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## 🚀 What's New in v1.1.3 — *True TAA, HDR Bloom Pyramid & Black-Water Regression Fix* Version **1.1.3** completes the TAA pipeline (Halton sub-pixel camera jitter + YCoCg variance clipping), replaces the old single-pass bloom with a true multi-octave HDR gaussian pyramid, and fixes the long-standing **black-water regression** with MRT-proof water detection. It also adds procedural raindrop rings, biome-aware murky swamp water, underwater plant sway, post-TAA sharpening, and a ~48 MB VRAM cleanup. ### 🎯 True Temporal Anti-Aliasing (Halton Jitter + YCoCg Clipping) * **Halton(2,3) sub-pixel camera jitter** — every gbuffer vertex shader can offset `gl_Position` by a rotating 8-frame Halton pattern (±0.5 px). Previously TAA only blended history without jittering the sample point, so it could only blur noise instead of reconstructing sub-pixel detail. * **`TAA_JITTER` option — Off / Subtle / Standard / Strong** (new in v1.1.3). The jitter is **OFF by default in all profiles** for a rock-steady image; Subtle (±0.25 px), Standard (±0.5 px) and Strong (±0.75 px) scale the amplitude for users who want the full sub-pixel reconstruction (removes high-frequency shimmer at the cost of a slight temporal wobble). Requires TAA enabled. * **Previous-frame jitter compensation** in `composite1.fsh` — the old frame's offset is re-added to the reprojection (with the same strength scale), so static images converge instead of smearing ~0.5 px. Only active while jitter is on. * **YCoCg variance clipping (μ ± γσ)** replaces the axis-aligned 3×3 min/max box — the old box caused ghost trails on saturated high-contrast edges (fences, wires, hot specular) while being too tight on flat gradients. Clip width scales with `TAA_STRENGTH`: 1.50 Light / 1.25 Balanced / 1.10 Stable. * **Frame-rotated IGN dithers now resolve cleanly** — godrays and volumetric clouds rotate their interleaved-gradient-noise patterns per frame; with the temporal resolve they integrate into smooth gradients instead of shimmering. * **TAA is on by default in HIGH / ULTRA / EXTREME profiles** (off on VERY_LOW / LOW / MED for maximum FPS); it can be toggled in the Post-Processing menu, and `TAA_STRENGTH` presets the variance-clip tightness. ### ✨ HDR Gaussian-Pyramid Bloom (composite3 – composite7) * Replaces the v1.0.1 single-pass 3×3 neighbour glow, whose ~1.5 px radius could only produce a tight halo. * New 5-pass chain: threshold **brightpass** (0.75 luma soft-knee, exposure-aware) → tight separable gaussian (9-tap, σ≈2.0) → wide separable gaussian (4× stride). Successive blurs compose to an effective **σ ≈ 8.2 px** — a soft cinematic falloff around the sun/moon disks, lava, portals and hot specular, without a mip chain. * Runs **after the TAA resolve**, so the bloom energy is temporally stable. * New **`HDR_BLOOM`** option (Subtle 0.06 / Balanced 0.12 / Strong 0.22 amplitude) wired into every quality profile. ### 💧 Black-Water Regression Fix — MRT-Proof Water Detection * **Root cause:** on some Iris builds the translucent pass drops the `colortex1`/`colortex2` MRT writes entirely — water then arrives with a zeroed normal + alpha + lightmap. The emissive fast-path (alpha < 0.5) swallowed it and every tag/lightmap-based system died with it. * **Detection ladder:** primary = `colortex2.a = 0.8` tag; **rescue** = the depth difference (`depthtex1` solid-only vs `depthtex0`) proves a translucent surface on top, then a **hue-fingerprint classifier** on the albedo rejects portals (violet, green-starved) and lava (blue-starved) while accepting water (blue/blue-green, never pale). Water, ice and glass classify; torch flames, portal sparkles, squid ink, pale ice and clear glass do not. * **Synthesized flat water normal** when the decoded normal is untrustworthy (MRT loss or clear value), so Fresnel/reflections still have sane inputs. * **Analytic sky reflection (`waterSkyRefl`)** — zenith/horizon gradient + warm sun-side glow, dimension-aware (Overworld palette, Nether biome sheen, End violet sheen), applied via Schlick Fresnel with a **0.20 floor** (pure F0≈0.02 at steep look-down angles was exactly what let shadowed water crush to black), multiplied