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

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This commit is contained in:
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();
}

1
examples/imgui_impl_opengl2.h
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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**

8
examples/opengl2_example/main.cpp
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@ -30,6 +30,8 @@ int main(int, char**)
// Setup ImGui binding
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO(); (void)io;
io.ConfigFlags |= ImGuiConfigFlags_EnableViewports;
io.ConfigFlags |= ImGuiConfigFlags_NoTaskBarForViewports;
//io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
ImGui_ImplGlfw_InitForOpenGL(window, true);
ImGui_ImplOpenGL2_Init();
@ -114,6 +116,12 @@ int main(int, char**)
glClear(GL_COLOR_BUFFER_BIT);
//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context where shaders may be bound, but prefer using the GL3+ code.
ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
// Update and Render additional Platform Windows (when ImGuiConfigFlags_EnableViewports is enabled)
ImGui::UpdatePlatformWindows();
ImGui::RenderPlatformWindows(NULL, NULL);
glfwMakeContextCurrent(window);
glfwSwapBuffers(window);
}

2
imgui.cpp
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@ -14066,7 +14066,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
ImGui::BulletText("Pos: (%.0f,%.0f), PlatformPos: (%.0f,%.0f)", viewport->Pos.x, viewport->Pos.y, viewport->PlatformPos.x, viewport->PlatformPos.y);
if (i > 0) { ImGui::SameLine(); if (ImGui::SmallButton("Reset")) viewport->PlatformPos = ImVec2(0, 0); }
ImGui::BulletText("DpiScale: %.0f%%", viewport->DpiScale * 100.0f);
ImGui::BulletText("Flags: 0x%04X =%s%s%s%s", viewport->Flags,
ImGui::BulletText("Flags: 0x%04X =%s%s%s%s%s", viewport->Flags,
(flags & ImGuiViewportFlags_CanHostOtherWindows) ? " CanHostOtherWindows" : "", (flags & ImGuiViewportFlags_NoDecoration) ? " NoDecoration" : "",
(flags & ImGuiViewportFlags_NoFocusOnAppearing) ? " NoFocusOnAppearing" : "", (flags & ImGuiViewportFlags_NoInputs) ? " NoInputs" : "",
(flags & ImGuiViewportFlags_NoRendererClear) ? " NoRendererClear" : "");