Add useful ImGui windows

2025-11-10 03:52:48 -05:00 · 2022-02-08 15:06:10 -05:00
parent cb9a1b2794
commit 10a49a4172
1 changed files with 165 additions and 82 deletions
--- a/main.cpp
+++ b/main.cpp
@@ -7,92 +7,117 @@

 #include "gldebug.hpp"

-void show_overlay() {
-    ImGuiWindowFlags window_flags = ImGuiWindowFlags_None
-        | ImGuiWindowFlags_NoDecoration
-        | ImGuiWindowFlags_AlwaysAutoResize
-        | ImGuiWindowFlags_NoSavedSettings
-        | ImGuiWindowFlags_NoFocusOnAppearing
-        | ImGuiWindowFlags_NoNav
-        | ImGuiWindowFlags_NoMove;
+void show_overlay(float* clear_color) {
+    static std::string gl_vendor = (const char *) glGetString(GL_VENDOR);
+    static std::string gl_renderer = (const char *) glGetString(GL_RENDERER);
+    static std::string gl_version = (const char *) glGetString(GL_VERSION);
+    static std::string glsl_version = (const char *) glGetString(GL_SHADING_LANGUAGE_VERSION);
+
+    ImGuiWindowFlags window_flags =
+        ImGuiWindowFlags_AlwaysAutoResize |
+            ImGuiWindowFlags_NoSavedSettings |
+            ImGuiWindowFlags_NoFocusOnAppearing |
+            ImGuiWindowFlags_NoNav |
+            ImGuiWindowFlags_NoBringToFrontOnFocus |
+            ImGuiWindowFlags_NoMove;
+
    ImGuiStyle &style = ImGui::GetStyle();
    const auto PAD = style.DisplaySafeAreaPadding;
-    const auto *viewport = ImGui::GetMainViewport();
-    const auto work_pos = viewport->WorkPos;
-    const auto work_size = viewport->WorkSize;
-    const auto window_pos = ImVec2(
-        work_pos.x + PAD.x,
-        work_pos.y + PAD.y
-    );
-    const auto window_pos_pivot = ImVec2(
-        0.0f,
-        0.0f
-    );
-    ImGui::SetNextWindowPos(
-        window_pos,
-        ImGuiCond_Always,
-        window_pos_pivot
-    );
+    auto window_pos = PAD;
+
+    ImGui::SetNextWindowPos(window_pos, ImGuiCond_Always);
    ImGui::SetNextWindowBgAlpha(0.35f * style.Alpha);
-    if (ImGui::Begin("Graphics Information", nullptr, window_flags)) {
-        ImGui::BeginTable("graphics", 2, ImGuiTableFlags_BordersInnerV);
-        ImGui::TableNextRow();
-        ImGui::TableNextColumn();
-        ImGui::Text("GL Vendor");
-        ImGui::TableNextColumn();
-        ImGui::Text("%s", glGetString(GL_VENDOR));
-        ImGui::TableNextRow();
-        ImGui::TableNextColumn();
-        ImGui::Text("GL Renderer");
-        ImGui::TableNextColumn();
-        ImGui::Text("%s", glGetString(GL_RENDERER));
-        ImGui::TableNextRow();
-        ImGui::TableNextColumn();
-        ImGui::Text("GL Version");
-        ImGui::TableNextColumn();
-        ImGui::Text("%s", glGetString(GL_VERSION));
-        ImGui::TableNextRow();
-        ImGui::TableNextColumn();
-        ImGui::Text("GLSL Version");
-        ImGui::TableNextColumn();
-        ImGui::Text("%s", glGetString(GL_SHADING_LANGUAGE_VERSION));
-        ImGui::EndTable();
+    ImGui::SetNextWindowCollapsed(true, ImGuiCond_Appearing);
+    ImGui::Begin("Graphics Information", nullptr, window_flags);
+    ImGui::Text("GL Vendor    | %s", gl_vendor.c_str());
+    ImGui::Text("GL Renderer  | %s", gl_renderer.c_str());
+    ImGui::Text("GL Version   | %s", gl_version.c_str());
+    ImGui::Text("GLSL Version | %s", glsl_version.c_str());
+
+    auto v2 = ImGui::GetWindowSize();
+    window_pos.y += v2.y + PAD.y;
+    ImGui::End();
+
+    ImGui::SetNextWindowPos(window_pos, ImGuiCond_Always);
+    ImGui::SetNextWindowBgAlpha(0.35f * style.Alpha);
+    ImGui::Begin("Controls", nullptr, window_flags);
+
+    ImGuiIO &io = ImGui::GetIO();
+    ImGui::Text("FPS          | %.2f", io.Framerate);
+
+    ImGui::Separator();
+
+    ImGui::ColorEdit3("Background", state.bg, ImGuiColorEditFlags_Float);
+    ImGui::SliderFloat("Alpha", &state.fg[3], 0.0f, 1.0f, "%.2f");
+
    ImGui::End();
-    }
 }

-int main() {
-    if (!glfwInit()) {
-        std::cerr << "GLFW :: failed initialization" << std::endl;
-        exit(EXIT_FAILURE);
-    }
-
-    const char *glsl_version = "#version 130";
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-    auto *window = glfwCreateWindow(1280, 720, "Hello OpenGL", nullptr, nullptr);
-    if (!window) {
-        std::cerr << "GLFW :: failed to create window" << std::endl;
-        exit(EXIT_FAILURE);
-    }
-
-    glfwMakeContextCurrent(window);
-    glfwSwapInterval(1);
-    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
-
-    IMGUI_CHECKVERSION();
-    ImGui::CreateContext();
-    ImGuiIO &io = ImGui::GetIO();
-
+void set_style() {
    ImGui::StyleColorsDark();

