Initial commit - some engine bugs stopping compiling

third-party/glad/example/c++/multiwin_mx/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.1)
+project(glad_examples_c_multiwin_mx C CXX)
+
+find_package(glfw3 REQUIRED)
+
+set(GLAD_SOURCES_DIR "${PROJECT_SOURCE_DIR}/../../..")
+add_subdirectory("${GLAD_SOURCES_DIR}/cmake" glad_cmake)
+
+glad_add_library(glad_gl_core_mx_33 REPRODUCIBLE MX API gl:core=3.3)
+
+add_executable(multiwin_mx
+    multiwin_mx.cpp
+    )
+target_link_libraries(multiwin_mx
+    PUBLIC
+        glad_gl_core_mx_33
+        glfw
+    )

third-party/glad/example/c++/multiwin_mx/multiwin_mx.cpp

@@ -0,0 +1,109 @@
+#include <iostream>
+
+#include <glad/gl.h>
+#include <GLFW/glfw3.h>
+
+
+// Function prototypes
+GLFWwindow* create_window(const char *name, int major, int minor);
+GladGLContext* create_context(GLFWwindow *window);
+void free_context(GladGLContext *context);
+void draw(GLFWwindow *window, GladGLContext *context, float r, float g, float b);
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+
+// Window dimensions
+const GLuint WIDTH = 400, HEIGHT = 300;
+
+
+int main()
+{
+    glfwInit();
+
+    GLFWwindow *window1 = create_window("Window 1", 3, 3);
+    GLFWwindow *window2 = create_window("Window 2", 3, 2);
+
+    if (!window1 || !window2) {
+        std::cout << "Failed to create GLFW window" << std::endl;
+        glfwTerminate();
+        return -1;
+    }
+
+    glfwSetKeyCallback(window1, key_callback);
+    glfwSetKeyCallback(window2, key_callback);
+
+    GladGLContext *context1 = create_context(window1);
+    GladGLContext *context2 = create_context(window2);
+
+    if (!context1 || !context2) {
+        std::cout << "Failed to initialize GL contexts" << std::endl;
+        free_context(context1);
+        free_context(context2);
+    }
+
+    glfwMakeContextCurrent(window1);
+    context1->Viewport(0, 0, WIDTH, HEIGHT);
+
+    glfwMakeContextCurrent(window2);
+    context2->Viewport(0, 0, WIDTH, HEIGHT);
+
+
+    while (!glfwWindowShouldClose(window1) && !glfwWindowShouldClose(window2))
+    {
+        glfwPollEvents();
+
+        draw(window1, context1, 0.5, 0.2, 0.6);
+        draw(window2, context2, 0.0, 0.1, 0.8);
+    }
+
+    free_context(context1);
+    free_context(context2);
+
+    glfwTerminate();
+
+    return 0;
+}
+
+GLFWwindow* create_window(const char *name, int major, int minor) {
+    std::cout << "Creating Window, OpenGL " << major << "." << minor << ": " << name << std::endl;
+
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, major);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, minor);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, name, NULL, NULL);
+    return window;
+}
+
+GladGLContext* create_context(GLFWwindow *window) {
+    glfwMakeContextCurrent(window);
+
+    GladGLContext* context = (GladGLContext*) calloc(1, sizeof(GladGLContext));
+    if (!context) return NULL;
+
+    int version = gladLoadGLContext(context, glfwGetProcAddress);
+    std::cout << "Loaded OpenGL " << GLAD_VERSION_MAJOR(version) << "." << GLAD_VERSION_MINOR(version) << std::endl;
+
+    return context;
+}
+
+void free_context(GladGLContext *context) {
+    free(context);
+}
+
+
+void draw(GLFWwindow *window, GladGLContext *gl, float r, float g, float b) {
+    glfwMakeContextCurrent(window);
+
+    gl->ClearColor(r, g, b, 1.0f);
+    gl->Clear(GL_COLOR_BUFFER_BIT);
+
+    glfwSwapBuffers(window);
+}
+
+// Is called whenever a key is pressed/released via GLFW
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
+{
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, GL_TRUE);
+}