diff options
Diffstat (limited to 'crates/fparkan-render/src')
| -rw-r--r-- | crates/fparkan-render/src/water.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/crates/fparkan-render/src/water.rs b/crates/fparkan-render/src/water.rs index 58a2817..7a5ccbd 100644 --- a/crates/fparkan-render/src/water.rs +++ b/crates/fparkan-render/src/water.rs @@ -7,6 +7,21 @@ pub const EMBM_BUMP_TILE: f32 = 100.0; /// Native diagonal bump matrix, without luminance modulation. pub const EMBM_COEFFICIENTS: [f32; 2] = [0.01, 0.01]; +/// Terrain draws ordinary textured water into its reflection with this alpha. +pub const REFLECTED_WATER_ALPHA: f32 = 0.1; + +/// Native packet category 4 enables source-alpha blending without changing depth. +#[must_use] +pub fn legacy_reflected_water_pipeline( + state: crate::LegacyPipelineState, +) -> crate::LegacyPipelineState { + crate::LegacyPipelineState { + blend: crate::LegacyBlendMode::SourceAlpha, + alpha_test: true, + ..state + } +} + /// Square reflection size chosen by Terrain.dll RVA 0x27FC7 from renderer dimensions. #[must_use] pub fn legacy_embm_reflection_size(extent: [u32; 2]) -> u32 { @@ -128,6 +143,28 @@ mod tests { use super::*; #[test] + fn reflected_water_blends_material_alpha_and_preserves_depth_and_cull() { + use crate::{LegacyBlendMode, LegacyCullMode, LegacyDepthMode, LegacyPipelineState}; + for depth in [ + LegacyDepthMode::Disabled, + LegacyDepthMode::TestWrite, + LegacyDepthMode::TestReadOnly, + ] { + let original = LegacyPipelineState { + depth, + cull: LegacyCullMode::FrontFace, + ..LegacyPipelineState::default() + }; + let fallback = legacy_reflected_water_pipeline(original); + assert_eq!(fallback.blend, LegacyBlendMode::SourceAlpha); + assert!(fallback.alpha_test); + assert_eq!(fallback.depth, original.depth); + assert_eq!(fallback.cull, original.cull); + } + assert_eq!(REFLECTED_WATER_ALPHA.to_bits(), 0x3dcc_cccd); + } + + #[test] fn reflection_size_matches_native_renderer_dimension_vectors() { for (extent, expected) in [ ([1280, 1024], 1024), |