598 lines
12 KiB
NASM
598 lines
12 KiB
NASM
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ROUND equ 8
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CATMULL_SHIFT equ 8
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gouraud_triangle_z:
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;----procedure drawing gouraud triangle with z coordinate
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;----interpolation ( Catmull alghoritm )-----------------
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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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;---------------------- esi - pointer to Z-buffer--------
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;---------------------- Z-buffer filled with dd variables
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;---------------------- shifted CATMULL_SHIFT------------
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;---------------------- edi - pointer to screen buffer---
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;---------------------- stack : colors-------------------
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;----------------- procedure don't save registers !!-----
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.col1r equ ebp+4 ; each color as word
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.col1g equ ebp+6 ; each z coordinate as word
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.col1b equ ebp+8
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.z1 equ ebp+10
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.col2r equ ebp+12
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.col2g equ ebp+14
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.col2b equ ebp+16
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.z2 equ ebp+18
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.col3r equ ebp+20
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.col3g equ ebp+22
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.col3b equ ebp+24
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.z3 equ ebp+26
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.x1 equ word[ebp-2]
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.y1 equ word[ebp-4]
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.x2 equ word[ebp-6]
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.y2 equ word[ebp-8]
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.x3 equ word[ebp-10]
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.y3 equ word[ebp-12]
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.dx12 equ dword[ebp-16]
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.dz12 equ dword[ebp-20]
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.dc12r equ dword[ebp-24]
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.dc12g equ dword[ebp-28]
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.dc12b equ dword[ebp-32]
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.dx13 equ dword[ebp-36]
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.dz13 equ dword[ebp-40]
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.dc13r equ dword[ebp-44]
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.dc13g equ dword[ebp-48]
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.dc13b equ dword[ebp-52]
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.dx23 equ dword[ebp-56]
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.dz23 equ dword[ebp-60]
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.dc23r equ dword[ebp-64]
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.dc23g equ dword[ebp-68]
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.dc23b equ dword[ebp-72]
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.c1r equ dword[ebp-76]
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.c1g equ dword[ebp-80]
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.c1b equ dword[ebp-84]
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.c2r equ dword[ebp-88]
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.c2g equ dword[ebp-92]
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.c2b equ dword[ebp-96]
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.zz1 equ dword[ebp-100]
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.zz2 equ dword[ebp-104]
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mov ebp,esp
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; sub esp,84
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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[.col1r]
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xchg edx,dword[.col2r]
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mov dword[.col1r],edx
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mov edx,dword[.col1b]
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xchg edx,dword[.col2b]
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mov dword[.col1b],edx
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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[.col2r]
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xchg edx,dword[.col3r]
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mov dword[.col2r],edx
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mov edx,dword[.col2b]
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xchg edx,dword[.col3b]
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mov dword[.col2b],edx
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jmp .sort3
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.sort2:
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push eax ; store 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 .gt_loop2_end
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mov bx,.y2 ; calc deltas
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sub bx,.y1
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jnz .gt_dx12_make
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; mov .dx12,0
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; mov .dz12,0
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; mov .dc12r,0
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; mov .dc12g,0
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; mov .dc12b,0
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mov ecx,5
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@@:
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push dword 0
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loop @b
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jmp .gt_dx12_done
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.gt_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[.z2]
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sub ax,word[.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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mov ax,word[.col2r]
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sub ax,word[.col1r]
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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 .dc12r,eax
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push eax
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mov ax,word[.col2g]
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sub ax,word[.col1g]
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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 .dc12g,eax
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push eax
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mov ax,word[.col2b]
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sub ax,word[.col1b]
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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 .dc12b,eax
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push eax
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.gt_dx12_done:
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mov bx,.y3 ; calc deltas
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sub bx,.y1
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jnz .gt_dx13_make
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; mov .dx13,0
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; mov .dz13,0
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; mov .dc13r,0
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; mov .dc13g,0
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; mov .dc13b,0
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mov ecx,5
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@@:
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push dword 0
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loop @b
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jmp .gt_dx13_done
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.gt_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[.z3]
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sub ax,word[.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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mov ax,word[.col3r]
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sub ax,word[.col1r]
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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 .dc13r,eax
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push eax
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mov ax,word[.col3g]
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sub ax,word[.col1g]
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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 .dc13g,eax
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push eax
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mov ax,word[.col3b]
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sub ax,word[.col1b]
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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 .dc13b,eax
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push eax
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.gt_dx13_done:
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mov bx,.y3 ; calc deltas
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sub bx,.y2
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jnz .gt_dx23_make
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; mov .dx23,0
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; mov .dz23,0
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; mov .dc23r,0
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; mov .dc23g,0
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; mov .dc23b,0
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mov ecx,5
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@@:
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push dword 0
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loop @b
