GLint num_blocks_pos = glGetUniformLocation(glsl_program_num, "num_blocks");
printf("%d err=0x%x pos=%d,%d,%d,%d\n", __LINE__, glGetError(), cum2sym_tex_pos, dsyms_tex_pos, out_tex_pos, sign_bias_pos);
GLint num_blocks_pos = glGetUniformLocation(glsl_program_num, "num_blocks");
printf("%d err=0x%x pos=%d,%d,%d,%d\n", __LINE__, glGetError(), cum2sym_tex_pos, dsyms_tex_pos, out_tex_pos, sign_bias_pos);