From be6617308ea796d2a41007a7bee1472884e189f7 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Thu, 20 May 2021 16:02:45 +0200
Subject: Change dirty_tiles to use a u32[20] instead of u8[20][30]

---
 Makefile              |  2 +-
 src/text.h            |  2 +-
 src/uxn/devices/ppu.c | 25 +++++++++++++++----------
 3 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/Makefile b/Makefile
index 07b662b..89f64a2 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ CFLAGS         += -mcpu=arm7tdmi -mtune=arm7tdmi $(ARCH)
 CFLAGS         += -I$(LIBGBA_SRC)
 LDFLAGS        := $(ARCH) $(SPECS)
 LDLIBS         := $(LIBGBA)
-RELEASE_CFLAGS := -DNDEBUG -O2 -g
+RELEASE_CFLAGS := -DNDEBUG -O2
 DEBUG_CFLAGS   := -DDEBUG -O2 -g
 
 .PHONY: clean run
diff --git a/src/text.h b/src/text.h
index b90c160..0b318bb 100644
--- a/src/text.h
+++ b/src/text.h
@@ -133,7 +133,7 @@ txt_putc_hybrid(char c) {
         int y = text_engine.cursor_y;
         Tile *buf = text_engine.memory;
         buf[x + y * 30] = tile;
-        dirty_tiles[y][x] = 1;
+        dirty_tiles[y] |= 1 << x;
         text_engine.cursor_x += 1;
         if (text_engine.cursor_x >= 30) {
             text_engine.cursor_x = 0;
diff --git a/src/uxn/devices/ppu.c b/src/uxn/devices/ppu.c
index 3865e95..0935329 100644
--- a/src/uxn/devices/ppu.c
+++ b/src/uxn/devices/ppu.c
@@ -144,7 +144,7 @@ static Uint32 unpack_icon_lut_flipx[256] = {
 
 u32 *backbuffer_bg0;
 u32 *backbuffer_bg1;
-static u8 dirty_tiles[20][30] = {0};
+static u32 dirty_tiles[20] = {0};
 
 void
 putcolors(Ppu *p, Uint8 *addr) {
@@ -170,7 +170,7 @@ putpixel(Ppu *p, Uint32 *layer, Uint16 x, Uint16 y, Uint8 color) {
     Uint32 pos = (start_row + ((tile_x + tile_y * 30) * 8));
     Uint32 shift = start_col * 4;
     layer[pos] = (layer[pos] & (~(0xF << shift))) | (color << shift);
-    dirty_tiles[tile_y][tile_x] = 1;
+    dirty_tiles[tile_y] |= 1 << tile_x;
 }
 
 void
@@ -198,7 +198,7 @@ puticn(Ppu *p, Uint32 *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color,
         for (size_t i = 0; i < 8; ++i) {
             layer_ptr[i] = lut[sprite[i ^ flipy]] * color;
         }
-        dirty_tiles[tile_y][tile_x] = 1;
+        dirty_tiles[tile_y] |= 1 << tile_x;
     } else {
         u32 row_mask = 0xFFFFFFFF << shift_left;
         for (size_t i = 0; i < (8 - start_row); ++i) {
@@ -214,10 +214,10 @@ puticn(Ppu *p, Uint32 *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color,
             layer_ptr[8] = (layer_ptr[8] & row_mask) | (sprite_row >> shift_right);
             layer_ptr++;
         }
-        dirty_tiles[tile_y][tile_x] = 1;
-        dirty_tiles[tile_y][tile_x + 1] = 1;
-        dirty_tiles[tile_y + 1][tile_x] = 1;
-        dirty_tiles[tile_y + 1][tile_x + 1] = 1;
+        dirty_tiles[tile_y] |= 1 << tile_x;
+        dirty_tiles[tile_y] |= 1 << (tile_x + 1);
+        dirty_tiles[tile_y + 1] |= 1 << tile_x;
+        dirty_tiles[tile_y + 1] |= 1 << (tile_x + 1);
     }
 }
 
@@ -242,15 +242,20 @@ flipbuf(Ppu *p) {
     Tile *mem_fg = &TILE_MEM[0];
     Tile *mem_bg = &TILE_MEM[2];
     for (size_t j = 0; j < 20; ++j) {
-        for (size_t i = 0; i < 30; ++i) {
-            if (dirty_tiles[j][i] != 0) {
+        if (dirty_tiles[j] == 0) {
+            continue;
+        }
+
+        size_t k = 1;
+        for (size_t i = 0; i < 30; ++i, k <<= 1) {
+            if (dirty_tiles[j] & k) {
                 Tile *tile_fg = p->fg;
                 Tile *tile_bg = p->bg;
                 mem_fg[i + j * 30] = tile_fg[i + j * 30];
                 mem_bg[i + j * 30] = tile_bg[i + j * 30];
-                dirty_tiles[j][i] = 0;
             }
         }
+        dirty_tiles[j] = 0;
     }
 }
 
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