rg3d 0.21.0

3D Game engine
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

//! Forward renderer is used to render transparent meshes and meshes with custom blending options.
//!
//! # Notes
//!  
//! This renderer eventually will replace deferred renderer, because deferred renderer is too restrictive.
//! For now it is used **only** to render transparent meshes (or any other mesh that has Forward render
//! path).

use crate::{
    core::{math::Rect, scope_profile},
    renderer::framework::{
        error::FrameworkError,
        framebuffer::{CullFace, DrawParameters, FrameBuffer},
        gpu_program::{GpuProgram, UniformLocation},
        state::PipelineState,
    },
    renderer::{batch::BatchStorage, GeometryCache, RenderPassStatistics},
    scene::{camera::Camera, mesh::RenderPath},
};

pub struct Shader {
    program: GpuProgram,
    pub wvp_matrix: UniformLocation,
    pub diffuse_texture: UniformLocation,
    pub color: UniformLocation,
    pub use_skeletal_animation: UniformLocation,
    pub bone_matrices: UniformLocation,
}

impl Shader {
    pub fn new(state: &mut PipelineState) -> Result<Self, FrameworkError> {
        let fragment_source = include_str!("shaders/forward_fs.glsl");
        let vertex_source = include_str!("shaders/forward_vs.glsl");
        let program =
            GpuProgram::from_source(state, "ForwardShader", vertex_source, fragment_source)?;
        Ok(Self {
            wvp_matrix: program.uniform_location(state, "worldViewProjection")?,
            diffuse_texture: program.uniform_location(state, "diffuseTexture")?,
            color: program.uniform_location(state, "color")?,
            use_skeletal_animation: program.uniform_location(state, "useSkeletalAnimation")?,
            bone_matrices: program.uniform_location(state, "boneMatrices")?,
            program,
        })
    }
}

pub(in crate) struct ForwardRenderer {
    shader: Shader,
}

pub(in crate) struct ForwardRenderContext<'a, 'b> {
    pub state: &'a mut PipelineState,
    pub camera: &'b Camera,
    pub geom_cache: &'a mut GeometryCache,
    pub batch_storage: &'a BatchStorage,
    pub framebuffer: &'a mut FrameBuffer,
    pub viewport: Rect<i32>,
}

impl ForwardRenderer {
    pub(in crate) fn new(state: &mut PipelineState) -> Result<Self, FrameworkError> {
        Ok(Self {
            shader: Shader::new(state)?,
        })
    }

    pub(in crate) fn render(&self, args: ForwardRenderContext) -> RenderPassStatistics {
        scope_profile!();

        let mut statistics = RenderPassStatistics::default();

        let ForwardRenderContext {
            state,
            camera,
            geom_cache,
            batch_storage,
            framebuffer,
            viewport,
        } = args;

        let params = DrawParameters {
            cull_face: CullFace::Back,
            culling: true,
            color_write: Default::default(),
            depth_write: true,
            stencil_test: false,
            depth_test: true,
            blend: true, // TODO: Do not forget to change when renderer will have all features!
        };

        state.set_blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA);

        let initial_view_projection = camera.view_projection_matrix();

        for batch in batch_storage
            .batches
            .iter()
            .filter(|b| b.render_path == RenderPath::Forward)
        {
            let data = batch.data.read().unwrap();
            let geometry = geom_cache.get(state, &data);

            for instance in batch.instances.iter() {
                if camera.visibility_cache.is_visible(instance.owner) {
                    let view_projection = if instance.depth_offset != 0.0 {
                        let mut projection = camera.projection_matrix();
                        projection[14] -= instance.depth_offset;
                        projection * camera.view_matrix()
                    } else {
                        initial_view_projection
                    };

                    statistics += framebuffer.draw(
                        geometry,
                        state,
                        viewport,
                        &self.shader.program,
                        &params,
                        |program_binding| {
                            program_binding
                                .set_texture(&self.shader.diffuse_texture, &batch.diffuse_texture)
                                .set_matrix4(
                                    &self.shader.wvp_matrix,
                                    &(view_projection * instance.world_transform),
                                )
                                .set_bool(&self.shader.use_skeletal_animation, batch.is_skinned)
                                .set_color(&self.shader.color, &instance.color)
                                .set_matrix4_array(
                                    &self.shader.bone_matrices,
                                    instance.bone_matrices.as_slice(),
                                );
                        },
                    );
                }
            }
        }

        statistics
    }
}