1 files changed, 85 insertions, 0 deletions
diff --git a/core/src/Entrypoint/OpenGL3.cpp b/core/src/Entrypoint/OpenGL3.cpp
new file mode 100644
index 0000000..c1f66d5
--- /dev/null
+++ b/core/src/Entrypoint/OpenGL3.cpp
@@ -0,0 +1,85 @@
+#include "OpenGL3.hpp"
+
+#include <glad/glad.h>
+
+#include <GLFW/glfw3.h>
+#include <backend/imgui_impl_glfw.h>
+#include <backend/imgui_impl_opengl3.h>
+#include <imgui.h>
+#include <stdexcept>
+
+OpenGL3Backend::OpenGL3Backend() {
+#if IMGUI_INCLUDE_OPENGL3_BACKEND
+	glfwSetErrorCallback(GlfwErrorCallback);
+	if (!glfwInit()) {
+		throw std::runtime_error("Failed to initialize GLFW.");
+	}
+
+#	if PLATFORM_APPLE
+	// GL 3.2 + GLSL 150
+	const char* glslVersion = "#version 150";
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // 3.2+ only
+	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // Required on Mac
+#	else
+	// GL 3.0 + GLSL 130
+	const char* glslVersion = "#version 130";
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+	//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+ only
+	//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);            // 3.0+ only
+#	endif
+
+	mWindow = glfwCreateWindow(1280, 720, "Cplt", nullptr, nullptr);
+	if (mWindow == nullptr) {
+		throw std::runtime_error("Failed to create GLFW window.");
+	}
+	glfwMakeContextCurrent(mWindow);
+	glfwSwapInterval(1); // Enable vsync
+
+	if (gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) == 0) {
+		throw std::runtime_error("Failed to initialize OpenGL.");
+	}
+
+	IMGUI_CHECKVERSION();
+	ImGui::CreateContext();
+
+	ImGui_ImplGlfw_InitForOpenGL(mWindow, true);
+	ImGui_ImplOpenGL3_Init(glslVersion);
+#else
+	throw std::runtime_error("Backend opengl3 is not available in this build.\n");
+#endif
+}
+
+OpenGL3Backend::~OpenGL3Backend() {
+	ImGui_ImplOpenGL3_Shutdown();
+	ImGui_ImplGlfw_Shutdown();
+	ImGui::DestroyContext();
+
+	glfwDestroyWindow(mWindow);
+	glfwTerminate();
+}
+
+void OpenGL3Backend::BeginFrame() {
+	glfwPollEvents();
+
+	ImGui_ImplOpenGL3_NewFrame();
+	ImGui_ImplGlfw_NewFrame();
+	ImGui::NewFrame();
+}
+
+void OpenGL3Backend::EndFrame() {
+	int displayWidth, displayHeight;
+	glfwGetFramebufferSize(mWindow, &displayWidth, &displayHeight);
+	glViewport(0, 0, displayWidth, displayHeight);
+
+	const ImVec4 kClearColor = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+	glClearColor(kClearColor.x * kClearColor.w, kClearColor.y * kClearColor.w, kClearColor.z * kClearColor.w, kClearColor.w);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	ImGui::Render();
+	ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+	glfwSwapBuffers(mWindow);
+}