-    ImGui_ImplGlfw_InitForOpenGL(window, true);
-    ImGui_ImplOpenGL3_Init(glsl_version);
+    ImGuiStyle &style = ImGui::GetStyle();
+    style.WindowRounding = 4;
+    style.FrameRounding = 2;
+    style.DisplaySafeAreaPadding.x = 10;
+    style.DisplaySafeAreaPadding.y = 10;
+}

-    io.Fonts->AddFontDefault();
+int run(GLFWwindow *window, ImGuiContext *context) {
+    State state;

-    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+    float points[]{
+        +0.5f, +0.5f, 0.0f, 1.0f,
+        +0.5f, -0.5f, 0.0f, 1.0f,
+        -0.5f, +0.5f, 0.0f, 1.0f,
+        -0.5f, -0.5f, 0.0f, 1.0f,
+    };
+
+    unsigned int inds[]{
+        0, 1, 2,
+        1, 2, 3,
+    };
+
+    GLuint vao;
+    glCreateVertexArrays(1, &vao);
+
+    GLuint vbo;
+    glCreateBuffers(1, &vbo);
+
+    glNamedBufferData(vbo, sizeof(points), (void *) points, GL_STATIC_DRAW);
+    glEnableVertexArrayAttrib(vao, 0);
+    glVertexArrayVertexBuffer(vao, 0, vbo, 0, sizeof(float) * 4);
+    glVertexArrayAttribFormat(vao, 0, 4, GL_FLOAT, GL_FALSE, 0);
+
+    GLuint ibo;
+    glCreateBuffers(1, &ibo);
+    glGetError();
+    glNamedBufferData(ibo, sizeof(inds), (void *) inds, GL_STATIC_DRAW);
+    glVertexArrayElementBuffer(vao, ibo);
+
+    const char *vs_src = "#version 440\n"
+                         "layout(location=0) in vec4 pos;"
+                         "void main() {"
+                         "  gl_Position = pos;"
+                         "}";
+    GLuint vs = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vs, 1, &vs_src, nullptr);
+    glCompileShader(vs);
+
+    const char *fs_src = "#version 440\n"
+                         "layout(location=0) uniform vec4 ucol;"
+                         "layout(location=0) out vec4 col;"
+                         "void main() {"
+                         "  col = ucol;"
+                         "}";
+    GLuint fs = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fs, 1, &fs_src, nullptr);
+    glCompileShader(fs);
+
+    GLuint pgm = glCreateProgram();
+    glAttachShader(pgm, vs);
+    glAttachShader(pgm, fs);
+    glLinkProgram(pgm);

    while (!glfwWindowShouldClose(window)) {
        glfwPollEvents();
@@ -100,20 +125,78 @@ int main() {
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();
-        show_overlay();
+        show_overlay(state);
        ImGui::Render();

        int display_w, display_h;
        glfwGetFramebufferSize(window, &display_w, &display_h);
        glViewport(0, 0, display_w, display_h);
-        glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w,
-            clear_color.w);
+        glClearColor(state.bg[0], state.bg[1], state.bg[2], state.bg[3]);
        glClear(GL_COLOR_BUFFER_BIT);
-        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

+        glUseProgram(pgm);
+        glBindVertexArray(vao);
+        glUniform4fv(0, 1, state.fg);
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
+        glBindVertexArray(0);
+        glUseProgram(0);
+
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
        glfwSwapBuffers(window);
    }

+    glDeleteBuffers(1, &vbo);
+    glDeleteBuffers(1, &ibo);
+    glDeleteVertexArrays(1, &vao);
+
+    return EXIT_SUCCESS;
+}
+
+int main() {
+    if (!glfwInit()) {
+        std::cerr << "GLFW:Failed initialization" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    auto *window = glfwCreateWindow(1280, 720, "Cosets Visualization", nullptr, nullptr);
+    if (!window) {
+        std::cerr << "GLFW:Failed to create window" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(1);
+    gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
+
+#ifndef NDEBUG
+    glEnable(GL_DEBUG_OUTPUT);
+    glDebugMessageCallback(log_gl_debug_callback, nullptr);
+    glDebugMessageControl(
+        GL_DONT_CARE, GL_DEBUG_TYPE_OTHER,
+        GL_DEBUG_SEVERITY_NOTIFICATION,
+        0, nullptr, GL_FALSE
+    );
+#endif
+
+    IMGUI_CHECKVERSION();
+    auto *context = ImGui::CreateContext();
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
+    ImGui_ImplOpenGL3_Init("#version 130");
+
+    set_style();
+
+    int exit_code = EXIT_SUCCESS;
+
+    try {
+        exit_code = run(window, context);
+    } catch (const std::exception &e) {
+        std::cerr << e.what() << std::endl;
+        exit_code = EXIT_FAILURE;
+    }
+
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
@@ -121,5 +204,5 @@ int main() {
    glfwDestroyWindow(window);
    glfwTerminate();

-    exit(EXIT_SUCCESS);
+    return exit_code;
 }