gfx_app 0.9.0

GFX example application framework
Documentation 
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194

// Copyright 2014 The Gfx-rs Developers.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

extern crate cgmath;
#[macro_use]
extern crate gfx;
extern crate gfx_app;

pub use gfx_app::{ColorFormat, DepthFormat};

use cgmath::{Deg, Matrix4, Point3, Vector3};
use gfx::{Bundle, texture};

// Declare the vertex format suitable for drawing,
// as well as the constants used by the shaders
// and the pipeline state object format.
// Notice the use of FixedPoint.
gfx_defines!{
    vertex Vertex {
        pos: [f32; 4] = "a_Pos",
        tex_coord: [f32; 2] = "a_TexCoord",
    }

    constant Locals {
        transform: [[f32; 4]; 4] = "u_Transform",
    }

    pipeline pipe {
        vbuf: gfx::VertexBuffer<Vertex> = (),
        transform: gfx::Global<[[f32; 4]; 4]> = "u_Transform",
        locals: gfx::ConstantBuffer<Locals> = "Locals",
        color: gfx::TextureSampler<[f32; 4]> = "t_Color",
        out_color: gfx::RenderTarget<ColorFormat> = "Target0",
        out_depth: gfx::DepthTarget<DepthFormat> =
            gfx::preset::depth::LESS_EQUAL_WRITE,
    }
}


impl Vertex {
    fn new(p: [i8; 3], t: [i8; 2]) -> Vertex {
        Vertex {
            pos: [p[0] as f32, p[1] as f32, p[2] as f32, 1.0],
            tex_coord: [t[0] as f32, t[1] as f32],
        }
    }
}

//----------------------------------------
struct App<R: gfx::Resources>{
    bundle: Bundle<R, pipe::Data<R>>,
}

impl<R: gfx::Resources> gfx_app::Application<R> for App<R> {
    fn new<F: gfx::Factory<R>>(factory: &mut F, backend: gfx_app::shade::Backend, window_targets: gfx_app::WindowTargets<R>) -> Self {
        use gfx::traits::FactoryExt;

        let vs = gfx_app::shade::Source {
            glsl_120: include_bytes!("shader/cube_120.glslv"),
            glsl_150: include_bytes!("shader/cube_150_core.glslv"),
            glsl_es_100: include_bytes!("shader/cube_100_es.glslv"),
            glsl_es_300: include_bytes!("shader/cube_300_es.glslv"),
            hlsl_40:  include_bytes!("data/vertex.fx"),
            msl_11: include_bytes!("shader/cube_vertex.metal"),
            vulkan:   include_bytes!("data/vert.spv"),
            .. gfx_app::shade::Source::empty()
        };
        let ps = gfx_app::shade::Source {
            glsl_120: include_bytes!("shader/cube_120.glslf"),
            glsl_150: include_bytes!("shader/cube_150_core.glslf"),
            glsl_es_100: include_bytes!("shader/cube_100_es.glslf"),
            glsl_es_300: include_bytes!("shader/cube_300_es.glslf"),
            hlsl_40:  include_bytes!("data/pixel.fx"),
            msl_11: include_bytes!("shader/cube_frag.metal"),
            vulkan:   include_bytes!("data/frag.spv"),
            .. gfx_app::shade::Source::empty()
        };

