102 lines
3.0 KiB
Plaintext
102 lines
3.0 KiB
Plaintext
#include <iostream>
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// GLEW
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#define GLEW_STATIC
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#include <GL/glew.h>
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// GLFW
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#include <GLFW/glfw3.h>
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// Other includes
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#include "shader.h"
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// Function prototypes
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
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// Window dimensions
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const GLuint WIDTH = 800, HEIGHT = 600;
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// The MAIN function, from here we start the application and run the game loop
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int main()
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{
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// Init GLFW
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glfwInit();
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// Set all the required options for GLFW
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
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// Create a GLFWwindow object that we can use for GLFW's functions
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GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
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glfwMakeContextCurrent(window);
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// Set the required callback functions
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glfwSetKeyCallback(window, key_callback);
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// Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
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glewExperimental = GL_TRUE;
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// Initialize GLEW to setup the OpenGL Function pointers
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glewInit();
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// Define the viewport dimensions
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glViewport(0, 0, WIDTH, HEIGHT);
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Shader ourShader("shader.vs", "shader.fs");
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GLfloat vertices[] = {
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// Positions // Colors
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0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, // Bottom Right
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-0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, // Bottom Left
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0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f // Top
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};
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GLuint VBO, VAO;
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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glEnableVertexAttribArray(1);
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glBindVertexArray(0);
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// Game loop
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while (!glfwWindowShouldClose(window))
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{
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glfwPollEvents();
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// Render
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// Clear the colorbuffer
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glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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// Draw the triangle
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ourShader.Use();
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glBindVertexArray(VAO);
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glDrawArrays(GL_TRIANGLES, 0, 3);
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glBindVertexArray(0);
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// Swap the screen buffers
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glfwSwapBuffers(window);
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}
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// Properly de-allocate all resources once they've outlived their purpose
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glDeleteVertexArrays(1, &VAO);
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glDeleteBuffers(1, &VBO);
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// Terminate GLFW, clearing any resources allocated by GLFW.
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glfwTerminate();
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return 0;
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}
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// Is called whenever a key is pressed/released via GLFW
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
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{
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if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
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glfwSetWindowShouldClose(window, GL_TRUE);
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}
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