mirror of
https://github.com/Drezil/imgui.git
synced 2024-12-29 19:16:35 +00:00
365 lines
16 KiB
C++
365 lines
16 KiB
C++
// ImGui GLFW binding with OpenGL (legacy, fixed pipeline)
|
|
// (GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
|
|
|
|
// Implemented features:
|
|
// [X] User texture binding. Cast 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
|
|
|
|
// **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
|
|
// **Prefer using the code in the opengl3_example/ folder**
|
|
// This code is mostly provided as a reference to learn how ImGui integration works, because it is shorter to read.
|
|
// If your code is using GL3+ context or any semi modern OpenGL calls, using this is likely to make everything more
|
|
// complicated, will require your code to reset every single OpenGL attributes to their initial state, and might
|
|
// confuse your GPU driver.
|
|
// The GL2 code is unable to reset attributes or even call e.g. "glUseProgram(0)" because they don't exist in that API.
|
|
|
|
// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
|
|
// If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
|
|
// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
|
|
// https://github.com/ocornut/imgui
|
|
|
|
// CHANGELOG
|
|
// (minor and older changes stripped away, please see git history for details)
|
|
// 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors and ImGuiBackendFlags_HasSetMousePos flags + honor ImGuiConfigFlags_NoMouseCursorChange flag.
|
|
// 2018-02-20: Inputs: Added support for mouse cursors (ImGui::GetMouseCursor() value, passed to glfwSetCursor()).
|
|
// 2018-02-20: Inputs: Renamed GLFW callbacks exposed in .h to not include GL2 in their name.
|
|
// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplGlfwGL2_RenderDrawData() in the .h file so you can call it yourself.
|
|
// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
|
|
// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
|
|
// 2018-02-06: Inputs: Honoring the io.WantSetMousePos flag by repositioning the mouse (ImGuiConfigFlags_NavEnableSetMousePos is set).
|
|
// 2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
|
|
// 2018-01-18: Inputs: Added mapping for ImGuiKey_Insert.
|
|
// 2018-01-09: Misc: Renamed imgui_impl_glfw.* to imgui_impl_glfw_gl2.*.
|
|
// 2017-09-01: OpenGL: Save and restore current polygon mode.
|
|
// 2017-08-25: Inputs: MousePos set to -FLT_MAX,-FLT_MAX when mouse is unavailable/missing (instead of -1,-1).
|
|
// 2016-10-15: Misc: Added a void* user_data parameter to Clipboard function handlers.
|
|
// 2016-09-10: OpenGL: Uploading font texture as RGBA32 to increase compatibility with users shaders (not ideal).
|
|
// 2016-09-05: OpenGL: Fixed save and restore of current scissor rectangle.
|
|
|
|
#include "imgui.h"
|
|
#include "imgui_impl_glfw_gl2.h"
|
|
|
|
// GLFW
|
|
#include <GLFW/glfw3.h>
|
|
#ifdef _WIN32
|
|
#undef APIENTRY
|
|
#define GLFW_EXPOSE_NATIVE_WIN32
|
|
#define GLFW_EXPOSE_NATIVE_WGL
|
|
#include <GLFW/glfw3native.h>
|
|
#endif
|
|
|
|
// GLFW data
|
|
static GLFWwindow* g_Window = NULL;
|
|
static double g_Time = 0.0f;
|
|
static bool g_MouseJustPressed[3] = { false, false, false };
|
|
static GLFWcursor* g_MouseCursors[ImGuiMouseCursor_COUNT] = { 0 };
|
|
|
|
// OpenGL data
|
|
static GLuint g_FontTexture = 0;
|
|
|
|
// OpenGL2 Render function.
|
|
// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
|
|
// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so.
|
|
void ImGui_ImplGlfwGL2_RenderDrawData(ImDrawData* draw_data)
|
|
{
|
|
// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
int fb_width = (int)(io.DisplaySize.x * io.DisplayFramebufferScale.x);
|
|
int fb_height = (int)(io.DisplaySize.y * io.DisplayFramebufferScale.y);
|
|
if (fb_width == 0 || fb_height == 0)
|
|
return;
|
|
draw_data->ScaleClipRects(io.DisplayFramebufferScale);
|
|
|
|
// We are using the OpenGL fixed pipeline to make the example code simpler to read!
|
|
// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers, polygon fill.
