Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
#include <GLFW/glfw3.h>
#include <stdlib.h>
#include <stdio.h>
static void error_callback(int error, const char* description)
{
fputs(description, stderr);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
int main(void)
{
GLFWwindow* window;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(512, 512, "Simple example", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
glfwSetKeyCallback(window, key_callback);
int width, height;
glfwGetFramebufferSize(window, &width, &height);
glEnable(GL_TEXTURE_2D);
int texture[1];
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]); // 2d texture (x and y size)
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // scale linearly when image bigger than texture
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // scale linearly when image smalled than texture
// 2d texture, level of detail 0 (normal), 3 components (red, green, blue), x size from image, y size from image,
// border 0 (normal), rgb color data, unsigned byte data, and finally the data itself.
glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
while (!glfwWindowShouldClose(window))
{
float ratio;
ratio = width / (float) height;
glViewport(0, 0, width, height);
glClear(GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-ratio, ratio, -1.f, 1.f, 1.f, -1.f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotatef(0.f, 0.f, 0.f, 1.f);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glBegin(GL_QUADS);
glColor3f(1.f, 0.f, 0.f);
glVertex3f(-1.f, -1.f, 0.f);
glColor3f(0.f, 1.f, 0.f);
glVertex3f(-1.f, 1.f, 0.f);
glColor3f(0.f, 0.f, 1.f);
glVertex3f(1.f, 1.f, 0.f);
glColor3f(0.f, 0.f, 1.f);
glVertex3f(1.f, -1.f, 0.f);
glEnd();
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_SUCCESS);
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment