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use gfx::format::Swizzle;
use gfx::handle::RawRenderTargetView;
use gfx::memory::{Bind, Usage};
use gfx::texture::{AaMode, Kind};
use gfx::Factory;
use crate::conf;
use crate::context::DebugId;
use crate::error::*;
use crate::graphics::*;
use crate::Context;
#[derive(Debug)]
pub struct CanvasGeneric<Spec>
where
Spec: BackendSpec,
{
target: RawRenderTargetView<Spec::Resources>,
image: Image,
debug_id: DebugId,
}
pub type Canvas = CanvasGeneric<GlBackendSpec>;
impl Canvas {
pub fn new(
ctx: &mut Context,
width: u16,
height: u16,
samples: conf::NumSamples,
) -> GameResult<Canvas> {
let debug_id = DebugId::get(ctx);
let aa = match samples {
conf::NumSamples::One => AaMode::Single,
s => AaMode::Multi(s as u8),
};
let kind = Kind::D2(width, height, aa);
let levels = 1;
let color_format = ctx.gfx_context.color_format();
let factory = &mut ctx.gfx_context.factory;
let texture_create_info = gfx::texture::Info {
kind,
levels,
format: color_format.0,
bind: Bind::SHADER_RESOURCE | Bind::RENDER_TARGET | Bind::TRANSFER_SRC,
usage: Usage::Data,
};
let tex = factory.create_texture_raw(texture_create_info, Some(color_format.1), None)?;
let resource_desc = gfx::texture::ResourceDesc {
channel: color_format.1,
layer: None,
min: 0,
max: levels - 1,
swizzle: Swizzle::new(),
};
let resource = factory.view_texture_as_shader_resource_raw(&tex, resource_desc)?;
let render_desc = gfx::texture::RenderDesc {
channel: color_format.1,
level: 0,
layer: None,
};
let target = factory.view_texture_as_render_target_raw(&tex, render_desc)?;
Ok(Canvas {
target,
image: Image {
texture: resource,
texture_handle: tex,
sampler_info: ctx.gfx_context.default_sampler_info,
blend_mode: None,
width,
height,
debug_id,
},
debug_id,
})
}
pub fn with_window_size(ctx: &mut Context) -> GameResult<Canvas> {
use crate::graphics;
let (w, h) = graphics::drawable_size(ctx);
Canvas::new(ctx, w as u16, h as u16, conf::NumSamples::One)
}
pub fn image(&self) -> &Image {
&self.image
}
pub fn filter(&self) -> FilterMode {
self.image.filter()
}
pub fn set_filter(&mut self, mode: FilterMode) {
self.image.set_filter(mode)
}
pub fn into_inner(self) -> Image {
self.image
}
}
impl Drawable for Canvas {
fn draw(&self, ctx: &mut Context, param: DrawParam) -> GameResult {
self.debug_id.assert(ctx);
let mut flipped_param = param;
flipped_param.scale.y *= -1.0;
flipped_param.dest.y += f32::from(self.image.height()) * param.scale.y;
self.image.draw(ctx, flipped_param)?;
Ok(())
}
fn dimensions(&self, _: &mut Context) -> Option<Rect> {
Some(self.image.dimensions())
}
fn set_blend_mode(&mut self, mode: Option<BlendMode>) {
self.image.blend_mode = mode;
}
fn blend_mode(&self) -> Option<BlendMode> {
self.image.blend_mode
}
}
pub fn set_canvas(ctx: &mut Context, target: Option<&Canvas>) {
match target {
Some(surface) => {
surface.debug_id.assert(ctx);
ctx.gfx_context.data.out = surface.target.clone();
}
None => {
ctx.gfx_context.data.out = ctx.gfx_context.screen_render_target.clone();
}
};
}