/* Simplest demo of reading in an image and texture-mapping it onto the
   teapot, which defines texture coordinates for each Bezier patch.

   Scott D. Anderson
   Fall 2005
*/

#include <math.h>
#include <stdio.h>              // for printf
#include <stdlib.h>             // for exit
#include <tw.h>

char* filename = "USflag.ppm";

void texinit() {
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    twPPM_Tex2D(filename,true);
}    

void display() {
    twDisplayInit();
    twCamera();

    glPushAttrib(GL_ALL_ATTRIB_BITS);
    glEnable(GL_TEXTURE_2D);

    glutSolidTeapot(1);         // the radius of the teapot body is 1

    glPopAttrib();
    glFlush();
    glutSwapBuffers();
}

int main(int argc, char **argv) {
    if(argc >= 2) {
        filename=argv[1];
    }
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    twInitWindowSize(500, 500);
    glutCreateWindow(argv[0]);
    glutDisplayFunc(display);
    twBoundingBox(-1.5,+1.7,-0.7,+0.8,-1,+1); // still not perfect, but pretty close
    twMainInit();
    texinit();                  // load the texture from the file
    glutMainLoop();                   
}