// dear imgui: CPU framebuffer renderer backend
// (supports caller-owned framebuffers/textures in generic packed pixel formats)
//
// Implemented features:
//  [X] Renderer: User texture binding. Use 'ImGui_ImplCPU_Texture*' as texture identifier.
//  [X] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices.
//  [X] Renderer: Texture updates support for dynamic font atlas.

#pragma once
#ifndef IMGUI_DISABLE
#include "imgui.h"

struct ImGui_ImplCPU_PixelFormat;
typedef ImU32 (*ImGui_ImplCPU_MapColorFn)(const ImGui_ImplCPU_PixelFormat* format, unsigned char r, unsigned char g, unsigned char b, unsigned char a);

struct ImGui_ImplCPU_PixelFormat
{
    int                         BitsPerPixel;
    int                         BytesPerPixel;
    ImU32                       Rmask;
    ImU32                       Gmask;
    ImU32                       Bmask;
    ImU32                       Amask;
    ImU8                        Rshift;
    ImU8                        Gshift;
    ImU8                        Bshift;
    ImU8                        Ashift;
    ImU8                        Rloss;
    ImU8                        Gloss;
    ImU8                        Bloss;
    ImU8                        Aloss;
    const ImU32*                Palette;        // Optional palette entries stored as IM_COL32(r, g, b, a).
    int                         PaletteSize;    // Number of palette entries, or 0 when Palette is unused.
    ImGui_ImplCPU_MapColorFn    MapColorFn;     // Optional indexed/paletted mapping override. Return a raw packed pixel value.
};

enum ImGui_ImplCPU_BuiltinFormat
{
    ImGui_ImplCPU_BuiltinFormat_RGBA8888 = 0,
    ImGui_ImplCPU_BuiltinFormat_BGRA8888,
    ImGui_ImplCPU_BuiltinFormat_ARGB8888,
    ImGui_ImplCPU_BuiltinFormat_ABGR8888,
    ImGui_ImplCPU_BuiltinFormat_RGB565,
    ImGui_ImplCPU_BuiltinFormat_ARGB1555,
    ImGui_ImplCPU_BuiltinFormat_RGBA4444,
    ImGui_ImplCPU_BuiltinFormat_RGB888,
    ImGui_ImplCPU_BuiltinFormat_BGR888,
    ImGui_ImplCPU_BuiltinFormat_Alpha8,
    ImGui_ImplCPU_BuiltinFormat_COUNT
};

struct ImGui_ImplCPU_Framebuffer
{
    unsigned char*                  Pixels;
    int                             Width;
    int                             Height;
    int                             Pitch;
    const ImGui_ImplCPU_PixelFormat* Format;    // Optional. Defaults to ImGui_ImplCPU_BuiltinFormat_RGBA8888.
};

struct ImGui_ImplCPU_Texture
{
    const unsigned char*            Pixels;
    int                             Width;
    int                             Height;
    int                             Pitch;
    const ImGui_ImplCPU_PixelFormat* Format;    // Optional. Defaults to ImGui_ImplCPU_BuiltinFormat_RGBA8888.
};

// Follow "Getting Started" link and check examples/ folder to learn about using backends!
IMGUI_IMPL_API const ImGui_ImplCPU_PixelFormat* ImGui_ImplCPU_GetBuiltinPixelFormat(ImGui_ImplCPU_BuiltinFormat format);
IMGUI_IMPL_API bool     ImGui_ImplCPU_Init();
IMGUI_IMPL_API void     ImGui_ImplCPU_Shutdown();
IMGUI_IMPL_API void     ImGui_ImplCPU_NewFrame();
IMGUI_IMPL_API void     ImGui_ImplCPU_RenderDrawData(ImDrawData* draw_data, ImGui_ImplCPU_Framebuffer* framebuffer);

// (Advanced) Use e.g. if you need to precisely control the timing of texture updates
// by setting ImDrawData::Textures = nullptr to handle this manually.
IMGUI_IMPL_API void     ImGui_ImplCPU_UpdateTexture(ImTextureData* tex);

#endif // #ifndef IMGUI_DISABLE