
 
#include "MayaFlux/Transitive/Reflect/Mirror.hpp"
 
namespace MayaFlux::Core {
 
//==============================================================================
// GRAPHICS BACKEND CONFIGURATION (Vulkan/OpenGL/etc.)
//==============================================================================
 
/**
 * @struct GraphicsBackendInfo
 * @brief Configuration for graphics API backend (Vulkan/OpenGL/etc.)
 *
 * Separate from windowing - this is GPU/rendering configuration.
 * GraphicsSurfaceInfo handles windows, this handles the graphics API.
 */
struct MAYAFLUX_API GraphicsBackendInfo {
    /** @brief Enable validation layers; defaults on in debug builds. */
#if defined(MAYAFLUX_DEBUG) && MAYAFLUX_DEBUG
    bool enable_validation = true;
#else
    bool enable_validation = false;
#endif
 
    /** @brief Enable GPU debug markers (for profiling tools) */
    bool enable_debug_markers = false;
 
    /** @brief Required device features (Vulkan-specific) */
    struct {
        bool compute_shaders = true;
        bool geometry_shaders = false;
        bool tessellation_shaders = false;
        bool multi_viewport = false;
        bool sampler_anisotropy = true;
        bool fill_mode_non_solid = false;
    } required_features;
 
    /**
     * @brief Preferred physical device class when no explicit selector matches.
     *
     * AUTO scores discrete above integrated above virtual above everything
     * else. The other values pin the class; if no device of that class
     * survives the presentation and extension filters, selection falls back
     * to AUTO ordering unless strict_device_selection is set.
     *
     * EXTERNAL is a heuristic, not a device type. Vulkan reports an external GPU
     * as DISCRETE GPU, indistinguishable from a built-in one. EXTERNAL therefore
     * means DISCRETE plus a preference for the highest PCI bus number, since
     * a Thunderbolt-attached device sits behind a PCIe switch well above the
     * root complex. It requires VK_EXT_pci_bus_info; without that extension
     * EXTERNAL behaves as DISCRETE and says so in the log.
     */
    enum class DevicePreference : uint8_t {
        AUTO,
        DISCRETE,
        INTEGRATED,
        VIRTUAL,
        EXTERNAL
    } device_preference = DevicePreference::AUTO;
 
    /** @brief Index into enumeration order; negative disables. Debugging escape hatch, prefer device_uuid. */
    int32_t device_index = -1;
 
    /** @brief Device UUID as 32 lowercase hex chars, no separators; empty disables. Read it from the startup candidate table. */
    std::string device_uuid;
 
    /** @brief Case-insensitive substring of the device name; empty disables. Ambiguous matches take the highest scoring one. */
    std::string device_name;
 
    /** @brief Require the graphics queue family to support presentation. Set false for headless or compute-only. */
    bool require_presentation = true;
 
    /** @brief Treat an unmatched selector as fatal rather than falling back to scoring. */
    bool strict_device_selection = false;
 
    /** @brief Memory allocation strategy */
    enum class MemoryStrategy : uint8_t {
        CONSERVATIVE, ///< Minimize allocations
        BALANCED, ///< Balance speed and memory
        AGGRESSIVE ///< Maximize performance
    } memory_strategy = MemoryStrategy::BALANCED;
 
    /** @brief Command buffer pooling strategy */
    enum class CommandPooling : uint8_t {
        PER_THREAD, ///< One pool per thread
        SHARED, ///< Shared pool
        PER_QUEUE ///< One pool per queue family
    } command_pooling = CommandPooling::PER_THREAD;
 
    /** @brief Maximum number of frames in flight (GPU pipelining) */
    uint32_t max_frames_in_flight = 2;
 
    /** @brief Enable compute queue (separate from graphics) */
    bool enable_compute_queue = true;
 
    /** @brief Enable transfer queue (separate from graphics) */
    bool enable_transfer_queue = false;
 
