cleanup and rewrite of ppu_registers.c

1 files changed, 22 insertions, 0 deletions

diff --git a/mappers/mapper_000_0.c b/mappers/mapper_000_0.c
new file mode 100644
index 0000000..b79cdbf
--- /dev/null
+++ b/mappers/mapper_000_0.c
@@ -0,0 +1,22 @@
+
+
+__attribute__((hot))
+static uint8_t mapper_000_0_prg_read(struct nes_state *state, uint32_t addr) {
+	struct mapper_000_0 *mapper = (struct mapper_000_0 *)&state->map;
+
+	return state->prg_rom[addr & mapper->mask];
+}
+
+__attribute__((hot))
+static uint8_t mapper_000_0_chr_read(struct nes_state *state, uint32_t addr) {
+	return state->chr_rom[addr];
+}
+
+static void mapper_000_0_init(struct nes_state *state) {
+	struct mapper_000_0 *mapper = (struct mapper_000_0 *)&state->map;
+	state->mapper.prg_read = mapper_000_0_prg_read;
+	state->mapper.chr_read = mapper_000_0_chr_read;
+	mapper->mask = (state->ines.prg_size == 16384) ? 0x3fff : 0x7fff;
+}
+
+