scena 1.7.0

A Rust-native scene-graph renderer with typed scene state, glTF assets, and explicit prepare/render lifecycles.
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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269

use super::capabilities::{Backend, CapabilityStatus, HardwareTier};

pub(in crate::diagnostics) const fn forward_pbr_status(
    backend: Backend,
    gpu_device: bool,
) -> CapabilityStatus {
    match (backend, gpu_device) {
        (
            Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu | Backend::WebGl2,
            true,
        ) => CapabilityStatus::Supported,
        (
            Backend::Headless
            | Backend::HeadlessGpu
            | Backend::SurfaceDescriptor
            | Backend::NativeSurface
            | Backend::WebGpu
            | Backend::WebGl2,
            false,
        )
        | (Backend::Headless | Backend::SurfaceDescriptor, true) => CapabilityStatus::Degraded,
    }
}

pub(in crate::diagnostics) const fn directional_shadow_status(
    _backend: Backend,
) -> CapabilityStatus {
    CapabilityStatus::Degraded
}

pub(in crate::diagnostics) const fn punctual_shadow_status(_backend: Backend) -> CapabilityStatus {
    CapabilityStatus::FeatureDisabled
}

pub(in crate::diagnostics) const fn hardware_tier(
    backend: Backend,
    gpu_device: bool,
) -> HardwareTier {
    match (backend, gpu_device) {
        (Backend::NativeSurface, true) => HardwareTier::High,
        (Backend::HeadlessGpu | Backend::WebGpu, true) => HardwareTier::Medium,
        (
            Backend::Headless
            | Backend::HeadlessGpu
            | Backend::SurfaceDescriptor
            | Backend::NativeSurface
            | Backend::WebGpu
            | Backend::WebGl2,
            false,
        )
        | (Backend::Headless | Backend::SurfaceDescriptor | Backend::WebGl2, true) => {
            HardwareTier::Low
        }
    }
}

pub(in crate::diagnostics) const fn reversed_z_depth_status(backend: Backend) -> CapabilityStatus {
    gpu_only_status(backend)
}

pub(in crate::diagnostics) const fn directional_shadow_map_default_size(backend: Backend) -> u32 {
    match backend {
        Backend::WebGl2 => 1024,
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu => 2048,
    }
}

pub(in crate::diagnostics) const fn directional_shadow_map_max_size(backend: Backend) -> u32 {
    match backend {
        Backend::WebGl2 => 2048,
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu => 4096,
    }
}

pub(in crate::diagnostics) const fn ibl_default_size(backend: Backend) -> u32 {
    match backend {
        Backend::WebGl2 => 128,
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu => 256,
    }
}

pub(in crate::diagnostics) const fn bloom_status(_backend: Backend) -> CapabilityStatus {
    CapabilityStatus::Supported
}

pub(in crate::diagnostics) const fn ambient_occlusion_status(
    _backend: Backend,
) -> CapabilityStatus {
    CapabilityStatus::Supported
}

pub(in crate::diagnostics) const fn order_independent_transparency_status(
    backend: Backend,
) -> CapabilityStatus {
    match backend {
        Backend::Headless | Backend::SurfaceDescriptor => CapabilityStatus::Supported,
        _ => CapabilityStatus::FeatureDisabled,
    }
}

pub(in crate::diagnostics) const fn physical_glass_transmission_status(
    backend: Backend,
    gpu_device: bool,
) -> CapabilityStatus {
    match (backend, gpu_device) {
        (
            Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu | Backend::WebGl2,
            true,
        ) => CapabilityStatus::Supported,
        (
            Backend::Headless
            | Backend::HeadlessGpu
            | Backend::SurfaceDescriptor
            | Backend::NativeSurface
            | Backend::WebGpu
            | Backend::WebGl2,
            false,
        )
        | (Backend::Headless | Backend::SurfaceDescriptor, true) => CapabilityStatus::Degraded,
    }
}

pub(in crate::diagnostics) const fn wide_gamut_output_status(
    backend: Backend,
    surface_attached: bool,
) -> CapabilityStatus {
    match (backend, surface_attached) {
        (Backend::WebGpu | Backend::WebGl2, true) => CapabilityStatus::Degraded,
        _ => CapabilityStatus::FeatureDisabled,
    }
}

pub(in crate::diagnostics) const fn hardware_instancing_status(
    backend: Backend,
) -> CapabilityStatus {
    gpu_only_status(backend)
}

