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Merge pull request #407 from tomaka/egl-rework
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Rework EGL
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@tomaka
tomaka committed Apr 30, 2015
2 parents 3b1e57d + 9531174 commit 735df1c
Showing 1 changed file with 236 additions and 65 deletions.
301 changes: 236 additions & 65 deletions src/api/egl/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
use BuilderAttribs;
use CreationError;
use GlRequest;
use PixelFormat;
use Api;

use libc;
Expand All @@ -16,6 +17,8 @@ pub struct Context {
display: ffi::egl::types::EGLDisplay,
context: ffi::egl::types::EGLContext,
surface: ffi::egl::types::EGLSurface,
api: Api,
pixel_format: PixelFormat,
}

impl Context {
Expand All @@ -35,7 +38,7 @@ impl Context {
display
};

let (_major, _minor) = unsafe {
let egl_version = unsafe {
let mut major: ffi::egl::types::EGLint = mem::uninitialized();
let mut minor: ffi::egl::types::EGLint = mem::uninitialized();

Expand All @@ -46,87 +49,111 @@ impl Context {
(major, minor)
};

let use_gles2 = match builder.gl_version {
GlRequest::Specific(Api::OpenGlEs, (2, _)) => true,
GlRequest::Specific(Api::OpenGlEs, _) => false,
GlRequest::Specific(_, _) => return Err(CreationError::NotSupported),
GlRequest::GlThenGles { opengles_version: (2, _), .. } => true,
_ => false,
};

let mut attribute_list = vec!();
attribute_list.push(ffi::egl::RENDERABLE_TYPE as i32);
attribute_list.push(ffi::egl::OPENGL_ES2_BIT as i32);

attribute_list.push(ffi::egl::CONFORMANT as i32);
attribute_list.push(ffi::egl::OPENGL_ES2_BIT as i32);

attribute_list.push(ffi::egl::SURFACE_TYPE as i32);
attribute_list.push(ffi::egl::WINDOW_BIT as i32);

{
let (red, green, blue) = match builder.color_bits.unwrap_or(24) {
24 => (8, 8, 8),
16 => (6, 5, 6),
_ => panic!("Bad color_bits"),
};

attribute_list.push(ffi::egl::RED_SIZE as i32);
attribute_list.push(red);
attribute_list.push(ffi::egl::GREEN_SIZE as i32);
attribute_list.push(green);
attribute_list.push(ffi::egl::BLUE_SIZE as i32);
attribute_list.push(blue);
}

attribute_list.push(ffi::egl::DEPTH_SIZE as i32);
attribute_list.push(builder.depth_bits.unwrap_or(8) as i32);

attribute_list.push(ffi::egl::NONE as i32);

let config = unsafe {
let mut num_config: ffi::egl::types::EGLint = mem::uninitialized();
let mut config: ffi::egl::types::EGLConfig = mem::uninitialized();
if egl.ChooseConfig(display, attribute_list.as_ptr(), &mut config, 1,
&mut num_config) == 0
{
return Err(CreationError::OsError(format!("eglChooseConfig failed")))
// binding the right API and choosing the version
let (version, api) = unsafe {
match builder.gl_version {
GlRequest::Latest => {
if egl_version >= (1, 4) {
if egl.BindAPI(ffi::egl::OPENGL_API) != 0 {
(None, Api::OpenGl)
} else if egl.BindAPI(ffi::egl::OPENGL_ES_API) != 0 {
(None, Api::OpenGlEs)
} else {
return Err(CreationError::NotSupported);
}
} else {
(None, Api::OpenGlEs)
}
},
GlRequest::Specific(Api::OpenGlEs, version) => {
if egl_version >= (1, 2) {
if egl.BindAPI(ffi::egl::OPENGL_ES_API) == 0 {
return Err(CreationError::NotSupported);
}
}
(Some(version), Api::OpenGlEs)
},
GlRequest::Specific(Api::OpenGl, version) => {
if egl_version < (1, 4) {
return Err(CreationError::NotSupported);
}
if egl.BindAPI(ffi::egl::OPENGL_API) == 0 {
return Err(CreationError::NotSupported);
}
(Some(version), Api::OpenGl)
},
GlRequest::Specific(_, _) => return Err(CreationError::NotSupported),
GlRequest::GlThenGles { opengles_version, opengl_version } => {
if egl_version >= (1, 4) {
if egl.BindAPI(ffi::egl::OPENGL_API) != 0 {
(Some(opengl_version), Api::OpenGl)
} else if egl.BindAPI(ffi::egl::OPENGL_ES_API) != 0 {
(Some(opengles_version), Api::OpenGlEs)
} else {
return Err(CreationError::NotSupported);
}
} else {
(Some(opengles_version), Api::OpenGlEs)
}
},
}

