475 lines
10 KiB
Org Mode
475 lines
10 KiB
Org Mode
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.386
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.MODEL small
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SKIPPRIMITIVES = 0 ; set to 1 to skip unwound drawing
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INCLUDE viewsize.inc
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INCLUDE macros.inc
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SCREEN = 0a0000h
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SCREENWIDTH = 320
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PEL_WRITE_ADR = 03c8h
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PEL_DATA = 03c9h
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.DATA
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EXTRN viewbuffer:WORD
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EXTRN viewLocation:DWORD
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EXTRN windowWidth:DWORD
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EXTRN windowHeight:DWORD
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.CODE
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;============================================================================
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;
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; Fixed point math
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;
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;============================================================================
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@Proc FIXEDMUL, <>, <<op1,DWORD>,<op2,DWORD>>
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mov eax,op1
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imul [op2]
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shrd eax,edx,16
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@exitp <>
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ENDP
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@Proc FIXEDDIV, <>, <<op1,DWORD>,<op2,DWORD>>
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mov eax,op1
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cdq
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shld edx,eax,16
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sal eax,16
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idiv [op2]
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@exitp <>
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ENDP
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;============================================================================
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;
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; RF_BlitView
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;
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;============================================================================
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@Proc RF_BlitView, <ebx, esi, edi>
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mov esi,OFFSET viewbuffer
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mov edi,[viewLocation]
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mov ebx,[windowHeight]
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mov eax,SCREENWIDTH
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sub eax,[windowWidth]
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mov edx,eax
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mov eax,[windowWidth]
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shr eax,2
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ALIGN 4
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@@blitloop1:
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mov ecx,eax
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rep movsd
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add edi,edx
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dec ebx
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jnz @@blitloop1
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@exitp <ebx, esi, edi>
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ENDP
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;============================================================================
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;
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; Merge
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;
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; merge two parts of the unsorted array to the sorted array
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;
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;============================================================================
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.DATA
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EXTRN src1:DWORD
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EXTRN src2:DWORD
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EXTRN dest:DWORD
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EXTRN size1:DWORD
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EXTRN size2:DWORD
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PUBLIC mergefrom1
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PUBLIC finishfrom1
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PUBLIC mergefrom2
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PUBLIC finishfrom2
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PUBLIC mergedone
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.CODE
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@Proc Merge, <ebx,esi,edi>
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mov ebx,[src1]
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mov esi,[src2]
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mov edi,[dest]
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mov ecx,[size1]
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mov edx,[size2]
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mov eax,[ebx]
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cmp eax,[esi]
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jb SHORT mergefrom2 ; if (*src1 < *src2) goto mergefrom2;
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mergefrom1:
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stosd
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add ebx,4 ; *dest++ = *src1++;
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mov eax,[ebx]
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dec ecx
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jz finishfrom2 ; if (!--size1) goto finishfrom2;
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cmp eax,[esi]
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ja SHORT mergefrom1 ; if (*src1 > *src2) goto mergefrom1;
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mergefrom2:
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movsd ; *dest++ = *src2++;
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dec edx
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jz finishfrom1 ; if (!--size2) goto finishfrom1;
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cmp eax,[esi]
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ja SHORT mergefrom1 ; if (*src1 > *src2) goto mergefrom1;
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jmp SHORT mergefrom2
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ALIGN 4
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finishfrom2:
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movsd ; *dest++ = *src2++;
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dec edx ; while (size2--)
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jnz SHORT finishfrom2
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jmp SHORT mergedone
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ALIGN 4
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finishfrom1:
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stosd
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add ebx,4 ; *dest++ = *src1++;
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mov eax,[ebx]
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loop SHORT finishfrom1 ; while (size1--)
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mergedone:
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mov [dest],edi
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@exitp <ebx, esi, edi>
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ENDP
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;============================================================================
