add shader stuff

src/main.cpp

@@ -3,6 +3,9 @@
  * window in OpenGL.
  */
 
+#include "classes/ElementBufferObject.h"
+#include "classes/VertexArrayObject.h"
+#include "classes/VertexBufferObject.h"
 #include "glad/glad.h"
 #include "GLFW/glfw3.h"
 #include "classes/Classes.h"
@@ -15,6 +18,18 @@ void processInput(GLFWwindow *window);
 const unsigned int WINDOW_WIDTH = 800;
 const unsigned int WINDOW_HEIGHT = 600;
 
+float vertices[] = {
+     1.0f,  1.0f, 0.0f,  // top right
+     1.0f, -1.0f, 0.0f,  // bottom right
+    -1.0f, -1.0f, 0.0f,  // bottom left
+    -1.0f,  1.0f, 0.0f   // top left 
+};
+
+unsigned int indices[] = {
+    0, 1, 3, // first Triangle
+    1, 2, 3  // second Triangle
+};
+
 int main(void) {
     // Initialisation and configuration.
     glfwInit();
@@ -23,7 +38,8 @@ int main(void) {
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 
     // Create window.
-    GLFWwindow *window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Learn Shaders", NULL, NULL);
+    GLFWwindow *window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT,
+                                          "Learn Shaders", NULL, NULL);
     if (window == NULL) {
         LogInfo("Failed to create GLFW window.");
         glfwTerminate();
@@ -37,17 +53,38 @@ int main(void) {
         return -1;
     }
 
+    // Shader stuff. 
+    Shader shader("../src/shaders/vertexShader.vert.glsl", "../src/shaders/fragmentShader.frag.glsl");
+
+    VertexArrayObject VAO;
+    VAO.Bind();
+    VertexBufferObject VBO(vertices, sizeof(vertices));
+    VBO.Bind();
+    ElementBufferObject EBO(indices, sizeof(indices));
+    EBO.Bind();
+
+    VAO.LinkVBO(VBO, 0);
+
+    // while loop goes here.
     while (!glfwWindowShouldClose(window)) {
         processInput(window);
-
         glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
         glClear(GL_COLOR_BUFFER_BIT);
 
+        shader.Activate();
+        VAO.Bind();
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
         glfwSwapBuffers(window);
         glfwPollEvents();
     }
     
+    VAO.Delete();
+    VBO.Delete();
+    EBO.Delete();
+    shader.Delete();
     glfwDestroyWindow(window);
+
     glfwTerminate();
     return 0;
 }

src/shaders/fragmentShader.frag.glsl

@@ -0,0 +1,7 @@
+#version 330 core 
+
+out vec4 FragColour;
+
+void main() {
+    FragColour = vec4(1.0f, 0.0f, 1.0f, 1.0f);
+}

src/shaders/vertexShader.vert.glsl

@@ -0,0 +1,7 @@
+#version 330 core 
+
+layout(location = 0) in vec3 aPos;
+
+void main() {
+    gl_Position = vec4(aPos, 1.0);
+}