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sys_initial_check OK, documented, error message files debinarised (#437) 

* OK

* Symbols and other documentation

* Remove externs

* spec

* More documentation, decompile the texture files,
some uintptr_t and size_t

* Top-of-file comment

* Move symbols back into right order

* Use some defines

* Missed an osTvType and a size_t

* Add missing header to os.h

* Use segment symbol macros

* Remove duplicate header

* Address review suggestions
This commit is contained in:
EllipticEllipsis 2021-11-15 22:57:16 +00:00 committed by GitHub
parent 20f3a190f4
commit 7134e81898
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
19 changed files with 199 additions and 76 deletions
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5
assets/xml/misc/locerrmsg.xml Normal file
View File

@ -0,0 +1,5 @@
<Root>
<File Name="locerrmsg" Segment="1">
<Texture Name="gNotDesignedForSystemErrorTex" OutName="not_designed_for_system_error" Format="i4" Width="208" Height="16" Offset="0x0"/>
</File>
</Root>

6
assets/xml/misc/memerrmsg.xml Normal file
View File

@ -0,0 +1,6 @@
<Root>
<File Name="memerrmsg" Segment="1">
<Texture Name="gExpansionPakNotInstalledErrorTex" OutName="expansion_pak_not_installed_error" Format="i4" Width="128" Height="37" Offset="0x0"/>
<Texture Name="gSeeInstructionBookletErrorTex" OutName="see_instruction_booklet_error" Format="i4" Width="128" Height="37" Offset="0x940"/>
</File>
</Root>

3
include/color.h
View File

@ -3,6 +3,9 @@
#include "PR/ultratypes.h"
// For checking the alpha bit in an RGBA16 pixel
#define RGBA16_PIXEL_OPAQUE 1
typedef struct {
/* 0x0 */ u8 r;
/* 0x1 */ u8 g;

16
include/functions.h
View File

@ -15,9 +15,9 @@ s32 DmaMgr_FindDmaIndex(u32 vromAddr);
const char* func_800809F4(u32 param_1);
void DmaMgr_ProcessMsg(DmaRequest* req);
void DmaMgr_ThreadEntry(void* arg);
s32 DmaMgr_SendRequestImpl(DmaRequest* request, void* vramStart, u32 vromStart, size_t size, UNK_TYPE4 unused,
s32 DmaMgr_SendRequestImpl(DmaRequest* request, void* vramStart, uintptr_t vromStart, size_t size, UNK_TYPE4 unused,
OSMesgQueue* callback, void* callbackMesg);
s32 DmaMgr_SendRequest0(void* vramStart, u32 vromStart, size_t size);
s32 DmaMgr_SendRequest0(void* vramStart, uintptr_t vromStart, size_t size);
void DmaMgr_Start(void);
void DmaMgr_Stop(void);
void* Yaz0_FirstDMA(void);
@ -356,8 +356,8 @@ const char* strchr(const char* __s, s32 __c);
size_t strlen(const char* __s);
void* memcpy(void* __dest, const void* __src, size_t __n);
void osCreateMesgQueue(OSMesgQueue* mq, OSMesg* msq, s32 count);
void osInvalICache(void* vaddr, s32 nbytes);
void osInvalDCache(void* vaddr, s32 nbytes);
void osInvalICache(void* vaddr, size_t nbytes);
void osInvalDCache(void* vaddr, size_t nbytes);
void __osTimerServicesInit(void);
void __osTimerInterrupt(void);
void __osSetTimerIntr(OSTime tim);
@ -3257,10 +3257,10 @@ s32 func_80178A94(s32 param_1, s32 param_2);
// void func_80178DAC(void);
// void func_80178E3C(void);
// void func_80178E7C(void);
void Check_WriteRGBA16Pixel(u16* buffer, u32 x, u32 y, u16 value);
void Check_WriteI4Pixel(u16* buffer, u32 x, u32 y, u32 value);
void Check_DrawI4Texture(u16* buffer, u32 x, u32 y, u32 width, u32 height, u8* texture);
void Check_ClearRGBA16(s16* buffer);
// void Check_WriteRGBA16Pixel(u16* buffer, u32 x, u32 y, u32 value);
// void Check_WriteI4Pixel(u16* buffer, u32 x, u32 y, u32 value);
// void Check_DrawI4Texture(u16* buffer, u32 x, u32 y, u32 width, u32 height, u8* texture);
// void Check_ClearRGBA16(u16* buffer);
// void Check_DrawExpansionPakErrorMessage(void);
// void Check_DrawRegionLockErrorMessage(void);
void Check_ExpansionPak(void);