|
|
GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
|
|
GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
|
|
GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
|
|
GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
|
|
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);
|
|
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
|
|
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound
|
|
|
|
// Setup viewport, orthographic projection matrix
|
|
glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
|
|
glMatrixMode(GL_PROJECTION);
|
|
glPushMatrix();
|
|
glLoadIdentity();
|
|
glOrtho(0.0f, io.DisplaySize.x, io.DisplaySize.y, 0.0f, -1.0f, +1.0f);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glPushMatrix();
|
|
glLoadIdentity();
|
|
|
|
// Render command lists
|
|
for (int n = 0; n < draw_data->CmdListsCount; n++)
|
|
{
|
|
const ImDrawList* cmd_list = draw_data->CmdLists[n];
|
|
const ImDrawVert* vtx_buffer = cmd_list->VtxBuffer.Data;
|
|
const ImDrawIdx* idx_buffer = cmd_list->IdxBuffer.Data;
|
|
glVertexPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, pos)));
|
|
glTexCoordPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, uv)));
|
|
glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, col)));
|
|
|
|
for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
|
|
{
|
|
const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
|
|
if (pcmd->UserCallback)
|
|
{
|
|
pcmd->UserCallback(cmd_list, pcmd);
|
|
}
|
|
else
|
|
{
|
|
glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
|
|
glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y));
|
|
glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer);
|
|
}
|
|
idx_buffer += pcmd->ElemCount;
|
|
}
|
|
}
|
|
|
|
// Restore modified state
|
|
glDisableClientState(GL_COLOR_ARRAY);
|
|
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
|
|
glDisableClientState(GL_VERTEX_ARRAY);
|
|
glBindTexture(GL_TEXTURE_2D, (GLuint)last_texture);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glPopMatrix();
|
|
glMatrixMode(GL_PROJECTION);
|
|
glPopMatrix();
|
|
glPopAttrib();
|
|
glPolygonMode(GL_FRONT, (GLenum)last_polygon_mode[0]); glPolygonMode(GL_BACK, (GLenum)last_polygon_mode[1]);
|
|
glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
|
|
glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
|
|
}
|
|
|
|
static const char* ImGui_ImplGlfwGL2_GetClipboardText(void* user_data)
|
|
{
|
|
return glfwGetClipboardString((GLFWwindow*)user_data);
|
|
}
|
|
|
|
static void ImGui_ImplGlfwGL2_SetClipboardText(void* user_data, const char* text)
|
|
{
|
|
glfwSetClipboardString((GLFWwindow*)user_data, text);
|
|
}
|
|
|
|
void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow*, int button, int action, int /*mods*/)
|
|
{
|
|
if (action == GLFW_PRESS && button >= 0 && button < 3)
|
|
g_MouseJustPressed[button] = true;
|
|
}
|
|
|
|
void ImGui_ImplGlfw_ScrollCallback(GLFWwindow*, double xoffset, double yoffset)
|
|
{
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
io.MouseWheelH += (float)xoffset;
|
|
io.MouseWheel += (float)yoffset;
|
|
}
|
|
|
|
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];
|
|
io.KeySuper = io.KeysDown[GLFW_KEY_LEFT_SUPER] || io.KeysDown[GLFW_KEY_RIGHT_SUPER];
|
|
}
|
|
|
|
void ImGui_ImplGlfw_CharCallback(GLFWwindow*, unsigned int c)
|
|
{
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
if (c > 0 && c < 0x10000)
|
|
io.AddInputCharacter((unsigned short)c);
|
|
}
|
|
|
|
bool ImGui_ImplGlfwGL2_CreateDeviceObjects()
|
|
{
|
|
// Build texture atlas
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
unsigned char* pixels;
|
|
int width, height;
|
|
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
|
|
|
|
// Upload texture to graphics system
|
|
GLint last_texture;
|
|
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_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);
|
|
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
|
|
|
// Store our identifier
|
|
io.Fonts->TexID = (void *)(intptr_t)g_FontTexture;
|
|
|
|
// Restore state
|
|
glBindTexture(GL_TEXTURE_2D, last_texture);
|
|
|
|
return true;
|
|
}
|
|
|
|
void ImGui_ImplGlfwGL2_InvalidateDeviceObjects()
|
|
{
|
|
if (g_FontTexture)
|
|
{
|
|
glDeleteTextures(1, &g_FontTexture);
|
|
ImGui::GetIO().Fonts->TexID = 0;
|
|
g_FontTexture = 0;
|
|
}
|
|
}
|
|
|
|
static void ImGui_ImplGlfw_InstallCallbacks(GLFWwindow* window)
|
|
{
|
|
glfwSetMouseButtonCallback(window, ImGui_ImplGlfw_MouseButtonCallback);
|
|
glfwSetScrollCallback(window, ImGui_ImplGlfw_ScrollCallback);
|
|
glfwSetKeyCallback(window, ImGui_ImplGlfw_KeyCallback);
|
|
glfwSetCharCallback(window, ImGui_ImplGlfw_CharCallback);
|
|
}
|
|
|
|
bool ImGui_ImplGlfwGL2_Init(GLFWwindow* window, bool install_callbacks)
|
|
{
|
|
g_Window = window;
|
|
|
|
// Setup back-end capabilities flags
|
|
ImGuiIO& io = ImGui::GetIO();
|
|
io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
|
|
io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
|
|
|
|
// Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array.
