added glad generator and a glad runtime

tools/glad-0.1.14a0/example/c++/hellowindow2.cpp

@@ -0,0 +1,98 @@
+#include <iostream>
+
+
+// THIS IS OPTIONAL AND NOT REQUIRED, ONLY USE THIS IF YOU DON'T WANT GLAD TO INCLUDE windows.h
+// GLAD will include windows.h for APIENTRY if it was not previously defined.
+// Make sure you have the correct definition for APIENTRY for platforms which define _WIN32 but don't use __stdcall
+#ifdef _WIN32
+    #define APIENTRY __stdcall
+#endif
+
+// GLAD
+#include <glad/glad.h>
+#include <glad/glad_glx.h>
+
+// confirm that GLAD didn't include windows.h
+#ifdef _WINDOWS_
+    #error windows.h was included!
+#endif
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+
+// This example is taken from http://learnopengl.com/
+// http://learnopengl.com/code_viewer.php?code=getting-started/hellowindow2
+// The code originally used GLEW, I replaced it with Glad
+
+// Compile:
+// g++ example/c++/hellowindow2.cpp -Ibuild/include build/src/glad.c -lglfw -ldl
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    std::cout << "Starting GLFW context, OpenGL 3.3" << std::endl;
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", NULL, NULL);
+    glfwMakeContextCurrent(window);
+    if (window == NULL)
+    {
+        std::cout << "Failed to create GLFW window" << std::endl;
+        glfwTerminate();
+        return -1;
+    }
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+
+    if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress))
+    {
+        std::cout << "Failed to initialize OpenGL context" << std::endl;
+        return -1;
+    }
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Check if any events have been activated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+
+        // Render
+        // Clear the colorbuffer
+        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminates GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// Is called whenever a key is pressed/released via GLFW
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
+{
+    std::cout << key << std::endl;
+    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, GL_TRUE);
+}

tools/glad-0.1.14a0/example/c/simple.c

@@ -0,0 +1,87 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <glad/glad.h>
+#ifdef __APPLE__
+#include <GLUT/glut.h>
+#else
+#include <GL/glut.h>
+#endif
+
+// This file is a modified version of gl3w's test.c
+// https://github.com/skaslev/gl3w/blob/master/src/test.c
+
+// Compile:
+// gcc example/c/simple.c -Ibuild/include build/src/glad.c -lglut -ldl
+
+
+static int width = 600, height = 600;
+
+static void display(void)
+{
+    glClearColor(1.0f, 0.2f, 0.7f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glutSwapBuffers();
+    glutPostRedisplay();
+}
+
+static void reshape(int w, int h)
+{
+    width = w > 1 ? w : 1;
+    height = h > 1 ? h : 1;
+    glViewport(0, 0, width, height);
+    glClearDepth(1.0);
+    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+    glEnable(GL_DEPTH_TEST);
+}
+
+
+#ifdef GLAD_DEBUG
+void pre_gl_call(const char *name, void *funcptr, int len_args, ...) {
+    printf("Calling: %s (%d arguments)\n", name, len_args);
+}
+#endif
+
+
+int main(int argc, char **argv)
+{
+    if(gladLoadGL()) {
+        // you need an OpenGL context before loading glad
+        printf("I did load GL with no context!\n");
+        exit(-1);
+    }
+
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
+    glutInitWindowSize(width, height);
+    glutCreateWindow("cookie");
+
+    glutReshapeFunc(reshape);
+    glutDisplayFunc(display);
+
+    if(!gladLoadGL()) {
+        printf("Something went wrong!\n");
+        exit(-1);
+    }
+
+#ifdef GLAD_DEBUG
+    // before every opengl call call pre_gl_call
+    glad_set_pre_callback(pre_gl_call);
+    // don't use the callback for glClear
+    // (glClear could be replaced with your own function)
+    glad_debug_glClear = glad_glClear;
+#endif
+
+    // gladLoadGLLoader(&glutGetProcAddress);
+    printf("OpenGL %d.%d\n", GLVersion.major, GLVersion.minor);
+    if (GLVersion.major < 2) {
+        printf("Your system doesn't support OpenGL >= 2!\n");
+        return -1;
+    }
+
+    printf("OpenGL %s, GLSL %s\n", glGetString(GL_VERSION),
+           glGetString(GL_SHADING_LANGUAGE_VERSION));
+
+    glutMainLoop();
+
+    return 0;
+}