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more ppu

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condret 2024-10-29 02:33:57 +01:00
parent e04e63907b
commit b2ebb5472f
2 changed files with 105 additions and 7 deletions
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17
include/gb.h
View File

@ -88,18 +88,22 @@ enum {
}; };
typedef struct gb_dmg_ppu_t { typedef struct gb_dmg_ppu_t {
GBPixBuf *pixbuf;
ut64 seek; ut64 seek;
ut8 buf[GB_PPU_N_REGS]; ut8 buf[GB_PPU_N_REGS];
int reg_fd; int reg_fd;
int vram_fd; int vram_fd;
} GBPPU; } GBPPU;
//these are in STAT
#define GB_PPU_MODE0 0 #define GB_PPU_MODE0 0
#define GB_PPU_MODE1 0x10000 #define GB_PPU_MODE1 1
#define GB_PPU_MODE2 0x20000 #define GB_PPU_MODE2 2
#define GB_PPU_MODE3 0x30000 #define GB_PPU_MODE3 3
#define GB_PPU_MODE_MASK 0x30000 #define GB_PPU_MODE_MASK 3
#define GB_PPU_DOUBLE_SPEED 0x40000
//this is in seek
#define GB_PPU_DOUBLE_SPEED 0x10000
typedef struct gameboy_t { typedef struct gameboy_t {
RIO *io; RIO *io;
@ -108,9 +112,8 @@ typedef struct gameboy_t {
GBJoypad *joypad; GBJoypad *joypad;
GBDMA *dma; GBDMA *dma;
GBPPU *ppu; GBPPU *ppu;
GBPixBuf *pixbuf; ut64 addr;
int cartrigde_fd; int cartrigde_fd;
} GB; } GB;
GBPPU *gb_ppu_open (RIO *io); GBPPU *gb_ppu_open (RIO *io);

95
io/ppu.c Normal file
View File

@ -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,
};