From 5484039e3e9433936c2d400bb1ecde21adb3d9d5 Mon Sep 17 00:00:00 2001
From: Sara Gerretsen <sara.gerretsen@student.hku.nl>
Date: Tue, 23 Sep 2025 14:25:26 +0200
Subject: [PATCH] feat: added basic culling to cell renderer

---
 src/simulation.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/simulation.cpp b/src/simulation.cpp
index e50de58..c068106 100644
--- a/src/simulation.cpp
+++ b/src/simulation.cpp
@@ -271,8 +271,8 @@ void Draw(SDL_Renderer *renderer, double cellSizePercent) {
 		viewOffset.x += input::scrollMotion.x;
 		viewOffset.y += input::scrollMotion.y;
 	}
-	int w;
-	SDL_GetCurrentRenderOutputSize(renderer, &w, nullptr);
+	int w, h;
+	SDL_GetCurrentRenderOutputSize(renderer, &w, &h);
 	float const cellWidth = static_cast<float>(w) * cellSizePercent;
 	SDL_FRect cellRect{
 		0, 0, cellWidth, cellWidth
@@ -281,6 +281,8 @@ void Draw(SDL_Renderer *renderer, double cellSizePercent) {
 	for (Cell const &cell : living) {
 		cellRect.x = (viewOffset.x + cell.x) * cellRect.w;
 		cellRect.y = (viewOffset.y + cell.y) * cellRect.h;
+		if (cellRect.x < -cellRect.w || cellRect.y < -cellRect.h || cellRect.x > w || cellRect.y > h)
+			continue;
 		SDL_RenderFillRect(renderer, &cellRect);
 	}
 	if (!drawDebugInfo) {
@@ -293,6 +295,8 @@ void Draw(SDL_Renderer *renderer, double cellSizePercent) {
 		for (Cell const &cell : wl->changes) {
 			cellRect.x = (viewOffset.x + cell.x) * cellRect.w;
 			cellRect.y = (viewOffset.y + cell.y) * cellRect.h;
+			if (cellRect.x < -cellRect.w || cellRect.y < -cellRect.h || cellRect.x > w || cellRect.y > h)
+				continue;
 			SDL_RenderRect(renderer, &cellRect);
 		}
 	}
@@ -302,6 +306,8 @@ void Draw(SDL_Renderer *renderer, double cellSizePercent) {
 		for (Cell const &cell : wl->changes) {
 			cellRect.x = (viewOffset.x + cell.x) * cellRect.w;
 			cellRect.y = (viewOffset.y + cell.y) * cellRect.h;
+			if (cellRect.x < -cellRect.w || cellRect.y < -cellRect.h || cellRect.x > w || cellRect.y > h)
+				continue;
 			SDL_RenderRect(renderer, &cellRect);
 		}
 	}
@@ -311,6 +317,8 @@ void Draw(SDL_Renderer *renderer, double cellSizePercent) {
 		for (Cell const &cell : wl->changes) {
 			cellRect.x = (viewOffset.x + cell.x) * cellRect.w;
 			cellRect.y = (viewOffset.y + cell.y) * cellRect.h;
+			if (cellRect.x < -cellRect.w || cellRect.y < -cellRect.h || cellRect.x > w || cellRect.y > h)
+				continue;
 			SDL_RenderRect(renderer, &cellRect);
 		}
 	}