    /** @brief Shader compilation strategy */
    enum class ShaderCompilation : uint8_t {
        RUNTIME, ///< Compile at runtime
        PRECOMPILED, ///< Use pre-compiled SPIR-V
        CACHED ///< Cache compiled shaders
    } shader_compilation = ShaderCompilation::CACHED;
 
    /** @brief Shader cache directory (if caching enabled) */
    std::filesystem::path shader_cache_dir = "cache/shaders";
 
    /** @brief Backend-specific extensions to request */
    std::vector<std::string> required_extensions;
    std::vector<std::string> optional_extensions;
 
    static constexpr auto describe()
    {
        return std::make_tuple(
            Reflect::member("enable_validation", &GraphicsBackendInfo::enable_validation),
            Reflect::member("enable_debug_markers", &GraphicsBackendInfo::enable_debug_markers),
            Reflect::member("device_preference", &GraphicsBackendInfo::device_preference),
            Reflect::member("device_index", &GraphicsBackendInfo::device_index),
            Reflect::member("device_uuid", &GraphicsBackendInfo::device_uuid),
            Reflect::member("device_name", &GraphicsBackendInfo::device_name),
            Reflect::member("require_presentation", &GraphicsBackendInfo::require_presentation),
            Reflect::member("strict_device_selection", &GraphicsBackendInfo::strict_device_selection),
            // Reflect::member("required_features", &GraphicsBackendInfo::required_features),
            Reflect::member("memory_strategy", &GraphicsBackendInfo::memory_strategy),
            Reflect::member("command_pooling", &GraphicsBackendInfo::command_pooling),
            Reflect::member("max_frames_in_flight", &GraphicsBackendInfo::max_frames_in_flight),
            Reflect::member("enable_compute_queue", &GraphicsBackendInfo::enable_compute_queue),
            Reflect::member("enable_transfer_queue", &GraphicsBackendInfo::enable_transfer_queue),
            Reflect::member("shader_compilation", &GraphicsBackendInfo::shader_compilation),
            Reflect::member("shader_cache_dir", &GraphicsBackendInfo::shader_cache_dir),
            Reflect::member("required_extensions", &GraphicsBackendInfo::required_extensions),
            Reflect::member("optional_extensions", &GraphicsBackendInfo::optional_extensions));
    }
};
 
/**
 * @struct GraphicsResourceLimits
 * @brief Resource limits and budgets for graphics subsystem
 *
 * Prevents runaway resource usage, similar to audio buffer limits.
 */
struct MAYAFLUX_API GraphicsResourceLimits {
    /** @brief Maximum number of concurrent windows */
    uint32_t max_windows = 16;
 
    /** @brief Maximum staging buffer size (MB) */
    uint32_t max_staging_buffer_mb = 256;
 
    /** @brief Maximum compute buffer size (MB) */
    uint32_t max_compute_buffer_mb = 1024;
 
    /** @brief Maximum texture cache size (MB) */
    uint32_t max_texture_cache_mb = 2048;
 
    /** @brief Maximum number of descriptor sets */
    uint32_t max_descriptor_sets = 1024;
 
    /** @brief Maximum number of pipeline state objects */
    uint32_t max_pipelines = 256;
 
    static constexpr auto describe()
    {
        return std::make_tuple(
            Reflect::member("max_windows", &GraphicsResourceLimits::max_windows),
            Reflect::member("max_staging_buffer_mb", &GraphicsResourceLimits::max_staging_buffer_mb),
            Reflect::member("max_compute_buffer_mb", &GraphicsResourceLimits::max_compute_buffer_mb),
            Reflect::member("max_texture_cache_mb", &GraphicsResourceLimits::max_texture_cache_mb),
            Reflect::member("max_descriptor_sets", &GraphicsResourceLimits::max_descriptor_sets),
            Reflect::member("max_pipelines", &GraphicsResourceLimits::max_pipelines));
    }
};
 
//==============================================================================
// GLOBAL VISUAL STREAM INFO (Parallel to GlobalStreamInfo)
//==============================================================================
 
