initial commit

src/main.cpp

@@ -0,0 +1,80 @@
+#include <iostream>
+
+#include "glad/gl.h"
+#include "GLFW/glfw3.h"
+
+#include "spdlog/spdlog.h"
+
+GLFWwindow* gWindow;
+int gWindowWidth = 800;
+int gWindowHeight = 600;
+
+int glVersionMajor;
+int glVersionMinor;
+
+void glfw_error_callback(int error, const char* description);
+void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
+void glfw_framebuffer_size_callback(GLFWwindow* window, int width, int height);
+
+int main() {
+    spdlog::info("b_engine start");
+
+    if (!glfwInit()) {
+        spdlog::error("could not initialize glfw");
+        std::exit(1);
+    }
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+    glfwSetErrorCallback(glfw_error_callback);
+
+    gWindow = glfwCreateWindow(gWindowWidth, gWindowHeight, "b_engine v0.0.1", nullptr, nullptr);
+    if (!gWindow) {
+        spdlog::error("failed to create glfw window");
+        std::exit(1);
+    }
+
+    glfwMakeContextCurrent(gWindow);
+
+    glfwSetKeyCallback(gWindow, glfw_key_callback);
+    glfwSetFramebufferSizeCallback(gWindow, glfw_framebuffer_size_callback);
+
+    int version = gladLoadGL(glfwGetProcAddress);
+    glVersionMajor = GLAD_VERSION_MAJOR(version);
+    glVersionMinor = GLAD_VERSION_MINOR(version);
+    spdlog::info("gl version {}.{}", glVersionMajor, glVersionMinor);
+
+    int fbWidth, fbHeight;
+    glfwGetFramebufferSize(gWindow, &fbWidth, &fbHeight);
+    glViewport(0, 0, fbWidth, fbHeight);
+
+    while (!glfwWindowShouldClose(gWindow)) {
+        glfwPollEvents();
+
+        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        glfwSwapBuffers(gWindow);
+    }
+
+    glfwDestroyWindow(gWindow);
+    glfwTerminate();
+
+    return 0;
+}
+
+void glfw_error_callback(int error, const char* description) {
+    spdlog::error("glfw error: {}", description);
+}
+
+void glfw_key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
+        glfwSetWindowShouldClose(window, GL_TRUE);
+    }
+}
+
+void glfw_framebuffer_size_callback(GLFWwindow *window, int width, int height) {
+    glViewport(0, 0, width, height);
+}