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Examples: OpenGL2: Added multi-viewport support in the OpenGL2 back-end. (#1542) + Metrics: Fix undisplayed flag.

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omar
2018-03-20 22:18:18 +01:00
parent 172570acae
commit 42ad3c1dd3
4 changed files with 48 additions and 1 deletions
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38
examples/imgui_impl_opengl2.cpp
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@ -3,6 +3,7 @@
// Implemented features:
// [X] User texture binding. Use 'GLUint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
// [X] Multi-viewport rendering (when ImGuiConfigFlags_EnableViewports is enabled).
// **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
// **Prefer using the code in imgui_impl_opengl3.cpp**
@ -14,6 +15,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2018-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
// 2018-XX-XX: OpenGL: Offset projection matrix and clipping rectangle by draw_data->DisplayPos (which will be non-zero for multi-viewport applications).
// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplGlfwGL2_RenderDrawData() in the .h file so you can call it yourself.
// 2017-09-01: OpenGL: Save and restore current polygon mode.
@ -39,14 +41,24 @@
// OpenGL Data
static GLuint g_FontTexture = 0;
// Forward Declarations
static void ImGui_ImplOpenGL2_InitPlatformInterface();
static void ImGui_ImplOpenGL2_ShutdownPlatformInterface();
// Functions
bool ImGui_ImplOpenGL2_Init()
{
// Setup back-end capabilities flags
ImGuiIO& io = ImGui::GetIO();
io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports; // We can create multi-viewports on the Renderer side (optional)
if (io.ConfigFlags & ImGuiConfigFlags_EnableViewports)
ImGui_ImplOpenGL2_InitPlatformInterface();
return true;
}
void ImGui_ImplOpenGL2_Shutdown()
{
ImGui_ImplOpenGL2_ShutdownPlatformInterface();
ImGui_ImplOpenGL2_DestroyDeviceObjects();
}
@ -197,3 +209,29 @@ void ImGui_ImplOpenGL2_DestroyDeviceObjects()
{
ImGui_ImplOpenGL2_DestroyFontsTexture();
}
//--------------------------------------------------------------------------------------------------------
// Platform Interface (Optional, for multi-viewport support)
//--------------------------------------------------------------------------------------------------------
static void ImGui_ImplOpenGL2_RenderWindow(ImGuiViewport* viewport, void*)
{
if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
{
ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
}
ImGui_ImplOpenGL2_RenderDrawData(viewport->DrawData);
}
static void ImGui_ImplOpenGL2_InitPlatformInterface()
{
ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
platform_io.Renderer_RenderWindow = ImGui_ImplOpenGL2_RenderWindow;
}
static void ImGui_ImplOpenGL2_ShutdownPlatformInterface()
{
ImGui::DestroyPlatformWindows();
}