| 1 |
ORG 100H |
| 2 |
USE16 |
| 3 |
|
| 4 |
include 'CONSTS.ASM' |
| 5 |
include 'OBJTYPES.ASM' |
| 6 |
|
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; Unholy hack to reduce the amount of memory we get for the program because DOS is a big dum-dum and allocates the entire |
| 8 |
; free memory space, despite the fact that the program can only be up to 64K in size |
| 9 |
MOV BX, 0x800 ; 32K (in paragraphs) NOTE: If this is not enough, the program will eventually crash when it gets bigger |
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; Take great care to synchronize that with the .COM executable size!!!!!!!!!!!!!! |
| 11 |
MOV AH, 4Ah ; MODIFY MEMORY BLOCK |
| 12 |
INT 21h ; Me when Interrupt 21H (Disk Operating System Kernel Interrupt) [Real] |
| 13 |
JC ERROR_GeneralDOSError ; Balls |
| 14 |
|
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MOV DX, Filename |
| 16 |
CALL DOS_OpenReadonly |
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JC ERROR_FileError ; Carry set means an error |
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; If the branch was not taken, AX has the file handle. |
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; We just store it in RAM for later since it's going to be useful for pretty much the entire runtime of the program |
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MOV [GameFileHandle], AX |
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|
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; 1 Para = 16B |
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|
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MOV BX, 1024 ; 16K |
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CALL DOS_AllocateMemory ; Allocate scratch RAM |
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JC ERROR_GeneralDOSError |
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MOV [RAM_Scratch], AX |
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|
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MOV BX, 256 ; 4K again |
| 30 |
CALL DOS_AllocateMemory ; Allocate persistent RAM |
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JC ERROR_GeneralDOSError |
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MOV [RAM_Persistent], AX |
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|
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MOV BX, 4096 ; Full 64K segment |
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CALL DOS_AllocateMemory ; Allocate object RAM |
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JC ERROR_GeneralDOSError |
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MOV [RAM_Object], AX |
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|
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MOV BX, 4096 ; Full 64K segment |
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CALL DOS_AllocateMemory ; Allocate the frame buffer |
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JC ERROR_GeneralDOSError |
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MOV [RAM_Framebuffer], AX |
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|
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MOV ES, [RAM_Scratch] |
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|
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; Allocated segment in ES |
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|
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MOV BX, [GameFileHandle] ; File handle |
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MOV CX, 4 ; Number of bytes to read |
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MOV DX, 0 ; Offset into the buffer |
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CALL DOS_ReadFileIntoES ; Does the PUSH DS POP DS shenanigans |
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JC ERROR_GeneralDOSError ; If CF then error |
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|
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; Does not mess with BX, and we still need BX for the handle. |
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CALL BASE_VerifyGameFileMagic |
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|
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MOV CX, 2 |
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XOR DX, DX |
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CALL DOS_ReadFileIntoES ; Read a single byte indicating the version, and then one about how much memory to allocate, 0 is 16K, 1 is 32K, 2 is 64K |
| 60 |
JC ERROR_GeneralDOSError |
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|
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; Check the file version. Valid values are 1 and... well, just 1. |
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A_CheckVer: |
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MOV AL, [ES:0] |
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CMP AL, 1 |
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JE .goodver |
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MOV DX, STR_ErrInvalidVersion |
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CALL DOS_PrintString |
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JMP Exit |
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.goodver: |
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|
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; Read how much memory we want to allocate (0, 1, or 2 for 16, 32, and 64K respectively), allocate it, and store the segment |
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MOV AL, [ES:1] |
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CALL BASE_AllocFileMem |
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MOV [RAM_OpFile], AX |
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|
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MOV BX, [GameFileHandle] ; We probably lost BX long ago |
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MOV CX, 0xFFFF ; Read everything to end |
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MOV ES, [RAM_OpFile] ; Store the entire file in its alloc'd memory |
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XOR DX, DX ; Starting at offset 0 in ES:DX |
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CALL DOS_ReadFileIntoES |
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JC ERROR_GeneralDOSError |
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|
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MOV [FilePtr], 0 ; Reset the file pointer to 0, this is our "program counter" |
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|
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MOV CX, 3600 ; Object count, 3600 JUST fits, any more and we're out of memory |
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MOV ES, [RAM_Object] |
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CALL TABLE_InitializeBitmap |
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|
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CALL BIOS_SetVideoMode13H |
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|
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MOV DX, MyBmpFn |
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CALL BASE_AllocLoadFile ; ES:0 = Loaded file |
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MOV [BitmapSeg], ES |
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|
