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  1. seg000:E8AB draw_sprite_whiteflash proc near        ; CODE XREF: draw_sprite_list+AEp
  2. seg000:E8AB                                         ; DATA XREF: draw_sprite_list:loc_E462o
  3. seg000:E8AB
  4. seg000:E8AB ; FUNCTION CHUNK AT seg000:E8A8 SIZE 00000003 BYTES
  5. seg000:E8AB ; FUNCTION CHUNK AT seg000:EBE4 SIZE 00000137 BYTES
  6. seg000:E8AB
  7. seg000:E8AB                 mov     dx, 3CEh
  8. seg000:E8AE                 mov     ax, 1003h       ; Set Logical OP of Data Rotate Reg. to OR
  9. seg000:E8B1                 out     dx, ax          ; EGA: graph 1 and 2 addr reg:
  10. seg000:E8B1                                         ; unknown register
  11. seg000:E8B2                 mov     dx, bx          ; dx = starting byte in scanline
  12. seg000:E8B4                 sar     dx, 1
  13. seg000:E8B6                 sar     dx, 1
  14. seg000:E8B8                 sar     dx, 1
  15. seg000:E8BA                 mov     ax, es:word_0   ; al = Flags, ah = sprite height (this is used later!!)
  16. seg000:E8BE                 test    al, 40h
  17. seg000:E8C0                 jnz     short loc_E8A8
  18. seg000:E8C2                 shl     di, 1           ; Non-0x40 sprite
  19. seg000:E8C2                                         ; Set si to the proper shift
  20. seg000:E8C4                 add     dx, ylookup[di] ; dx = offset from VGA start address
  21. seg000:E8C8                 cmp     al, 1
  22. seg000:E8CA                 jbe     short loc_E922
  23. seg000:E8CC                 cmp     al, 2
  24. seg000:E8CE                 jz      short loc_E916
  25. seg000:E8D0                 cmp     al, 4
  26. seg000:E8D2                 jz      short loc_E91D
  27. seg000:E8D4                 and     bx, 7           ; flags & 0x8 -> eight shifts (pixel smoothness)
  28. seg000:E8D7                 shl     bx, 1
  29. seg000:E8D9
  30. seg000:E8D9 loc_E8D9:                               ; CODE XREF: draw_sprite_whiteflash+70j
  31. seg000:E8D9                                         ; draw_sprite_whiteflash+75j
  32. seg000:E8D9                 mov     si, es:[bx+(size sprite)] ; for 2, 4, or 8 shifts, going the source planes
  33. seg000:E8D9                                         ; are arranged in order of shift amount
  34. seg000:E8DD                 mov     cl, 0
  35.  
  36.  
  37. seg000:E8DF do_planeBits:                           ; CODE XREF: draw_sprite_whiteflash+8Fj
  38. seg000:E8DF                 lods    byte ptr es:[si] ; get the first byte of the plane (i.e., the planeBits), which
  39. seg000:E8DF                                         ; determines to which planes data should be written
  40. seg000:E8E1                 xchg    ax, bx          ; bl = planeBits; bh = sprite height (from function start)
  41. seg000:E8E1                                         ; al = Bytes per plane, if it's bit-1 image
  42. seg000:E8E2                 lds     di, page_1_address
  43. seg000:E8E6                 add     di, dx          ; di = offset from start addres
  44. seg000:E8E8                 mov     word ptr [bp+sprite_drawstruct.planeBits], bx
  45. seg000:E8EB                 add     dx, ss:page_2_offset
  46. seg000:E8F0                 mov     [bp+sprite_drawstruct.page2_offset], dx
  47. seg000:E8F3                 mov     [bp+sprite_drawstruct.page1_offset], di
  48. seg000:E8F6                 mov     ch, bh
  49. seg000:E8F8                 mov     dl, ch          ; dl = ch = sprite height
  50. seg000:E8FA                 xor     dh, dh
  51. seg000:E8FC                 xor     bh, bh
  52. seg000:E8FE                 shl     bx, 1           ; Jump to plane-bit dependent drawing code
  53. seg000:E900                 and     cl, 7           ; cl = left edge of sprite x-coord MOD 8
  54. seg000:E903                 jz      short draw_left_aligned
  55. seg000:E905
  56. seg000:E905 draw_non_left_aligned:                  ; draw sprite where dest is
  57. seg000:E905                 mov     [bp+sprite_drawstruct.planeBits], al ; not aligned on a byte boundary
  58. seg000:E908                 mov     bp, di
  59. seg000:E90A                 jmp     word ptr cs:off_E888[bx-2]
  60. seg000:E90F ; ---------------------------------------------------------------------------
  61. seg000:E90F
  62. seg000:E90F draw_left_aligned:                      ; CODE XREF: draw_sprite_whiteflash+58j
  63. seg000:E90F                 mov     bp, di          ; draw sprite whose dest is aligned
  64. seg000:E90F                                         ; on a left boundary
  65. seg000:E90F                                         ; This includes shifted sprites
  66. seg000:E911                 jmp     cs:off_E896[bx]
  67. seg000:E916 ; ---------------------------------------------------------------------------
  68. seg000:E916
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