3
include/os.h
View File

@ -1,6 +1,7 @@
#ifndef _OS_H_
#define _OS_H_
#include "libc/stdint.h"
#include "libc/stdlib.h"
#include "ultra64/thread.h"
#include "ultra64/message.h"
@ -84,7 +85,7 @@ typedef struct {
typedef struct {
/* 0x00 */ OSIoMesgHdr hdr;
/* 0x08 */ void* dramAddr;
/* 0x0C */ u32 devAddr;
/* 0x0C */ uintptr_t devAddr;
/* 0x10 */ size_t size;
/* 0x14 */ OSPiHandle* piHandle;
} OSIoMesg; // size = 0x88

2
include/segment_symbols.h
View File

@ -1161,7 +1161,9 @@ DECLARE_ROM_SEGMENT(scene_texture_07)
DECLARE_ROM_SEGMENT(scene_texture_08)
DECLARE_ROM_SEGMENT(nintendo_rogo_static)
DECLARE_ROM_SEGMENT(title_static)
DECLARE_SEGMENT(memerrmsg)
DECLARE_ROM_SEGMENT(memerrmsg)
DECLARE_SEGMENT(locerrmsg)
DECLARE_ROM_SEGMENT(locerrmsg)
DECLARE_ROM_SEGMENT(parameter_static)
DECLARE_ROM_SEGMENT(week_static)

16
include/ultra64/vi.h
View File

@ -5,14 +5,14 @@
#include "ultra64/message.h"
/* Special Features */
#define OS_VI_GAMMA_ON 0x0001
#define OS_VI_GAMMA_OFF 0x0002
#define OS_VI_GAMMA_DITHER_ON 0x0004
#define OS_VI_GAMMA_DITHER_OFF 0x0008
#define OS_VI_DIVOT_ON 0x0010
#define OS_VI_DIVOT_OFF 0x0020
#define OS_VI_DITHER_FILTER_ON 0x0040
#define OS_VI_DITHER_FILTER_OFF 0x0080
#define OS_VI_GAMMA_ON (1 << 0)
#define OS_VI_GAMMA_OFF (1 << 1)
#define OS_VI_GAMMA_DITHER_ON (1 << 2)
#define OS_VI_GAMMA_DITHER_OFF (1 << 3)
#define OS_VI_DIVOT_ON (1 << 4)
#define OS_VI_DIVOT_OFF (1 << 5)
#define OS_VI_DITHER_FILTER_ON (1 << 6)
#define OS_VI_DITHER_FILTER_OFF (1 << 7)
#define OS_VI_GAMMA 0x08
#define OS_VI_GAMMA_DITHER 0x04

2
include/variables.h
View File

@ -12,7 +12,7 @@ extern u32 osRomBase;
extern u32 osResetType;
extern u32 osCicId;
extern u32 osVersion;
extern u32 osMemSize;
extern size_t osMemSize;
extern s32 osAppNmiBuffer[0x10];
extern u16 gFramebuffer1[SCREEN_HEIGHT][SCREEN_WIDTH]; // at 0x80000500
extern u8 D_80025D00[];

7
include/z64.h
View File

@ -513,6 +513,13 @@ typedef union {
F3DVertexNormal normal;
} F3DVertex; // size = 0x10
// End of RDRAM without the Expansion Pak installed
#define NORMAL_RDRAM_END 0x80400000
// End of RDRAM with the Expansion Pak installed
#define EXPANDED_RDRAM_END 0x80800000
// Address at the end of normal RDRAM after which is room for a screen buffer
#define FAULT_FB_ADDRESS (NORMAL_RDRAM_END - sizeof(u16[SCREEN_HEIGHT][SCREEN_WIDTH]))
typedef struct {
/* 0x00 */ u16* fb;
/* 0x04 */ u16 w;

