Fix palette transparency bug

src/f6502.c

@@ -198,7 +198,7 @@ static inline bool f6502_write(nes_Memory* mem,
                     // Copy to render reference
                     addr &= 0x1FU;
                     uint8_t* pal = mem->ppu.palette;
-                    if (0 == (addr & 0xF)) {
+                    if (0 == (addr & 0x3)) {
                         // TODO: Just initialize this
                         pal[0] = pal[4] = pal[8] = pal[12] =
                             pal[16] = pal[20] = pal[24] =

src/linux/port.c

@@ -123,6 +123,24 @@ int nese_frame_ready(void* plat_data) {
 
     t_last = t_now;
 */
+/*
+    uint8_t* ptr = &plat->sys->core.memory.ppu.vram[0x3C0];
+    for (int y = 0; y < 16; y += 2) {
+        printf("%04lX", 0x2000 + ptr - plat->sys->core.memory.ppu.vram);
+        for (int x = 0; x < 8; ++x) {
+            printf(" %d %d", (*ptr >> 0) & 3, (*ptr >> 2) & 3);
+            ++ptr;
+        }
+        ptr -= 8;
+        fputs("\n    ", stdout);
+        for (int x = 0; x < 8; ++x) {
+            printf(" %d %d", (*ptr >> 4) & 3, (*ptr >> 6) & 3);
+            ++ptr;
+        }
+        putc('\n', stdout);
+    }
+    putc('\n', stdout);
+*/
 
     SDL_BlitSurface(plat->screen, NULL, plat->target, NULL);