awsm-renderer 0.4.2

awsm-renderer
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//! Shader cache key for the material prep compute pass (Plan B,
//! docs/plans/deferred-shared-prep-pass.md).

use crate::{render_passes::shader_cache_key::ShaderCacheKeyRenderPass, shaders::ShaderCacheKey};

/// Cache key for the prep compute pipeline.
///
/// `msaa_sample_count` selects the visibility-texture binding type
/// (`texture_multisampled_2d` vs `texture_2d`) — like the classify pass, prep
/// reads sample 0 either way, but the declared type must match. The prep pass is
/// unconditional, so there's no `enabled` field here.
#[derive(Hash, Debug, Clone, PartialEq, Eq)]
pub struct ShaderCacheKeyMaterialPrep {
    pub msaa_sample_count: Option<u32>,
    /// `K` — the clamped per-pixel shadow-caster cap (`PrepPassConfig::clamped_k`).
    /// Threaded into the key so the prep pipeline varies with K (the shadow
    /// loop's slot clamp + the packed-layer count derive from it).
    pub max_shadow_casters: u32,
}

impl From<ShaderCacheKeyMaterialPrep> for ShaderCacheKey {
    fn from(key: ShaderCacheKeyMaterialPrep) -> Self {
        ShaderCacheKey::RenderPass(ShaderCacheKeyRenderPass::MaterialPrep(key))
    }
}