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-rw-r--r--src/api/egl/mod.rs164
1 files changed, 130 insertions, 34 deletions
diff --git a/src/api/egl/mod.rs b/src/api/egl/mod.rs
index a54fb77..f6757ac 100644
--- a/src/api/egl/mod.rs
+++ b/src/api/egl/mod.rs
@@ -16,6 +16,22 @@ use std::{mem, ptr};
pub mod ffi;
+/// Specifies the type of display passed as `native_display`.
+pub enum NativeDisplay {
+ /// `None` means `EGL_DEFAULT_DISPLAY`.
+ X11(Option<ffi::EGLNativeDisplayType>),
+ /// `None` means `EGL_DEFAULT_DISPLAY`.
+ Gbm(Option<ffi::EGLNativeDisplayType>),
+ /// `None` means `EGL_DEFAULT_DISPLAY`.
+ Wayland(Option<ffi::EGLNativeDisplayType>),
+ /// `EGL_DEFAULT_DISPLAY` is mandatory for Android.
+ Android,
+ // TODO: should be `EGLDeviceEXT`
+ Device(ffi::EGLNativeDisplayType),
+ /// Don't specify any display type. Useful on windows. `None` means `EGL_DEFAULT_DISPLAY`.
+ Other(Option<ffi::EGLNativeDisplayType>),
+}
+
pub struct Context {
egl: ffi::egl::Egl,
display: ffi::egl::types::EGLDisplay,
@@ -32,21 +48,96 @@ impl Context {
///
/// To finish the process, you must call `.finish(window)` on the `ContextPrototype`.
pub fn new<'a>(egl: ffi::egl::Egl, builder: &'a BuilderAttribs<'a>,
- native_display: Option<ffi::EGLNativeDisplayType>)
+ native_display: NativeDisplay)
-> Result<ContextPrototype<'a>, CreationError>
{
if builder.sharing.is_some() {
unimplemented!()
}
- let display = unsafe {
- let display = egl.GetDisplay(native_display.unwrap_or(mem::transmute(ffi::egl::DEFAULT_DISPLAY)));
- if display.is_null() {
- return Err(CreationError::OsError("No EGL display connection available".to_string()));
+ // the first step is to query the list of extensions without any display, if supported
+ let dp_extensions = unsafe {
+ let p = egl.QueryString(ffi::egl::NO_DISPLAY, ffi::egl::EXTENSIONS as i32);
+
+ // this possibility is available only with EGL 1.5 or EGL_EXT_platform_base, otherwise
+ // `eglQueryString` returns an error
+ if p.is_null() {
+ vec![]
+ } else {
+ let p = CStr::from_ptr(p);
+ let list = String::from_utf8(p.to_bytes().to_vec()).unwrap_or_else(|_| format!(""));
+ list.split(' ').map(|e| e.to_string()).collect::<Vec<_>>()
+ }
+ };
+
+ let has_dp_extension = |e: &str| dp_extensions.iter().find(|s| s == &e).is_some();
+
+ // calling `eglGetDisplay` or equivalent
+ let display = match native_display {
+ NativeDisplay::X11(display) if has_dp_extension("EGL_KHR_platform_x11") => {
+ let d = display.unwrap_or(ffi::egl::DEFAULT_DISPLAY as *const _);
+ // TODO: `PLATFORM_X11_SCREEN_KHR`
+ unsafe { egl.GetPlatformDisplay(ffi::egl::PLATFORM_X11_KHR, d as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::X11(display) if has_dp_extension("EGL_EXT_platform_x11") => {
+ let d = display.unwrap_or(ffi::egl::DEFAULT_DISPLAY as *const _);
+ // TODO: `PLATFORM_X11_SCREEN_EXT`
+ unsafe { egl.GetPlatformDisplayEXT(ffi::egl::PLATFORM_X11_EXT, d as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::Gbm(display) if has_dp_extension("EGL_KHR_platform_gbm") => {
+ let d = display.unwrap_or(ffi::egl::DEFAULT_DISPLAY as *const _);
+ unsafe { egl.GetPlatformDisplay(ffi::egl::PLATFORM_GBM_KHR, d as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::Gbm(display) if has_dp_extension("EGL_MESA_platform_gbm") => {
+ let d = display.unwrap_or(ffi::egl::DEFAULT_DISPLAY as *const _);