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;
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; unwound vertical scaling code
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;
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; eax light table pointer, 0 lowbyte overwritten
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; ebx all 0, low byte overwritten
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; ecx fractional step value
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; edx fractional scale value
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; esi start of source pixels
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; edi bottom pixel in screenbuffer to blit into
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;
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; ebx should be set to 0 0 0 dh to feed the pipeline
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;============================================================================
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SCALELABEL MACRO number
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vscale&number:
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ENDM
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LINE = MAXWINDOWHEIGHT
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REPT MAXWINDOWHEIGHT-1
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SCALELABEL %LINE
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mov al,[esi+ebx] ; get source pixel
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add edx,ecx ; calculate next location
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mov al,[eax] ; translate the color
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xor ebx,ebx
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shld ebx,edx,16 ; get address of next location
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mov [edi-(LINE-1)*MAXWINDOWWIDTH],al ; draw a pixel to the buffer
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LINE = LINE-1
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ENDM
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vscale1:
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mov al,[esi+ebx]
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add edx,ecx
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mov al,[eax]
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mov [edi],al
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vscale0:
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ret
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.DATA
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SCALEDEFINE MACRO number
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dd vscale&number
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ENDM
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ALIGN 4
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scalecalls LABEL
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LINE = 0
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REPT MAXWINDOWHEIGHT+1
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SCALEDEFINE %LINE
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LINE = LINE+1
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ENDM
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PUBLIC scalecalls
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;=================================================
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;
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; parameters for RN_ScalePost
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;
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sp_dest dd 0
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sp_count dd 0
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sp_fracstep dd 0
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sp_frac dd 0
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sp_source dd 0
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sp_colormap dd 0
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PUBLIC sp_dest, sp_count, sp_fracstep, sp_frac, sp_source, sp_colormap
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.CODE
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;================
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;
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; ScalePost
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;
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;================
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@Proc ScalePost, <ebx, esi, edi, ebp>
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IFE SKIPPRIMITIVES
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mov edx,[sp_frac]
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mov ecx,[sp_fracstep]
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mov esi,[sp_source]
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mov eax,[sp_colormap]
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mov edi,[sp_dest]
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xor ebx,ebx
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shld ebx,edx,16 ; get address of first location
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mov ebp,[sp_count]
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call [scalecalls+ebp*4]
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ENDIF
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@exitp <ebx, esi, edi, ebp>
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ENDP
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;============================================================================
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;
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; unwound masked vertical scaling code
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;
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; eax light table pointer, 0 lowbyte overwritten
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; ebx all 0, low byte overwritten
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; ecx all 0, low byte overwritten
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; edx fractional scale value
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; esi start of source pixels
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; edi bottom pixel in screenbuffer to blit into
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; ebp fractional step value
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;
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; ebx should be set to 0 0 0 dh to feed the pipeline
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;============================================================================
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ALIGN 4
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MSCALELABEL MACRO number
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mvscale&number:
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ENDM
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LINE = MAXWINDOWHEIGHT
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REPT MAXWINDOWHEIGHT-1
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MSCALELABEL %LINE
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mov al,[esi+ebx] ; get source pixel
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add edx,ebp ; calculate next location
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mov cl,al ; save original color for jcxz
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mov al,[eax] ; translate the color
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xor ebx,ebx
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shld ebx,edx,16 ; get address of next location
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jcxz $+9
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mov [edi-(LINE-1)*MAXWINDOWWIDTH],al ; draw a pixel to the buffer
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LINE = LINE-1
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ENDM
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mvscale1:
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mov al,[esi+ebx]
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add edx,ecx
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mov al,[eax]
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test al,0
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jz mvscale0
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mov [edi],al
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mvscale0:
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ret