/// Phase 1F: backend-level support for sampling `texture_2d_array<f32>` /
/// `sampler2DArray`. WebGPU mandates 256+ layer support; WebGL2 GLES 3.0+
/// also exposes array textures. CPU-rasterizer backends keep the per-
/// material bind path.
pub(in crate::diagnostics) const fn texture_arrays_status(backend: Backend) -> CapabilityStatus {
    match backend {
        Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu | Backend::WebGl2 => {
            CapabilityStatus::Supported
        }
        Backend::Headless | Backend::SurfaceDescriptor => CapabilityStatus::FeatureDisabled,
    }
}

/// Phase 1F: minimum guaranteed `max_texture_array_layers` per backend.
/// Both the WebGPU `Limits::default()` and the WebGL2 `GLES 3.0`
/// specification mandate at least 256 layers; runtime adapter probes can
/// report higher values via `Capabilities::with_adapter_limits`.
pub(in crate::diagnostics) const fn max_texture_array_layers(backend: Backend) -> u32 {
    match backend {
        Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu | Backend::WebGl2 => 256,
        Backend::Headless | Backend::SurfaceDescriptor => 0,
    }
}

pub(in crate::diagnostics) const fn fragment_high_precision_status(
    backend: Backend,
) -> CapabilityStatus {
    gpu_only_status(backend)
}

pub(in crate::diagnostics) const fn uniform_buffer_status(backend: Backend) -> CapabilityStatus {
    gpu_only_status(backend)
}

pub(in crate::diagnostics) const fn uniform_buffer_max_bytes(backend: Backend) -> u32 {
    match backend {
        Backend::WebGl2 => 16_384,
        Backend::Headless | Backend::SurfaceDescriptor => 0,
        Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu => 65_536,
    }
}

pub(in crate::diagnostics) const fn default_clipping_planes(backend: Backend) -> u8 {
    match backend {
        Backend::WebGl2 => 4,
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu => 8,
    }
}

pub(in crate::diagnostics) const fn max_clipping_planes(backend: Backend) -> u8 {
    match backend {
        Backend::WebGl2 => 8,
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu => 16,
    }
}

pub(in crate::diagnostics) const fn gpu_frustum_culling_status(
    backend: Backend,
) -> CapabilityStatus {
    match backend {
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu
        | Backend::WebGl2 => CapabilityStatus::FeatureDisabled,
    }
}

pub(in crate::diagnostics) const fn per_instance_culling_status(
    backend: Backend,
) -> CapabilityStatus {
    match backend {
        Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu => {
            CapabilityStatus::Supported
        }
        Backend::Headless | Backend::SurfaceDescriptor | Backend::WebGl2 => {
            CapabilityStatus::Degraded
        }
    }
}

pub(in crate::diagnostics) const fn compute_shader_status(backend: Backend) -> CapabilityStatus {
    gpu_only_status(backend)
}

pub(in crate::diagnostics) const fn storage_buffer_status(backend: Backend) -> CapabilityStatus {
    gpu_only_status(backend)
}

const fn gpu_only_status(backend: Backend) -> CapabilityStatus {
    match backend {
        Backend::HeadlessGpu | Backend::NativeSurface | Backend::WebGpu => {
            CapabilityStatus::Supported
        }
        Backend::Headless | Backend::SurfaceDescriptor | Backend::WebGl2 => {
            CapabilityStatus::FeatureDisabled
        }
    }
}

pub(in crate::diagnostics) const fn readback_status(backend: Backend) -> CapabilityStatus {
    match backend {
        Backend::WebGl2 => CapabilityStatus::Degraded,
        Backend::Headless
        | Backend::HeadlessGpu
        | Backend::SurfaceDescriptor
        | Backend::NativeSurface
        | Backend::WebGpu => CapabilityStatus::Supported,
    }
}