        let vertex_data = [
            // top (0, 0, 1)
            Vertex::new([-1, -1,  1], [0, 0]),
            Vertex::new([ 1, -1,  1], [1, 0]),
            Vertex::new([ 1,  1,  1], [1, 1]),
            Vertex::new([-1,  1,  1], [0, 1]),
            // bottom (0, 0, -1)
            Vertex::new([-1,  1, -1], [1, 0]),
            Vertex::new([ 1,  1, -1], [0, 0]),
            Vertex::new([ 1, -1, -1], [0, 1]),
            Vertex::new([-1, -1, -1], [1, 1]),
            // right (1, 0, 0)
            Vertex::new([ 1, -1, -1], [0, 0]),
            Vertex::new([ 1,  1, -1], [1, 0]),
            Vertex::new([ 1,  1,  1], [1, 1]),
            Vertex::new([ 1, -1,  1], [0, 1]),
            // left (-1, 0, 0)
            Vertex::new([-1, -1,  1], [1, 0]),
            Vertex::new([-1,  1,  1], [0, 0]),
            Vertex::new([-1,  1, -1], [0, 1]),
            Vertex::new([-1, -1, -1], [1, 1]),
            // front (0, 1, 0)
            Vertex::new([ 1,  1, -1], [1, 0]),
            Vertex::new([-1,  1, -1], [0, 0]),
            Vertex::new([-1,  1,  1], [0, 1]),
            Vertex::new([ 1,  1,  1], [1, 1]),
            // back (0, -1, 0)
            Vertex::new([ 1, -1,  1], [0, 0]),
            Vertex::new([-1, -1,  1], [1, 0]),
            Vertex::new([-1, -1, -1], [1, 1]),
            Vertex::new([ 1, -1, -1], [0, 1]),
        ];

        let index_data: &[u16] = &[
             0,  1,  2,  2,  3,  0, // top
             4,  5,  6,  6,  7,  4, // bottom
             8,  9, 10, 10, 11,  8, // right
            12, 13, 14, 14, 15, 12, // left
            16, 17, 18, 18, 19, 16, // front
            20, 21, 22, 22, 23, 20, // back
        ];

        let (vbuf, slice) = factory.create_vertex_buffer_with_slice(&vertex_data, index_data);

        let texels = [[0x20, 0xA0, 0xC0, 0xFF]];
        let (_, texture_view) = factory.create_texture_immutable::<gfx::format::Rgba8>(
            texture::Kind::D2(1, 1, texture::AaMode::Single), texture::Mipmap::Provided, &[&texels]
            ).unwrap();

        let sinfo = texture::SamplerInfo::new(
            texture::FilterMethod::Bilinear,
            texture::WrapMode::Clamp);

        let pso = factory.create_pipeline_simple(
            vs.select(backend).unwrap(),
            ps.select(backend).unwrap(),
            pipe::new()
        ).unwrap();

        let proj = cgmath::perspective(Deg(45.0f32), window_targets.aspect_ratio, 1.0, 10.0);

        let data = pipe::Data {
            vbuf: vbuf,
            transform: (proj * default_view()).into(),
            locals: factory.create_constant_buffer(1),
            color: (texture_view, factory.create_sampler(sinfo)),
            out_color: window_targets.color,
            out_depth: window_targets.depth,
        };

        App {
            bundle: Bundle::new(slice, pso, data),
        }
    }

    fn render<C: gfx::CommandBuffer<R>>(&mut self, encoder: &mut gfx::Encoder<R, C>) {
        let locals = Locals { transform: self.bundle.data.transform };
        encoder.update_constant_buffer(&self.bundle.data.locals, &locals);
        encoder.clear(&self.bundle.data.out_color, [0.1, 0.2, 0.3, 1.0]);
        encoder.clear_depth(&self.bundle.data.out_depth, 1.0);
        self.bundle.encode(encoder);
    }

    fn on_resize(&mut self, window_targets: gfx_app::WindowTargets<R>) {
        self.bundle.data.out_color = window_targets.color;
        self.bundle.data.out_depth = window_targets.depth;

        // In this example the transform is static except for window resizes.
        let proj = cgmath::perspective(Deg(45.0f32), window_targets.aspect_ratio, 1.0, 10.0);
        self.bundle.data.transform = (proj * default_view()).into();
    }
}

pub fn main() {
    use gfx_app::Application;
    App::launch_simple("Cube example");
}

fn default_view() -> Matrix4<f32> {
    Matrix4::look_at(
        Point3::new(1.5f32, -5.0, 3.0),
        Point3::new(0f32, 0.0, 0.0),
        Vector3::unit_z(),
    )
}