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|
use ContextError;
use CreationError;
use CreationError::OsError;
use GlAttributes;
use GlContext;
use PixelFormatRequirements;
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::*;
use PixelFormat;
mod gl {
include!(concat!(env!("OUT_DIR"), "/gl_bindings.rs"));
}
static mut framebuffer: u32 = 0;
static mut texture: u32 = 0;
pub struct HeadlessContext {
width: u32,
height: u32,
context: id,
}
impl HeadlessContext {
pub fn new((width, height): (u32, u32), _pf_reqs: &PixelFormatRequirements,
_opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
{
let context = unsafe {
let attributes = [
NSOpenGLPFAAccelerated as u32,
NSOpenGLPFAAllowOfflineRenderers as u32,
NSOpenGLPFADoubleBuffer as u32,
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)
}
}
impl GlContext for HeadlessContext {
unsafe fn make_current(&self) -> Result<(), ContextError> {
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");
}
Ok(())
}
#[inline]
fn is_current(&self) -> bool {
unimplemented!()
}
#[inline]
fn get_proc_address(&self, _addr: &str) -> *const libc::c_void {
let symbol_name: CFString = _addr.parse().unwrap();
let framework_name: CFString = "com.apple.opengl".parse().unwrap();
let framework = unsafe {
CFBundleGetBundleWithIdentifier(framework_name.as_concrete_TypeRef())
};
let symbol = unsafe {
CFBundleGetFunctionPointerForName(framework, symbol_name.as_concrete_TypeRef())
};
symbol as *const libc::c_void
}
#[inline]
fn swap_buffers(&self) -> Result<(), ContextError> {
Ok(())
}
#[inline]
fn get_api(&self) -> ::Api {
::Api::OpenGl
}
#[inline]
fn get_pixel_format(&self) -> PixelFormat {
unimplemented!();
}
}
unsafe impl Send for HeadlessContext {}
unsafe impl Sync for HeadlessContext {}
impl Drop for HeadlessContext {
#[inline]
fn drop(&mut self) {
unsafe {
gl::DeleteTextures(1, &texture);
gl::DeleteFramebuffersEXT(1, &framebuffer);
}
}
}
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