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const gui = @import("gui.zig");
const backend_glfw = @import("backend_glfw.zig");
// This call will install GLFW callbacks to handle GUI interactions.
// Those callbacks will chain-call user's previously installed callbacks, if any.
// This means that custom user's callbacks need to be installed *before* calling zgpu.gui.init().
pub fn init(
window: *const anyopaque, // zglfw.Window
wgpu_device: *const anyopaque, // wgpu.Device
wgpu_swap_chain_format: u32, // wgpu.TextureFormat
wgpu_depth_format: u32, // wgpu.TextureFormat
) void {
backend_glfw.init(window);
var info = ImGui_ImplWGPU_InitInfo{
.device = wgpu_device,
.num_frames_in_flight = 1,
.rt_format = wgpu_swap_chain_format,
.depth_format = wgpu_depth_format,
.pipeline_multisample_state = .{},
};
if (!ImGui_ImplWGPU_Init(&info)) {
unreachable;
}
}
pub fn deinit() void {
ImGui_ImplWGPU_Shutdown();
backend_glfw.deinit();
}
pub fn newFrame(fb_width: u32, fb_height: u32) void {
ImGui_ImplWGPU_NewFrame();
backend_glfw.newFrame();
gui.io.setDisplaySize(@floatFromInt(fb_width), @floatFromInt(fb_height));
gui.io.setDisplayFramebufferScale(1.0, 1.0);
gui.newFrame();
}
pub fn draw(wgpu_render_pass: *const anyopaque) void {
gui.render();
ImGui_ImplWGPU_RenderDrawData(gui.getDrawData(), wgpu_render_pass);
}
pub const ImGui_ImplWGPU_InitInfo = extern struct {
device: *const anyopaque,
num_frames_in_flight: u32 = 1,
rt_format: u32,
depth_format: u32,
pipeline_multisample_state: extern struct {
next_in_chain: ?*const anyopaque = null,
count: u32 = 1,
mask: u32 = @bitCast(@as(i32, -1)),
alpha_to_coverage_enabled: bool = false,
},
};
// Those functions are defined in 'imgui_impl_wgpu.cpp`
// (they include few custom changes).
extern fn ImGui_ImplWGPU_Init(init_info: *ImGui_ImplWGPU_InitInfo) bool;
extern fn ImGui_ImplWGPU_NewFrame() void;
extern fn ImGui_ImplWGPU_RenderDrawData(draw_data: *const anyopaque, pass_encoder: *const anyopaque) void;
extern fn ImGui_ImplWGPU_Shutdown() void;
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