1 files changed, 44 insertions, 0 deletions
diff --git a/vendor/zgui/src/backend_glfw_opengl.zig b/vendor/zgui/src/backend_glfw_opengl.zig
new file mode 100644
index 0000000..cb94dc3
--- /dev/null
+++ b/vendor/zgui/src/backend_glfw_opengl.zig
@@ -0,0 +1,44 @@
+const gui = @import("gui.zig");
+const backend_glfw = @import("backend_glfw.zig");
+
+pub fn initWithGlSlVersion(
+    window: *const anyopaque, // zglfw.Window
+    glsl_version: ?[:0]const u8, // e.g. "#version 130"
+) void {
+    backend_glfw.initOpenGL(window);
+
+    ImGui_ImplOpenGL3_Init(@ptrCast(glsl_version));
+}
+
+pub fn init(
+    window: *const anyopaque, // zglfw.Window
+) void {
+    initWithGlSlVersion(window, null);
+}
+
+pub fn deinit() void {
+    ImGui_ImplOpenGL3_Shutdown();
+    backend_glfw.deinit();
+}
+
+pub fn newFrame(fb_width: u32, fb_height: u32) void {
+    backend_glfw.newFrame();
+    ImGui_ImplOpenGL3_NewFrame();
+
+    gui.io.setDisplaySize(@as(f32, @floatFromInt(fb_width)), @as(f32, @floatFromInt(fb_height)));
+    gui.io.setDisplayFramebufferScale(1.0, 1.0);
+
+    gui.newFrame();
+}
+
+pub fn draw() void {
+    gui.render();
+    ImGui_ImplOpenGL3_RenderDrawData(gui.getDrawData());
+}
+
+// Those functions are defined in 'imgui_impl_opengl3.cpp`
+// (they include few custom changes).
+extern fn ImGui_ImplOpenGL3_Init(glsl_version: [*c]const u8) void;
+extern fn ImGui_ImplOpenGL3_Shutdown() void;
+extern fn ImGui_ImplOpenGL3_NewFrame() void;
+extern fn ImGui_ImplOpenGL3_RenderDrawData(data: *const anyopaque) void;