if num_config <= 0 {
return Err(CreationError::OsError(format!("eglChooseConfig returned no available config")))
}

config
};

let configs = unsafe { try!(enumerate_configs(&egl, display, &egl_version, api, version)) };
let (config_id, pixel_format) = try!(builder.choose_pixel_format(configs.into_iter()));

let surface = unsafe {
let surface = egl.CreateWindowSurface(display, config, native_window, ptr::null());
let surface = egl.CreateWindowSurface(display, config_id, native_window, ptr::null());
if surface.is_null() {
return Err(CreationError::OsError(format!("eglCreateWindowSurface failed")))
}
surface
};

let context = unsafe {
let mut context_attributes = vec!();
context_attributes.push(ffi::egl::CONTEXT_CLIENT_VERSION as i32);
context_attributes.push(2);
context_attributes.push(ffi::egl::NONE as i32);

let context = egl.CreateContext(display, config, ptr::null(),
context_attributes.as_ptr());
if context.is_null() {
return Err(CreationError::OsError(format!("eglCreateContext failed")))
if let Some(version) = version {
try!(create_context(&egl, display, &egl_version, api, version, config_id,
builder.gl_debug).map_err(|_| CreationError::NotSupported))

} else if api == Api::OpenGlEs {
if let Ok(ctxt) = create_context(&egl, display, &egl_version, api, (2, 0),
config_id, builder.gl_debug)
{
ctxt
} else if let Ok(ctxt) = create_context(&egl, display, &egl_version, api, (1, 0),
config_id, builder.gl_debug)
{
ctxt
} else {
return Err(CreationError::NotSupported);
}

} else {
if let Ok(ctxt) = create_context(&egl, display, &egl_version, api, (3, 2),
config_id, builder.gl_debug)
{
ctxt
} else if let Ok(ctxt) = create_context(&egl, display, &egl_version, api, (3, 1),
config_id, builder.gl_debug)
{
ctxt
} else if let Ok(ctxt) = create_context(&egl, display, &egl_version, api, (1, 0),
config_id, builder.gl_debug)
{
ctxt
} else {
return Err(CreationError::NotSupported);
}
}
context
};

Ok(Context {
egl: egl,
display: display,
context: context,
surface: surface,
api: api,
pixel_format: pixel_format,
})
}

Expand All @@ -140,6 +167,10 @@ impl Context {
}
}

pub fn get_pixel_format(&self) -> &PixelFormat {
&self.pixel_format
}

pub fn is_current(&self) -> bool {
unsafe { self.egl.GetCurrentContext() == self.context }
}
Expand All @@ -162,8 +193,8 @@ impl Context {
}
}

pub fn get_api(&self) -> ::Api {
::Api::OpenGlEs
pub fn get_api(&self) -> Api {
self.api
}
}

Expand All @@ -183,3 +214,143 @@ impl Drop for Context {
}
}
}

unsafe fn enumerate_configs(egl: &ffi::egl::Egl, display: ffi::egl::types::EGLDisplay,
egl_version: &(ffi::egl::types::EGLint, ffi::egl::types::EGLint),
api: Api, version: Option<(u8, u8)>)
-> Result<Vec<(ffi::egl::types::EGLConfig, PixelFormat)>, CreationError>
{
let mut num_configs = mem::uninitialized();
if egl.GetConfigs(display, ptr::null_mut(), 0, &mut num_configs) == 0 {
return Err(CreationError::OsError(format!("eglGetConfigs failed")));
}

let mut configs_ids = Vec::with_capacity(num_configs as usize);
if egl.GetConfigs(display, configs_ids.as_mut_ptr(),
configs_ids.capacity() as ffi::egl::types::EGLint,
&mut num_configs) == 0
{
return Err(CreationError::OsError(format!("eglGetConfigs failed")));
}
configs_ids.set_len(num_configs as usize);

