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use std::ffi::CString;
use crate::gl_context::GLVersion;
use crate::glx;
use crate::glx_extra;
use sparkle::gl;
use std::os::raw::*;
use crate::glx::types::{GLXContext, GLXDrawable, GLXFBConfig, GLXPixmap};
use euclid::Size2D;
use super::utils::{create_offscreen_pixmap_backed_context};
use crate::platform::NativeGLContextMethods;
pub struct NativeGLContextHandle(pub GLXContext, pub *mut glx::types::Display);
unsafe impl Send for NativeGLContextHandle {}
pub struct NativeGLContext {
native_context: GLXContext,
native_display: *mut glx::types::Display,
native_drawable: GLXDrawable,
weak: bool,
}
impl NativeGLContext {
pub fn new(share_context: Option<&GLXContext>,
api_version: GLVersion,
display: *mut glx::types::Display,
drawable: GLXDrawable,
framebuffer_config: GLXFBConfig,
extensions: String)
-> Result<NativeGLContext, &'static str> {
let shared = match share_context {
Some(ctx) => *ctx,
None => 0 as GLXContext,
};
let native = if extensions.split(' ').find(|&i| i == "GLX_ARB_create_context").is_some() {
let (major, minor) = match api_version {
GLVersion::Major(major) => { (major, 1) },
GLVersion::MajorMinor(major, minor) => { (major, minor) }
};
let attributes = [
glx_extra::CONTEXT_MAJOR_VERSION_ARB as c_int, major as c_int,
glx_extra::CONTEXT_MINOR_VERSION_ARB as c_int, minor as c_int,
0
];
let extra_functions = glx_extra::Glx::load_with(|s| {
let c_str = CString::new(s.as_bytes()).unwrap();
unsafe { glx::GetProcAddress(c_str.as_ptr() as *const u8) as *const _ }
});
unsafe {
extra_functions.CreateContextAttribsARB(display as *mut _,
framebuffer_config,
shared, 1 as glx::types::Bool,
attributes.as_ptr())
}
} else {
unsafe {
glx::CreateNewContext(display,
framebuffer_config,
glx::RGBA_TYPE as c_int,
shared,
1 as glx::types::Bool)
}
};
if native.is_null() {
unsafe { glx::DestroyPixmap(display, drawable as GLXPixmap) };
return Err("Error creating native glx context");
}
Ok(NativeGLContext {
native_context: native,
native_display: display,
native_drawable: drawable,
weak: false,
})
}
pub fn as_native_glx_context(&self) -> GLXContext {
self.native_context
}
}
impl Drop for NativeGLContext {
fn drop(&mut self) {
if !self.weak {
let _ = self.unbind();
unsafe {
glx::DestroyContext(self.native_display, self.native_context);
glx::DestroyPixmap(self.native_display, self.native_drawable as GLXPixmap);
}
}
}
}
impl NativeGLContextMethods for NativeGLContext {
type Handle = NativeGLContextHandle;
fn get_proc_address(addr: &str) -> *const () {
let addr = CString::new(addr.as_bytes()).unwrap();
let addr = addr.as_ptr();
unsafe {
glx::GetProcAddress(addr as *const _) as *const ()
}
}
fn current_handle() -> Option<Self::Handle> {
let current = unsafe { glx::GetCurrentContext() };
let dpy = unsafe { glx::GetCurrentDisplay() };
if current.is_null() || dpy.is_null() {
None
} else {
Some(NativeGLContextHandle(current, dpy))
}
}
fn current() -> Option<NativeGLContext> {
if let Some(handle) = Self::current_handle() {
unsafe {
Some(NativeGLContext {
native_context: handle.0,
native_display: handle.1,
native_drawable: glx::GetCurrentDrawable(),
weak: true,
})
}
} else {
None
}
}
fn create_shared(with: Option<&Self::Handle>,
api_type: &gl::GlType,
api_version: GLVersion) -> Result<NativeGLContext, &'static str> {
create_offscreen_pixmap_backed_context(Size2D::new(16, 16), with, api_type, api_version)
}
#[inline(always)]
fn is_current(&self) -> bool {
unsafe {
glx::GetCurrentContext() == self.native_context
}
}
fn handle(&self) -> NativeGLContextHandle {
NativeGLContextHandle(self.native_context, self.native_display)
}
fn make_current(&self) -> Result<(), &'static str> {
unsafe {
if !self.is_current() &&
glx::MakeCurrent(self.native_display,
self.native_drawable,
self.native_context) == 0 {
Err("glx::MakeCurrent")
} else {
Ok(())
}
}
}
fn unbind(&self) -> Result<(), &'static str> {
unsafe {
if self.is_current() &&
glx::MakeCurrent(self.native_display,
0 as GLXDrawable,
0 as GLXContext) == 0 {
Err("glx::MakeCurrent (on unbind)")
} else {
Ok(())
}
}
}
}