runmat-plot 0.5.6

GPU-accelerated and static plotting for RunMat with WGPU and Plotters
Documentation 
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use crate::gpu::ScalarType;
use std::sync::Arc;
use wgpu::util::DeviceExt;

/// Axis data source used by GPU plot packers.
///
/// For GPU kernels that support both f32 and f64 data paths, we treat axis precision as matching
/// the input scalar type (f32 axes for f32 shaders, f64 axes for f64 shaders). Shaders can cast
/// to f32 for final vertex positions as needed.
#[derive(Clone)]
pub enum AxisData<'a> {
    F32(&'a [f32]),
    F64(&'a [f64]),
    Buffer(Arc<wgpu::Buffer>),
}

#[derive(Clone, Debug)]
pub enum OwnedAxisData {
    F32(Vec<f32>),
    F64(Vec<f64>),
    Buffer(Arc<wgpu::Buffer>),
}

impl OwnedAxisData {
    pub fn from_axis(axis: &AxisData<'_>) -> Self {
        match axis {
            AxisData::F32(values) => Self::F32(values.to_vec()),
            AxisData::F64(values) => Self::F64(values.to_vec()),
            AxisData::Buffer(buffer) => Self::Buffer(buffer.clone()),
        }
    }

    pub async fn export_f64(
        &self,
        device: &Arc<wgpu::Device>,
        queue: &Arc<wgpu::Queue>,
        len: usize,
        scalar: ScalarType,
    ) -> Result<Vec<f64>, String> {
        match self {
            Self::F32(values) => Ok(values.iter().map(|value| f64::from(*value)).collect()),
            Self::F64(values) => Ok(values.clone()),
            Self::Buffer(buffer) => {
                crate::gpu::util::readback_scalar_buffer_f64(device, queue, buffer, len, scalar)
                    .await
            }
        }
    }
}

pub fn axis_storage_buffer(
    device: &Arc<wgpu::Device>,
    label: &'static str,
    axis: &AxisData<'_>,
    scalar: ScalarType,
) -> Result<Arc<wgpu::Buffer>, String> {
    match axis {
        AxisData::Buffer(buffer) => Ok(buffer.clone()),
        AxisData::F32(values) => {
            if scalar != ScalarType::F32 {
                return Err(format!("{label}: expected f64 axis data for f64 shader"));
            }
            Ok(Arc::new(device.create_buffer_init(
                &wgpu::util::BufferInitDescriptor {
                    label: Some(label),
                    contents: bytemuck::cast_slice(values),
                    usage: wgpu::BufferUsages::STORAGE
                        | wgpu::BufferUsages::COPY_DST
                        | wgpu::BufferUsages::COPY_SRC,
                },
            )))
        }
        AxisData::F64(values) => {
            if scalar != ScalarType::F64 {
                return Err(format!("{label}: expected f32 axis data for f32 shader"));
            }
            Ok(Arc::new(device.create_buffer_init(
                &wgpu::util::BufferInitDescriptor {
                    label: Some(label),
                    contents: bytemuck::cast_slice(values),
                    usage: wgpu::BufferUsages::STORAGE
                        | wgpu::BufferUsages::COPY_DST
                        | wgpu::BufferUsages::COPY_SRC,
                },
            )))
        }
    }
}