Struct ggraphics::GlContext

pub struct GlContext {
    pub gl: Rc<Context>,
    pub passes: Vec<RenderPass>,
    // some fields omitted
}

A type that contains all the STUFF we need for displaying graphics and handling events on both desktop and web. Anything it contains is specialized to the correct type via cfg flags at compile time, rather than trying to use generics or such.

Fields

gl: Rc<Context>

The OpenGL context.

passes: Vec<RenderPass>

The list of render passes.

Methods

impl GlContext

pub fn new(gl: Context) -> Self

Create a new GlContext from the given glow::Context. Does basic setup and state setting.

pub fn default_shader(&self) -> Shader

Get a copy of the default quad shader.

pub fn get_sampler(
    &mut self,
    spec: &SamplerSpec
) -> <Context as HasContext>::Sampler

Get a sampler given the given spec. Samplers are cached, and usually few in number, so you shouldn't free them and this handles caching them for you.

pub fn draw(&mut self)

Draw all contained render passes, in order.

pub fn get_info(&self) -> (String, String, String, String)

Returns OpenGL version info. Vendor, renderer, GL version, GLSL version

pub fn set_screen_viewport(&mut self, x: i32, y: i32, w: i32, h: i32)

Sets the viewport for the final render-to-screen pass. Negative numbers are valid, see glViewport for the math behind it.

Panics if there is no such render pass.