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#![crate_name = "glhelper"]
#![crate_type = "lib"]
extern crate gl;
use self::gl::types::{GLenum, GLint, GLuint, GLchar, GLfloat, GLsizeiptr};
use std::io::{BufReader, Read};
use std::fs::File;
use std::ptr;
use std::str;
use std::ffi::CString;
use std::mem;
pub static QUAD_DATA: [GLfloat; 20] =
[
-1., 1., 0.0, 0.0, 0.0,
1., 1., 0.0, 1.0, 0.0,
-1., -1., 0.0, 0.0, 1.0,
1., -1., 0.0, 1.0, 1.0
];
pub static mut LINE_DATA: [GLfloat; 10000] = [0.; 10000];
pub fn add_path_line(path: &[(f32, f32)], path_edges: usize, line_program: GLuint, line_vao: GLuint, line_vbo: GLuint)
{
let mut offset: usize = 0;
let stride = 16;
unsafe
{
for i in 0..path_edges
{
let normalx = path[i+1].1 - path[i].1;
let normaly = path[i].0 - path[i+1].0;
LINE_DATA[offset+0] = path[i].0;
LINE_DATA[offset+1] = path[i].1;
LINE_DATA[offset+2] = -normalx;
LINE_DATA[offset+3] = -normaly;
LINE_DATA[offset+4] = path[i].0;
LINE_DATA[offset+5] = path[i].1;
LINE_DATA[offset+6] = normalx;
LINE_DATA[offset+7] = normaly;
LINE_DATA[offset+8] = path[i+1].0;
LINE_DATA[offset+9] = path[i+1].1;
LINE_DATA[offset+10] = -normalx;
LINE_DATA[offset+11] = -normaly;
LINE_DATA[offset+12] = path[i+1].0;
LINE_DATA[offset+13] = path[i+1].1;
LINE_DATA[offset+14] = normalx;
LINE_DATA[offset+15] = normaly;
offset += stride;
}
gl::UseProgram(line_program);
gl::BindVertexArray(line_vao);
gl::BindBuffer(gl::ARRAY_BUFFER, line_vbo);
gl::BufferSubData(gl::ARRAY_BUFFER, 0, (path_edges * stride * mem::size_of::<GLfloat>()) as GLsizeiptr as isize, mem::transmute(&LINE_DATA[0]));
gl::BindBuffer(gl::ARRAY_BUFFER, 0);
gl::BindVertexArray(0);
gl::UseProgram(0);
}
}
pub fn check_gl_error(file: &'static str, line: u32)
{
unsafe
{
loop
{
let err_str: &'static str = match gl::GetError()
{
gl::NO_ERROR => { break },
gl::INVALID_OPERATION => { "INVALID_OPERATION" },
gl::INVALID_ENUM => { "INVALID_ENUM" },
gl::INVALID_VALUE => { "INVALID_VALUE" },
gl::OUT_OF_MEMORY => { "OUT_OF_MEMROY" },
gl::INVALID_FRAMEBUFFER_OPERATION => { "INVALID_FRAMEBUFFER_OPERATION" }
_ => { "" }
};
println!("GL_{}: {}, {}", err_str, file, line);
}
}
}
pub fn compile_shader(filename: &str, shader_type: GLenum) -> GLuint
{
let file = match File::open(filename) {
Ok(file) => file,
Err(..) => panic!("opening {}", filename)
};
let mut reader = BufReader::new(&file);
let src = &mut String::new();
match reader.read_to_string(src) {
Ok(_) => {},
Err(..) => panic!("reading {}", filename)
}
let shader;
unsafe {
shader = gl::CreateShader(shader_type);
let c_str = CString::new(src.as_bytes()).unwrap();
gl::ShaderSource(shader, 1, &c_str.as_ptr(), ptr::null());
gl::CompileShader(shader);
let mut status = gl::FALSE as GLint;
gl::GetShaderiv(shader, gl::COMPILE_STATUS, &mut status);
if status != (gl::TRUE as GLint) {
let mut len = 0;
gl::GetShaderiv(shader, gl::INFO_LOG_LENGTH, &mut len);
let mut buf = Vec::with_capacity(len as usize);
buf.set_len((len as usize) - 1);
gl::GetShaderInfoLog(shader, len, ptr::null_mut(), buf.as_mut_ptr() as *mut GLchar);
panic!("{}", str::from_utf8(&buf).ok().expect("ShaderInfoLog invalid UTF8"));
}
}
shader
}
pub fn link_program(vs: GLuint, fs: GLuint) -> GLuint
{
unsafe {
let program = gl::CreateProgram();
gl::AttachShader(program, vs);
gl::AttachShader(program, fs);
gl::LinkProgram(program);
let mut status = gl::FALSE as GLint;
gl::GetProgramiv(program, gl::LINK_STATUS, &mut status);
if status != (gl::TRUE as GLint) {
let mut len: GLint = 0;
gl::GetProgramiv(program, gl::INFO_LOG_LENGTH, &mut len);
let mut buf = Vec::with_capacity(len as usize);
buf.set_len((len as usize) - 1);
gl::GetProgramInfoLog(program, len, ptr::null_mut(), buf.as_mut_ptr() as *mut GLchar);
panic!("{}", str::from_utf8(&buf).ok().expect("ProgramInfoLog invalid UTF8"));
}
program
}
}
pub fn load_program(vfilename: &str, ffilename: &str, shaders: &mut Vec<GLuint>) -> GLuint
{
let vs = compile_shader(vfilename, gl::VERTEX_SHADER);
let fs = compile_shader(ffilename, gl::FRAGMENT_SHADER);
let program = link_program(vs, fs);
shaders.push(vs);
shaders.push(fs);
program
}
pub fn load_program_with_shader_outs(vfilename: &str, vout: &mut GLuint, ffilename: &str, fout: &mut GLuint) -> GLuint
{
let vs = compile_shader(vfilename, gl::VERTEX_SHADER);
let fs = compile_shader(ffilename, gl::FRAGMENT_SHADER);
let program = link_program(vs, fs);
*vout = vs;
*fout = fs;
program
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
}
}