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MOV DX, MyBmpFn1 |
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CALL BASE_AllocLoadFile ; ES:0 = Loaded file |
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MOV [BitmapSeg1], ES |
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|
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|
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MOV ES, [RAM_Object] |
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|
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MOV CX, 1 |
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CALL TABLE_ObjAlloc |
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|
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; AX Has obj h |
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CALL TABLE_ObjFree |
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|
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MOV CX, 1 |
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CALL TABLE_ObjAlloc |
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PUSH AX |
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MOV CX, 1 |
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CALL TABLE_ObjAlloc |
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CALL TABLE_GetObjectAddr |
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MOV WORD [ES:DI], 0xEFBE |
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|
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;POP AX |
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;MOV SI, TestStr |
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;CALL OBJ_STRING_FillString |
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|
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;JMP $ |
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|
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;TestStr db 'According to all known laws of aviation, there is no way a bee should be able to fly.', 0 |
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|
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;JMP $ |
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|
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NewTestDrwLoop: |
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MOV AL, 0x01 ; Blue |
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CALL BASE_ClearScreen |
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|
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MOV ES, [BitmapSeg] |
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XOR SI, SI |
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MOV CX, [XPos] ; X |
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MOV DX, [YPos] ; Y |
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CALL BASE_DrawBitmapFromFile |
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ADD [XPos], 1 |
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|
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;MOV ES, [BitmapSeg1] |
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;XOR SI, SI |
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;MOV CX, [XPos1] ; X |
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;MOV DX, [YPos1] ; Y |
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;CALL BASE_DrawBitmapFromFile |
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;SUB [XPos1], 1 |
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|
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CALL BASE_Present |
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JMP NewTestDrwLoop |
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|
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BitmapSeg dw ? |
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BitmapSeg1 dw ? |
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MyBmpFn db 'WIDE.BMA', 0x00 |
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MyBmpFn1 db 'BMPMOON.BMA', 0x00 |
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XPos dw 0 |
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YPos dw 0 |
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XPos1 dw 0 |
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YPos1 dw 0 |
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|
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JMP $ |
| 158 |
CALL BIOS_SetVideoMode03H ; If Exit is called, the mode is likely already 03H, and we don't want to clear the framebuffer, which this does |
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Exit: |
| 160 |
|
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MOV BX, [GameFileHandle] |
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CALL DOS_CloseFile |
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JC FileCloseError |
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|
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; Free all memory blocks |
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; We use CX to see whether the carry has been set within one or more calls, since we want to continue even if there was an error |
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; So we just use ADC CX, 0 to add the carry to CX, if CF = 0, CX = 0 |
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CLC |
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XOR CX, CX |
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|
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MOV ES, [RAM_Scratch] |
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CALL DOS_FreeMemory |
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ADC CX, 0 |
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|
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MOV ES, [RAM_Persistent] |
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CALL DOS_FreeMemory |
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ADC CX, 0 |
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|
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MOV ES, [RAM_Object] |
| 180 |
CALL DOS_FreeMemory |
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ADC CX, 0 |
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|
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MOV ES, [RAM_OpFile] |
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CALL DOS_FreeMemory |
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ADC CX, 0 |
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|
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CMP CX, 0 |
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JE .noerror |
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|
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MOV DX, STR_ErrFree |
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CALL DOS_PrintString |
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.noerror: |
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|
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MOV DX, STR_Bye |
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CALL DOS_PrintString |
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|
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; CALL BIOS_SetVideoMode03H ; Fix the video mode |
| 198 |
INT 20H ; ENDOF Program |
| 199 |
|
| 200 |
include 'ERRORS.ASM' |
| 201 |
include 'DOSFUNC.ASM' |
| 202 |
include 'BIOSFUNC.ASM' |
| 203 |
include 'BASEFUNC.ASM' |
| 204 |
include 'HEAPUTIL.ASM' |
| 205 |
include 'OBJUTILS.ASM' |
| 206 |
include 'STATVAR.ASM' |