6
spec
View File

@ -8860,14 +8860,16 @@ beginseg
name "memerrmsg"
compress
romalign 0x1000
include "build/baserom/memerrmsg.o"
include "build/assets/misc/memerrmsg/memerrmsg.o"
number 1
endseg
beginseg
name "locerrmsg"
compress
romalign 0x1000
include "build/baserom/locerrmsg.o"
include "build/assets/misc/locerrmsg/locerrmsg.o"
number 1
endseg
beginseg

1
src/boot_O2_g3/CIC6105.c
View File

@ -1,6 +1,5 @@
#include "prevent_bss_reordering.h"
#include "global.h"
#include "prevent_bss_reordering.h"
UNK_TYPE4 D_8009BE30;
UNK_TYPE4 D_8009BE34;

2
src/boot_O2_g3/fault.c
View File

@ -714,7 +714,7 @@ void Fault_CommitFB() {
osViSetYScale(1.0f);
osViSetMode(&osViModeNtscLan1);
osViSetSpecialFeatures(0x42); // gama_disable|dither_fliter_enable_aa_mode3_disable
osViBlack(0);
osViBlack(false);
if (sFaultContext->fb) {
fb = sFaultContext->fb;

2
src/boot_O2_g3/fault_drawer.c
View File

@ -5,7 +5,7 @@ extern const u32 sFaultDrawerFont[];
FaultDrawer* sFaultDrawContext = &sFaultDrawerStruct;
FaultDrawer sFaultDrawerDefault = {
(u16*)0x803DA800, // fb - TODO map out buffers in this region and avoid hard-coded pointer
(u16*)FAULT_FB_ADDRESS, // fb
SCREEN_WIDTH, // w
SCREEN_HEIGHT, // h
16, // yStart

18
src/boot_O2_g3/idle.c
View File

@ -19,11 +19,11 @@ OSMesgQueue gPiMgrCmdQ;
void Idle_ClearMemory(void* begin, void* end) {
if (begin < end) {
bzero(begin, (u32)end - (u32)begin);
bzero(begin, (uintptr_t)end - (uintptr_t)begin);
}
}
void Idle_InitFramebuffer(u32* ptr, u32 numBytes, u32 value) {
void Idle_InitFramebuffer(u32* ptr, size_t numBytes, u32 value) {
s32 temp = sizeof(u32);
while (numBytes) {
@ -36,7 +36,7 @@ void Idle_InitScreen(void) {
Idle_InitFramebuffer((u32*)gFramebuffer1, 0x25800, 0x00010001);
ViConfig_UpdateVi(0);
osViSwapBuffer(gFramebuffer1);
osViBlack(0);
osViBlack(false);
}
void Idle_InitMemory(void) {
@ -52,7 +52,7 @@ void Idle_InitCodeAndMemory(void) {
DmaRequest dmaReq;
OSMesgQueue queue;
OSMesg mesg;
u32 oldSize;
size_t oldSize;
osCreateMesgQueue(&queue, &mesg, 1);
@ -71,7 +71,7 @@ void Idle_InitCodeAndMemory(void) {
}
void Main_ThreadEntry(void* arg) {
StackCheck_Init(&sIrqMgrStackInfo, sIrqMgrStack, sIrqMgrStack + sizeof(sIrqMgrStack), 0, 256, "irqmgr");
StackCheck_Init(&sIrqMgrStackInfo, sIrqMgrStack, sIrqMgrStack + sizeof(sIrqMgrStack), 0, 0x100, "irqmgr");
IrqMgr_Init(&gIrqMgr, &sIrqMgrStackInfo, Z_PRIORITY_IRQMGR, 1);
DmaMgr_Start();
Idle_InitCodeAndMemory();
@ -87,15 +87,15 @@ void Idle_InitVideo(void) {
gViConfigYScale = 1.0;
switch (osTvType) {
case 1:
case OS_TV_NTSC:
D_8009B290 = 2;
gViConfigMode = osViModeNtscLan1;
break;
case 2:
case OS_TV_MPAL:
D_8009B290 = 30;
gViConfigMode = osViModeMpalLan1;
break;
case 0:
case OS_TV_PAL:
D_8009B290 = 44;
gViConfigMode = osViModeFpalLan1;
gViConfigYScale = 0.833f;
@ -108,7 +108,7 @@ void Idle_InitVideo(void) {
void Idle_ThreadEntry(void* arg) {
Idle_InitVideo();
osCreatePiManager(150, &gPiMgrCmdQ, sPiMgrCmdBuff, ARRAY_COUNT(sPiMgrCmdBuff));
StackCheck_Init(&sMainStackInfo, sMainStack, sMainStack + sizeof(sMainStack), 0, 1024, "main");
StackCheck_Init(&sMainStackInfo, sMainStack, sMainStack + sizeof(sMainStack), 0, 0x400, "main");
osCreateThread(&gMainThread, Z_THREAD_ID_MAIN, Main_ThreadEntry, arg, sMainStack + sizeof(sMainStack),
Z_PRIORITY_MAIN);
osStartThread(&gMainThread);

