more ppu

include/gb.h

@@ -88,18 +88,22 @@ enum {
 };
 
 typedef struct gb_dmg_ppu_t {
+	GBPixBuf *pixbuf;
 	ut64 seek;
 	ut8 buf[GB_PPU_N_REGS];
 	int reg_fd;
 	int vram_fd;
 } GBPPU;
 
+//these are in STAT
 #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
+#define	GB_PPU_MODE1	1
+#define	GB_PPU_MODE2	2
+#define	GB_PPU_MODE3	3
+#define	GB_PPU_MODE_MASK	3
+
+//this is in seek
+#define	GB_PPU_DOUBLE_SPEED	0x10000
 
 typedef struct gameboy_t {
 	RIO *io;
@@ -108,9 +112,8 @@ typedef struct gameboy_t {
 	GBJoypad *joypad;
 	GBDMA *dma;
 	GBPPU *ppu;
-	GBPixBuf *pixbuf;
+	ut64 addr;
 	int cartrigde_fd;
-	
 } GB;
 
 GBPPU *gb_ppu_open (RIO *io);

io/ppu.c

@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <string.h>
+#include <gb.h>
+#include <r_io.h>
+#include <r_util.h>
+
+RIOPlugin r_io_plugin_gb_ppu;
+
+static ut64 __lseek(RIO* io, RIODesc *desc, ut64 offset, int whence) {
+	GBPPU *ppu = desc->data;
+	ut64 seek = ppu->seek & 0xffff;
+	switch (whence) {
+	case R_IO_SEEK_SET:
+		seek = R_MIN (GB_PPU_N_REGS, offset);
+		break;
+	case R_IO_SEEK_CUR:
+		seek = R_MIN (GB_PPU_N_REGS, seek + offset);
+		break;
+	case R_IO_SEEK_END:
+		seek = GB_PPU_N_REGS;
+		break;
+	}
+	ppu->seek = (ppu->seek & (~0xffff)) | seek;
+	return seek;
+}
+
+static bool __check(RIO *io, const char *pathname, bool many) {
+	return r_str_startswith (pathname, "gb_ppu://");
+}
+
+static int __read(RIO *io, RIODesc *desc, ut8 *buf, int len) {
+	GBPPU *ppu = desc->data;
+	ut64 seek = ppu->seek & 0xffff;
+	if (ppu->seek >= GB_PPU_N_REGS || len < 1) {
+		return 0;
+	}
+	len = R_MIN (len, GB_PPU_N_REGS - seek);
+	memcpy (buf, &ppu->buf[ppu->seek], len);
+	seek += len;
+	ppu->seek = (ppu->seek & (~0xffff)) | seek;
+	return len;
+}
+
+static int __write(RIO *io, RIODesc *desc, const ut8 *buf, int len) {
+	GBPPU *ppu = desc->data;
+	ut64 seek = ppu->seek & 0xffff;
+	if (ppu->seek >= GB_PPU_N_REGS || len < 1) {
+		return 0;
+	}
+	len = R_MIN (len, GB_PPU_N_REGS - seek);
+	ut32 i;
+	for (i = 0; i < len; i++) {
+		switch (seek) {
+		case GB_PPU_STAT:
+			ppu->buf[GB_PPU_STAT] = (buf[i] & 0xf8) | (ppu->buf[GB_PPU_STAT] & 0x7);
+		case GB_PPU_LY:
+			break;
+		default:
+			ppu->buf[seek] = buf[i];
+			break;
+		}
+		seek++;
+	}
+	return len;
+}
+
+static bool __close(RIODesc *desc) {
+	return true;
+}
+
+static RIODesc *__open(RIO *io, const char *pathname, int rw, int mode) {
+	if (!r_str_startswith (pathname, "gb_ppu://")) {
+		return NULL;
+	}
+	GBPPU *ppu = NULL;
+	sscanf (pathname, "gb_ppu://%p", &ppu);
+	RIODesc *desc = r_io_desc_new (io, &r_io_plugin_gb_ppu, pathname,
+		R_PERM_RWX, mode, ppu);
+	return desc;
+}
+
+RIOPlugin r_io_plugin_gb_ppu = {
+	.meta = {
+		.name = "gb_ppu",
+		.desc = "gb_ppu",
+		.license = "LGPL",
+	},
+	.uris = "gb_ppu://",
+	.open = __open,
+	.close = __close,
+	.read = __read,
+	.check = __check,
+	.seek = __lseek,
+	.write = __write,
+};