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/// this is a port of cimgui/imgui/examples/example_glfw_opengl3/main.cpp
const c = @import("c.zig");
const std = @import("std");
const panic = std.debug.panic;
const debug_gl = @import("debug_gl.zig");
const glfw_impl = @import("glfw_impl.zig");
const gl3_impl = @import("gl3_impl.zig");
extern fn errorCallback(err: c_int, description: [*c]const u8) void {
panic("Error: {}\n", description);
}
var window: *c.GLFWwindow = undefined;
pub fn main() !void {
_ = c.glfwSetErrorCallback(errorCallback);
if (c.glfwInit() == c.GL_FALSE) {
panic("GLFW init failure\n");
}
defer c.glfwTerminate();
c.glfwWindowHint(c.GLFW_CONTEXT_VERSION_MAJOR, 3);
c.glfwWindowHint(c.GLFW_CONTEXT_VERSION_MINOR, 2);
c.glfwWindowHint(c.GLFW_OPENGL_FORWARD_COMPAT, c.GLFW_TRUE);
c.glfwWindowHint(c.GLFW_OPENGL_DEBUG_CONTEXT, debug_gl.is_on);
c.glfwWindowHint(c.GLFW_OPENGL_PROFILE, c.GLFW_OPENGL_CORE_PROFILE);
// c.glfwWindowHint(c.GLFW_DEPTH_BITS, 0);
// c.glfwWindowHint(c.GLFW_STENCIL_BITS, 8);
c.glfwWindowHint(c.GLFW_RESIZABLE, c.GL_TRUE);
const window_width = 640;
const window_height = 480;
window = c.glfwCreateWindow(window_width, window_height, c"ImGUI Test", null, null) orelse {
panic("unable to create window\n");
};
defer c.glfwDestroyWindow(window);
c.glfwMakeContextCurrent(window);
c.glfwSwapInterval(1);
const context = c.igCreateContext(null);
defer c.igDestroyContext(context);
const io = c.igGetIO();
io.*.ConfigFlags |= @enumToInt(c.ImGuiConfigFlags_NavEnableKeyboard);
io.*.ConfigFlags |= @enumToInt(c.ImGuiConfigFlags_DockingEnable);
io.*.ConfigFlags |= @enumToInt(c.ImGuiConfigFlags_ViewportsEnable);
const style = c.igGetStyle();
c.igStyleColorsDark(style);
if (io.*.ConfigFlags & @enumToInt(c.ImGuiConfigFlags_ViewportsEnable) != 0) {
style.*.WindowRounding = 0.0;
style.*.Colors[@enumToInt(c.ImGuiCol_WindowBg)].w = 1.0;
}
glfw_impl.Init(window, true, glfw_impl.ClientApi.OpenGL);
defer glfw_impl.Shutdown();
gl3_impl.Init(); // #version 150
defer gl3_impl.Shutdown();
const start_time = c.glfwGetTime();
var prev_time = start_time;
while (c.glfwWindowShouldClose(window) == c.GL_FALSE) {
c.glfwPollEvents();
try gl3_impl.NewFrame();
glfw_impl.NewFrame();
c.igNewFrame();
// main part
c.igShowDemoWindow(null);
c.igRender();
var w: c_int = undefined;
var h: c_int = undefined;
c.glfwGetFramebufferSize(window, &w, &h);
c.glViewport(0, 0, w, h);
c.glClearColor(0.0, 0.0, 0.0, 0.0);
c.glClear(c.GL_COLOR_BUFFER_BIT);
gl3_impl.RenderDrawData(c.igGetDrawData());
// const now_time = c.glfwGetTime();
// const elapsed = now_time - prev_time;
// prev_time = now_time;
// nextFrame(t, elapsed);
// draw(t, @This());
c.glfwSwapBuffers(window);
}
}
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