+ unsafe { egl.GetPlatformDisplayEXT(ffi::egl::PLATFORM_GBM_KHR, d as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::Wayland(display) if has_dp_extension("EGL_KHR_platform_wayland") => {
+ let d = display.unwrap_or(ffi::egl::DEFAULT_DISPLAY as *const _);
+ unsafe { egl.GetPlatformDisplay(ffi::egl::PLATFORM_WAYLAND_KHR, d as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::Wayland(display) if has_dp_extension("EGL_EXT_platform_wayland") => {
+ let d = display.unwrap_or(ffi::egl::DEFAULT_DISPLAY as *const _);
+ unsafe { egl.GetPlatformDisplayEXT(ffi::egl::PLATFORM_WAYLAND_EXT, d as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::Android if has_dp_extension("EGL_KHR_platform_android") => {
+ unsafe { egl.GetPlatformDisplay(ffi::egl::PLATFORM_ANDROID_KHR,
+ ffi::egl::DEFAULT_DISPLAY as *mut _, ptr::null()) }
+ },
+
+ NativeDisplay::Device(display) if has_dp_extension("EGL_EXT_platform_device") => {
+ unsafe { egl.GetPlatformDisplay(ffi::egl::PLATFORM_DEVICE_EXT, display as *mut _,
+ ptr::null()) }
+ },
+
+ NativeDisplay::X11(Some(display)) | NativeDisplay::Gbm(Some(display)) |
+ NativeDisplay::Wayland(Some(display)) | NativeDisplay::Device(display) |
+ NativeDisplay::Other(Some(display)) => {
+ unsafe { egl.GetDisplay(display as *mut _) }
}
- display
+
+ NativeDisplay::X11(None) | NativeDisplay::Gbm(None) | NativeDisplay::Wayland(None) |
+ NativeDisplay::Android | NativeDisplay::Other(None) => {
+ unsafe { egl.GetDisplay(ffi::egl::DEFAULT_DISPLAY as *mut _) }
+ },
};
+ if display.is_null() {
+ return Err(CreationError::OsError("Could not create EGL display object".to_string()));
+ }
+
let egl_version = unsafe {
let mut major: ffi::egl::types::EGLint = mem::uninitialized();
let mut minor: ffi::egl::types::EGLint = mem::uninitialized();
@@ -58,6 +149,17 @@ impl Context {
(major, minor)
};
+ // the list of extensions supported by the client once initialized is different from the
+ // list of extensions obtained earlier
+ let extensions = if egl_version >= (1, 2) {
+ let p = unsafe { CStr::from_ptr(egl.QueryString(display, ffi::egl::EXTENSIONS as i32)) };
+ let list = String::from_utf8(p.to_bytes().to_vec()).unwrap_or_else(|_| format!(""));
+ list.split(' ').map(|e| e.to_string()).collect::<Vec<_>>()
+
+ } else {
+ vec![]
+ };
+
// binding the right API and choosing the version
let (version, api) = unsafe {
match builder.gl_version {
@@ -116,6 +218,7 @@ impl Context {
egl: egl,
display: display,
egl_version: egl_version,
+ extensions: extensions,
api: api,
version: version,
config_id: config_id,
@@ -196,6 +299,7 @@ pub struct ContextPrototype<'a> {
egl: ffi::egl::Egl,
display: ffi::egl::types::EGLDisplay,
egl_version: (ffi::egl::types::EGLint, ffi::egl::types::EGLint),
+ extensions: Vec<String>,
api: Api,
version: Option<(u8, u8)>,
config_id: ffi::egl::types::EGLConfig,
@@ -253,19 +357,19 @@ impl<'a> ContextPrototype<'a> {
{
let context = unsafe {
if let Some(version) = self.version {
- try!(create_context(&self.egl, self.display, &self.egl_version, self.api,
- version, self.config_id, self.builder.gl_debug,
- self.builder.gl_robustness))
+ try!(create_context(&self.egl, self.display, &self.egl_version,
+ &self.extensions, self.api, version, self.config_id,
+ self.builder.gl_debug, self.builder.gl_robustness))
} else if self.api == Api::OpenGlEs {