10
src/boot_O2_g3/viconfig.c
View File

@ -3,13 +3,13 @@
void ViConfig_UpdateVi(u32 mode) {
if (mode != 0) {
switch (osTvType) {
case 2:
case OS_TV_MPAL:
osViSetMode(&osViModeMpalLan1);
break;
case 0:
case OS_TV_PAL:
osViSetMode(&osViModePalLan1);
break;
case 1:
case OS_TV_NTSC:
default:
osViSetMode(&osViModeNtscLan1);
break;
@ -47,8 +47,8 @@ void ViConfig_UpdateVi(u32 mode) {
void ViConfig_UpdateBlack(void) {
if (gViConfigUseDefault != 0) {
osViBlack(1);
osViBlack(true);
} else {
osViBlack(0);
osViBlack(false);
}
}

20
src/boot_O2_g3/z_std_dma.c
View File

@ -9,12 +9,12 @@ OSMesg sDmaMgrMsgs[32];
OSThread sDmaMgrThread;
u8 sDmaMgrStack[0x500];
s32 DmaMgr_DMARomToRam(u32 rom, void* ram, size_t size) {
s32 DmaMgr_DMARomToRam(uintptr_t rom, void* ram, size_t size) {
OSIoMesg ioMsg;
OSMesgQueue queue;
OSMesg msg[1];
s32 ret;
u32 buffSize = sDmaMgrDmaBuffSize;
size_t buffSize = sDmaMgrDmaBuffSize;
osInvalDCache(ram, size);
osCreateMesgQueue(&queue, msg, ARRAY_COUNT(msg));
@ -23,7 +23,7 @@ s32 DmaMgr_DMARomToRam(u32 rom, void* ram, size_t size) {
while (buffSize < size) {
ioMsg.hdr.pri = 0;
ioMsg.hdr.retQueue = &queue;
ioMsg.devAddr = (u32)rom;
ioMsg.devAddr = rom;
ioMsg.dramAddr = ram;
ioMsg.size = buffSize;
ret = osEPiStartDma(gCartHandle, &ioMsg, 0);
@ -39,9 +39,9 @@ s32 DmaMgr_DMARomToRam(u32 rom, void* ram, size_t size) {
}
ioMsg.hdr.pri = 0;
ioMsg.hdr.retQueue = &queue;
ioMsg.devAddr = (u32)rom;
ioMsg.devAddr = rom;
ioMsg.dramAddr = ram;
ioMsg.size = (u32)size;
ioMsg.size = size;
ret = osEPiStartDma(gCartHandle, &ioMsg, 0);
if (ret) {
goto END;
@ -109,11 +109,11 @@ const char* func_800809F4(u32 a0) {
}
void DmaMgr_ProcessMsg(DmaRequest* req) {
u32 vrom;
uintptr_t vrom;
void* ram;
size_t size;
u32 romStart;
u32 romSize;
uintptr_t romStart;
size_t romSize;
DmaEntry* dmaEntry;
s32 index;
@ -172,7 +172,7 @@ void DmaMgr_ThreadEntry(void* a0) {
}
}
s32 DmaMgr_SendRequestImpl(DmaRequest* request, void* vramStart, u32 vromStart, size_t size, UNK_TYPE4 unused,
s32 DmaMgr_SendRequestImpl(DmaRequest* request, void* vramStart, uintptr_t vromStart, size_t size, UNK_TYPE4 unused,
OSMesgQueue* queue, OSMesg msg) {
if (gIrqMgrResetStatus >= 2) {
return -2;
@ -190,7 +190,7 @@ s32 DmaMgr_SendRequestImpl(DmaRequest* request, void* vramStart, u32 vromStart,
return 0;
}
s32 DmaMgr_SendRequest0(void* vramStart, u32 vromStart, size_t size) {
s32 DmaMgr_SendRequest0(void* vramStart, uintptr_t vromStart, size_t size) {
DmaRequest req;
OSMesgQueue queue;
OSMesg msg[1];

