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start implementing ppu_render_update

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condret 2024-11-01 06:32:24 +01:00
parent e88697c773
commit 3436097c6d
2 changed files with 52 additions and 1 deletions
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20
include/gb.h
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@ -102,13 +102,33 @@ typedef struct oam_scan_table {
ut8 addr;
} OAMScanTable;
typedef struct pixel_fifo_t {
ut64 data;
ut32 fetch;
ut32 obj_fetch;
ut8 shift_out; //lower nibble is sourch info, pallet, color
// 0b....spcc
#if 0
bg - 00
win - 01
obj p0 - 10
obj p1 - 11
#endif
ut8 n_fpixel; //number of pixel that are currently in the upper half of the fifo - 1
ut8 x;
ut8 y;
} PixelFifo;
typedef struct gb_dmg_ppu_t {
GBPixBuf *pixbuf;
ut64 seek;
ut8 buf[GB_PPU_N_REGS];
OAMScanTable ost;
PixelFifo fifo;
int reg_fd;
int vram_fd;
ut32 vram_mapid;
ut32 oam_mapid;
} GBPPU;
typedef struct gameboy_t {

33
io/ppu.c
View File

@ -145,7 +145,7 @@ static ut32 gb_ppu_oam_scan_update (GB *gb, ut32 cycles) {
if (gb->ppu->ost.n_entries < 10) {
ut8 yx[2];
r_io_fd_read_at (gb->io, gb->dma->oam_fd, (ut64)gb->ppu->ost.addr, yx, 2);
if ((yx[0] <= ly) && (ly < (yx[0] + height))) {
if ((yx[0] <= ly) && (ly < (yx[0] + height)) && yx[1]) {
gb->ppu->ost.data[gb->ppu->ost.n_entries] =
(gb->ppu->ost.addr << 8) | yx[1];
gb->ppu->ost.n_entries++;
@ -158,10 +158,38 @@ beach:
if (gb->ppu->ost.addr == 0xa0) {
//indicate next mode
gb->ppu->buf[GB_PPU_STAT] |= GB_PPU_STAT_MODE_RENDER;
RIOMap *vram = r_io_map_get (gb->io, gb->ppu->vram_mapid);
vram->perm = 0; //disable vram access for rendering
}
return cycles;
}
static void gb_ppu_pixel_fifo_merge_opixels (PixelFifo *pxf, bool priority) {
ut32 pixels = pxf->data >> 32;
ut32 newpixels = 0;
ut32 i;
for (i = 0; i < 8; i++) {
if (!(pixels & (0x3 << 28))) {
newpixels = (newpixels << 4) |
((pxf->obj_fetch & (0xf << ((i - 1) << 2))) >> ((i - 1) << 2));
pixels = pixels << 4;
continue;
}
}
}
static ut32 gb_ppu_render_update (GB *gb, ut32 cycles) {
return 0;
}
static ut32 gb_ppu_hblank_update (GB *gb, ut32 cycles) {
return 0;
}
static ut32 gb_ppu_vblank_update (GB *gb, ut32 cycles) {
return 0;
}
void gb_ppu_update (GB *gb, ut32 cycles) {
while (cycles) {
switch (gb->ppu->buf[GB_PPU_STAT] & GB_PPU_STAT_MODE_MASK) {
@ -169,10 +197,13 @@ void gb_ppu_update (GB *gb, ut32 cycles) {
cycles = gb_ppu_oam_scan_update (gb, cycles);
break;
case GB_PPU_STAT_MODE_RENDER:
cycles = gb_ppu_render_update (gb, cycles);
break;
case GB_PPU_STAT_MODE_HBLANK:
cycles = gb_ppu_hblank_update (gb, cycles);
break;
case GB_PPU_STAT_MODE_VBLANK:
cycles = gb_ppu_vblank_update (gb, cycles);
break;
}
}