if let Ok(ctxt) = create_context(&self.egl, self.display, &self.egl_version,
- self.api, (2, 0), self.config_id,
+ &self.extensions, self.api, (2, 0), self.config_id,
self.builder.gl_debug, self.builder.gl_robustness)
{
ctxt
} else if let Ok(ctxt) = create_context(&self.egl, self.display, &self.egl_version,
- self.api, (1, 0), self.config_id,
- self.builder.gl_debug,
+ &self.extensions, self.api, (1, 0),
+ self.config_id, self.builder.gl_debug,
self.builder.gl_robustness)
{
ctxt
@@ -275,19 +379,19 @@ impl<'a> ContextPrototype<'a> {
} else {
if let Ok(ctxt) = create_context(&self.egl, self.display, &self.egl_version,
- self.api, (3, 2), self.config_id,
+ &self.extensions, self.api, (3, 2), self.config_id,
self.builder.gl_debug, self.builder.gl_robustness)
{
ctxt
} else if let Ok(ctxt) = create_context(&self.egl, self.display, &self.egl_version,
- self.api, (3, 1), self.config_id,
- self.builder.gl_debug,
+ &self.extensions, self.api, (3, 1),
+ self.config_id, self.builder.gl_debug,
self.builder.gl_robustness)
{
ctxt
} else if let Ok(ctxt) = create_context(&self.egl, self.display, &self.egl_version,
- self.api, (1, 0), self.config_id,
- self.builder.gl_debug,
+ &self.extensions, self.api, (1, 0),
+ self.config_id, self.builder.gl_debug,
self.builder.gl_robustness)
{
ctxt
@@ -414,23 +518,16 @@ unsafe fn enumerate_configs(egl: &ffi::egl::Egl, display: ffi::egl::types::EGLDi
unsafe fn create_context(egl: &ffi::egl::Egl, display: ffi::egl::types::EGLDisplay,
egl_version: &(ffi::egl::types::EGLint, ffi::egl::types::EGLint),
- api: Api, version: (u8, u8), config_id: ffi::egl::types::EGLConfig,
- gl_debug: bool, gl_robustness: Robustness)
+ extensions: &[String], api: Api, version: (u8, u8),
+ config_id: ffi::egl::types::EGLConfig, gl_debug: bool,
+ gl_robustness: Robustness)
-> Result<ffi::egl::types::EGLContext, CreationError>
{
- let extensions = if egl_version >= &(1, 2) {
- let p = CStr::from_ptr(egl.QueryString(display, ffi::egl::EXTENSIONS as i32));
- String::from_utf8(p.to_bytes().to_vec()).unwrap_or_else(|_| format!(""))
- } else {
- format!("")
- };
-
let mut context_attributes = Vec::with_capacity(10);
let mut flags = 0;
- if egl_version >= &(1, 5) ||
- extensions.contains("EGL_KHR_create_context ") ||
- extensions.ends_with("EGL_KHR_create_context")
+ if egl_version >= &(1, 5) || extensions.iter().find(|s| s == &"EGL_KHR_create_context")
+ .is_some()
{
context_attributes.push(ffi::egl::CONTEXT_MAJOR_VERSION as i32);
context_attributes.push(version.0 as i32);
@@ -439,16 +536,15 @@ unsafe fn create_context(egl: &ffi::egl::Egl, display: ffi::egl::types::EGLDispl
// handling robustness
let supports_robustness = egl_version >= &(1, 5) ||
- extensions.contains("EGL_EXT_create_context_robustness ") ||
- extensions.ends_with("EGL_EXT_create_context_robustness");
+ extensions.iter()
+ .find(|s| s == &"EGL_EXT_create_context_robustness")
+ .is_some();
match gl_robustness {
Robustness::NotRobust => (),
Robustness::NoError => {
- if extensions.contains("EGL_KHR_create_context_no_error ") ||
- extensions.ends_with("EGL_KHR_create_context_no_error")
- {
+ if extensions.iter().find(|s| s == &"EGL_KHR_create_context_no_error").is_some() {
context_attributes.push(ffi::egl::CONTEXT_OPENGL_NO_ERROR_KHR as libc::c_int);
context_attributes.push(1);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-01 00:07:51 +0000