add imgui

src/main.cpp

@@ -1,6 +1,9 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <SDL3/SDL.h>
+#include <imgui.h>
+#include <imgui_impl_sdl3.h>
+#include <imgui_impl_sdlgpu3.h>
 
 #include "defer.h"
 #include "log.h"
@@ -781,8 +784,34 @@ int main(int argc, char **argv) {
     V2 quad_pos = { 0.101f, 0.101f };
     V2 quad_size = { 0.1f, 0.1f };
 
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO &io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+    // io.ConfigFlags |= ImGuiConfigFlags_IsSRGB;
+
+    ImGui::StyleColorsDark();
+
+    ImGui_ImplSDL3_InitForSDLGPU(window);
+    ImGui_ImplSDLGPU3_InitInfo imgui_init_info = {
+        .Device            = device,
+        .ColorTargetFormat = SDL_GetGPUSwapchainTextureFormat(device, window),
+        .MSAASamples       = SDL_GPU_SAMPLECOUNT_1,
+    };
+    ImGui_ImplSDLGPU3_Init(&imgui_init_info);
+
+    bool show_demo_window = true;
+
     // MSG Message;
     while (Running) {
+        ImGui_ImplSDLGPU3_NewFrame();
+        ImGui_ImplSDL3_NewFrame();
+        ImGui::NewFrame();
+
+        if (show_demo_window)
+            ImGui::ShowDemoWindow(&show_demo_window);
+
         SDL_GPUCommandBuffer *command_buffer = SDL_AcquireGPUCommandBuffer(device);
         if (!command_buffer) {
             log_error("Failed to acquire gpu command buffer (%s). Exiting.", SDL_GetError());
@@ -799,6 +828,8 @@ int main(int argc, char **argv) {
 
         SDL_Event event;
         while (SDL_PollEvent(&event)) {
+            ImGui_ImplSDL3_ProcessEvent(&event);
+
             switch (event.type) {
                 case SDL_EVENT_QUIT: {
                     Running = false;
@@ -810,6 +841,9 @@ int main(int argc, char **argv) {
                 } break;
 
                 case SDL_EVENT_KEY_DOWN: {
+                    if (io.WantCaptureKeyboard)
+                        continue;
+
                     if (event.key.key == SDLK_UP || event.key.key == SDLK_W) {
                         player.pos_y = clamp(0, player.pos_y - 1, map_height - 1);
                     }
@@ -836,6 +870,9 @@ int main(int argc, char **argv) {
                 } break;
 
                 case SDL_EVENT_MOUSE_BUTTON_DOWN: {
+                    if (io.WantCaptureMouse)
+                        continue;
+
                     float mouse_x = event.button.x;
                     float mouse_y = event.button.y;
 
@@ -964,8 +1001,21 @@ int main(int argc, char **argv) {
             SDL_BindGPUFragmentSamplers(render_pass, 0, texture_bindings, SDL_arraysize(texture_bindings));
             SDL_DrawGPUIndexedPrimitives(render_pass, 6, 1, 0, 0, 0);
         }
-
         SDL_EndGPURenderPass(render_pass);
+
+        ImGui::Render();
+        ImDrawData *draw_data = ImGui::GetDrawData();
+        Imgui_ImplSDLGPU3_PrepareDrawData(draw_data, command_buffer);
+
+        SDL_GPUColorTargetInfo imgui_color_target_info = {
+            .texture     = swapchain_texture,
+            .load_op     = SDL_GPU_LOADOP_LOAD,
+            .store_op    = SDL_GPU_STOREOP_STORE,
+        };
+
+        SDL_GPURenderPass *imgui_render_pass = SDL_BeginGPURenderPass(command_buffer, &imgui_color_target_info, 1, NULL);
+        ImGui_ImplSDLGPU3_RenderDrawData(draw_data, command_buffer, imgui_render_pass);
+        SDL_EndGPURenderPass(imgui_render_pass);
         
         if (!SDL_SubmitGPUCommandBuffer(command_buffer)) {
             log_error("Failed to submit gpu command buffer (%s). Exiting.", SDL_GetError());