+use std;
+
+/*enum Vattr {
+ VATTR_VERTEX,
+ VATTR_TEXCOORD
+}*/
+
+static WIN_W : u32 = 800;
+static WIN_H : u32 = 600;
+
+static VERTEX_DATA : [GLfloat; 12] = [
+ -0.5, -0.5,
+ 0.5, -0.5,
+ 0.5, 0.5,
+
+ -0.5, -0.5,
+ 0.5, 0.5,
+ -0.5, 0.5
+];
+
+static NUM_VERTICES : GLint = 6;
+static VERTEX_LOC : u32 = 0;
+
+let tex : u32 = 0;
+
+static VS : &'static str =
+"#version 130\n\
+ attribute vec4 pos;\n\
+ void main() {\n\
+ gl_Position = pos;\n\
+ }";
+
+static FS : &'static str =
+"#version 130\n\
+ out vec4 color;\n\
+ void main() {\n\
+ color = vec4(0.0, 0.5, 0.8, 1.0);\n\
+ }";
+
+fn compile_sdr(src: &str, stage:GLenum) -> GLuint {
+ let shader;
+ unsafe {
+ shader = gl::CreateShader(stage);
+
+ let s = std::ffi::CString::new(src).expect("CString::new failed");;
+
+ gl::ShaderSource(shader, 1, &s.as_ptr(), std::ptr::null());
+ gl::CompileShader(shader);
+ // status
+ let mut status = gl::FALSE as GLint;
+ gl::GetShaderiv(shader, gl::COMPILE_STATUS, &mut status);
+
+ // error handling
+ if status != (gl::TRUE as GLint) {
+ let mut len = 0;
+ gl::GetShaderiv(shader, gl::INFO_LOG_LENGTH, &mut len);
+
+ let mut buf: Vec<u8> = Vec::with_capacity((len + 1) as usize);
+ buf.extend([b' '].iter().cycle().take(len as usize));
+ let err: std::ffi::CString = std::ffi::CString::from_vec_unchecked(buf);
+
+ gl::GetShaderInfoLog(shader, len, std::ptr::null_mut(),
+ err.as_ptr() as *mut GLchar);
+ println!("{}", err.to_str().unwrap());
+
+ }
+ }
+ shader
+}
+
+fn link_sdr_prog(vs: GLuint, fs: GLuint) -> GLuint {
+ unsafe {
+ let sdr_prog = gl::CreateProgram();
+ gl::AttachShader(sdr_prog, vs);
+ gl::AttachShader(sdr_prog, fs);
+ gl::LinkProgram(sdr_prog);
+
+ let mut status = gl::FALSE as GLint;
+ gl::GetProgramiv(sdr_prog, gl::LINK_STATUS, &mut status);
+ if status != (gl::TRUE as GLint) {
+ let mut len: GLint = 0;
+ gl::GetProgramiv(sdr_prog, gl::INFO_LOG_LENGTH, &mut len);
+
+
+ let mut buf: Vec<u8> = Vec::with_capacity((len + 1) as usize);
+ buf.extend([b' '].iter().cycle().take(len as usize));
+ let err: std::ffi::CString = std::ffi::CString::from_vec_unchecked(buf);
+
+ gl::GetProgramInfoLog(sdr_prog, len, std::ptr::null_mut(), err.as_ptr() as *mut GLchar);
+ println!("{}", err.to_str().unwrap());
+ }
+ sdr_prog
+ }
+}