the mentioned attachment: sample file which segfaults as described

segfault.c (text/plain), 1.10 KB, created by Brandon Mintern on 2007-03-11 21:02:53 UTC

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

unsigned char *some_texture (int width, int height) {
	unsigned char *buffer;
	int y;
	width = 256;
	height = 256;
	buffer = (unsigned char*) malloc(width * height * 3);
	for (y = height-1; y>=0; y--) {
		unsigned int x;
		for (x=0; x<width; x++) {
			unsigned int pos;
			pos = width*y+x*3;
			/* Just create a solid green buffer */
			buffer[pos] = 0;
			buffer[pos+1] = 255;
			buffer[pos+2] = 0;
		}
	}
	return buffer;
}

/******************************************************************************/

int main () {
	unsigned char *buffer;
	int width, height;
	width = 256;
	height = 256;
	GLuint texture;
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	buffer = some_texture(width, height);
	/* Segfault on this command) */
	gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, width, height,
	                  GL_RGB, GL_UNSIGNED_BYTE, buffer);
	free(buffer);
	return texture;
}