use crate::{Context, Object};
use glib::translate::*;
use std::{fmt, ptr};
glib_wrapper! {
pub struct GLES2Context(Object<ffi::CoglGLES2Context, GLES2ContextClass>) @extends Object;
match fn {
get_type => || ffi::cogl_gles2_context_get_gtype(),
}
}
impl GLES2Context {
/// Allocates a new OpenGLES 2.0 context that can be used to render to
/// `CoglOffscreen` framebuffers (Rendering to `Onscreen`
/// framebuffers is not currently supported).
///
/// To actually access the OpenGLES 2.0 api itself you need to use
/// `GLES2Context::get_vtable`. You should not try to directly link
/// to and use the symbols provided by the a system OpenGLES 2.0
/// driver.
///
/// Once you have allocated an OpenGLES 2.0 context you can make it
/// current using `cogl_push_gles2_context`. For those familiar with
/// using the EGL api, this serves a similar purpose to eglMakeCurrent.
///
/// `<note>`Before using this api applications can check for OpenGLES 2.0
/// api support by checking for `FeatureID::OglFeatureIdGles2Context` support
/// with `cogl_has_feature`. This function will return `false` and
/// return an `GLES2ContextError::Unsupported` error if the
/// feature isn't available.`</note>`
///
/// ## `ctx`
/// A `Context`
///
/// # Returns
///
/// A newly allocated `GLES2Context` or `None` if there
/// was an error and `error` will be updated in that case.
pub fn new(ctx: &Context) -> Result<GLES2Context, glib::Error> {
unsafe {
let mut error = ptr::null_mut();
let ret = ffi::cogl_gles2_context_new(ctx.to_glib_none().0, &mut error);
if error.is_null() {
Ok(from_glib_full(ret))
} else {
Err(from_glib_full(error))
}
}
}
// /// Queries the OpenGLES 2.0 api function pointers that should be
// /// used for rendering with the given `self`.
// ///
// /// `<note>`You should not try to directly link to and use the symbols
// /// provided by any system OpenGLES 2.0 driver.`</note>`
// ///
// ///
// /// # Returns
// ///
// /// A pointer to a `GLES2Vtable` providing pointers
// /// to functions for the full OpenGLES 2.0 api.
// pub fn get_vtable(&self) -> Option<GLES2Vtable> {
// unsafe {
// from_glib_none(ffi::cogl_gles2_context_get_vtable(
// self.to_glib_none().0,
// ))
// }
// }
}
impl fmt::Display for GLES2Context {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "GLES2Context")
}
}