115
src/code/sys_initial_check.c
View File

@ -1,17 +1,116 @@
/**
* File: sys_initial_check.c
* Description: Functions for checking for the presence of the Expansion Pak and the correct TV type (PAL/NTSC/MPAL),
* and functions for printing error messages directly to screen if not found or incorrect.
*
* These checks are some of the first functions run in Main, before even setting up the system heap, and any image files
* are DMA'd directly to fixed RAM addresses.
*/
#include "global.h"
#include "misc/locerrmsg/locerrmsg.h"
#include "misc/memerrmsg/memerrmsg.h"
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_WriteRGBA16Pixel.s")
#define SIZEOF_LOCERRMSG (sizeof(gNotDesignedForSystemErrorTex))
#define SIZEOF_MEMERRMSG (sizeof(gExpansionPakNotInstalledErrorTex) + sizeof(gSeeInstructionBookletErrorTex))
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_WriteI4Pixel.s")
// Address with enough room after to load either of the error message image files before the fault screen buffer at the
// end of RDRAM
#define CHECK_ERRMSG_STATIC_SEGMENT (u8*)(FAULT_FB_ADDRESS - MAX(SIZEOF_LOCERRMSG, SIZEOF_MEMERRMSG))
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_DrawI4Texture.s")
void Check_WriteRGBA16Pixel(u16* buffer, u32 x, u32 y, u32 value) {
if (value & RGBA16_PIXEL_OPAQUE) {
(&buffer[x])[y * SCREEN_WIDTH] = value;
}
}
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_ClearRGBA16.s")
void Check_WriteI4Pixel(u16* buffer, u32 x, u32 y, u32 value) {
Check_WriteRGBA16Pixel(buffer, x, y, value * GPACK_RGBA5551(16, 16, 16, 0) + GPACK_RGBA5551(12, 12, 12, 1));
}
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_DrawExpansionPakErrorMessage.s")
/**
* x and y are the coordinates of the bottom-left corner.
*/
void Check_DrawI4Texture(u16* buffer, s32 x, s32 y, s32 width, s32 height, u8* texture) {
s32 v;
s32 u;
u8 pixelPair;
u8* pixelPairPtr = texture;
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_DrawRegionLockErrorMessage.s")
// I4 textures are bitpacked 2 pixels per byte, so this writes a pair of pixels in each iteration using bitmasking.
for (v = 0; v < height; v++) {
for (u = 0; u < width; u += 2, pixelPairPtr++) {
pixelPair = *pixelPairPtr;
Check_WriteI4Pixel(buffer, x + u, y + v, pixelPair >> 4);
pixelPair = *pixelPairPtr;
Check_WriteI4Pixel(buffer, x + u + 1, y + v, pixelPair & 0xF);
}
}
}
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_ExpansionPak.s")
void Check_ClearRGBA16(u16* buffer) {
u32 x;
u32 y;
#pragma GLOBAL_ASM("asm/non_matchings/code/sys_initial_check/Check_RegionIsSupported.s")
for (y = 0; y < SCREEN_HEIGHT; y++) {
for (x = 0; x < SCREEN_WIDTH; x++) {
Check_WriteRGBA16Pixel(buffer, x, y, 1);
}
}
}
/**
* Draw error message textures directly to a screen buffer at the end of normal RDRAM
*/
void Check_DrawExpansionPakErrorMessage(void) {
DmaMgr_SendRequest0(CHECK_ERRMSG_STATIC_SEGMENT, SEGMENT_ROM_START(memerrmsg), SEGMENT_SIZE(memerrmsg));
Check_ClearRGBA16((u16*)FAULT_FB_ADDRESS);
Check_DrawI4Texture((u16*)FAULT_FB_ADDRESS, 96, 71, 128, 37, CHECK_ERRMSG_STATIC_SEGMENT);
Check_DrawI4Texture((u16*)FAULT_FB_ADDRESS, 96, 127, 128, 37,
CHECK_ERRMSG_STATIC_SEGMENT + sizeof(gExpansionPakNotInstalledErrorTex));
osWritebackDCacheAll();
osViSwapBuffer((u16*)FAULT_FB_ADDRESS);
osViBlack(false);
}
/**
* Draw error message texture directly to a screen buffer at the end of normal RDRAM
*/
void Check_DrawRegionLockErrorMessage(void) {
DmaMgr_SendRequest0(CHECK_ERRMSG_STATIC_SEGMENT, SEGMENT_ROM_START(locerrmsg), SEGMENT_SIZE(locerrmsg));
Check_ClearRGBA16((u16*)FAULT_FB_ADDRESS);
Check_DrawI4Texture((u16*)FAULT_FB_ADDRESS, 56, 112, 208, 16, CHECK_ERRMSG_STATIC_SEGMENT);
osWritebackDCacheAll();
osViSwapBuffer((u16*)FAULT_FB_ADDRESS);
osViBlack(false);
}
/**
* If Expansion pak is not installed, display error message until console is turned off
*/
void Check_ExpansionPak(void) {
// Expansion pak installed
if (osMemSize >= 0x800000) {
return;
}
Check_DrawExpansionPakErrorMessage();
osDestroyThread(NULL);
while (true) {}
}
/**
* If region is not NTSC or MPAL, display error message until console is turned off
*/
void Check_RegionIsSupported(void) {
s32 regionSupported = false;
if ((osTvType == OS_TV_NTSC) || (osTvType == OS_TV_MPAL)) {
regionSupported = true;
}
if (!regionSupported) {
Check_DrawRegionLockErrorMessage();
osDestroyThread(NULL);
while (true) {}
}
}

