forked from KolibriOS/kolibrios
769 lines
15 KiB
NASM
769 lines
15 KiB
NASM
;SIZE_X equ 350
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;SIZE_Y equ 350
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ROUND equ 8
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;TEX_X equ 512
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;TEX_Y equ 512
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;TEXTURE_SIZE EQU (512*512)-1
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;TEX_SHIFT EQU 9
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CATMULL_SHIFT equ 8
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;TEXTURE_SIZE EQU (TEX_X * TEX_Y)-1
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;------- Big thanks to Majuma (www.majuma.xt.pl) for absolutely great---
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;------- DOS 13h mode demos --------------------------------------------
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;------- Procedure draws bump triangle using Catmull Z-buffer algorithm-
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;------- (Z coordinate interpolation)-----------------------------------
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bump_triangle_z:
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;------------------in - eax - x1 shl 16 + y1 -----------
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;---------------------- ebx - x2 shl 16 + y2 -----------
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;---------------------- ecx - x3 shl 16 + y3 -----------
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;---------------------- edx - pointer to bump map ------
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;---------------------- esi - pointer to environment map
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;---------------------- edi - pointer to screen buffer--
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;---------------------- stack : bump coordinates--------
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;---------------------- environment coordinates-
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;---------------------- Z position coordinates--
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;---------------------- pointer io Z buffer-----
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;-- Z-buffer - filled with coordinates as dword --------
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;-- (Z coor. as word) shl CATMULL_SHIFT ----------------
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.b_x1 equ ebp+4 ; procedure don't save registers !!!
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.b_y1 equ ebp+6 ; each coordinate as word
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.b_x2 equ ebp+8
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.b_y2 equ ebp+10
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.b_x3 equ ebp+12
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.b_y3 equ ebp+14
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.e_x1 equ ebp+16
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.e_y1 equ ebp+18
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.e_x2 equ ebp+20
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.e_y2 equ ebp+22
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.e_x3 equ ebp+24
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.e_y3 equ ebp+26
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.z1 equ word[ebp+28]
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.z2 equ word[ebp+30]
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.z3 equ word[ebp+32]
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.z_buff equ dword[ebp+34] ; pointer to Z-buffer
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.t_bmap equ dword[ebp-4] ; pointer to bump map
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.t_emap equ dword[ebp-8] ; pointer to e. map
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.x1 equ word[ebp-10]
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.y1 equ word[ebp-12]
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.x2 equ word[ebp-14]
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.y2 equ word[ebp-16]
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.x3 equ word[ebp-18]
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.y3 equ word[ebp-20]
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.dx12 equ dword[ebp-24]
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.dbx12 equ dword[ebp-28]
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.dby12 equ dword[ebp-32]
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.dex12 equ dword[ebp-36]
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.dey12 equ dword[ebp-40]
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.dz12 equ dword[ebp-44]
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.dx13 equ dword[ebp-48]
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.dbx13 equ dword[ebp-52]
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.dby13 equ dword[ebp-56]
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.dex13 equ dword[ebp-60]
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.dey13 equ dword[ebp-64]
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.dz13 equ dword[ebp-68]
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.dx23 equ dword[ebp-72]
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.dbx23 equ dword[ebp-76]
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.dby23 equ dword[ebp-80]
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.dex23 equ dword[ebp-84]
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.dey23 equ dword[ebp-88]
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.dz23 equ dword[ebp-92]
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.cx1 equ dword[ebp-96] ; current variables
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.cx2 equ dword[ebp-100]
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.cbx1 equ dword[ebp-104]
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.cbx2 equ dword[ebp-108]
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.cby1 equ dword[ebp-112]
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.cby2 equ dword[ebp-116]
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.cex1 equ dword[ebp-120]
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.cex2 equ dword[ebp-124]
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.cey1 equ dword[ebp-128]
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.cey2 equ dword[ebp-132]
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.cz1 equ dword[ebp-136]
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.cz2 equ dword[ebp-140]
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mov ebp,esp
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push edx ; store bump map
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push esi ; store e. map
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; sub esp,120
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.sort3: ; sort triangle coordinates...
