From 9286d483650f68d3f6779a90178109ad25ab5b2b Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Fri, 12 Dec 2025 19:36:12 +0300
Subject: [PATCH] feat: blocks renderer optimization

---
 src/graphics/render/BlocksRenderer.cpp | 3 +--
 src/voxels/Chunks.cpp                  | 5 +++--
 src/voxels/Chunks.hpp                  | 3 ++-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/graphics/render/BlocksRenderer.cpp b/src/graphics/render/BlocksRenderer.cpp
index f2788df38..0d508223b 100644
--- a/src/graphics/render/BlocksRenderer.cpp
+++ b/src/graphics/render/BlocksRenderer.cpp
@@ -692,8 +692,7 @@ void BlocksRenderer::build(const Chunk* chunk, const Chunks* chunks) {
     voxelsBuffer->setPosition(
         chunk->x * CHUNK_W - voxelBufferPadding, 0,
         chunk->z * CHUNK_D - voxelBufferPadding);
-    chunks->getVoxels(*voxelsBuffer, settings.graphics.backlight.get());
-
+    chunks->getVoxels(*voxelsBuffer, settings.graphics.backlight.get(), chunk->top + 1);
     if (voxelsBuffer->pickBlockId(
         chunk->x * CHUNK_W, 0, chunk->z * CHUNK_D
     ) == BLOCK_VOID) {
diff --git a/src/voxels/Chunks.cpp b/src/voxels/Chunks.cpp
index eded34e89..96c709639 100644
--- a/src/voxels/Chunks.cpp
+++ b/src/voxels/Chunks.cpp
@@ -334,7 +334,8 @@ bool Chunks::putChunk(const std::shared_ptr<Chunk>& chunk) {
 // reduce nesting on next modification
 // 25.06.2024: not now
 // 11.11.2024: not now
-void Chunks::getVoxels(VoxelsVolume& volume, bool backlight) const {
+// 12.12.2025: not now
+void Chunks::getVoxels(VoxelsVolume& volume, bool backlight, int top) const {
     voxel* voxels = volume.getVoxels();
     light_t* lights = volume.getLights();
     int x = volume.getX();
@@ -342,7 +343,7 @@ void Chunks::getVoxels(VoxelsVolume& volume, bool backlight) const {
     int z = volume.getZ();
 
     int w = volume.getW();
-    int h = volume.getH();
+    int h = std::min<int>(volume.getH(), top);
     int d = volume.getD();
 
     int scx = floordiv<CHUNK_W>(x);
diff --git a/src/voxels/Chunks.hpp b/src/voxels/Chunks.hpp
index 214e47c67..2448d8333 100644
--- a/src/voxels/Chunks.hpp
+++ b/src/voxels/Chunks.hpp
@@ -9,6 +9,7 @@
 
 #include "typedefs.hpp"
 #include "voxel.hpp"
+#include "constants.hpp"
 #include "util/AreaMap2D.hpp"
 
 class VoxelRenderer;
@@ -126,7 +127,7 @@ public:
     bool isReplaceableBlock(int32_t x, int32_t y, int32_t z);
     bool isObstacleBlock(int32_t x, int32_t y, int32_t z);
 
-    void getVoxels(VoxelsVolume& volume, bool backlight = false) const;
+    void getVoxels(VoxelsVolume& volume, bool backlight = false, int top = CHUNK_H) const;
 
     void setCenter(int32_t x, int32_t z);
     void resize(uint32_t newW, uint32_t newD);