/**
 * @struct GraphicsSurfaceInfo
 * @brief System-wide configuration for visual stream processing
 *
 * Defines technical parameters for ALL windows/visual streams in the system.
 * This is set once at subsystem initialization, similar to audio sample rate.
 * Individual windows inherit these defaults but can override specific params.
 */
struct MAYAFLUX_API GraphicsSurfaceInfo {
 
    /**
     * @enum SurfaceFormat
     * @brief Default pixel format for window surfaces (Vulkan-compatible)
     */
    enum class SurfaceFormat : uint8_t {
        B8G8R8A8_SRGB, ///< Most common - 8-bit SRGB
        R8G8B8A8_SRGB, ///< Alternative 8-bit SRGB
        B8G8R8A8_UNORM, ///< 8-bit linear
        R8G8B8A8_UNORM, ///< 8-bit linear
        R16G16B16A16_SFLOAT, ///< 16-bit float HDR
        A2B10G10R10_UNORM, ///< 10-bit HDR
        R32G32B32A32_SFLOAT, ///< 32-bit float
    };
 
    /** @brief Default surface format for new windows */
    SurfaceFormat format = SurfaceFormat::B8G8R8A8_SRGB;
 
    /**
     * @enum ColorSpace
     * @brief Default color space for window surfaces
     */
    enum class ColorSpace : uint8_t {
        SRGB_NONLINEAR, ///< Standard sRGB
        EXTENDED_SRGB, ///< Extended sRGB for HDR
        HDR10_ST2084, ///< HDR10 PQ
        DISPLAY_P3, ///< DCI-P3
    };
 
    /** @brief Default color space for new windows */
    ColorSpace color_space = ColorSpace::SRGB_NONLINEAR;
 
    /**
     * @enum PresentMode
     * @brief Frame presentation strategy
     */
    enum class PresentMode : uint8_t {
        IMMEDIATE, ///< No vsync, tear possible
        MAILBOX, ///< Triple buffering, no tear
        FIFO, ///< Vsync, no tear
        FIFO_RELAXED, ///< Vsync, tear if late
    };
 
    /** @brief Default presentation mode for new windows */
    PresentMode present_mode = PresentMode::FIFO;
 
    /** @brief Default number of swapchain images (double/triple buffering) */
    uint32_t image_count = 3;
 
    /** @brief Enable region-based processing by default */
    bool enable_regions = true;
 
    /** @brief Maximum regions per window container */
    uint32_t max_regions_per_window = 256;
 
    /** @brief Enable HDR output if available */
    bool enable_hdr {};
 
    /** @brief Measure and report actual frame times */
    bool measure_frame_time {};
 
    /** @brief Backend-specific configuration parameters */
    std::unordered_map<std::string, std::any> backend_options;
 
    static constexpr auto describe()
    {
        return std::make_tuple(
            Reflect::member("format", &GraphicsSurfaceInfo::format),
            Reflect::member("color_space", &GraphicsSurfaceInfo::color_space),
            Reflect::member("present_mode", &GraphicsSurfaceInfo::present_mode),
            Reflect::member("image_count", &GraphicsSurfaceInfo::image_count),
            Reflect::member("enable_regions", &GraphicsSurfaceInfo::enable_regions),
            Reflect::member("max_regions_per_window", &GraphicsSurfaceInfo::max_regions_per_window),
            Reflect::member("enable_hdr", &GraphicsSurfaceInfo::enable_hdr),
            Reflect::member("measure_frame_time", &GraphicsSurfaceInfo::measure_frame_time));
    }
};
 
/**
 * @struct KeyRepeatConfig
 * @brief Key repeat timing for native window backends.
 *
 * Wayland, Win32 and Cocoa backends implement client-side repeat using these values.
 */
struct KeyRepeatConfig {
    /** @brief Delay before repeat starts in milliseconds. */
    uint32_t initial_delay_ms { 90 };
 
    /** @brief Interval between repeat events in milliseconds. */
    uint32_t interval_ms { 16 };
 
    /** @brief Delay before text character repeat starts in milliseconds. */
    uint32_t text_initial_delay_ms { 400 };
 