|
|
io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;
|
|
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_PageUp] = GLFW_KEY_PAGE_UP;
|
|
io.KeyMap[ImGuiKey_PageDown] = GLFW_KEY_PAGE_DOWN;
|
|
io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME;
|
|
io.KeyMap[ImGuiKey_End] = GLFW_KEY_END;
|
|
io.KeyMap[ImGuiKey_Insert] = GLFW_KEY_INSERT;
|
|
io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE;
|
|
io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE;
|
|
io.KeyMap[ImGuiKey_Space] = GLFW_KEY_SPACE;
|
|
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.SetClipboardTextFn = ImGui_ImplGlfwGL2_SetClipboardText;
|
|
io.GetClipboardTextFn = ImGui_ImplGlfwGL2_GetClipboardText;
|
|
io.ClipboardUserData = g_Window;
|
|
#ifdef _WIN32
|
|
io.ImeWindowHandle = glfwGetWin32Window(g_Window);
|
|
#endif
|
|
|
|
// Load cursors
|
|
// FIXME: GLFW doesn't expose suitable cursors for ResizeAll, ResizeNESW, ResizeNWSE. We revert to arrow cursor for those.
|
|
g_MouseCursors[ImGuiMouseCursor_Arrow] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
|
|
g_MouseCursors[ImGuiMouseCursor_TextInput] = glfwCreateStandardCursor(GLFW_IBEAM_CURSOR);
|
|
g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
|
|
g_MouseCursors[ImGuiMouseCursor_ResizeNS] = glfwCreateStandardCursor(GLFW_VRESIZE_CURSOR);
|
|
g_MouseCursors[ImGuiMouseCursor_ResizeEW] = glfwCreateStandardCursor(GLFW_HRESIZE_CURSOR);
|
|
g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
|
|
g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
|
|
|
|
if (install_callbacks)
|
|
ImGui_ImplGlfw_InstallCallbacks(window);
|
|
|
|
return true;
|
|
}
|
|
|
|
void ImGui_ImplGlfwGL2_Shutdown()
|
|
{
|
|
// Destroy GLFW mouse cursors
|
|
for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
|
|
glfwDestroyCursor(g_MouseCursors[cursor_n]);
|
|
memset(g_MouseCursors, 0, sizeof(g_MouseCursors));
|
|
|
|
// Destroy OpenGL objects
|
|
ImGui_ImplGlfwGL2_InvalidateDeviceObjects();
|
|
}
|
|
|
|
void ImGui_ImplGlfwGL2_NewFrame()
|
|
{
|
|
if (!g_FontTexture)
|
|
ImGui_ImplGlfwGL2_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)w, (float)h);
|
|
io.DisplayFramebufferScale = ImVec2(w > 0 ? ((float)display_w / w) : 0, h > 0 ? ((float)display_h / h) : 0);
|
|
|
|
// 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))
|
|
{
|
|
// Set OS mouse position if requested (only used when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
|
|
if (io.WantSetMousePos)
|
|
{
|
|
glfwSetCursorPos(g_Window, (double)io.MousePos.x, (double)io.MousePos.y);
|
|
}
|
|
else
|
|
{
|
|
double mouse_x, mouse_y;
|
|
glfwGetCursorPos(g_Window, &mouse_x, &mouse_y);
|
|
io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
io.MousePos = ImVec2(-FLT_MAX,-FLT_MAX);
|
|
}
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
{
|
|
// 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[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;
|
|
g_MouseJustPressed[i] = false;
|
|
}
|
|
|
|
// Update OS/hardware mouse cursor if imgui isn't drawing a software cursor
|
|
if ((io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) == 0 && glfwGetInputMode(g_Window, GLFW_CURSOR) != GLFW_CURSOR_DISABLED)
|
|
{
|
|
ImGuiMouseCursor cursor = ImGui::GetMouseCursor();
|
|
if (io.MouseDrawCursor || cursor == ImGuiMouseCursor_None)
|
|
{
|
|
glfwSetInputMode(g_Window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
|
|
}
|
|
else
|
|
{
|
|
glfwSetCursor(g_Window, g_MouseCursors[cursor] ? g_MouseCursors[cursor] : g_MouseCursors[ImGuiMouseCursor_Arrow]);
|
|
glfwSetInputMode(g_Window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
|
|
}
|
|
}
|
|
|
|
// Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application.
|
|
ImGui::NewFrame();
|
|
}
|