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phase(N.5b): retire legacy terrain renderers

Browse source 
Deletes:
- TerrainChunkRenderer.cs (454 lines, replaced by TerrainModernRenderer)
- TerrainRenderer.cs (247 lines, older sibling, no production users)
- terrain.vert / terrain.frag (replaced by terrain_modern.{vert,frag})

Removes the temporary Task 8 perf-benchmark toggle (ACDREAM_LEGACY_TERRAIN
env var, _useLegacyTerrain field, parallel _terrainLegacy renderer
instance, [TERRAIN-DIAG/modern|legacy] label suffix). The modern path
is now the only path. Mirror N.5's mandatory-modern amendment: missing
GL_ARB_bindless_texture throws NotSupportedException at startup
(already in place via the BindlessSupport.TryCreate gate).

Three load-bearing research comments preserved verbatim from terrain.vert
into terrain_modern.vert before deletion: the MIN_FACTOR = 0.0 N-dot-L
floor block (cross-ref Lambert brightness split), the aPacked3 bit
layout, the gl_VertexID corner-table 2026-04-21 ConstructPolygons fix.

Also retires the now-orphaned _shader field (legacy terrain pipeline
was its only user).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-09 12:59:05 +02:00
parent da56063be5
commit 7dfa2af6c0
6 changed files with 31 additions and 1027 deletions
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25
src/AcDream.App/Rendering/Shaders/terrain_modern.vert
View file

@ -41,6 +41,18 @@ out vec4 vRoad0;
out vec4 vRoad1;
flat out float vBaseTexIdx;
// Retail's N·L floor from FUN_00532440 lines 2119/2138/2157/2176 at
// chunk_00530000.c (AdjustPlanes). The decompile reads:
// if (fVar3 < DAT_00796344) fVar3 = DAT_00796344;
// applied to the clamped Lambert result BEFORE it's multiplied into
// dirColor. DAT_00796344's exact literal isn't pinned by the decompile
// but every other "floor" use in retail clamps negatives to zero (the
// physically-correct Lambert half-space). Our previous 0.08 was a
// defensive guess from early acdream days that made back-lit terrain
// visibly brighter than retail (user-observed 2026-04-24 "acdream
// warmer / less blue than retail"). Reverting to 0.0 matches retail
// per the decompile and lets ambient fill in the back side.
// Cross-ref: docs/research/2026-04-24-lambert-brightness-split.md.
const float MIN_FACTOR = 0.0;
vec4 unpackOverlayLayer(uint texIdxU, uint alphaIdxU, uint rotIdx, vec2 baseUV) {
@ -58,6 +70,11 @@ vec4 unpackOverlayLayer(uint texIdxU, uint alphaIdxU, uint rotIdx, vec2 baseUV)
}
void main() {
// Unpack rotation fields from aPacked3. Bit layout (data3):
// .x (byte 0): bits 0-1 rotBase (unused), 2-3 rotOvl0, 4-5 rotOvl1, 6-7 rotOvl2
// .y (byte 1): bits 0-1 rotRd0 (= data3 bit 8-9),
// bits 2-3 rotRd1 (= data3 bit 10-11),
// bit 4 splitDir (= data3 bit 12)
uint rotOvl0 = (aPacked3.x >> 2u) & 3u;
uint rotOvl1 = (aPacked3.x >> 4u) & 3u;
uint rotOvl2 = (aPacked3.x >> 6u) & 3u;
@ -65,6 +82,14 @@ void main() {
uint rotRd1 = (aPacked3.y >> 2u) & 3u;
uint splitDir= (aPacked3.y >> 4u) & 1u;
// Derive which of the 4 cell corners this vertex represents from
// gl_VertexID % 6. The CPU-side LandblockMesh emits vertices in a
// specific order for each split direction; the tables below must stay
// in lockstep with LandblockMesh.Build's SWtoNE/SEtoNW branches.
// 2026-04-21 fix: geometry re-derived to match ACE's ConstructPolygons
// convention. SWtoNE (cut BL→TR, y=x diagonal) now maps to the {BL,BR,TR}
// + {BL,TR,TL} triangle pair; SEtoNW (cut BR→TL, x+y=1 diagonal) maps to
// {BL,BR,TL} + {BR,TR,TL}.
int vIdx = gl_VertexID % 6;
int corner = 0;
if (splitDir == 0u) {