1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
use gfx::Factory;
use gfx::format::{ChannelTyped, Srgb, Srgba8, Swizzle};
use gfx::handle::RenderTargetView;
use gfx::memory::{Bind, Usage};
use gfx::texture::{AaMode, Kind};
use Context;
use conf::*;
use error::*;
use graphics::*;
#[derive(Debug)]
pub struct CanvasGeneric<Spec>
where
Spec: BackendSpec,
{
target: RenderTargetView<Spec::Resources, Srgba8>,
image: Image,
}
pub type Canvas = CanvasGeneric<GlBackendSpec>;
impl Canvas {
pub fn new(
ctx: &mut Context,
width: u32,
height: u32,
samples: NumSamples,
) -> GameResult<Canvas> {
let (w, h) = (width as u16, height as u16);
let aa = match samples {
NumSamples::One => AaMode::Single,
s => AaMode::Multi(s as u8),
};
let kind = Kind::D2(w, h, aa);
let cty = Srgb::get_channel_type();
let levels = 1;
let factory = &mut ctx.gfx_context.factory;
let tex = factory.create_texture(
kind,
levels,
Bind::SHADER_RESOURCE | Bind::RENDER_TARGET | Bind::TRANSFER_SRC,
Usage::Data,
Some(cty),
)?;
let resource = factory.view_texture_as_shader_resource::<Srgba8>(
&tex,
(0, levels - 1),
Swizzle::new(),
)?;
let target = factory.view_texture_as_render_target(&tex, 0, None)?;
Ok(Canvas {
target,
image: Image {
texture: resource,
texture_handle: tex,
sampler_info: ctx.gfx_context.default_sampler_info,
blend_mode: None,
width,
height,
},
})
}
pub fn with_window_size(ctx: &mut Context) -> GameResult<Canvas> {
use graphics;
let (w, h) = graphics::get_drawable_size(ctx);
Canvas::new(ctx, w, h, NumSamples::One)
}
pub fn get_image(&self) -> &Image {
&self.image
}
pub fn into_inner(self) -> Image {
self.image
}
}
impl Drawable for Canvas {
fn draw_ex(&self, ctx: &mut Context, param: DrawParam) -> GameResult<()> {
let mut flipped_param = param;
flipped_param.scale.y *= -1.0;
flipped_param.dest.y += self.image.height() as f32 * param.scale.y;
self.image.draw_ex(ctx, flipped_param)?;
Ok(())
}
fn set_blend_mode(&mut self, mode: Option<BlendMode>) {
self.image.blend_mode = mode;
}
fn get_blend_mode(&self) -> Option<BlendMode> {
self.image.blend_mode
}
}
pub fn set_canvas(ctx: &mut Context, target: Option<&Canvas>) {
match target {
Some(surface) => {
ctx.gfx_context.data.out = surface.target.clone();
}
None => {
ctx.gfx_context.data.out = ctx.gfx_context.screen_render_target.clone();
}
};
}