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.DATA
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MSCALEDEFINE MACRO number
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dd mvscale&number
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ENDM
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ALIGN 4
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mscalecalls LABEL
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LINE = 0
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REPT MAXWINDOWHEIGHT+1
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MSCALEDEFINE %LINE
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LINE = LINE+1
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ENDM
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PUBLIC mscalecalls
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mscalecall dd 0
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.CODE
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;================
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;
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; ScaleMaskedPost
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;
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; Same parameters as ScalePost, but 0 pixels are not drawn
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;
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;================
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@Proc ScaleMaskedPost, <ebx, esi, edi, ebp>
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IFE SKIPPRIMITIVES
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mov ebp,[sp_count]
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mov eax,[mscalecalls+ebp*4]
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mov [mscalecall],eax
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mov edx,[sp_frac]
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mov ebp,[sp_fracstep]
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mov esi,[sp_source]
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mov eax,[sp_colormap]
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mov edi,[sp_dest]
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xor ebx,ebx
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xor ecx,ecx
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shld ebx,edx,16 ; get address of first location
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call [mscalecall]
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ENDIF
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@exitp <ebx, esi, edi, ebp>
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ENDP
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;============================================================================
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;
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; unwound horizontal texture mapping code
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;
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; eax lighttable
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; ebx xtotal 6 bits units 26 bits frac
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; ecx ytotal 6 bits units 26 bits frac
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; edx xstep
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; esi start of block
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; edi dest
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; ebp scratch offset
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;
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; [ystep]
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;
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; ebp should by preset from ebx / ecx before calling
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;============================================================================
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MAPLABEL MACRO number
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hmap&number:
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ENDM
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LINE = MAXWINDOWWIDTH
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REPT MAXWINDOWWIDTH
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MAPLABEL %LINE
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mov al,[esi+ebp] ; get source pixel
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add ebx,edx ; xtotal += xstep
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add ecx,[ystep] ; ytotal += ystep
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xor ebp,ebp
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mov al,[eax] ; translate color
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shld ebp,ecx,6 ; shift in new y/x position
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shld ebp,ebx,6
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mov [edi-(LINE-1)],al ; write pixel
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LINE = LINE-1
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ENDM
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hmap0:
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ret
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.DATA
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ystep dd 0
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MAPDEFINE MACRO number
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dd hmap&number
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ENDM
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ALIGN 4
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mapcalls LABEL
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LINE = 0
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REPT MAXWINDOWWIDTH+1
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MAPDEFINE %LINE
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LINE = LINE+1
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ENDM
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PUBLIC mapcalls
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mapcall dd 0
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;
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; parameters for RN_MapLine
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;
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mr_dest dd 0 ; pointer to first pixel in view buffer
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mr_count dd 0
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mr_picture dd 0 ; pointer to 4096 pixel block
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mr_colormap dd 0 ; page aligned light table
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mr_xfrac dd 0 ; 16 frac bits
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mr_yfrac dd 0 ; 16 frac bits
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mr_xstep dd 0
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mr_ystep dd 0
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PUBLIC mr_dest,mr_picture,mr_colormap,mr_xfrac,mr_yfrac,mr_xstep,mr_ystep,mr_count
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.CODE
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;================
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;
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; MapRow
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;
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; Horizontal texture mapping
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;
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;================
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@Proc MapRow, <ebx, esi, edi>
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IFE SKIPPRIMITIVES
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mov eax,[mr_count]
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|
|
mov ebx,[mapcalls+eax*4]
|
||
|
|
mov [mapcall],ebx ; spot to jump into unwound
|
||
|
|
|
||
|
|
mov edi,[mr_dest]
|
||
|
|
add edi,[mr_count]
|
||
|
|
dec edi
|
||
|
|
|
||
|
|
mov eax,[mr_ystep]
|
||
|
|
shl eax,10
|
||
|
|
mov [ystep],eax
|
||
|
|
|
||
|
|
mov eax,[mr_colormap]
|
||
|
|
mov ebx,[mr_xfrac]
|
||
|
|
shl ebx,10
|
||
|
|
mov ecx,[mr_yfrac]
|
||
|
|
shl ecx,10
|
||
|
|
mov edx,[mr_xstep]
|
||
|
|
shl edx,10
|
||
|
|
mov esi,[mr_picture]
|
||
|
|
|
||
|
|
|
||
|
|
xor ebp,ebp
|
||
|
|
shld ebp,ecx,6
|
||
|
|
shld ebp,ebx,6 ; do first step for pipeline
|
||
|
|
|
||
|
|
call [mapcall]
|
||
|
|
|
||
|
|
shr ebx,10
|
||
|
|
mov [mr_xfrac],ebx
|
||
|
|
shr ecx,10
|
||
|
|
mov [mr_yfrac],ecx
|
||
|
|
|
||
|
|
ENDIF
|
||
|
|
|
||
|
|
@exitp <ebx, esi, edi>
|
||
|
|
ENDP
|
||
|
|
|
||
|
|
END
|