scenevm 0.9.7

A GPU-based layer renderer with configurable compute shaders for Eldiron.
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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222

use super::drawable::Drawable;
use super::style::{StyleParams, StyleRegistry};
use super::text::TextCache;
use crate::{
    Embedded,
    poly2d::Poly2D,
    vm::{Atom, GeoId, VM},
};

/// Renders UI drawables into the 2D layer by emitting quads.
pub struct UiRenderer {
    styles: StyleRegistry,
    text: TextCache,
    next_id: u32,
    tinted_tiles_cache: std::collections::HashMap<(uuid::Uuid, [u8; 16]), uuid::Uuid>, // (base_tile_id, tint_bytes) -> tinted_tile_id
}

impl UiRenderer {
    pub fn new() -> Self {
        let font_bytes = Embedded::get("ui_font.ttf").map(|d| d.data.to_vec());
        Self {
            styles: StyleRegistry::new(),
            text: TextCache::new(font_bytes),
            next_id: 0,
            tinted_tiles_cache: std::collections::HashMap::new(),
        }
    }

    pub fn text_cache(&self) -> &TextCache {
        &self.text
    }

    fn alloc_id(&mut self) -> GeoId {
        let id = self.next_id;
        self.next_id = self.next_id.wrapping_add(1);
        GeoId::Unknown(id)
    }

    /// Emit drawables into the current chunk as 2D polys.
    pub fn render(&mut self, vm: &mut VM, drawables: &[Drawable]) {
        self.render_internal(vm, drawables, true);
    }

    /// Emit drawables without clearing geometry (for rendering to separate layers).
    /// Used when rendering popups to a different VM layer.
    pub fn render_no_clear(&mut self, vm: &mut VM, drawables: &[Drawable]) {
        self.render_internal(vm, drawables, false);
    }

    fn render_internal(&mut self, vm: &mut VM, drawables: &[Drawable], clear: bool) {
        if clear {
            // Wipe previous UI geometry so we don't accumulate quads across frames.
            vm.execute(Atom::ClearGeometry);
        }

        for d in drawables {
            match d {
                Drawable::Quad {
                    tile_id,
                    rect,
                    uv,
                    layer,
                    tint,
                    ..
                } => {
                    let verts = quad_verts(*rect);

                    // Create a tile with tint stored in material texture
                    // The material will store RGBA tint color that the shader can read
                    let tinted_tile_id = self.ensure_tinted_tile(vm, *tile_id, *tint);

                    let poly = Poly2D::poly(
                        self.alloc_id(),
                        tinted_tile_id,
                        verts,
                        uv.to_vec(),
                        vec![(0, 1, 2), (0, 2, 3)],
                    )
                    .with_layer(*layer);
                    vm.execute(Atom::AddPoly { poly });
                }
                Drawable::Rect {
                    rect,
                    fill,
                    border,
                    radius_px,
                    border_px,
                    layer,
                    ..
                } => {
                    let verts = quad_verts(*rect);
                    let style = StyleParams {
                        fill: *fill,
                        border: *border,
                        radius_px: *radius_px,
                        border_px: *border_px,
                    };
                    let style_id = self.styles.ensure_style(vm, style);
                    let tile_id = self.styles.tile_id(style_id).expect("missing style tile");
                    let uv = vec![[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0]];
                    let poly = Poly2D::poly(
                        self.alloc_id(),
                        tile_id,
                        verts,
                        uv,
                        vec![(0, 1, 2), (0, 2, 3)],
                    )
                    .with_layer(*layer);
                    vm.execute(Atom::AddPoly { poly });
                }
                Drawable::Text {
                    id: _,
                    text,
                    origin,
                    px_size,
                    color,
                    layer,
                } => {
                    let glyphs = self.text.layout_positions(text, *px_size);
                    let start_x = origin[0];
                    let start_y = origin[1];
                    for g in glyphs {
                        let Some(entry) = self.text.ensure_glyph(vm, g.parent, *px_size, *color)
                        else {
                            continue;
                        };
                        // Layout gives glyph bounds at (x, y) with width/height.
                        let x0 = start_x + g.x;
                        let y0 = start_y + g.y;
                        let w = g.width as f32;
                        let h = g.height as f32;
                        if w <= 0.0 || h <= 0.0 {
                            continue;
                        }
                        let verts = vec![[x0, y0], [x0 + w, y0], [x0 + w, y0 + h], [x0, y0 + h]];
                        let uv = vec![[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0]];
                        let poly = Poly2D::poly(
                            self.alloc_id(),
                            entry.tile_id,
                            verts,
                            uv,
                            vec![(0, 1, 2), (0, 2, 3)],
                        )
                        .with_layer(*layer);
                        vm.execute(Atom::AddPoly { poly });
                    }
                }
            }
        }
        self.styles.build_if_dirty(vm);
        self.text.build_if_dirty(vm);
    }