    /** @brief Interval between repeated text character events in milliseconds. */
    uint32_t text_interval_ms { 33 };
 
    /** @brief If true, compositor-reported repeat_info overrides these values. */
    bool allow_compositor_override { false };
 
    static constexpr auto describe()
    {
        return std::make_tuple(
            Reflect::member("initial_delay_ms", &KeyRepeatConfig::initial_delay_ms),
            Reflect::member("interval_ms", &KeyRepeatConfig::interval_ms),
            Reflect::member("text_initial_delay_ms", &KeyRepeatConfig::text_initial_delay_ms),
            Reflect::member("text_interval_ms", &KeyRepeatConfig::text_interval_ms),
            Reflect::member("allow_compositor_override", &KeyRepeatConfig::allow_compositor_override));
    }
};
 
/**
 * @struct TextConfig
 * @brief Default font configuration for Portal::Text.
 *
 * When present, GraphicsSubsystem initializes Portal::Text and attempts to
 * load the specified font as the system default.  Users may call
 * Portal::Text::set_default_font() at any time after initialization to
 * replace or augment this.
 *
 * When absent, Portal::Text is still initialized but no default atlas is
 * created; any call to InkPress that requires a default atlas will log an
 * error until the user sets one explicitly.
 */
struct TextConfig {
    /** @brief Font family name forwarded to Platform::find_font(). */
    std::string family;
 
    /** @brief Optional style hint (e.g. "Regular", "Bold"). */
    std::string style;
 
    /** @brief Glyph rasterization height in pixels. */
    uint32_t pixel_size { 24 };
 
    /** @brief Atlas texture dimension (power of two). */
    uint32_t atlas_size { 512 };
 
    static constexpr auto describe()
    {
        return std::make_tuple(
            Reflect::member("family", &TextConfig::family),
            Reflect::member("style", &TextConfig::style),
            Reflect::member("pixel_size", &TextConfig::pixel_size),
            Reflect::member("atlas_size", &TextConfig::atlas_size));
    }
};
 
struct MAYAFLUX_API GlobalGraphicsConfig {
    /** @brief Key repeat timing for native Wayland, Win32 and Cocoa backends. */
    KeyRepeatConfig key_repeat_config;
 
    /** @brief System-wide configuration for visual stream processing */
    GraphicsSurfaceInfo surface_info;
 
    /** @brief Graphics backend configuration */
    GraphicsBackendInfo backend_info;
 
    /** @brief Resource limits */
    GraphicsResourceLimits resource_limits;
 
    /**
     * @enum WindowingBackend
     * @brief Windowing library selection
     */
    enum class WindowingBackend : uint8_t {
        WINDOWS, ///< Native Win32
        WAYLAND, ///< Native Wayland
        COCOA, ///< Native Cocoa
        NONE ///< No windowing (offscreen rendering only)
    };
 
    /**
     * @enum VisualApi
     * @brief Supported graphics APIs (backend selection)
     */
    enum class GraphicsApi : uint8_t {
        VULKAN,
        OPENGL,
        METAL,
        DIRECTX12
    };
 
    /** @brief Target frame rate for visual processing (Hz) */
    uint32_t target_frame_rate = 60;
 
#if defined(MAYAFLUX_PLATFORM_WINDOWS)
#ifndef WIN32_BACKEND
#error "Windows builds require WIN32_BACKEND"
#endif // WIN32_BACKEND
    /** @brief Selected windowing backend */
    WindowingBackend windowing_backend = WindowingBackend::WINDOWS;
#elif defined(WAYLAND_BACKEND)
    /** @brief Selected windowing backend */
    WindowingBackend windowing_backend = WindowingBackend::WAYLAND;
#elif defined(COCOA_BACKEND)
    /** @brief Selected windowing backend */
    WindowingBackend windowing_backend = WindowingBackend::COCOA;
#else
    /** @brief Selected windowing backend */
    WindowingBackend windowing_backend = WindowingBackend::NONE;
#endif //  defined(MAYAFLUX_PLATFORM_WINDOWS) && defined (WIN32_BACKEND)
 
