83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
//
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// ID_PM.H
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// Header file for Id Engine's Page Manager
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//
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// NOTE! PMPageSize must be an even divisor of EMSPageSize, and >= 1024
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#define EMSPageSize 16384
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#define EMSPageSizeSeg (EMSPageSize >> 4)
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#define EMSPageSizeKB (EMSPageSize >> 10)
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#define EMSFrameCount 4
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#define PMPageSize 4096
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#define PMPageSizeSeg (PMPageSize >> 4)
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#define PMPageSizeKB (PMPageSize >> 10)
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#define PMEMSSubPage (EMSPageSize / PMPageSize)
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#define PMMinMainMem 10 // Min acceptable # of pages from main
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#define PMMaxMainMem 100 // Max number of pages in main memory
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#define PMThrashThreshold 1 // Number of page thrashes before panic mode
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#define PMUnThrashThreshold 5 // Number of non-thrashing frames before leaving panic mode
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typedef enum
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{
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pml_Unlocked,
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pml_Locked
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} PMLockType;
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typedef enum
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{
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pmba_Unused = 0,
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pmba_Used = 1,
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pmba_Allocated = 2
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} PMBlockAttr;
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typedef struct
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{
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longword offset; // Offset of chunk into file
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word length; // Length of the chunk
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int xmsPage; // If in XMS, (xmsPage * PMPageSize) gives offset into XMS handle
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PMLockType locked; // If set, this page can't be purged
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int emsPage; // If in EMS, logical page/offset into page
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int mainPage; // If in Main, index into handle array
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longword lastHit; // Last frame number of hit
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} PageListStruct;
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typedef struct
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{
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int baseEMSPage; // Base EMS page for this phys frame
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longword lastHit; // Last frame number of hit
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} EMSListStruct;
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extern boolean XMSPresent,EMSPresent;
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extern word XMSPagesAvail,EMSPagesAvail;
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extern word ChunksInFile,
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PMSpriteStart,PMSoundStart;
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extern PageListStruct far *PMPages;
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#define PM_GetSoundPage(v) PM_GetPage(PMSoundStart + (v))
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#define PM_GetSpritePage(v) PM_GetPage(PMSpriteStart + (v))
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#define PM_LockMainMem() PM_SetMainMemPurge(0)
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#define PM_UnlockMainMem() PM_SetMainMemPurge(3)
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extern char PageFileName[13];
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extern void PM_Startup(void),
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PM_Shutdown(void),
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PM_Reset(void),
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PM_Preload(boolean (*update)(word current,word total)),
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PM_NextFrame(void),
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PM_SetPageLock(int pagenum,PMLockType lock),
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PM_SetMainPurge(int level),
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PM_CheckMainMem(void);
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extern memptr PM_GetPageAddress(int pagenum),
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PM_GetPage(int pagenum); // Use this one to cache page
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void PM_SetMainMemPurge(int level);
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