Texture

#include <GL/glut.h>
#include <SDL_Image.h>

void drawScene();
void handleResize(int w,int h);

GLuint TextureID;

SDL_Surface *Image = IMG_Load("cb.png");

void initRendering() {
    glDisable(GL_DEPTH_TEST);
    glGetError();
    glEnable(GL_NORMALIZE);
    glGetError();
    glEnable(GL_COLOR_MATERIAL);
    glGetError();
    glEnable(GL_TEXTURE_2D);
    glGetError();
    glEnable(GL_BLEND);
    glMatrixMode(GL_PROJECTION);
    glGetError();
    glLoadIdentity();
    glGetError();

    glClearColor(0,0,0,1);
    glGetError();
}

void Texture(SDL_Surface *Surface)
{
    glGenTextures(1, &TextureID);
    glGetError();
    glBindTexture(GL_TEXTURE_2D, TextureID);
    glGetError();

    GLint Mode = GL_RGB;

    if(Surface->format->BytesPerPixel == 4) {
        Mode = GL_RGBA;
    }

    glGetError();
    glGetError();

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glGetError();
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glGetError();

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    glTexImage2D(GL_TEXTURE_2D, 0, Mode, Surface->w, Surface->h, 0, Mode, GL_UNSIGNED_BYTE, Surface->pixels);
}

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(400, 400);

    glutCreateWindow("Textures - SLD & OpenGL");
    initRendering();
    Texture(Image);

    glutDisplayFunc(drawScene);
    //glutKeyboardFunc(handleKeypress);
    glutReshapeFunc(handleResize);

    glutMainLoop();
    return 0;
}

void handleResize(int w,int h)
{
    glViewport (0, 0, (GLsizei) w, (GLsizei) h);
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D (0, (GLdouble) w, 0, (GLdouble) h);
}

void drawScene() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glGetError();

    glMatrixMode(GL_MODELVIEW);
    glGetError();
    glLoadIdentity();
    glGetError();


    // For Ortho mode, of course
    int X = 150;
    int Y = 150;
    int Width = 100;
    int Height = 100;

    glBegin(GL_QUADS);
        glColor3f(1,1,1);
        glTexCoord2f(0, 0); glVertex3f(X, Y, 0);
        glTexCoord2f(1, 0); glVertex3f(X + Width, Y, 0);
        glTexCoord2f(1, 1); glVertex3f(X + Width, Y + Height, 0);
        glTexCoord2f(0, 1); glVertex3f(X, Y + Height, 0);
    glEnd();

    glutSwapBuffers();
}