2
src/libultra/io/viblack.c
View File

@ -8,7 +8,7 @@ void osViBlack(u8 active) {
if (active) {
__osViNext->state |= 0x20;
} else {
__osViNext->state &= 0xffdf;
__osViNext->state &= ~0x20;
}
__osRestoreInt(saveMask);

39
src/libultra/io/visetspecial.c
View File

@ -3,34 +3,33 @@
void osViSetSpecialFeatures(u32 func) {
register u32 saveMask = __osDisableInt();
if (func & 1) {
__osViNext->features |= 8;
if (func & OS_VI_GAMMA_ON) {
__osViNext->features |= OS_VI_GAMMA;
}
if (func & 2) {
__osViNext->features &= ~8;
if (func & OS_VI_GAMMA_OFF) {
__osViNext->features &= ~OS_VI_GAMMA;
}
if (func & 4) {
__osViNext->features |= 4;
if (func & OS_VI_GAMMA_DITHER_ON) {
__osViNext->features |= OS_VI_GAMMA_DITHER;
}
if (func & 8) {
if (func & OS_VI_GAMMA_DITHER_OFF) {
__osViNext->features &= ~OS_VI_GAMMA_DITHER;
}
if (func & OS_VI_DIVOT_ON) {
__osViNext->features &= ~4;
__osViNext->features |= OS_VI_DIVOT;
}
if (func & 0x10) {
if (func & OS_VI_DIVOT_OFF) {
__osViNext->features |= 0x10;
__osViNext->features &= ~OS_VI_DIVOT;
}
if (func & 0x20) {
__osViNext->features &= ~0x10;
if (func & OS_VI_DITHER_FILTER_ON) {
__osViNext->features |= OS_VI_DITHER_FILTER;
__osViNext->features &= ~(OS_VI_UNK100 | OS_VI_UNK200);
}
if (func & 0x40) {
__osViNext->features |= 0x10000;
__osViNext->features &= ~0x300;
}
if (func & 0x80) {
__osViNext->features &= ~0x10000;
__osViNext->features |= __osViNext->modep->comRegs.ctrl & 0x300;
if (func & OS_VI_DITHER_FILTER_OFF) {
__osViNext->features &= ~OS_VI_DITHER_FILTER;
__osViNext->features |= __osViNext->modep->comRegs.ctrl & (OS_VI_UNK100 | OS_VI_UNK200);
}
__osViNext->state |= 8;