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-rw-r--r--src/api/egl/mod.rs301
1 files changed, 236 insertions, 65 deletions
diff --git a/src/api/egl/mod.rs b/src/api/egl/mod.rs
index fdea2cd..18e731c 100644
--- a/src/api/egl/mod.rs
+++ b/src/api/egl/mod.rs
@@ -3,6 +3,7 @@
use BuilderAttribs;
use CreationError;
use GlRequest;
+use PixelFormat;
use Api;
use libc;
@@ -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 {
@@ -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();
@@ -46,62 +49,61 @@ 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")))
}
@@ -109,17 +111,40 @@ impl Context {
};
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 {
@@ -127,6 +152,8 @@ impl Context {
display: display,
context: context,
surface: surface,
+ api: api,
+ pixel_format: pixel_format,
})
}
@@ -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 }
}
@@ -162,8 +193,8 @@ impl Context {
}
}
- pub fn get_api(&self) -> ::Api {
- ::Api::OpenGlEs
+ pub fn get_api(&self) -> Api {
+ self.api
}
}
@@ -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)
+}