mirror of
https://github.com/Drezil/imgui.git
synced 2024-11-23 12:27:01 +00:00
272 lines
9.6 KiB
C++
272 lines
9.6 KiB
C++
// 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 GLuint g_FontTexture = 0;
|
|
|
|
// 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);
|
|
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context
|
|
|
|
// 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();
|
|
const ImDrawIdx* idx_buffer = (const unsigned short*)&cmd_list->idx_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)));
|
|
|
|
for (size_t cmd_i = 0; cmd_i < cmd_list->commands.size(); cmd_i++)
|
|
{
|
|
const ImDrawCmd* pcmd = &cmd_list->commands[cmd_i];
|
|
if (pcmd->user_callback)
|
|
{
|
|
pcmd->user_callback(cmd_list, pcmd);
|
|
}
|
|
else
|
|
{
|
|
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));
|
|
glDrawElements(GL_TRIANGLES, pcmd->idx_count, GL_UNSIGNED_SHORT, idx_buffer);
|
|
}
|
|
idx_buffer += pcmd->idx_count;
|
|
}
|
|
}
|
|
#undef OFFSETOF
|
|
|
|
// Restore modified state
|
|
glDisableClientState(GL_COLOR_ARRAY);
|
|
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
|
|
glDisableClientState(GL_VERTEX_ARRAY);
|
|
glBindTexture(GL_TEXTURE_2D, 0);
|
|
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*, int button, int action, int /*mods*/)
|
|
{
|
|
if (action == GLFW_PRESS && button >= 0 && button < 3)
|
|
g_MousePressed[button] = true;
|
|
}
|
|
|
|
void ImGui_ImplGlfw_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
|
|
{
|
|
g_MouseWheel += (float)yoffset; // Use fractional mouse wheel, 1.0 unit 5 lines.
|
|
}
|
|
|
|
void ImGui_ImplGlFw_KeyCallback(GLFWwindow*, int key, int, int action, int mods)
|
|
{
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
if (action == GLFW_PRESS)
|
|
io.KeysDown[key] = true;
|
|
if (action == GLFW_RELEASE)
|
|
io.KeysDown[key] = false;
|
|
|
|
(void)mods; // Modifiers are not reliable across systems
|
|
io.KeyCtrl = io.KeysDown[GLFW_KEY_LEFT_CONTROL] || io.KeysDown[GLFW_KEY_RIGHT_CONTROL];
|
|
io.KeyShift = io.KeysDown[GLFW_KEY_LEFT_SHIFT] || io.KeysDown[GLFW_KEY_RIGHT_SHIFT];
|
|
io.KeyAlt = io.KeysDown[GLFW_KEY_LEFT_ALT] || io.KeysDown[GLFW_KEY_RIGHT_ALT];
|
|
}
|
|
|
|
void ImGui_ImplGlfw_CharCallback(GLFWwindow*, unsigned int c)
|
|
{
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
if (c > 0 && c < 0x10000)
|
|
io.AddInputCharacter((unsigned short)c);
|
|
}
|
|
|
|
bool ImGui_ImplGlfw_CreateDeviceObjects()
|
|
{
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
|
|
// Build texture
|
|
unsigned char* pixels;
|
|
int width, height;
|
|
io.Fonts->GetTexDataAsAlpha8(&pixels, &width, &height);
|
|
|
|
// Create texture
|
|
glGenTextures(1, &g_FontTexture);
|
|
glBindTexture(GL_TEXTURE_2D, g_FontTexture);
|
|
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)g_FontTexture;
|
|
|
|
// Cleanup (don't clear the input data if you want to append new fonts later)
|
|
io.Fonts->ClearInputData();
|
|
io.Fonts->ClearTexData();
|
|
|
|
return true;
|
|
}
|
|
|
|
void ImGui_ImplGlfw_InvalidateDeviceObjects()
|
|
{
|
|
if (g_FontTexture)
|
|
{
|
|
glDeleteTextures(1, &g_FontTexture);
|
|
ImGui::GetIO().Fonts->TexID = 0;
|
|
g_FontTexture = 0;
|
|
}
|
|
}
|
|
|
|
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()
|
|
{
|
|
ImGui_ImplGlfw_InvalidateDeviceObjects();
|
|
ImGui::Shutdown();
|
|
}
|
|
|
|
void ImGui_ImplGlfw_NewFrame()
|
|
{
|
|
if (!g_FontTexture)
|
|
ImGui_ImplGlfw_CreateDeviceObjects();
|
|
|
|
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())
|
|
if (glfwGetWindowAttrib(g_Window, GLFW_FOCUSED))
|
|
{
|
|
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.)
|
|
}
|
|
else
|
|
{
|
|
io.MousePos = ImVec2(-1,-1);
|
|
}
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
{
|
|
io.MouseDown[i] = g_MousePressed[i] || glfwGetMouseButton(g_Window, i) != 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.
|
|
g_MousePressed[i] = false;
|
|
}
|
|
|
|
io.MouseWheel = g_MouseWheel;
|
|
g_MouseWheel = 0.0f;
|
|
|
|
// Hide OS mouse cursor if ImGui is drawing it
|
|
glfwSetInputMode(g_Window, GLFW_CURSOR, io.MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL);
|
|
|
|
// Start the frame
|
|
ImGui::NewFrame();
|
|
}
|