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cmp ax,bx
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jle .sort1
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xchg eax,ebx
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mov edx,dword[.b_x1]
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xchg edx,dword[.b_x2]
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mov dword[.b_x1],edx
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mov edx,dword[.e_x1]
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xchg edx,dword[.e_x2]
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mov dword[.e_x1],edx
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mov dx,.z1
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xchg dx,.z2
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mov .z1,dx
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.sort1:
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cmp bx,cx
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jle .sort2
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xchg ebx,ecx
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mov edx,dword[.b_x2]
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xchg edx,dword[.b_x3]
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mov dword[.b_x2],edx
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mov edx,dword[.e_x2]
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xchg edx,dword[.e_x3]
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mov dword[.e_x2],edx
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mov dx,.z2
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xchg dx,.z3
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mov .z2,dx
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jmp .sort3
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.sort2:
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push eax ; store triangle coords in variables
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push ebx
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push ecx
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mov edx,80008000h ; eax,ebx,ecx are ANDd together into edx which means that
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and edx,ebx ; if *all* of them are negative a sign flag is raised
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and edx,ecx
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and edx,eax
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test edx,80008000h ; Check both X&Y at once
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jne .loop23_done
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; mov edx,eax ; eax,ebx,ecx are ORd together into edx which means that
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; or edx,ebx ; if any *one* of them is negative a sign flag is raised
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; or edx,ecx
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; test edx,80000000h ; Check only X
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; jne .loop23_done
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; cmp .x1,SIZE_X ; {
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; jg .loop23_done
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; cmp .x2,SIZE_X ; This can be optimized with effort
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; jg .loop23_done
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; cmp .x3,SIZE_X
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; jg .loop23_done ; {
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mov bx,.y2 ; calc delta 12
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sub bx,.y1
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jnz .bt_dx12_make
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mov ecx,6
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xor edx,edx
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@@:
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push edx ;dword 0
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loop @b
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jmp .bt_dx12_done
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.bt_dx12_make:
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mov ax,.x2
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sub ax,.x1
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cwde
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movsx ebx,bx
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dx12,eax
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push eax
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mov ax,word[.b_x2]
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sub ax,word[.b_x1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dbx12,eax
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push eax
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mov ax,word[.b_y2]
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sub ax,word[.b_y1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dby12,eax
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push eax
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mov ax,word[.e_x2]
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sub ax,word[.e_x1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dex12,eax
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push eax
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mov ax,word[.e_y2]
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sub ax,word[.e_y1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dey12,eax
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push eax
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mov ax,.z2
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sub ax,.z1
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cwde
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shl eax,CATMULL_SHIFT
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cdq
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idiv ebx
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push eax
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.bt_dx12_done:
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mov bx,.y3 ; calc delta13
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sub bx,.y1
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jnz .bt_dx13_make
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mov ecx,6
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xor edx,edx
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@@:
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push edx ;dword 0
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loop @b
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jmp .bt_dx13_done
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.bt_dx13_make:
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mov ax,.x3
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sub ax,.x1
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cwde
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movsx ebx,bx
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dx13,eax
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push eax
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mov ax,word[.b_x3]
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sub ax,word[.b_x1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dbx13,eax
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push eax
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mov ax,word[.b_y3]
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sub ax,word[.b_y1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dby13,eax
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push eax
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mov ax,word[.e_x3]
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sub ax,word[.e_x1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dex13,eax
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push eax
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mov ax,word[.e_y3]
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sub ax,word[.e_y1]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dey13,eax
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push eax
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; nop here bug ????!!!