    /// Create a tinted version of a tile by copying and tinting the pixel data
    fn ensure_tinted_tile(
        &mut self,
        vm: &mut VM,
        base_tile_id: uuid::Uuid,
        tint: vek::Vec4<f32>,
    ) -> uuid::Uuid {
        // If tint is white (no tint), just return the original tile
        if (tint.x - 1.0).abs() < 0.001
            && (tint.y - 1.0).abs() < 0.001
            && (tint.z - 1.0).abs() < 0.001
            && (tint.w - 1.0).abs() < 0.001
        {
            return base_tile_id;
        }

        // Create a cache key from the tint color bytes
        let mut tint_bytes = [0u8; 16];
        tint_bytes[0..4].copy_from_slice(&tint.x.to_le_bytes());
        tint_bytes[4..8].copy_from_slice(&tint.y.to_le_bytes());
        tint_bytes[8..12].copy_from_slice(&tint.z.to_le_bytes());
        tint_bytes[12..16].copy_from_slice(&tint.w.to_le_bytes());

        let cache_key = (base_tile_id, tint_bytes);

        // Check if we already created this tinted tile
        if let Some(&cached_id) = self.tinted_tiles_cache.get(&cache_key) {
            return cached_id;
        }

        // Get the original tile data
        let tile_data = vm.get_tile_data(base_tile_id);
        if tile_data.is_none() {
            return base_tile_id;
        }

        let (width, height, rgba_data) = tile_data.unwrap();

        // Create tinted copy by multiplying each pixel by the tint color
        let mut tinted_data = rgba_data.clone();
        for i in (0..tinted_data.len()).step_by(4) {
            tinted_data[i] = ((tinted_data[i] as f32 / 255.0 * tint.x) * 255.0) as u8; // R
            tinted_data[i + 1] = ((tinted_data[i + 1] as f32 / 255.0 * tint.y) * 255.0) as u8; // G
            tinted_data[i + 2] = ((tinted_data[i + 2] as f32 / 255.0 * tint.z) * 255.0) as u8; // B
            tinted_data[i + 3] = ((tinted_data[i + 3] as f32 / 255.0 * tint.w) * 255.0) as u8; // A
        }

        // Add the tinted tile with a consistent ID
        let tinted_tile_id = uuid::Uuid::new_v4();
        vm.execute(Atom::AddTile {
            id: tinted_tile_id,
            width,
            height,
            frames: vec![tinted_data],
            material_frames: Some(vec![super::create_tile_material(width, height)]),
        });
        vm.execute(Atom::BuildAtlas);

        // Cache the tinted tile ID
        self.tinted_tiles_cache.insert(cache_key, tinted_tile_id);

        tinted_tile_id
    }
}

fn quad_verts(rect: [f32; 4]) -> Vec<[f32; 2]> {
    let [x, y, w, h] = rect;
    vec![[x, y], [x + w, y], [x + w, y + h], [x, y + h]]
}