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use CreationError;
use CreationError::OsError;
use BuilderAttribs;
use libc;
use std::ptr;
use core_foundation::base::TCFType;
use core_foundation::string::CFString;
use core_foundation::bundle::{CFBundleGetBundleWithIdentifier, CFBundleGetFunctionPointerForName};
use cocoa::base::{id, nil};
use cocoa::appkit::*;
mod gl {
generate_gl_bindings! {
api: "gl",
profile: "core",
version: "3.2",
generator: "global",
extensions: ["GL_EXT_framebuffer_object"],
}
}
static mut framebuffer: u32 = 0;
static mut texture: u32 = 0;
pub struct HeadlessContext {
width: usize,
height: usize,
context: id,
}
impl HeadlessContext {
pub fn new(builder: BuilderAttribs) -> Result<HeadlessContext, CreationError> {
let (width, height) = builder.dimensions;
let context = unsafe {
let attributes = [
NSOpenGLPFADoubleBuffer as usize,
NSOpenGLPFAClosestPolicy as usize,
NSOpenGLPFAColorSize as usize, 24,
NSOpenGLPFAAlphaSize as usize, 8,
NSOpenGLPFADepthSize as usize, 24,
NSOpenGLPFAStencilSize as usize, 8,
NSOpenGLPFAOffScreen as usize,
0
];
let pixelformat = NSOpenGLPixelFormat::alloc(nil).initWithAttributes_(&attributes);
if pixelformat == nil {
return Err(OsError(format!("Could not create the pixel format")));
}
let context = NSOpenGLContext::alloc(nil).initWithFormat_shareContext_(pixelformat, nil);
if context == nil {
return Err(OsError(format!("Could not create the rendering context")));
}
context
};
let headless = HeadlessContext {
width: width,
height: height,
context: context,
};
// Load the function pointers as we need them to create the FBO
gl::load_with(|s| headless.get_proc_address(s) as *const libc::c_void);
Ok(headless)
}
pub unsafe fn make_current(&self) {
self.context.makeCurrentContext();
gl::GenFramebuffersEXT(1, &mut framebuffer);
gl::BindFramebufferEXT(gl::FRAMEBUFFER_EXT, framebuffer);
gl::GenTextures(1, &mut texture);
gl::BindTexture(gl::TEXTURE_2D, texture);
gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::LINEAR as i32);
gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR as i32);
gl::TexImage2D(gl::TEXTURE_2D, 0, gl::RGBA8 as i32, self.width as i32, self.height as i32,
0, gl::RGBA, gl::UNSIGNED_BYTE, ptr::null());
gl::FramebufferTexture2DEXT(gl::FRAMEBUFFER_EXT, gl::COLOR_ATTACHMENT0_EXT,
gl::TEXTURE_2D, texture, 0);
let status = gl::CheckFramebufferStatusEXT(gl::FRAMEBUFFER_EXT);
if status != gl::FRAMEBUFFER_COMPLETE_EXT {
panic!("Error while creating the framebuffer");
}
}
pub fn get_proc_address(&self, _addr: &str) -> *const () {
let symbol_name: CFString = from_str(_addr).unwrap();
let framework_name: CFString = from_str("com.apple.opengl").unwrap();
let framework = unsafe {
CFBundleGetBundleWithIdentifier(framework_name.as_concrete_TypeRef())
};
let symbol = unsafe {
CFBundleGetFunctionPointerForName(framework, symbol_name.as_concrete_TypeRef())
};
symbol as *const ()
}
}
unsafe impl Send for HeadlessContext {}
unsafe impl Sync for HeadlessContext {}
impl Drop for HeadlessContext {
fn drop(&mut self) {
unsafe {
gl::DeleteTextures(1, &texture);
gl::DeleteFramebuffersEXT(1, &framebuffer);
}
}
}
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