    /** @brief Selected graphics API for rendering */
    GraphicsApi requested_api = GraphicsApi::VULKAN;
 
    /** @brief Default font for Portal::Text. */
    TextConfig text_config {
#if defined(MAYAFLUX_PLATFORM_LINUX)
        "sans-serif", "", 24, 512
#elif defined(MAYAFLUX_PLATFORM_MACOS)
        "Helvetica Neue", "", 24, 512
#elif defined(MAYAFLUX_PLATFORM_WINDOWS)
        "Segoe UI", "", 24, 512
#else
        "sans-serif", "", 24, 512
#endif
    };
 
    static constexpr auto describe()
    {
        return std::make_tuple(
            Reflect::member("key_repeat_config", &GlobalGraphicsConfig::key_repeat_config),
            Reflect::member("surface_info", &GlobalGraphicsConfig::surface_info),
            Reflect::member("backend_info", &GlobalGraphicsConfig::backend_info),
            Reflect::member("resource_limits", &GlobalGraphicsConfig::resource_limits),
            Reflect::member("target_frame_rate", &GlobalGraphicsConfig::target_frame_rate),
            Reflect::member("windowing_backend", &GlobalGraphicsConfig::windowing_backend),
            Reflect::member("requested_api", &GlobalGraphicsConfig::requested_api),
            Reflect::member("text_config", &GlobalGraphicsConfig::text_config));
    }
};
 
//==============================================================================
// PER-WINDOW CREATION INFO (Parallel to audio ChannelConfig)
//==============================================================================
 
/**
 * @struct WindowCreateInfo
 * @brief Configuration for creating a single window instance
 *
 * Lightweight per-window parameters. Most settings inherited from
 * GraphicsSurfaceInfo. This is like creating a new audio channel - you specify
 * only what differs from global defaults.
 */
struct MAYAFLUX_API WindowCreateInfo {
    /** @brief Window title/identifier */
    std::string title { "MayaFlux Window" };
 
    /** @brief Initial window dimensions */
    uint32_t width { 1920 };
    uint32_t height { 1080 };
 
    /** @brief Target monitor ID (-1 = primary monitor) */
    int32_t monitor_id { -1 };
 
    /** @brief Start in fullscreen mode */
    bool fullscreen {};
 
    /** @brief Window can be resized by user */
    bool resizable { true };
 
    /** @brief Show OS window decorations (title bar, borders) */
    bool decorated { true };
 
    /** @brief Transparent framebuffer (compositing) */
    bool transparent {};
 
    /** @brief Window always on top */
    bool floating {};
 
    /** @brief Register this window for processing (if false, no grpahics API handles visuals) */
    bool register_for_processing { true };
 
    /** @brief Override global surface format (nullopt = use global default) */
    std::optional<GraphicsSurfaceInfo::SurfaceFormat> surface_format;
 
    /** @brief Override global present mode (nullopt = use global default) */
    std::optional<GraphicsSurfaceInfo::PresentMode> present_mode;
 
    /** @brief Container dimensions (channels) */
    struct {
        uint32_t color_channels { 4 };
        bool has_depth {};
        bool has_stencil {};
    } container_format;
 
    std::array<float, 4> clear_color { { 0.0F, 0.0F, 0.0F, 1.0F } };
};
 
//==============================================================================
// WINDOW RUNTIME STATE (Read-only, updated by subsystem)
//==============================================================================
 
/**
 * @struct WindowState
 * @brief Runtime state of a window (mutable by system, read by user)
 *
 * You don't set these - the windowing subsystem updates them as events occur.
 */
struct WindowState {
    uint32_t current_width = 0;
    uint32_t current_height = 0;
 
    bool is_visible = true;
    bool is_focused = false;
    bool is_minimized = false;
    bool is_maximized = false;
    bool is_hovered = false;
 
    uint64_t frame_count = 0;
    double last_present_time = 0.0;
    double average_frame_time = 0.0;
};
 
