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 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.