Texturing

The texture functions are experimental and only implemented in the OpenGL driver for now, in a somehow hardware dependent way. So do not use them if you are interested in images with a higher than screen resolution.

void texture_init (unsigned char *, unsigned int, int, int)
This is used to define a texture by dev->texture_init (&Image[0][0][0], G_RGB, imageWidth, imageHeight); here Image is a matrix of size imagewidth*imageheight*3: unsigned char Image[imagewidth][imageheight][3]; the integers imagewidth, imageheight are the width and the height of the image. Notice that imagewidth, imageheight are numbers of the form  and the smallest number is 64. For better use take imagewidth = imageheight.

void texture_coord (double, double)
This function has to be called during patch generation, i.e. between subsequent calls of patch_vertex(). After defining a texture with void (*texture_init) you can define a point in texture space  with dev->texture_coord(xp,yp); here xp, yp are double values between 0.0 and 1.0. Then you define a point in your image space  with dev->patch_vertex(pkt); here pkt is of type VEC3.