shaders + VOA

pog.cpp

@@ -42,6 +42,75 @@ int main() {
   glGenBuffers(1, &VBO);
   glBindBuffer(GL_ARRAY_BUFFER, VBO);
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-  std::cin >> x;
+
+
+  //compiling the shaders
+  const char *vertexShaderSource =
+      "#version 330 core\n"
+      "layout (location = 0) in vec3 aPos;\n"
+      "void main()\n"
+      "{\n"
+      " gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
+      "}\0";
+  unsigned int vertexShader;
+  vertexShader = glCreateShader(GL_VERTEX_SHADER); //compile code
+
+  glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
+  glCompileShader(vertexShader);
+
+  int success;
+  char infoLog[512];
+  glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
+
+  if (!success) {
+    glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
+    std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n"
+              << infoLog << std::endl;
+  } //check if compilation succesful
+  const char *fragmentShaderSource =
+      "#version 330 core\n"
+      "layout (location = 0) in vec3 aPos;\n"
+      "void main()\n"
+      "{\n"
+      " FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);"
+      "}\0";
+
+  unsigned int fragmentShader;
+  fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+  glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
+  glCompileShader(fragmentShader); //compile fragment shader
+
+  unsigned int shaderProgram;
+  shaderProgram = glCreateProgram(); //create shader program
+
+  //attaching shaders to our program
+  glAttachShader(shaderProgram, vertexShader);
+  glAttachShader(shaderProgram, fragmentShader);
+  glLinkProgram(shaderProgram);
+
+  glUseProgram(shaderProgram); //use it NOW
+
+  //not needed anymore they're linked
+  glDeleteShader(vertexShader);
+  glDeleteShader(fragmentShader);
+
+  //tell OpenGL's stupid existence how to interpret data
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
+  glEnableVertexAttribArray(0);
+
+  // 0. copy our vertices array in a buffer for OpenGL to use
+  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+  // 1. then set the vertex attributes pointers
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
+  glEnableVertexAttribArray(0);
+  // 2. use our shader program when we want to render an object
+  glUseProgram(shaderProgram);
+  // 3. now draw the object
+
+  unsigned int VAO;
+  glGenVertexArrays(1, &VAO);
+
+  glfwTerminate();
   return 0;
 }