//==============================================================================
// INPUT CONFIGURATION (Runtime mutable)
//==============================================================================
 
/**
 * @enum CursorMode
 * @brief Cursor visibility and behavior
 */
enum class CursorMode : uint8_t {
    NORMAL, ///< Visible and movable
    HIDDEN, ///< Invisible but movable
    DISABLED, ///< Invisible and locked (FPS camera)
    CAPTURED, ///< Invisible, locked, raw motion
};
 
/**
 * @struct InputConfig
 * @brief Input configuration for a window
 *
 * Can be changed at runtime via window->set_input_config()
 */
struct InputConfig {
    bool keyboard_enabled = true;
    bool mouse_enabled = true;
    CursorMode cursor_mode = CursorMode::NORMAL;
 
    bool sticky_keys = false;
    bool sticky_mouse_buttons = false;
    bool raw_mouse_motion = false;
};
 
//==============================================================================
// WINDOW EVENTS
//==============================================================================
 
/**
 * @enum WindowEventType
 * @brief Types of window and input events
 */
enum class WindowEventType : uint8_t {
    WINDOW_CREATED,
    WINDOW_DESTROYED,
    WINDOW_CLOSED,
 
    WINDOW_RESIZED,
    WINDOW_MOVED,
    WINDOW_FOCUS_GAINED,
    WINDOW_FOCUS_LOST,
    WINDOW_MINIMIZED,
    WINDOW_MAXIMIZED,
    WINDOW_RESTORED,
 
    KEY_PRESSED,
    KEY_RELEASED,
    KEY_REPEAT,
    TEXT_INPUT,
    MOUSE_MOTION,
    MOUSE_BUTTON_PRESSED,
    MOUSE_BUTTON_RELEASED,
    MOUSE_SCROLLED,
    MOUSE_ENTERED,
    MOUSE_EXITED,
 
    FRAMEBUFFER_RESIZED,
 
    CUSTOM,
};
 
/**
 * @struct WindowEvent
 * @brief Event data for window and input events
 */
struct WindowEvent {
    WindowEventType type;
    double timestamp;
 
    struct ResizeData {
        uint32_t width, height;
    };
    struct KeyData {
        int16_t key;
        int32_t scancode, mods;
    };
    /// @brief Resolved Unicode codepoint, layout/shift/dead-key/IME composed.
    struct TextData {
        uint32_t codepoint;
    };
    struct MousePosData {
        double x, y;
    };
    struct MouseButtonData {
        int8_t button;
        int32_t mods;
    };
    struct ScrollData {
        double x_offset, y_offset;
    };
 
    using EventData = std::variant<
        std::monostate,
        ResizeData,
        KeyData,
        TextData,
        MousePosData,
        MouseButtonData,
        ScrollData,
        std::any>;
 
    EventData data;
 
    WindowEvent() = default;
    WindowEvent(const WindowEvent&) = default;
    WindowEvent(WindowEvent&&) noexcept = default;
    WindowEvent& operator=(const WindowEvent&) = default;
    WindowEvent& operator=(WindowEvent&&) noexcept = default;
    ~WindowEvent() = default;
};
 
using WindowEventCallback = std::function<void(const WindowEvent&)>;
 
//==============================================================================
// MONITOR INFORMATION (System query, not per-window config)
//==============================================================================
 
/**
 * @struct VideoMode
 * @brief Monitor video mode
 */
struct VideoMode {
    uint32_t width, height;
    uint32_t refresh_rate;
    uint8_t red_bits, green_bits, blue_bits;
 
    bool operator==(const VideoMode& other) const
    {
        return width == other.width && height == other.height && refresh_rate == other.refresh_rate;
    }
};
 
/**
 * @struct MonitorInfo
 * @brief Information about a physical display
 */
struct MonitorInfo {
    int32_t id;
    std::string name;
    int32_t width_mm, height_mm;
    VideoMode current_mode;
    bool is_primary = false;
};
 
} // namespace MayaFlux::Core