From 85e1c2d573ff98e688331b4f1218511c623fe218 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sat, 3 Aug 2013 01:15:08 -0700
Subject: [PATCH] Exploit cache locality for slightly faster drawing

---
 src/gba/renderers/video-software.c | 4 ++--
 src/gba/renderers/video-software.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/gba/renderers/video-software.c b/src/gba/renderers/video-software.c
index 0d8d5e298..4c470484c 100644
--- a/src/gba/renderers/video-software.c
+++ b/src/gba/renderers/video-software.c
@@ -378,11 +378,10 @@ static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* render
 			backdrop |= softwareRenderer->variantPalette[0];
 		}
 		for (int x = 0; x < VIDEO_HORIZONTAL_PIXELS; ++x) {
-			row[x] = backdrop;
+			softwareRenderer->row[x] = backdrop;
 		}
 	}
 
-	softwareRenderer->row = row;
 	memset(softwareRenderer->spriteLayer, 0, sizeof(softwareRenderer->spriteLayer));
 
 	softwareRenderer->windows[0].endX = VIDEO_HORIZONTAL_PIXELS;
@@ -400,6 +399,7 @@ static void GBAVideoSoftwareRendererDrawScanline(struct GBAVideoRenderer* render
 	}
 
 	_drawScanline(softwareRenderer, y);
+	memcpy(row, softwareRenderer->row, VIDEO_HORIZONTAL_PIXELS * sizeof(*row));
 }
 
 static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer) {
diff --git a/src/gba/renderers/video-software.h b/src/gba/renderers/video-software.h
index f6230194a..4d710ab4c 100644
--- a/src/gba/renderers/video-software.h
+++ b/src/gba/renderers/video-software.h
@@ -86,6 +86,7 @@ struct GBAVideoSoftwareRenderer {
 
 	union GBARegisterDISPCNT dispcnt;
 
+	uint32_t row[VIDEO_HORIZONTAL_PIXELS];
 	uint32_t spriteLayer[VIDEO_HORIZONTAL_PIXELS];
 
 	// BLDCNT
@@ -118,7 +119,6 @@ struct GBAVideoSoftwareRenderer {
 
 	struct GBAVideoSoftwareBackground bg[4];
 
-	uint32_t* row;
 	int start;
 	int end;