cranpose 0.1.149

Cranpose runtime and UI facade
Documentation 
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pub(crate) fn mobile_memory_hints() -> wgpu::MemoryHints {
    wgpu::MemoryHints::MemoryUsage
}

pub(crate) fn mobile_device_limits(adapter_limits: wgpu::Limits) -> wgpu::Limits {
    let mut limits = wgpu::Limits::downlevel_defaults().using_resolution(adapter_limits.clone());
    limits.max_uniform_buffer_binding_size = adapter_limits
        .max_uniform_buffer_binding_size
        .min(wgpu::Limits::default().max_uniform_buffer_binding_size);
    limits.max_compute_workgroup_storage_size = adapter_limits.max_compute_workgroup_storage_size;
    limits.max_compute_invocations_per_workgroup =
        adapter_limits.max_compute_invocations_per_workgroup;
    limits.max_compute_workgroup_size_x = adapter_limits.max_compute_workgroup_size_x;
    limits.max_compute_workgroup_size_y = adapter_limits.max_compute_workgroup_size_y;
    limits.max_compute_workgroup_size_z = adapter_limits.max_compute_workgroup_size_z;
    limits.max_compute_workgroups_per_dimension =
        adapter_limits.max_compute_workgroups_per_dimension;
    limits.max_storage_buffer_binding_size = adapter_limits.max_storage_buffer_binding_size;
    limits.max_storage_buffers_per_shader_stage =
        adapter_limits.max_storage_buffers_per_shader_stage;
    limits.max_storage_textures_per_shader_stage =
        adapter_limits.max_storage_textures_per_shader_stage;
    limits.max_dynamic_storage_buffers_per_pipeline_layout =
        adapter_limits.max_dynamic_storage_buffers_per_pipeline_layout;
    limits
}

#[cfg(test)]
mod tests {
    use super::mobile_device_limits;

    #[test]
    fn uniform_binding_size_follows_adapter_up_to_desktop_default() {
        let desktop_binding = wgpu::Limits::default().max_uniform_buffer_binding_size;

        let capable = mobile_device_limits(wgpu::Limits::default());
        assert_eq!(capable.max_uniform_buffer_binding_size, desktop_binding);

        let mut minimal = wgpu::Limits::downlevel_defaults();
        minimal.max_uniform_buffer_binding_size = 16384;
        let limits = mobile_device_limits(minimal);
        assert_eq!(limits.max_uniform_buffer_binding_size, 16384);

        let big_textures = wgpu::Limits {
            max_texture_dimension_2d: 16384,
            ..wgpu::Limits::default()
        };
        let limits = mobile_device_limits(big_textures);
        assert_eq!(limits.max_texture_dimension_2d, 16384);
    }

    #[test]
    fn compute_limits_never_exceed_adapter() {
        let no_compute = wgpu::Limits {
            max_compute_workgroups_per_dimension: 0,
            max_compute_invocations_per_workgroup: 0,
            max_compute_workgroup_size_x: 0,
            max_compute_workgroup_size_y: 0,
            max_compute_workgroup_size_z: 0,
            max_compute_workgroup_storage_size: 0,
            ..wgpu::Limits::downlevel_defaults()
        };
        let limits = mobile_device_limits(no_compute);
        assert_eq!(limits.max_compute_workgroups_per_dimension, 0);
        assert_eq!(limits.max_compute_invocations_per_workgroup, 0);
        assert_eq!(limits.max_compute_workgroup_storage_size, 0);
    }

    #[test]
    fn storage_limits_never_exceed_adapter() {
        let no_storage = wgpu::Limits {
            max_storage_buffer_binding_size: 0,
            max_storage_buffers_per_shader_stage: 0,
            max_storage_textures_per_shader_stage: 0,
            max_dynamic_storage_buffers_per_pipeline_layout: 0,
            ..wgpu::Limits::downlevel_defaults()
        };
        let limits = mobile_device_limits(no_storage);
        assert_eq!(limits.max_storage_buffer_binding_size, 0);
        assert_eq!(limits.max_storage_buffers_per_shader_stage, 0);
        assert_eq!(limits.max_storage_textures_per_shader_stage, 0);
        assert_eq!(limits.max_dynamic_storage_buffers_per_pipeline_layout, 0);
    }
}