From a7e5e42a188f9e6ab13706a15e6b50f36f0e00e8 Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Sun, 28 Mar 2021 15:13:05 -0700
Subject: Fix backend compiling/loading mechanism

---
 core/src/Entrypoint/OpenGL2.cpp | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

(limited to 'core/src/Entrypoint/OpenGL2.cpp')

diff --git a/core/src/Entrypoint/OpenGL2.cpp b/core/src/Entrypoint/OpenGL2.cpp
index de13a02..216399e 100644
--- a/core/src/Entrypoint/OpenGL2.cpp
+++ b/core/src/Entrypoint/OpenGL2.cpp
@@ -1,15 +1,17 @@
 #include "OpenGL2.hpp"
 
-#include <glad/glad.h>
+#if BUILD_CORE_WITH_OPENGL2_BACKEND
+#	include <glad/glad.h>
+#	include <GLFW/glfw3.h>
+#	include <backend/imgui_impl_glfw.h>
+#	include <backend/imgui_impl_opengl2.h>
+#	include <imgui.h>
+#	include <stdexcept>
 
-#include <GLFW/glfw3.h>
-#include <backend/imgui_impl_glfw.h>
-#include <backend/imgui_impl_opengl2.h>
-#include <imgui.h>
-#include <stdexcept>
+#	define IMGUI_IMPL_OPENGL_LOADER_GLAD
+#	include <backend/imgui_impl_opengl2.cpp>
 
 OpenGL2Backend::OpenGL2Backend() {
-#if IMGUI_INCLUDE_OPENGL2_BACKEND
 	glfwSetErrorCallback(GlfwErrorCallback);
 	if (!glfwInit()) {
 		throw std::runtime_error("Failed to initialize GLFW.");
@@ -31,9 +33,6 @@ OpenGL2Backend::OpenGL2Backend() {
 
 	ImGui_ImplGlfw_InitForOpenGL(mWindow, true);
 	ImGui_ImplOpenGL2_Init();
-#else
-	throw std::runtime_error("Backend opengl2 is not available in this build.\n");
-#endif
 }
 
 OpenGL2Backend::~OpenGL2Backend() {
@@ -68,3 +67,21 @@ void OpenGL2Backend::EndFrame() {
 	glfwMakeContextCurrent(mWindow);
 	glfwSwapBuffers(mWindow);
 }
+
+#else // ^^ BUILD_CORE_WITH_OPENGL2_BACKEND | !BUILD_CORE_WITH_OPENGL2_BACKEND vv
+#	include <stdexcept>
+
+OpenGL2Backend::OpenGL2Backend() {
+	throw std::runtime_error("Backend opengl2 is not available in this build.\n");
+}
+
+OpenGL2Backend::~OpenGL2Backend() {
+}
+
+void OpenGL2Backend::BeginFrame() {
+}
+
+void OpenGL2Backend::EndFrame() {
+}
+
+#endif
-- 
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