LearnOpenGL tutorial. Made it up to Shaders

.gitignore

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+lib/
+build/

Makefile

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+CC = g++
+CFLAGS = -std=c++17 -O2
+LDFLAGS = -lglfw3 -lGL -ldl -lpthread -lX11 -lXxf86vm -lXrandr -lXi
+OUT_NAME = LearnOpenGL
+
+build: src/main.cpp 
+	mkdir -p build/
+	$(CC) $(CFLAGS) -Ilib/GLAD/include -Ilib/glfw/include -o build/$(OUT_NAME) lib/GLAD/src/glad.c src/main.cpp $(LDFLAGS)
+
+
+run: build/$(OUT_NAME)
+	./build/$(OUT_NAME)

src/main.cpp

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+#include <stdio.h>
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+
+void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
+   glViewport(0,0, width, height);
+}
+
+void processInput( GLFWwindow* window){
+   if(glfwGetKey(window,GLFW_KEY_ESCAPE) == GLFW_PRESS)
+      glfwSetWindowShouldClose(window, true);
+
+}
+
+int main() {
+   printf("Hello OpenGL!");
+   glfwInit();
+   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
+   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+
+   GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
+   if( window == NULL){
+      printf("Failed to create GLFW window!");
+      glfwTerminate();
+      return -1; 
+   }
+   glfwMakeContextCurrent(window);
+
+   if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){
+      printf("Failed to initialize GLAD!");
+      return -1;
+   }
+
+   glViewport(0,0, 800, 600);
+   glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+
+   glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+
+   // TODO: Load from disk 
+   const char* vertextShaderSource = 
+      "#version 460 core\n"
+      "layout (location=0) in vec3 aPos;\n"
+      "void main(){\n"
+      "gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
+      "}\n";
+
+   unsigned int vertexShader;
+   vertexShader = glCreateShader(GL_VERTEX_SHADER);
+   glShaderSource(vertexShader, 1, &vertextShaderSource, NULL);
+   glCompileShader(vertexShader);
+
+   int success;
+   char infolog[512];
+   glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
+
+   if(!success){
+      glGetShaderInfoLog(vertexShader, 512, NULL, infolog);
+      printf ( "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n %s", infolog);
+
+   }
+
+
+   //TODO: load from disk
+   const char* fragmentShaderSource = 
+      "#version 330 core\n"
+      "out vec4 FragColor;\n"
+      "void main(){\n"
+      "FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
+      "}\n";
+
+   unsigned int fragmentShader;
+   fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+   glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
+   glCompileShader(fragmentShader);
+
+   glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
+
+   if(!success){
+      glGetShaderInfoLog(fragmentShader, 512 ,NULL,infolog);
+      printf("ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n %s", infolog);
+   }
+
+
+
+   unsigned int shaderProgram;
+   shaderProgram = glCreateProgram();
+
+   glAttachShader(shaderProgram, vertexShader);
+   glAttachShader(shaderProgram, fragmentShader);
+   glLinkProgram(shaderProgram);
+
+   glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
+   if(!success) {
+      glGetProgramInfoLog(shaderProgram, 512, NULL, infolog);
+      printf("ERROR::SHADER_PROGRAM::LINKING_FAILED\n %s", infolog);
+   }
+
+
+   glDeleteShader(vertexShader);
+   glDeleteShader(fragmentShader);
+
+
+
+
+   float vertices[] = {
+      0.5f, 0.5f, 0.0f, // top, right
+      0.5f, -0.5f, 0.0f, // bottom right
+      -0.5f, -0.5f, 0.0f, // bottom left
+      -0.5f, 0.5f, 0.0f // top left
+   };
+
+   unsigned int indices[] = {
+         0, 1,3, // first triangle
+         1,2,3 // second triangle
+   };
+
+   // Vertex buffer objects!!
+   unsigned int VBO, VAO, EBO;
+   glGenVertexArrays(1, &VAO);
+   glGenBuffers(1, &VBO);
+   glGenBuffers(1, &EBO);
+
+   glBindVertexArray(VAO);
+
+   glBindBuffer(GL_ARRAY_BUFFER, VBO);
+   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+   glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+
+   glVertexAttribPointer(0,3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+   glEnableVertexAttribArray(0);
+
+   glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+   glBindVertexArray(0);
+
+   // WireFrame mode
+   // glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
+
+   while(!glfwWindowShouldClose(window))
+   {
+      processInput(window);
+
+      glClear(GL_COLOR_BUFFER_BIT);
+
+      glUseProgram(shaderProgram);
+      glBindVertexArray(VAO);
+      glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+      glDrawElements(GL_TRIANGLES, 6,GL_UNSIGNED_INT,  0);
+      glBindVertexArray(0);
+
+      glfwSwapBuffers(window);
+      glfwPollEvents();
+   }
+
+   glDeleteVertexArrays(1, &VAO);
+   glDeleteBuffers(1, &VBO);
+   glDeleteProgram(shaderProgram);
+
+   glfwTerminate();
+
+   return 0;
+
+
+}

src/vertex.shader

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+#version 460 core
+layout (location=0) in vec3 aPos;
+
+void main(){
+    gl_Position = vec4(aPos.x, aPos.y, aPos.z 1.0);
+
+}