// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline

// - Desktop GL: 2.x 3.x 4.x

// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)

// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)

// Implemented features:

//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture as texture identifier. Read the FAQ about ImTextureID/ImTextureRef!

//  [x] Renderer: Large meshes support (64k+ vertices) even with 16-bit indices (ImGuiBackendFlags_RendererHasVtxOffset) [Desktop OpenGL only!]

//  [X] Renderer: Texture updates support for dynamic font atlas (ImGuiBackendFlags_RendererHasTextures).

//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.

// About WebGL/ES:

// - You need to '#define IMGUI_IMPL_OPENGL_ES2' or '#define IMGUI_IMPL_OPENGL_ES3' to use WebGL or OpenGL ES.

// - This is done automatically on iOS, Android and Emscripten targets.

// - For other targets, the define needs to be visible from the imgui_impl_opengl3.cpp compilation unit. If unsure, define globally or in imconfig.h.

// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.

// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.

// Learn about Dear ImGui:

// - FAQ                  https://dearimgui.com/faq

// - Getting Started      https://dearimgui.com/getting-started

// - Documentation        https://dearimgui.com/docs (same as your local docs/ folder).

// - Introduction, links and more at the top of imgui.cpp

// About GLSL version:

//  The 'glsl_version' initialization parameter should be nullptr (default) or a "#version XXX" string.

//  On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"

//  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.

#pragma once

#include "imgui.h"      // IMGUI_IMPL_API

#ifndef IMGUI_DISABLE

// Follow "Getting Started" link and check examples/ folder to learn about using backends!

IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = nullptr);

IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();

IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();

IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);

// (Optional) Called by Init/NewFrame/Shutdown

IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateDeviceObjects();

IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();

// (Advanced) Use e.g. if you need to precisely control the timing of texture updates (e.g. for staged rendering), by setting ImDrawData::Textures = nullptr to handle this manually.

IMGUI_IMPL_API void     ImGui_ImplOpenGL3_UpdateTexture(ImTextureData* tex);

// Configuration flags to add in your imconfig file:

//#define IMGUI_IMPL_OPENGL_ES2     // Enable ES 2 (Auto-detected on Emscripten)

//#define IMGUI_IMPL_OPENGL_ES3     // Enable ES 3 (Auto-detected on iOS/Android)

// You can explicitly select GLES2 or GLES3 API by using one of the '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.

#if !defined(IMGUI_IMPL_OPENGL_ES2) \

 && !defined(IMGUI_IMPL_OPENGL_ES3)

// Try to detect GLES on matching platforms

#if defined(__APPLE__)

#include <TargetConditionals.h>

#endif

#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))

#define IMGUI_IMPL_OPENGL_ES3               // iOS, Android  -> GL ES 3, "#version 300 es"

#elif defined(__EMSCRIPTEN__) || defined(__amigaos4__)

#define IMGUI_IMPL_OPENGL_ES2               // Emscripten    -> GL ES 2, "#version 100"

#else

// Otherwise imgui_impl_opengl3_loader.h will be used.

#endif

#endif

// [BETA] Selected render state data shared with callbacks.

// This is temporarily stored in GetPlatformIO().Renderer_RenderState during the ImGui_ImplOpenGL3_RenderDrawData() call.

// (Please open an issue if you feel you need access to more data)

struct ImGui_ImplOpenGL3_RenderState

{

    bool            UseBindSampler;

    bool            UseTexParameterFilter;

    unsigned int    CurrentSampler;                 // (GLuint) Used if UseBindSampler == true, otherwise always 0

    unsigned int    CurrentTexParameterFilter;      // (GLuint) Used if UseTexParameterToSetSampler == true

};

static inline ImGui_ImplOpenGL3_RenderState* ImGui_ImplOpenGL3_GetRenderState() { return (ImGui_ImplOpenGL3_RenderState*)ImGui::GetPlatformIO().Renderer_RenderState; }

#endif // #ifndef IMGUI_DISABLE