From 21875865c4430a1a32160315090947fdd0f458b8 Mon Sep 17 00:00:00 2001
From: condret <condr3t@protonmail.com>
Date: Mon, 28 Oct 2024 21:03:15 +0100
Subject: [PATCH] Start working on ppu

---
 include/gb.h | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 io/dma.c     | 18 +++++++++++++++++-
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/include/gb.h b/include/gb.h
index 031dc50..709dd3b 100644
--- a/include/gb.h
+++ b/include/gb.h
@@ -7,6 +7,7 @@ enum {
 	GB_TIMERS_TIMA,
 	GB_TIMERS_TMA,
 	GB_TIMERS_TAC,
+	GB_TIMERS_N_REGS,
 };
 
 typedef struct gb_timers_t {
@@ -47,6 +48,7 @@ typedef struct gb_dma_t {
 	ut64 seek;	//17 bit seek and some flags
 	int dma_fd;	//fd representing the dma register
 	int dma_bus_fd;	//fd representing the memory bus while dma occupies it
+	int oam_fd;	//fd representing oam
 	ut32 dma_bank_id;
 	ut32 default_bank_id;
 //	ut16 bus_occupancy_size;
@@ -60,11 +62,58 @@ typedef struct gb_dma_t {
 #define	GB_DMA_LAUNCH	0x20000
 #define	GB_DMA_RUNNING	0x40000
 #define	GB_DMA_ACTIVE	0x60000
+#define	GB_DMA_CGB_MODE	0x80000
 
-GBDMA *gb_dma_open(RIO *io, bool cgb);
+GBDMA *gb_dma_open(RIO *io);
+//void gb_dma_enable_cgb(GBDMA *dma);
 void gb_dma_update(GBDMA *dma, RIO *io, ut32 cycles, bool pre_exec);
 void gb_dma_close(GBDMA *dma, RIO *io);
 
+enum {
+	GB_PPU_LCDC = 0,	//0xff40
+	GB_PPU_STAT,		//0xff41
+	GB_PPU_SCY,		//0xff42
+	GB_PPU_SCX,		//0xff43
+	GB_PPU_LY,		//0xff44
+	GB_PPU_LYC,		//0xff45
+	GB_PPU_BGP,		//0xff47
+	GB_PPU_OBP0,		//0xff48
+	GB_PPU_OBP1,		//0xff49
+	GB_PPU_WY,		//0xff4a
+	GB_PPU_WX,		//0xff4b
+	GB_PPU_N_REGS,
+};
+
+typedef struct gb_dmg_ppu_t {
+	ut64 seek;
+	ut8 buf[GB_PPU_N_REGS];
+	int reg_fd;
+	int vram_fd;
+} GBPPU;
+
+#define	GB_PPU_MODE0	0
+#define	GB_PPU_MODE1	0x10000
+#define	GB_PPU_MODE2	0x20000
+#define	GB_PPU_MODE3	0x30000
+#define	GB_PPU_MODE_MASK	0x30000
+#define	GB_PPU_DOUBLE_SPEED	0x40000
+
+typedef struct gameboy_t {
+	RIO *io;
+	RArch *arch;
+	GBTimers *timers;
+	GBJoypad *joypad;
+	GBDMA *dma;
+	GBPPU *ppu;
+	GBPixBuf *pixbuf;
+	int cartrigde_fd;
+	
+} GB;
+
+GBPPU *gb_ppu_open (RIO *io)
+void gb_ppu_update (GB *gb, ut32 cycles);
+void gb_ppu_close (GBPPU *ppu);
+
 extern RIOPlugin r_io_plugin_gb_timers;
 extern RIOPlugin r_io_plugin_gb_mbc1;
 extern RIOPlugin r_io_plugin_gb_mbc2;
diff --git a/io/dma.c b/io/dma.c
index 5dd8040..2d18a7c 100644
--- a/io/dma.c
+++ b/io/dma.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include <gb.h>
 #include <r_io.h>
 #include <r_util.h>
@@ -171,7 +172,7 @@ RIOPlugin r_io_plugin_gb_dma = {
 	.write = __write,
 };
 
-GBDMA *gb_dma_open (RIO *io, bool cgb) {
+GBDMA *gb_dma_open (RIO *io) {
 	GBDMA *dma = R_NEW0 (GBDMA);
 	if (!dma) {
 		return NULL;
@@ -190,10 +191,18 @@ GBDMA *gb_dma_open (RIO *io, bool cgb) {
 	dma->dma_bank_id = bank->id;
 	char uri[64];
 	memset (uri, 0x00, sizeof (char) * 64);
+	strcpy (uri, "malloc://0xa0");
+	dma->oam_fd = r_io_fd_open (io, uri, R_PERM_RWX, 0);
+	if (oam_fd < 0) {
+		r_io_bank_free (bank);
+		free (dma);
+		return NULL;
+	}
 	sprintf (uri, "gb_dma://%p", dma);
 	RIODesc *desc = r_io_desc_open_plugin (io, &r_io_plugin_gb_dma,
 		uri, R_PERM_RWX, 0);
 	if (!desc) {
+		r_io_fd_close (io, dma->oam_fd);
 		r_io_bank_free (bank);
 		free (dma);
 		return NULL;
@@ -202,6 +211,7 @@ GBDMA *gb_dma_open (RIO *io, bool cgb) {
 	sprintf (uri, "gb_dma_bus://%p", dma);
 	desc = r_io_desc_open_plugin (io, &r_io_plugin_gb_dma_bus, uri, R_PERM_RWX, 0);
 	if (!desc) {
+		r_io_fd_close (io, dma->oam_fd);
 		r_io_fd_close (io, dma->dma_fd);
 		r_io_bank_free (bank);
 		free (dma);
@@ -236,8 +246,13 @@ void gb_dma_update (GBDMA *dma, RIO *io, ut32 cycles, bool pre_exec) {
 		dma->frontrun = ((st32)cycles) * (-1);
 	}
 	if (cycles) {
+#if 1
+		r_io_fd_write_at (io, dma->oam_fd, (ut64)dma->dst,
+			&dma->buf[dma->dst], cycles);
+#else
 		r_io_bank_write_at (io, dma->default_bank_id, 0xfe00 | dma->dst,
 				&dma->buf[dma->dst], cycles);
+#endif
 		dma->dst += cycles;
 	}
 	if (pre_exec) {
@@ -257,5 +272,6 @@ void gb_dma_close (GBDMA *dma, RIO *io) {
 	r_io_bank_del (io, dma->dma_bank_id);
 	r_io_fd_close (io, dma->dma_bus_fd);
 	r_io_fd_close (io, dma->dma_fd);
+	r_io_fd_close (io, dma->oam_fd);
 	free (dma);
 }