From 963fae202108acd0498349e872e4811fa6c6aba0 Mon Sep 17 00:00:00 2001
From: Nic Gaffney <gaffney_nic@protonmail.com>
Date: Wed, 12 Jun 2024 21:15:52 -0500
Subject: Added imgui for configuration

---
 vendor/zgui/src/backend_glfw_wgpu.zig | 67 +++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 vendor/zgui/src/backend_glfw_wgpu.zig

(limited to 'vendor/zgui/src/backend_glfw_wgpu.zig')

diff --git a/vendor/zgui/src/backend_glfw_wgpu.zig b/vendor/zgui/src/backend_glfw_wgpu.zig
new file mode 100644
index 0000000..e6fa517
--- /dev/null
+++ b/vendor/zgui/src/backend_glfw_wgpu.zig
@@ -0,0 +1,67 @@
+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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