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mov ax,.z3
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sub ax,.z1
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cwde
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shl eax,CATMULL_SHIFT
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cdq
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idiv ebx
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; mov .dz13,eax
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push eax
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.bt_dx13_done:
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mov bx,.y3 ; calc delta23
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sub bx,.y2
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jnz .bt_dx23_make
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mov ecx,6
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xor edx,edx
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@@:
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push edx ;dword 0
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loop @b
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jmp .bt_dx23_done
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.bt_dx23_make:
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mov ax,.x3
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sub ax,.x2
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cwde
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movsx ebx,bx
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dx23,eax
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push eax
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mov ax,word[.b_x3]
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sub ax,word[.b_x2]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dbx23,eax
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push eax
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mov ax,word[.b_y3]
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sub ax,word[.b_y2]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dby23,eax
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push eax
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mov ax,word[.e_x3]
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sub ax,word[.e_x2]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dex23,eax
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push eax
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mov ax,word[.e_y3]
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sub ax,word[.e_y2]
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cwde
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shl eax,ROUND
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cdq
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idiv ebx
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; mov .dey23,eax
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push eax
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mov ax,.z3
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sub ax,.z2
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cwde
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shl eax,CATMULL_SHIFT
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cdq
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idiv ebx
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; mov .dz23,eax
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push eax
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; sub esp,40
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.bt_dx23_done:
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movsx eax,.x1
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shl eax,ROUND
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; mov .cx1,eax
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; mov .cx2,eax
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push eax
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push eax
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movsx eax,word[.b_x1]
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shl eax,ROUND
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; mov .cbx1,eax
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; mov .cbx2,eax
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push eax
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push eax
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movsx eax,word[.b_y1]
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shl eax,ROUND
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; mov .cby1,eax
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; mov .cby2,eax
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push eax
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push eax
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movsx eax,word[.e_x1]
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shl eax,ROUND
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;mov .cex1,eax
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;mov .cex2,eax
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push eax
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push eax
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movsx eax,word[.e_y1]
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shl eax,ROUND
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;mov .cey1,eax
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;mov .cey2,eax
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push eax
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push eax
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movsx eax,.z1
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shl eax,CATMULL_SHIFT
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;mov .cz1,eax
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;mov .cz2,eax
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push eax
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push eax
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movsx ecx,.y1
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cmp cx,.y2
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jge .loop12_done
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.loop12:
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call .call_bump_line
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mov eax,.dx13
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add .cx1,eax
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mov eax,.dx12
