Struct rg3d::ContextBuilder

pub struct ContextBuilder<'a, T> where
    T: ContextCurrentState,  {
    pub gl_attr: GlAttributes<&'a Context<T>>,
    pub pf_reqs: PixelFormatRequirements,
}

An object that allows you to build Contexts, RawContext<T>s and WindowedContext<T>s.

One notable limitation of the Wayland backend when it comes to shared Contexts is that both contexts must use the same events loop.

Fields

gl_attr: GlAttributes<&'a Context<T>>

The attributes to use to create the context.

pf_reqs: PixelFormatRequirements

The pixel format requirements

Implementations

impl<'a, T> ContextBuilder<'a, T> where
    T: ContextCurrentState, 

pub fn build_headless<TE>(
    self,
    el: &EventLoopWindowTarget<TE>,
    size: PhysicalSize<u32>
) -> Result<Context<NotCurrent>, CreationError>

Builds the given GL context.

When on a unix operating system, prefer build_surfaceless. If both build_surfaceless and build_headless fail, try using a hidden window, or build_osmesa. Please note that if you choose to use a hidden window, you must still handle the events it generates on the events loop.

Errors can occur in two scenarios:

• If the window could not be created (via permission denied, incompatible system, out of memory, etc.). This should be very rare.
• If the OpenGL Context could not be created. This generally happens because the underlying platform doesn’t support a requested feature.

impl<'a, T> ContextBuilder<'a, T> where
    T: ContextCurrentState, 

pub fn build_windowed<TE>(
    self,
    wb: WindowBuilder,
    el: &EventLoopWindowTarget<TE>
) -> Result<ContextWrapper<NotCurrent, Window>, CreationError>

Builds the given window along with the associated GL context, returning the pair as a WindowedContext<T>.

Errors can occur in two scenarios:

• If the window could not be created (via permission denied, incompatible system, out of memory, etc.). This should be very rare.
• If the OpenGL Context could not be created. This generally happens because the underlying platform doesn’t support a requested feature.

impl<'a> ContextBuilder<'a, NotCurrent>

pub fn new() -> ContextBuilder<'a, NotCurrent>

Initializes a new ContextBuilder with default values.

impl<'a, T> ContextBuilder<'a, T> where
    T: ContextCurrentState, 

pub fn with_gl(self, request: GlRequest) -> ContextBuilder<'a, T>

Sets how the backend should choose the OpenGL API and version.

pub fn with_gl_profile(self, profile: GlProfile) -> ContextBuilder<'a, T>

Sets the desired OpenGL Context profile.

pub fn with_gl_debug_flag(self, flag: bool) -> ContextBuilder<'a, T>

Sets the debug flag for the OpenGL Context.

The default value for this flag is cfg!(debug_assertions), which means that it’s enabled when you run cargo build and disabled when you run cargo build --release.

pub fn with_gl_robustness(self, robustness: Robustness) -> ContextBuilder<'a, T>

Sets the robustness of the OpenGL Context. See the docs of Robustness.

pub fn with_vsync(self, vsync: bool) -> ContextBuilder<'a, T>

Requests that the window has vsync enabled.

By default, vsync is not enabled.

pub fn with_shared_lists<T2>(
    self,
    other: &'a Context<T2>
) -> ContextBuilder<'a, T2> where
    T2: ContextCurrentState, 

Share the display lists with the given Context.

pub fn with_multisampling(self, samples: u16) -> ContextBuilder<'a, T>

Sets the multisampling level to request. A value of 0 indicates that multisampling must not be enabled.

Panic

Will panic if samples is not a power of two.

pub fn with_depth_buffer(self, bits: u8) -> ContextBuilder<'a, T>

Sets the number of bits in the depth buffer.

pub fn with_stencil_buffer(self, bits: u8) -> ContextBuilder<'a, T>

Sets the number of bits in the stencil buffer.

pub fn with_pixel_format(
    self,
    color_bits: u8,
    alpha_bits: u8
) -> ContextBuilder<'a, T>

Sets the number of bits in the color buffer.

pub fn with_stereoscopy(self) -> ContextBuilder<'a, T>

Request the backend to be stereoscopic.

pub fn with_srgb(self, srgb_enabled: bool) -> ContextBuilder<'a, T>

Sets whether sRGB should be enabled on the window.

The default value is true.

pub fn with_double_buffer(
    self,
    double_buffer: Option<bool>
) -> ContextBuilder<'a, T>

Sets whether double buffering should be enabled.

The default value is None.

Platform-specific

This option will be taken into account on the following platforms:

• MacOS
• Unix operating systems using GLX with X
• Windows using WGL

pub fn with_hardware_acceleration(
    self,
    acceleration: Option<bool>
) -> ContextBuilder<'a, T>

Sets whether hardware acceleration is required.

The default value is Some(true)

Platform-specific

This option will be taken into account on the following platforms:

• MacOS
• Unix operating systems using EGL with either X or Wayland
• Windows using EGL or WGL
• Android using EGL

Trait Implementations

impl<'a, T> Clone for ContextBuilder<'a, T> where
    T: Clone + ContextCurrentState, 

pub fn clone(&self) -> ContextBuilder<'a, T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, T> Debug for ContextBuilder<'a, T> where
    T: Debug + ContextCurrentState, 

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'a, T> HeadlessContextExt for ContextBuilder<'a, T> where
    T: ContextCurrentState, 

pub fn build_osmesa(
    self,
    size: PhysicalSize<u32>
) -> Result<Context<NotCurrent>, CreationError> where
    ContextBuilder<'a, T>: Sized, 

Builds an OsMesa context.

pub fn build_surfaceless<TE>(
    self,
    el: &EventLoopWindowTarget<TE>
) -> Result<Context<NotCurrent>, CreationError> where
    ContextBuilder<'a, T>: Sized, 

Builds an EGL-surfaceless context.

impl<'a, T> RawContextExt for ContextBuilder<'a, T> where
    T: ContextCurrentState, 

pub unsafe fn build_raw_wayland_context(
    self,
    display_ptr: *const wl_display,
    surface: *mut c_void,
    width: u32,
    height: u32
) -> Result<ContextWrapper<NotCurrent, ()>, CreationError> where
    ContextBuilder<'a, T>: Sized, 

Creates a raw context on the provided surface.

pub unsafe fn build_raw_x11_context(
    self,
    xconn: Arc<XConnection>,
    xwin: u64
) -> Result<ContextWrapper<NotCurrent, ()>, CreationError> where
    ContextBuilder<'a, T>: Sized, 

Creates a raw context on the provided window.