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

use crate::{ColorMaterial, Sprite, TextureAtlas, TextureAtlasSprite};
use bevy_asset::{Assets, Handle};
use bevy_ecs::Resources;
use bevy_render::{
    pipeline::{
        BlendDescriptor, BlendFactor, BlendOperation, ColorStateDescriptor, ColorWrite,
        CompareFunction, CullMode, DepthStencilStateDescriptor, FrontFace, PipelineDescriptor,
        RasterizationStateDescriptor, StencilStateDescriptor, StencilStateFaceDescriptor,
    },
    render_graph::{base, AssetRenderResourcesNode, RenderGraph, RenderResourcesNode},
    shader::{Shader, ShaderStage, ShaderStages},
    texture::TextureFormat,
};
use bevy_type_registry::TypeUuid;

pub const SPRITE_PIPELINE_HANDLE: Handle<PipelineDescriptor> =
    Handle::weak_from_u64(PipelineDescriptor::TYPE_UUID, 2785347840338765446);

pub const SPRITE_SHEET_PIPELINE_HANDLE: Handle<PipelineDescriptor> =
    Handle::weak_from_u64(PipelineDescriptor::TYPE_UUID, 9016885805180281612);

pub fn build_sprite_sheet_pipeline(shaders: &mut Assets<Shader>) -> PipelineDescriptor {
    PipelineDescriptor {
        rasterization_state: Some(RasterizationStateDescriptor {
            front_face: FrontFace::Ccw,
            cull_mode: CullMode::None,
            depth_bias: 0,
            depth_bias_slope_scale: 0.0,
            depth_bias_clamp: 0.0,
            clamp_depth: false,
        }),
        depth_stencil_state: Some(DepthStencilStateDescriptor {
            format: TextureFormat::Depth32Float,
            depth_write_enabled: true,
            depth_compare: CompareFunction::LessEqual,
            stencil: StencilStateDescriptor {
                front: StencilStateFaceDescriptor::IGNORE,
                back: StencilStateFaceDescriptor::IGNORE,
                read_mask: 0,
                write_mask: 0,
            },
        }),
        color_states: vec![ColorStateDescriptor {
            format: TextureFormat::default(),
            color_blend: BlendDescriptor {
                src_factor: BlendFactor::SrcAlpha,
                dst_factor: BlendFactor::OneMinusSrcAlpha,
                operation: BlendOperation::Add,
            },
            alpha_blend: BlendDescriptor {
                src_factor: BlendFactor::One,
                dst_factor: BlendFactor::One,
                operation: BlendOperation::Add,
            },
            write_mask: ColorWrite::ALL,
        }],
        ..PipelineDescriptor::new(ShaderStages {
            vertex: shaders.add(Shader::from_glsl(
                ShaderStage::Vertex,
                include_str!("sprite_sheet.vert"),
            )),
            fragment: Some(shaders.add(Shader::from_glsl(
                ShaderStage::Fragment,
                include_str!("sprite_sheet.frag"),
            ))),
        })
    }
}

pub fn build_sprite_pipeline(shaders: &mut Assets<Shader>) -> PipelineDescriptor {
    PipelineDescriptor {
        rasterization_state: Some(RasterizationStateDescriptor {
            front_face: FrontFace::Ccw,
            cull_mode: CullMode::None,
            depth_bias: 0,
            depth_bias_slope_scale: 0.0,
            depth_bias_clamp: 0.0,
            clamp_depth: false,
        }),
        depth_stencil_state: Some(DepthStencilStateDescriptor {
            format: TextureFormat::Depth32Float,
            depth_write_enabled: true,
            depth_compare: CompareFunction::LessEqual,
            stencil: StencilStateDescriptor {
                front: StencilStateFaceDescriptor::IGNORE,
                back: StencilStateFaceDescriptor::IGNORE,
                read_mask: 0,
                write_mask: 0,
            },
        }),
        color_states: vec![ColorStateDescriptor {
            format: TextureFormat::default(),
            color_blend: BlendDescriptor {
                src_factor: BlendFactor::SrcAlpha,
                dst_factor: BlendFactor::OneMinusSrcAlpha,
                operation: BlendOperation::Add,
            },
            alpha_blend: BlendDescriptor {
                src_factor: BlendFactor::One,
                dst_factor: BlendFactor::One,
                operation: BlendOperation::Add,
            },
            write_mask: ColorWrite::ALL,
        }],
        ..PipelineDescriptor::new(ShaderStages {
            vertex: shaders.add(Shader::from_glsl(
                ShaderStage::Vertex,
                include_str!("sprite.vert"),
            )),
            fragment: Some(shaders.add(Shader::from_glsl(
                ShaderStage::Fragment,
                include_str!("sprite.frag"),
            ))),
        })
    }
}

pub mod node {
    pub const COLOR_MATERIAL: &str = "color_material";
    pub const SPRITE: &str = "sprite";
    pub const SPRITE_SHEET: &str = "sprite_sheet";
    pub const SPRITE_SHEET_SPRITE: &str = "sprite_sheet_sprite";
}

pub trait SpriteRenderGraphBuilder {
    fn add_sprite_graph(&mut self, resources: &Resources) -> &mut Self;
}

impl SpriteRenderGraphBuilder for RenderGraph {
    fn add_sprite_graph(&mut self, resources: &Resources) -> &mut Self {
        self.add_system_node(
            node::COLOR_MATERIAL,
            AssetRenderResourcesNode::<ColorMaterial>::new(false),
        );
        self.add_node_edge(node::COLOR_MATERIAL, base::node::MAIN_PASS)
            .unwrap();

        self.add_system_node(node::SPRITE, RenderResourcesNode::<Sprite>::new(true));
        self.add_node_edge(node::SPRITE, base::node::MAIN_PASS)
            .unwrap();

        self.add_system_node(
            node::SPRITE_SHEET,
            AssetRenderResourcesNode::<TextureAtlas>::new(false),
        );

        self.add_system_node(
            node::SPRITE_SHEET_SPRITE,
            RenderResourcesNode::<TextureAtlasSprite>::new(true),
        );

        let mut pipelines = resources.get_mut::<Assets<PipelineDescriptor>>().unwrap();
        let mut shaders = resources.get_mut::<Assets<Shader>>().unwrap();
        pipelines.set_untracked(SPRITE_PIPELINE_HANDLE, build_sprite_pipeline(&mut shaders));
        pipelines.set_untracked(
            SPRITE_SHEET_PIPELINE_HANDLE,
            build_sprite_sheet_pipeline(&mut shaders),
        );
        self
    }
}