ShuriZma
/
flycast
mirror of https://github.com/flyinghead/flycast.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Fix 32-bit vram bank mapping 

Fixes graphical glitches in Naomi games: Melty Blood Act Cadenza, 18
Wheeler, Spawn and probably others
This commit is contained in:
Flyinghead 2018-09-03 12:26:16 +02:00
parent 228b40136f
commit 395bfd5dbb
1 changed files with 17 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
core/hw/pvr/pvr_mem.cpp
View File

@ -195,11 +195,11 @@ u8 DYNACALL pvr_read_area1_8(u32 addr)
u16 DYNACALL pvr_read_area1_16(u32 addr)
{
return *(u16*)&vram[pvr_map32(addr) & VRAM_MASK];
return *(u16*)&vram[pvr_map32(addr)];
}
u32 DYNACALL pvr_read_area1_32(u32 addr)
{
return *(u32*)&vram[pvr_map32(addr) & VRAM_MASK];
return *(u32*)&vram[pvr_map32(addr)];
}
//write
@ -216,7 +216,7 @@ void DYNACALL pvr_write_area1_16(u32 addr,u16 data)
{
fb_dirty = true;
}
*(u16*)&vram[pvr_map32(addr) & VRAM_MASK]=data;
*(u16*)&vram[pvr_map32(addr)]=data;
}
void DYNACALL pvr_write_area1_32(u32 addr,u32 data)
{
@ -227,7 +227,7 @@ void DYNACALL pvr_write_area1_32(u32 addr,u32 data)
{
fb_dirty = true;
}
*(u32*)&vram[pvr_map32(addr) & VRAM_MASK] = data;
*(u32*)&vram[pvr_map32(addr)] = data;
}
void TAWrite(u32 address,u32* data,u32 count)
@ -296,28 +296,27 @@ void pvr_Reset(bool Manual)
u32 pvr_map32(u32 offset32)
{
//64b wide bus is achieved by interleaving the banks every 32 bits
//so bank is Address<<3
//bits <4 are <<1 to create space for bank num
//bank 0 is mapped at 400000 (32b offset) and after
const u32 bank_bit=VRAM_MASK-(VRAM_MASK/2);
const u32 static_bits=(VRAM_MASK-(bank_bit*2)+1)|3;
const u32 moved_bits=VRAM_MASK-static_bits-bank_bit;
u32 bank=(offset32&bank_bit)/bank_bit*4;//bank will be used as upper offset too
u32 lv=offset32&static_bits; //these will survive
offset32&=moved_bits;
offset32<<=1;
// |inbank offset | bank id | lower 2 bits (not changed)
u32 rv= offset32 + bank + lv;
const u32 bank_bit = VRAM_BANK_BIT;
const u32 static_bits = (VRAM_MASK - (VRAM_BANK_BIT * 2 - 1)) | 3;
const u32 offset_bits = (VRAM_BANK_BIT - 1) & ~3;
u32 bank = (offset32 & VRAM_BANK_BIT) / VRAM_BANK_BIT;
u32 rv = offset32 & static_bits;
rv |= (offset32 & offset_bits) * 2;
rv |= bank * 4;
return rv;
}
f32 vrf(u32 addr)
{
return *(f32*)&vram[pvr_map32(addr) & VRAM_MASK];
return *(f32*)&vram[pvr_map32(addr)];
}
u32 vri(u32 addr)
{
return *(u32*)&vram[pvr_map32(addr) & VRAM_MASK];
return *(u32*)&vram[pvr_map32(addr)];
}