by skyLight so cave water stays dark. This is the actual black-water fix and works with SSR disabled. * **Diffuse ambient floor** for rescued pixels whose lightmap may read zero. * **Navy-tint floor** in `gbuffers_water`/`gbuffers_terrain_translucent` — frozen-ocean biome tints (e.g. 0x3938C9) can no longer crush R/G to black after the gamma pipeline. * **`WATER_DEBUG`** diagnostics overlay (Off / Classify / Lightmap / Raw tag alpha) — green = healthy tag, red = depth-rescued, yellow = rescued from the emissive path, magenta = lava/portal-guarded. ### 🪟 SSR & Refraction Fixes (final.fsh) * **Procedural sky fallback** for reflection rays that leave the screen or hit the sky — previously black (the reason the `waterMirrorBoost` hack existed); now a day/night/sunset/storm-aware gradient with moon-phase brightness, Schlick-Fresnel weighting and edge fade. * SSR march start moved **1.0 → 0.5** view units off the surface so the water plane at the player's feet still reflects near-field geometry. * MRT-proof water detection reused for SSR/refraction (same hue guards as `composite.fsh`). * **Procedural raindrop rings** on wet up-facing surfaces — two layers of expanding, world-stable circular waves perturb the SSR normal so rain reads as thousands of tiny ripples instead of one flat mirror. ### 🔍 Post-TAA Sharpening (POST_SHARPEN) * Gentle 5-tap unsharp mask (0.18 amplitude, clamped ≥ 0) applied to the resolved image **before** refraction/SSR/bloom work, recovering texture detail softened by TAA's history blending. On in MED+ profiles. ### ☁️ Volumetric Clouds — Quality Scaling & Dithered Ray Start * New **`CLOUD_QUALITY`** option: 8 / 12 / 16 raymarch steps (was hardcoded 12) — Cheap / Standard / High. * **Dithered ray start** (frame-rotated IGN) on geometry pixels when TAA is enabled: the frame-rotating pattern is temporally resolved into a smooth volumetric integral, killing the 12-step ribbing on thick cumulus without the v0.2.5-era "swimming". Sky pixels keep the stable centred start. ### 🌿 Underwater Plants Sway * New block class **10010** (`seagrass`, `tall_seagrass`, `kelp`, `kelp_plant`, `sea_pickle`) — fronds sway in a current, phase-shifted by height so the tips lag the base, storm-agitated along with the surface foliage path. Displacement is mirrored in `shadow.vsh` so shadows follow the visible fronds. ### 🌊 Biome-Aware Murky Water * Smoothed swamp/mangrove detector (`isSwampBiome`) — swamp water absorbs more red and reads **greener and murkier** (`absorption (0.23, 0.038, 0.10)`, deep colour pushed to dark green) instead of open-ocean blue. ### 🧪 Physical Sky — Warm Ground Bounce * The experimental `SKY_MODE=1` atmosphere now includes a **warm ground-bounce term**: terrain's ~15–20% mean albedo re-scatters in the lower atmosphere (strongest at the horizon and with a high sun), removing the "sterile" blue-bias horizon band. ### 🌇 Lighting & Ambience * **Rayleigh-tinted day ambient** — the day hemisphere ambient now follows the actual sun extinction: golden-hour light is warm and blue-depleted instead of static grey-blue. * **Held-light temperature** — strong held sources (sea lantern, glowstone, shroomlight, lava bucket) read slightly cooler than candle-strength light. ### 🌍 Distant Horizons — Soft Seam * The v1.1.2 hard `discard` at `far + 16` is replaced by a **screen-door dithered transition band**: DH LOD fragments stochastically blend into vanilla chunks over 16 m, so crossing the boundary or changing render distance no longer shows a hard cut. The pattern is static per frame (DH-only pixels are excluded from TAA history). ### 🛠️ Pipeline & VRAM Cleanup * **Removed `colortex5`/`colortex6` format directives** — never read or written, but each forced Iris/OptiFine to allocate a full RGBA16F screen buffer: **~32 MB saved @1080p, ~128 MB @4K**. * **`shadowcolor0Format` RGBA16F → RGBA8** (it only carries LDR `tex * glcolor`): another ~16 MB @1080p / ~64 MB @4K. * **`shadowcolor1Format` removed** (nothing ever wrote to it). * **`colortex0Clear = true`** — no stale garbage on the first frame or after a window resize. * `colortex3`/`colortex4` are now actually used by the bloom pyramid; the full 8-buffer HDR pipeline is engaged.