1.1 --- a/src/sdr.c	Tue Jun 09 18:38:33 2015 +0300
     1.2 +++ b/src/sdr.c	Wed Jun 10 06:56:27 2015 +0300
     1.3 @@ -233,10 +233,13 @@
     1.4  
     1.5  void attach_shader(unsigned int prog, unsigned int sdr)
     1.6  {
     1.7 +	int err;
     1.8 +
     1.9  	if(prog && sdr) {
    1.10 +		assert(glGetError() == GL_NO_ERROR);
    1.11  		glAttachShader(prog, sdr);
    1.12 -		if(glGetError() != GL_NO_ERROR) {
    1.13 -			fprintf(stderr, "failed to attach shader %u to program %u\n", sdr, prog);
    1.14 +		if((err = glGetError()) != GL_NO_ERROR) {
    1.15 +			fprintf(stderr, "failed to attach shader %u to program %u (err: 0x%x)\n", sdr, prog, err);
    1.16  			abort();
    1.17  		}
    1.18  	}