texture.c

/*
 * Final Program, CMPS 160, Fall 1999
 * Ben Gertzfield <ben@cse.ucsc.edu>
 *
 * This program is released under the GNU GPL, version 2 or later.
 */

/* Texturing routines */

#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <gtk/gtk.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glx.h>
#include <pthread.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <math.h>

#include "prog.h"
#include "rgb.h"

static GLuint textures[MAX_TEXTURES];

void gkos_init_textures(void)
{
    glGenTextures(MAX_TEXTURES, textures);
}

GLuint gkos_new_texture(gchar *filename, int dim) 
{
    RGBImageRec *texture;
    GLuint texture_id;

    texture_id = textures[0];

    texture = rgbImageLoad((char *) filename);

     if (texture == NULL || texture->data == NULL) {
	fprintf(stderr, "Error reading texture from file %s. No texture will be used.\n",
		filename);
	return 0;
    }

    if (dim == 2) {
	glBindTexture(GL_TEXTURE_2D, texture_id);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture->sizeX, texture->sizeY,
		     0, GL_RGB, GL_UNSIGNED_BYTE, texture->data);
    } else if (dim == 1) {
	glBindTexture(GL_TEXTURE_1D, texture_id);
	glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, texture->sizeX, 0, GL_RGB, GL_UNSIGNED_BYTE, texture->data);
    }

    return texture_id;
}

// Local variables:
// c-file-style:"cc-mode"
// End: