| // ImGui GLFW binding with OpenGL |
| // https://github.com/ocornut/imgui |
| |
| #include <imgui.h> |
| #include "imgui_impl_glfw.h" |
| |
| // GLFW |
| #include <GLFW/glfw3.h> |
| #ifdef _MSC_VER |
| #undef APIENTRY |
| #define GLFW_EXPOSE_NATIVE_WIN32 |
| #define GLFW_EXPOSE_NATIVE_WGL |
| #include <GLFW/glfw3native.h> |
| #endif |
| |
| // Data |
| static GLFWwindow* g_Window = NULL; |
| static double g_Time = 0.0f; |
| static bool g_MousePressed[3] = { false, false, false }; |
| static float g_MouseWheel = 0.0f; |
| static bool g_FontTextureLoaded = false; |
| |
| // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) |
| // If text or lines are blurry when integrating ImGui in your engine: |
| // - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) |
| static void ImGui_ImplGlfw_RenderDrawLists(ImDrawList** const cmd_lists, int cmd_lists_count) |
| { |
| if (cmd_lists_count == 0) |
| return; |
| |
| // We are using the OpenGL fixed pipeline to make the example code simpler to read! |
| // A probable faster way to render would be to collate all vertices from all cmd_lists into a single vertex buffer. |
| // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers. |
| glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT); |
| glEnable(GL_BLEND); |
| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| glDisable(GL_CULL_FACE); |
| glDisable(GL_DEPTH_TEST); |
| glEnable(GL_SCISSOR_TEST); |
| glEnableClientState(GL_VERTEX_ARRAY); |
| glEnableClientState(GL_TEXTURE_COORD_ARRAY); |
| glEnableClientState(GL_COLOR_ARRAY); |
| glEnable(GL_TEXTURE_2D); |
| |
| // Setup orthographic projection matrix |
| const float width = ImGui::GetIO().DisplaySize.x; |
| const float height = ImGui::GetIO().DisplaySize.y; |
| glMatrixMode(GL_PROJECTION); |
| glPushMatrix(); |
| glLoadIdentity(); |
| glOrtho(0.0f, width, height, 0.0f, -1.0f, +1.0f); |
| glMatrixMode(GL_MODELVIEW); |
| glPushMatrix(); |
| glLoadIdentity(); |
| |
| // Render command lists |
| #define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT)) |
| for (int n = 0; n < cmd_lists_count; n++) |
| { |
| const ImDrawList* cmd_list = cmd_lists[n]; |
| const unsigned char* vtx_buffer = (const unsigned char*)&cmd_list->vtx_buffer.front(); |
| glVertexPointer(2, GL_FLOAT, sizeof(ImDrawVert), (void*)(vtx_buffer + OFFSETOF(ImDrawVert, pos))); |
| glTexCoordPointer(2, GL_FLOAT, sizeof(ImDrawVert), (void*)(vtx_buffer + OFFSETOF(ImDrawVert, uv))); |
| glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ImDrawVert), (void*)(vtx_buffer + OFFSETOF(ImDrawVert, col))); |
| |
| int vtx_offset = 0; |
| for (size_t cmd_i = 0; cmd_i < cmd_list->commands.size(); cmd_i++) |
| { |
| const ImDrawCmd* pcmd = &cmd_list->commands[cmd_i]; |
| glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->texture_id); |
| glScissor((int)pcmd->clip_rect.x, (int)(height - pcmd->clip_rect.w), (int)(pcmd->clip_rect.z - pcmd->clip_rect.x), (int)(pcmd->clip_rect.w - pcmd->clip_rect.y)); |
| glDrawArrays(GL_TRIANGLES, vtx_offset, pcmd->vtx_count); |
| vtx_offset += pcmd->vtx_count; |
| } |
| } |
| #undef OFFSETOF |
| |
| // Restore modified state |
| glDisableClientState(GL_COLOR_ARRAY); |
| glDisableClientState(GL_TEXTURE_COORD_ARRAY); |
| glDisableClientState(GL_VERTEX_ARRAY); |
| glMatrixMode(GL_MODELVIEW); |
| glPopMatrix(); |
| glMatrixMode(GL_PROJECTION); |
| glPopMatrix(); |
| glPopAttrib(); |
| } |
| |
| static const char* ImGui_ImplGlfw_GetClipboardText() |
| { |
| return glfwGetClipboardString(g_Window); |
| } |
| |
| static void ImGui_ImplGlfw_SetClipboardText(const char* text) |
| { |
| glfwSetClipboardString(g_Window, text); |
| } |
| |
| void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods) |
| { |
| if (action == GLFW_PRESS && button >= 0 && button < 3) |
| g_MousePressed[button] = true; |
| } |
| |
| void ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset) |
| { |
| g_MouseWheel += (float)yoffset; // Use fractional mouse wheel, 1.0 unit 5 lines. |
| } |
| |
| void ImGui_ImplGlFw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| if (action == GLFW_PRESS) |
| io.KeysDown[key] = true; |
| if (action == GLFW_RELEASE) |
| io.KeysDown[key] = false; |
