Struct GlGraphics

pub struct GlGraphics { /* private fields */ }

Contains OpenGL data.

Implementations

impl GlGraphics

pub fn get_uniform<T: UniformType + ?Sized>( &self, name: &str, ) -> Option<ShaderUniform<T>>

Try to get uniform from the current shader of a given name.

impl GlGraphics

pub 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.

pub fn from_pieces( colored: Colored, textured: Textured, textured_color: TexturedColor, ) -> Self

Create a new OpenGL back-end with Colored, Textured and TexturedColor structs to describe how to render objects.

Panics

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

pub fn get_current_program(&self) -> Option<GLuint>

Returns the current program

pub fn use_program(&mut self, program: GLuint)

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

pub fn clear_program(&mut self)

Unset the current program.

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

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

Sets the current draw state, by detecting changes.

pub fn clear_draw_state(&mut self)

Unsets the current draw state.

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

pub fn draw_begin(&mut self, viewport: Viewport) -> Context

Setup that should be called at the start of a frame’s draw call.

pub fn draw_end(&mut self)

Finalize the frame’s draw calls.

pub fn draw<F, U>(&mut self, viewport: Viewport, f: F) -> U

where F: FnOnce(Context, &mut Self) -> U,

Convenience for wrapping draw calls with the begin and end methods.

This is preferred over using the draw_begin & draw_end methods explicitly but may be less flexible.

pub 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 dyn FnMut(&[[f32; 2]])),

Renders list of 2d triangles using a solid color.

fn tri_list_c<F>(&mut self, draw_state: &DrawState, f: F)

where F: FnMut(&mut dyn FnMut(&[[f32; 2]], &[[f32; 4]])),

Same as tri_list, but with individual vertex colors.

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

where F: FnMut(&mut dyn FnMut(&[[f32; 2]], &[[f32; 2]])),

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

fn tri_list_uv_c<F>(&mut self, draw_state: &DrawState, texture: &Texture, f: F)

where F: FnMut(&mut dyn FnMut(&[[f32; 2]], &[[f32; 2]], &[[f32; 4]])),

Same as tri_list_uv, but with individual vertex colors.

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.