zgui/src/backend_glfw_opengl3.zig

const zgui = @import("gui.zig");

pub fn init(window: *anyopaque, glsl_version: []const u8) void {
    if (!ImGui_ImplGlfw_InitForOpenGL(window, true)) unreachable;
    if (!ImGui_ImplOpenGL3_Init(glsl_version.ptr)) unreachable;
}

pub fn deinit() void {
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
}

pub fn newFrame(width: f32, height: f32) void {
    ImGui_ImplOpenGL3_NewFrame();
    ImGui_ImplGlfw_NewFrame();

    zgui.io.setDisplaySize(width, height);
    zgui.io.setDisplayFramebufferScale(1.0, 1.0);

    zgui.newFrame();
}

pub fn draw() void {
    zgui.render();
    ImGui_ImplOpenGL3_RenderDrawData(zgui.getDrawData());
}

extern fn ImGui_ImplGlfw_InitForOpenGL(window: *anyopaque, install_callbacks: bool) bool;
extern fn ImGui_ImplGlfw_Shutdown() void;
extern fn ImGui_ImplGlfw_NewFrame() void;

extern fn ImGui_ImplOpenGL3_Init(glsl_version: [*]const u8) bool;
extern fn ImGui_ImplOpenGL3_Shutdown() void;
extern fn ImGui_ImplOpenGL3_NewFrame() void;
extern fn ImGui_ImplOpenGL3_RenderDrawData(draw_data: *anyopaque) void; // ImDrawData