| io.KeyCtrl = (mods & GLFW_MOD_CONTROL) != 0; |
| io.KeyShift = (mods & GLFW_MOD_SHIFT) != 0; |
| } |
| |
| void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| if (c > 0 && c < 0x10000) |
| io.AddInputCharacter((unsigned short)c); |
| } |
| |
| void ImGui_ImplGlfw_InitFontsTexture() |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| |
| unsigned char* pixels; |
| int width, height; |
| io.Fonts->GetTexDataAsAlpha8(&pixels, &width, &height); |
| |
| GLuint tex_id; |
| glGenTextures(1, &tex_id); |
| glBindTexture(GL_TEXTURE_2D, tex_id); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, pixels); |
| |
| // Store our identifier |
| io.Fonts->TexID = (void *)(intptr_t)tex_id; |
| |
| g_FontTextureLoaded = true; |
| } |
| |
| bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks) |
| { |
| g_Window = window; |
| |
| ImGuiIO& io = ImGui::GetIO(); |
| io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array. |
| io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT; |
| io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT; |
| io.KeyMap[ImGuiKey_UpArrow] = GLFW_KEY_UP; |
| io.KeyMap[ImGuiKey_DownArrow] = GLFW_KEY_DOWN; |
| io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME; |
| io.KeyMap[ImGuiKey_End] = GLFW_KEY_END; |
| io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE; |
| io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE; |
| io.KeyMap[ImGuiKey_Enter] = GLFW_KEY_ENTER; |
| io.KeyMap[ImGuiKey_Escape] = GLFW_KEY_ESCAPE; |
| io.KeyMap[ImGuiKey_A] = GLFW_KEY_A; |
| io.KeyMap[ImGuiKey_C] = GLFW_KEY_C; |
| io.KeyMap[ImGuiKey_V] = GLFW_KEY_V; |
| io.KeyMap[ImGuiKey_X] = GLFW_KEY_X; |
| io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y; |
| io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z; |
| |
| io.RenderDrawListsFn = ImGui_ImplGlfw_RenderDrawLists; |
| io.SetClipboardTextFn = ImGui_ImplGlfw_SetClipboardText; |
| io.GetClipboardTextFn = ImGui_ImplGlfw_GetClipboardText; |
| #ifdef _MSC_VER |
| io.ImeWindowHandle = glfwGetWin32Window(g_Window); |
| #endif |
| |
| if (install_callbacks) |
| { |
| glfwSetMouseButtonCallback(window, ImGui_ImplGlfw_MouseButtonCallback); |
| glfwSetScrollCallback(window, ImGui_ImplGlfw_ScrollCallback); |
| glfwSetKeyCallback(window, ImGui_ImplGlFw_KeyCallback); |
| glfwSetCharCallback(window, ImGui_ImplGlfw_CharCallback); |
| } |
| |
| return true; |
| } |
| |
| void ImGui_ImplGlfw_Shutdown() |
| { |
| if (GLuint tex_id = (GLuint)(intptr_t)ImGui::GetIO().Fonts->TexID) |
| { |
| glDeleteTextures(1, &tex_id); |
| ImGui::GetIO().Fonts->TexID = 0; |
| } |
| ImGui::Shutdown(); |
| } |
| |
| void ImGui_ImplGlfw_NewFrame() |
| { |
| if (!g_FontTextureLoaded) |
| ImGui_ImplGlfw_InitFontsTexture(); |
| |
| ImGuiIO& io = ImGui::GetIO(); |
| |
| // Setup display size (every frame to accommodate for window resizing) |
| int w, h; |
| int display_w, display_h; |
| glfwGetWindowSize(g_Window, &w, &h); |
| glfwGetFramebufferSize(g_Window, &display_w, &display_h); |
| io.DisplaySize = ImVec2((float)display_w, (float)display_h); |
| |
| // Setup time step |
| double current_time = glfwGetTime(); |
| io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f/60.0f); |
| g_Time = current_time; |
| |
| // Setup inputs |
| // (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents()) |
| double mouse_x, mouse_y; |
| glfwGetCursorPos(g_Window, &mouse_x, &mouse_y); |
| mouse_x *= (float)display_w / w; // Convert mouse coordinates to pixels |
| mouse_y *= (float)display_h / h; |
| io.MousePos = ImVec2((float)mouse_x, (float)mouse_y); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.) |
| |
| io.MouseDown[0] = g_MousePressed[0] || glfwGetMouseButton(g_Window, GLFW_MOUSE_BUTTON_LEFT) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame. |
| io.MouseDown[1] = g_MousePressed[1] || glfwGetMouseButton(g_Window, GLFW_MOUSE_BUTTON_RIGHT) != 0; |
| io.MouseDown[2] = g_MousePressed[2] || glfwGetMouseButton(g_Window, GLFW_MOUSE_BUTTON_MIDDLE) != 0; |
| g_MousePressed[0] = false; |
| g_MousePressed[1] = false; |
| g_MousePressed[2] = false; |
| |
| io.MouseWheel = g_MouseWheel; |
| g_MouseWheel = 0.0f; |
| |
| // Start the frame |
| ImGui::NewFrame(); |
| } |