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add .cx2,eax
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mov eax,.dbx13
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add .cbx1,eax
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mov eax,.dbx12
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add .cbx2,eax
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mov eax,.dby13
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add .cby1,eax
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mov eax,.dby12
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add .cby2,eax
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mov eax,.dex13
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add .cex1,eax
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mov eax,.dex12
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add .cex2,eax
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mov eax,.dey13
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add .cey1,eax
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mov eax,.dey12
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add .cey2,eax
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mov eax,.dz13
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add .cz1,eax
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mov eax,.dz12
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add .cz2,eax
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inc ecx
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cmp cx,.y2
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jl .loop12
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.loop12_done:
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movsx ecx,.y2
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cmp cx,.y3
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jge .loop23_done
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movsx eax,.z2
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shl eax,CATMULL_SHIFT
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mov .cz2,eax
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movsx eax,.x2
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shl eax,ROUND
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mov .cx2,eax
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movzx eax,word[.b_x2]
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shl eax,ROUND
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mov .cbx2,eax
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movzx eax,word[.b_y2]
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shl eax,ROUND
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mov .cby2,eax
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movzx eax,word[.e_x2]
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shl eax,ROUND
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mov .cex2,eax
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movzx eax,word[.e_y2]
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shl eax,ROUND
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mov .cey2,eax
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.loop23:
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call .call_bump_line
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mov eax,.dx13
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add .cx1,eax
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mov eax,.dx23
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add .cx2,eax
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mov eax,.dbx13
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add .cbx1,eax
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mov eax,.dbx23
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add .cbx2,eax
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mov eax,.dby13
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add .cby1,eax
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mov eax,.dby23
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add .cby2,eax
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mov eax,.dex13
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add .cex1,eax
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mov eax,.dex23
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add .cex2,eax
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mov eax,.dey13
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add .cey1,eax
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mov eax,.dey23
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add .cey2,eax
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mov eax,.dz13
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add .cz1,eax
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mov eax,.dz23
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add .cz2,eax
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inc ecx
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cmp cx,.y3
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jl .loop23
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.loop23_done:
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mov esp,ebp
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ret 34
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.call_bump_line:
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; push ebp
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; push ecx
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pushad
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push .cz1
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push .cz2
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push .z_buff
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push .t_emap
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push .t_bmap
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push .cey2
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push .cex2
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push .cey1
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push .cex1
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push .cby2
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push .cbx2
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push .cby1
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push .cbx1
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push ecx
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mov eax,.cx1
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sar eax,ROUND
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mov ebx,.cx2
