Struct opengl_graphics::GlGraphics

pub struct GlGraphics { /* fields omitted */ }

Contains OpenGL data.

Methods

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<'a> 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_colored_textured(colored: Colored, textured: Textured) -> Self

Create a new OpenGL back-end with Colored and Textured 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 viewport(&mut self, x: i32, y: i32, w: i32, h: i32)

Sets viewport with normalized coordinates and center as origin.

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_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 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.