nuuro 0.1.5

A specialized 2D game library
Documentation 
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// Copyright 2020-2020 Juan Villacorta
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::os::raw::c_char;
use std::{ptr, str};

use gl;
use gl::types::*;

pub fn compile_shader(src: *const c_char, ty: GLenum) -> GLuint {
    unsafe {
        let shader = gl::CreateShader(ty);

        gl::ShaderSource(shader, 1, &src, 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 - 1);
            buf.set_len(len as usize - 1); // subtract 1 to skip the trailing null character
            gl::GetShaderInfoLog(
                shader,
                len,
                ptr::null_mut(),
                buf.as_mut_ptr() as *mut GLchar,
            );
            panic!(
                "{}",
                str::from_utf8(&buf).expect("glGetShaderInfoLog returned 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 - 1);
            buf.set_len(len as usize - 1); // subtract 1 to skip the trailing null character
            gl::GetProgramInfoLog(
                program,
                len,
                ptr::null_mut(),
                buf.as_mut_ptr() as *mut GLchar,
            );
            panic!(
                "{}",
                str::from_utf8(&buf).expect("glGetProgramInfoLog returned invalid utf8")
            );
        }
        program
    }
}