Struct opengl_graphics::GlGraphics

pub struct GlGraphics { /* fields omitted */ }

Contains OpenGL data.

Methods

impl<'a> GlGraphics

fn new(opengl: OpenGL) -> Self

Creates a new OpenGL back-end.

Panics

If the OpenGL function pointers have not been loaded yet. See https://github.com/PistonDevelopers/opengl_graphics/issues/103 for more info.

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

Sets viewport with normalized coordinates and center as origin.

fn use_program(&mut self, program: GLuint)

Sets the current program only if the program is not in use.

fn clear_program(&mut self)

Unset the current program.

This forces the current program to be set on next drawing call.

fn use_draw_state(&mut self, draw_state: &DrawState)

Sets the current draw state, by detecting changes.

fn clear_draw_state(&mut self)

Unsets the current draw state.

This forces the current draw state to be set on next drawing call.

fn draw<F, U>(&mut self, viewport: Viewport, f: F) -> U where F: FnOnce(Context, &mut Self) -> U

Draws graphics.

fn has_texture_alpha(&self, _texture: &Texture) -> bool

Assume all textures has alpha channel for now.

Trait Implementations

impl Graphics for GlGraphics

type Texture = Texture

The texture type associated with the back-end.

fn clear_color(&mut self, color: [f32; 4])

Clears background with a color.

fn clear_stencil(&mut self, value: u8)

Clears stencil buffer with a value, usually 0.

fn tri_list<F>(&mut self, draw_state: &DrawState, color: &[f32; 4], f: F) where F: FnMut(&mut FnMut(&[f32]))

Renders list of 2d triangles using a solid color.

fn tri_list_uv<F>(&mut self,
                  draw_state: &DrawState,
                  color: &[f32; 4],
                  texture: &Texture,
                  f: F) where F: FnMut(&mut FnMut(&[f32], &[f32]))

Renders list of 2d triangles using a color and a texture.

fn rectangle<R>(&mut self,
                r: &Rectangle,
                rectangle: R,
                draw_state: &DrawState,
                transform: [[f64; 3]; 2]) where R: Into<[f64; 4]>

Draws a rectangle.

fn polygon(&mut self,
           p: &Polygon,
           polygon: &[[f64; 2]],
           draw_state: &DrawState,
           transform: [[f64; 3]; 2])

Draws a polygon.

fn polygon_tween_lerp(&mut self,
                      p: &Polygon,
                      polygons: &[&[[f64; 2]]],
                      tween_factor: f64,
                      draw_state: &DrawState,
                      transform: [[f64; 3]; 2])

Draws a tweened polygon using linear interpolation.

fn image(&mut self,
         image: &Image,
         texture: &Self::Texture,
         draw_state: &DrawState,
         transform: [[f64; 3]; 2])

Draws image.

fn ellipse<R>(&mut self,
              e: &Ellipse,
              rectangle: R,
              draw_state: &DrawState,
              transform: [[f64; 3]; 2]) where R: Into<[f64; 4]>

Draws ellipse.

fn line<L>(&mut self,
           l: &Line,
           line: L,
           draw_state: &DrawState,
           transform: [[f64; 3]; 2]) where L: Into<[f64; 4]>

Draws line.

fn circle_arc<R>(&mut self,
                 c: &CircleArc,
                 rectangle: R,
                 draw_state: &DrawState,
                 transform: [[f64; 3]; 2]) where R: Into<[f64; 4]>

Draws circle arc.

fn deform_image(&mut self,
                d: &DeformGrid,
                texture: &Self::Texture,
                draw_state: &DrawState,
                transform: [[f64; 3]; 2])

Draws deformed image.