// analyzing each config
let mut result = Vec::with_capacity(num_configs as usize);
for config_id in configs_ids {
macro_rules! attrib {
($egl:expr, $display:expr, $config:expr, $attr:expr) => (
{
let mut value = mem::uninitialized();
let res = $egl.GetConfigAttrib($display, $config,
$attr as ffi::egl::types::EGLint, &mut value);
if res == 0 {
return Err(CreationError::OsError(format!("eglGetConfigAttrib failed")));
}
value
}
)
};

let renderable = attrib!(egl, display, config_id, ffi::egl::RENDERABLE_TYPE) as u32;
let conformant = attrib!(egl, display, config_id, ffi::egl::CONFORMANT) as u32;

if api == Api::OpenGlEs {
if let Some(version) = version {
if version.0 == 3 && (renderable & ffi::egl::OPENGL_ES3_BIT == 0 ||
conformant & ffi::egl::OPENGL_ES3_BIT == 0)
{
continue;
}

if version.0 == 2 && (renderable & ffi::egl::OPENGL_ES2_BIT == 0 ||
conformant & ffi::egl::OPENGL_ES2_BIT == 0)
{
continue;
}

if version.0 == 1 && (renderable & ffi::egl::OPENGL_ES_BIT == 0 ||
conformant & ffi::egl::OPENGL_ES_BIT == 0)
{
continue;
}
}

} else if api == Api::OpenGl {
if renderable & ffi::egl::OPENGL_BIT == 0 ||
conformant & ffi::egl::OPENGL_BIT == 0
{
continue;
}
}

if attrib!(egl, display, config_id, ffi::egl::SURFACE_TYPE) & ffi::egl::WINDOW_BIT as i32 == 0 {
continue;
}

if attrib!(egl, display, config_id, ffi::egl::TRANSPARENT_TYPE) != ffi::egl::NONE as i32 {
continue;
}

if attrib!(egl, display, config_id, ffi::egl::COLOR_BUFFER_TYPE) != ffi::egl::RGB_BUFFER as i32 {
continue;
}

result.push((config_id, PixelFormat {
hardware_accelerated: attrib!(egl, display, config_id, ffi::egl::CONFIG_CAVEAT)
!= ffi::egl::SLOW_CONFIG as i32,
red_bits: attrib!(egl, display, config_id, ffi::egl::RED_SIZE) as u8,
green_bits: attrib!(egl, display, config_id, ffi::egl::BLUE_SIZE) as u8,
blue_bits: attrib!(egl, display, config_id, ffi::egl::GREEN_SIZE) as u8,
alpha_bits: attrib!(egl, display, config_id, ffi::egl::ALPHA_SIZE) as u8,
depth_bits: attrib!(egl, display, config_id, ffi::egl::DEPTH_SIZE) as u8,
stencil_bits: attrib!(egl, display, config_id, ffi::egl::STENCIL_SIZE) as u8,
stereoscopy: false,
double_buffer: true,
multisampling: match attrib!(egl, display, config_id, ffi::egl::SAMPLES) {
0 | 1 => None,
a => Some(a as u16),
},
srgb: false, // TODO: use EGL_KHR_gl_colorspace to know that
}));
}

Ok(result)
}

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)
-> Result<ffi::egl::types::EGLContext, ()>
{
let mut context_attributes = vec![];

if egl_version >= &(1, 5) {
context_attributes.push(ffi::egl::CONTEXT_MAJOR_VERSION as i32);
context_attributes.push(version.0 as i32);
context_attributes.push(ffi::egl::CONTEXT_MINOR_VERSION as i32);
context_attributes.push(version.1 as i32);

if gl_debug {
context_attributes.push(ffi::egl::CONTEXT_OPENGL_DEBUG as i32);
context_attributes.push(ffi::egl::TRUE as i32);
}

} else {
if api == Api::OpenGlEs {
context_attributes.push(ffi::egl::CONTEXT_CLIENT_VERSION as i32);
context_attributes.push(version.0 as i32);
}
}

context_attributes.push(ffi::egl::NONE as i32);

let context = egl.CreateContext(display, config_id, ptr::null(),
context_attributes.as_ptr());

if context.is_null() {
return Err(());
}

Ok(context)
}

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