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sar ebx,ROUND
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call bump_line_z
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popad
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ret
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bump_line_z:
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;--------------in: eax - x1
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;-------------- ebx - x2
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;-------------- edi - pointer to screen buffer
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;stack - another parameters :
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.y equ dword [ebp+4]
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.bx1 equ dword [ebp+8] ; ---
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.by1 equ dword [ebp+12] ; |
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.bx2 equ dword [ebp+16] ; |
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.by2 equ dword [ebp+20] ; |> bump and env coords
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.ex1 equ dword [ebp+24] ; |> shifted shl ROUND
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.ey1 equ dword [ebp+28] ; |
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.ex2 equ dword [ebp+32] ; |
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.ey2 equ dword [ebp+36] ; ---
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.bmap equ dword [ebp+40]
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.emap equ dword [ebp+44]
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.z_buff equ dword [ebp+48]
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.z2 equ dword [ebp+52] ; -- |> z coords shifted
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.z1 equ dword [ebp+56] ; -- shl CATMULL_SHIFT
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.x1 equ dword [ebp-4]
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.x2 equ dword [ebp-8]
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.dbx equ dword [ebp-12]
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.dby equ dword [ebp-16]
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.dex equ dword [ebp-20]
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.dey equ dword [ebp-24]
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.dz equ dword [ebp-28]
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.cbx equ dword [ebp-32]
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.cby equ dword [ebp-36]
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.cex equ dword [ebp-40]
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.cey equ dword [ebp-44]
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.cz equ dword [ebp-48]
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.czbuff equ dword [ebp-52]
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mov ebp,esp
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|
|
|
mov ecx,.y
|
|
or ecx,ecx
|
|
jl .bl_end
|
|
cmp ecx,SIZE_Y
|
|
jge .bl_end
|
|
|
|
cmp eax,ebx
|
|
jl .bl_ok
|
|
je .bl_end
|
|
|
|
xchg eax,ebx
|
|
|
|
mov edx,.bx1
|
|
xchg edx,.bx2
|
|
mov .bx1,edx
|
|
mov edx,.by1
|
|
xchg edx,.by2
|
|
mov .by1,edx
|
|
|
|
mov edx,.ex1
|
|
xchg edx,.ex2
|
|
mov .ex1,edx
|
|
mov edx,.ey1
|
|
xchg edx,.ey2
|
|
mov .ey1,edx
|
|
|
|
mov edx,.z1
|
|
xchg edx,.z2
|
|
mov .z1,edx
|
|
.bl_ok:
|
|
push eax
|
|
push ebx ;store x1, x2
|
|
|
|
cmp .x1,SIZE_X
|
|
jge .bl_end
|
|
cmp .x2,0
|
|
jle .bl_end
|
|
|
|
mov ebx,.x2
|
|
sub ebx,.x1
|
|
|
|
mov eax,.bx2 ; calc .dbx
|
|
sub eax,.bx1
|
|
cdq
|
|
idiv ebx
|
|
push eax
|
|
|
|
mov eax,.by2 ; calc .dby
|
|
sub eax,.by1
|
|
cdq
|
|
idiv ebx
|
|
push eax
|
|
|
|
mov eax,.ex2 ; calc .dex
|
|
sub eax,.ex1
|
|
cdq
|
|
idiv ebx
|
|
push eax
|
|
|
|
mov eax,.ey2 ; calc .dey
|
|
sub eax,.ey1
|
|
cdq
|
|
idiv ebx
|
|
push eax
|
|
|
|
mov eax,.z2 ; calc .dz
|
|
sub eax,.z1
|
|
cdq
|
|
idiv ebx
|
|
push eax
|
|
|
|
cmp .x1,0 ; set correctly begin variable
|
|
jge @f ; CLIPPING ON FUNCTION
|
|
; cutting triangle exceedes screen
|
|
mov ebx,.x1
|
|
neg ebx
|
|
imul ebx ; eax = .dz * abs(.x1)
|
|
add .z1,eax
|
|
mov .x1,0
|
|
|
|
mov eax,.dbx
|
|
imul ebx
|
|
add .bx1,eax
|
|
|
|
mov eax,.dby
|
|
imul ebx
|
|
add .by1,eax
|
|
|
|
mov eax,.dex
|
|
imul ebx
|
|
add .ex1,eax
|
|
|
|
mov eax,.dey
|
|
imul ebx
|
|
add .ey1,eax
|
|
@@:
|
|
cmp .x2,SIZE_X
|
|
jl @f
|
|
mov .x2,SIZE_X
|
|
@@:
|
|
mov eax,SIZE_X ;calc memory begin in buffers
|
|
mov ebx,.y
|
|
mul ebx
|
|
mov ebx,.x1
|
|
add eax,ebx
|
|
mov ebx,eax
|
|
lea eax,[eax*3]
|
|
add edi,eax
|
|
mov esi,.z_buff ; z-buffer filled with dd variables
|
|
shl ebx,2
|
|
add esi,ebx
|
|
|
|
mov ecx,.x2
|
|
sub ecx,.x1
|
|
; init current variables
|
|
push .bx1
|
|
push .by1
|
|
push .ex1
|
|
push .ey1
|
|
push .z1 ; current z shl CATMULL_SHIFT
|
|
push esi
|
|
.draw:
|
|
; if TEX = SHIFTING ;bump drawing only in shifting mode
|
|
mov esi,.czbuff ; .czbuff current address in buffer
|
|
mov ebx,.cz ; .cz - cur z position
|
|
cmp ebx,dword[esi]
|
|
jge .skip
|
|
|
|
mov eax,.cby
|
|
sar eax,ROUND
|
|
shl eax,TEX_SHIFT
|
|
mov esi,.cbx
|
|
sar esi,ROUND
|
|
add esi,eax
|
|
|
|
mov ebx,esi
|
|
dec ebx
|
|
and ebx,TEXTURE_SIZE
|
|
add ebx,.bmap
|
|
movzx eax,byte [ebx]
|
|
|
|
mov ebx,esi
|
|
inc ebx
|
|
and ebx,TEXTURE_SIZE
|
|
add ebx,.bmap
|
|
movzx ebx,byte [ebx]
|
|
sub eax,ebx
|
|
|
|
mov ebx,esi
|
|
sub ebx,TEX_X
|
|
and ebx,TEXTURE_SIZE
|
|
add ebx,.bmap
|
|
movzx edx,byte [ebx]
|
|
|
|
mov ebx,esi
|
|
add ebx,TEX_X
|
|
and ebx,TEXTURE_SIZE
|
|
add ebx,.bmap
|
|
movzx ebx,byte [ebx]
|
|
sub edx,ebx
|
|
|
|
mov ebx,.cex ;.cex - current env map X
|
|
sar ebx,ROUND
|
|
add eax,ebx ; eax - modified x coord
|
|
|
|
mov ebx,.cey ;.cey - current env map y
|
|
sar ebx,ROUND
|
|
add edx,ebx ; edx - modified y coord
|
|
|
|
or eax,eax
|
|
jl .black
|
|
cmp eax,TEX_X
|
|
jg .black
|
|
or edx,edx
|
|
jl .black
|
|
cmp edx,TEX_Y
|
|
jg .black
|
|
|
|
shl edx,TEX_SHIFT
|
|
add edx,eax
|
|
lea edx,[edx*3]
|
|
add edx,.emap
|
|
mov eax,dword[edx]
|
|
jmp .put_pixel
|
|
.black:
|
|
xor eax,eax
|
|
.put_pixel:
|
|
stosd
|
|
dec edi
|
|
mov ebx,.cz
|
|
mov esi,.czbuff
|
|
mov dword[esi],ebx
|
|
jmp .no_skip
|
|
.skip:
|
|
add edi,3
|
|
.no_skip:
|
|
add .czbuff,4
|
|
mov eax,.dbx
|
|
add .cbx,eax
|
|
mov eax,.dby
|
|
add .cby,eax
|
|
mov eax,.dex
|
|
add .cex,eax
|
|
mov eax,.dey
|
|
add .cey,eax
|
|
mov eax,.dz
|
|
add .cz,eax
|
|
|
|
dec ecx
|
|
jnz .draw
|
|
; end if
|
|
.bl_end:
|
|
mov esp,ebp
|
|
ret 56 |