1 files changed, 8 insertions, 3 deletions

diff --git a/render.c b/render.c
index 34416c0..dc9962f 100644
--- a/render.c
+++ b/render.c
@@ -32,9 +32,14 @@ void ren_end(Renderer* r) {
 }
 
 void ren_clear(Renderer* r) {
-	int e = r->w * r->h >> 5, i;
-	for (i = 0; i < e; i++)
-		r->t[i] = 0;
+	int i, j;
+	for (j = r->clip[1]; j < r->clip[3]; j++)
+		for (i = r->clip[0]; i < r->clip[2]; i++) {
+			int idx = i + j * r->w;
+			int bit = 1 << (idx & 0x1f);
+			bit = ~bit;
+			r->t[idx >> 5] &= bit;
+		}
 }
 
 void ren_char(Renderer* r, int x, int y, char ch) {