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jmp .gt_dx23_done
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.gt_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[.z3]
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sub ax,word[.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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push eax
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mov ax,word[.col3r]
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sub ax,word[.col2r]
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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 .dc23r,eax
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push eax
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mov ax,word[.col3g]
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sub ax,word[.col2g]
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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 .dc23g,eax
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push eax
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mov ax,word[.col3b]
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sub ax,word[.col2b]
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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 .dc23b,eax
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push eax
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.gt_dx23_done:
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sub esp,32
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movsx eax,.x1 ; eax - cur x1
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shl eax,ROUND ; ebx - cur x2
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mov ebx,eax
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movsx edx,word[.z1]
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shl edx,CATMULL_SHIFT
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mov .zz1,edx
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mov .zz2,edx
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movzx edx,word[.col1r]
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shl edx,ROUND
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mov .c1r,edx
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mov .c2r,edx
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movzx edx,word[.col1g]
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shl edx,ROUND
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mov .c1g,edx
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mov .c2g,edx
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movzx edx,word[.col1b]
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shl edx,ROUND
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mov .c1b,edx
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mov .c2b,edx
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mov cx,.y1
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cmp cx,.y2
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jge .gt_loop1_end
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.gt_loop1:
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pushad
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; macro .debug
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mov edx,.c2r ; c2r,c2g,c2b,c1r,c1g,c1b - current colors
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sar edx,ROUND
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push dx
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mov edx,.c2g
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sar edx,ROUND
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push dx
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mov edx,.c2b
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sar edx,ROUND
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push dx
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sar ebx,ROUND ; x2
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push bx
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mov edx,.c1r
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sar edx,ROUND
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push dx
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mov edx,.c1g
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sar edx,ROUND
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push dx
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mov edx,.c1b
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sar edx,ROUND
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push dx
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sar eax,ROUND
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push ax ; x1
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push cx ; y
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push .zz2
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push .zz1
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call gouraud_line_z
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popad
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mov edx,.dc13r
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add .c1r,edx
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mov edx,.dc13g
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add .c1g,edx
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mov edx,.dc13b
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add .c1b,edx
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mov edx,.dc12r
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add .c2r,edx
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mov edx,.dc12g
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add .c2g,edx
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mov edx,.dc12b
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add .c2b,edx
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mov edx,.dz13
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add .zz1,edx
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mov edx,.dz12
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add .zz2,edx
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add eax,.dx13
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add ebx,.dx12
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inc cx
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cmp cx,.y2
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jl .gt_loop1
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.gt_loop1_end:
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mov cx,.y2
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cmp cx,.y3
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jge .gt_loop2_end
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movsx ebx,.x2 ; eax - cur x1
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shl ebx,ROUND ; ebx - cur x2
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movsx edx,word[.z2]
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shl edx,CATMULL_SHIFT
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mov .zz2,edx
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movzx edx,word[.col2r]
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shl edx,ROUND
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mov .c2r,edx
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movzx edx,word[.col2g]
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shl edx,ROUND
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mov .c2g,edx
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movzx edx,word[.col2b]
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shl edx,ROUND
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mov .c2b,edx
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.gt_loop2:
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pushad
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; macro .debug
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mov edx,.c2r ; c2r,c2g,c2b,c1r,c1g,c1b - current colors
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sar edx,ROUND
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push dx
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mov edx,.c2g
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sar edx,ROUND
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push dx
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mov edx,.c2b
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sar edx,ROUND
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push dx
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sar ebx,ROUND ; x2
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push bx
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mov edx,.c1r
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sar edx,ROUND
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push dx
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mov edx,.c1g
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sar edx,ROUND
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push dx
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mov edx,.c1b
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sar edx,ROUND
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||
|
|
push dx
|
||
|
|
sar eax,ROUND
|
||
|
|
push ax ; x1
|
||
|
|
push cx ; y
|
||
|
|
push .zz2
|
||
|
|
push .zz1
|
||
|
|
call gouraud_line_z
|
||
|
|
|
||
|
|
popad
|
||
|
|
|
||
|
|
mov edx,.dc13r
|
||
|
|
add .c1r,edx
|
||
|
|
mov edx,.dc13g
|
||
|
|
add .c1g,edx
|
||
|
|
mov edx,.dc13b
|
||
|
|
add .c1b,edx
|
||
|
|
mov edx,.dc23r
|
||
|
|
add .c2r,edx
|
||
|
|
mov edx,.dc23g
|
||
|
|
add .c2g,edx
|
||
|
|
mov edx,.dc23b
|
||
|
|
add .c2b,edx
|
||
|
|
mov edx,.dz13
|
||
|
|
add .zz1,edx
|
||
|
|
mov edx,.dz23
|
||
|
|
add .zz2,edx
|
||
|
|
|
||
|
|
add eax,.dx13
|
||
|
|
add ebx,.dx23
|
||
|
|
inc cx
|
||
|
|
cmp cx,.y3
|
||
|
|
jl .gt_loop2
|
||
|
|
.gt_loop2_end:
|
||
|
|
|
||
|
|
mov esp,ebp
|
||
|
|
ret 24
|
||
|
|
gouraud_line_z:
|
||
|
|
;----------------- procedure drawing gouraud line
|
||
|
|
;----------------- with z coordinate interpolation
|
||
|
|
;----------------- esi - pointer to Z_buffer
|
||
|
|
;----------------- edi - pointer to screen buffer
|
||
|
|
;----------------- stack:
|
||
|
|
.z1 equ dword[ebp+4] ; z coordiunate shifted left CATMULL_SHIFT
|
||
|
|
.z2 equ dword[ebp+8]
|
||
|
|
.y equ word[ebp+12]
|
||
|
|
.x1 equ ebp+14
|
||
|
|
.c1b equ ebp+16
|
||
|
|
.c1g equ ebp+18
|
||
|
|
.c1r equ ebp+20
|
||
|
|
.x2 equ ebp+22
|
||
|
|
.c2b equ ebp+24
|
||
|
|
.c2g equ ebp+26
|
||
|
|
.c2r equ ebp+28
|
||
|
|
.dz equ dword[ebp-4]
|
||
|
|
.dc_r equ dword[ebp-8]
|
||
|
|
.dc_g equ dword[ebp-12]
|
||
|
|
.dc_b equ dword[ebp-14]
|
||
|
|
.cr equ dword[ebp-18]
|
||
|
|
.cg equ dword[ebp-22]
|
||
|
|
.cb equ dword[ebp-26]
|
||
|
|
mov ebp,esp
|
||
|
|
|
||
|
|
mov ax,.y
|
||
|
|
or ax,ax
|
||
|
|
jl .gl_quit
|
||
|
|
cmp ax,SIZE_Y
|
||
|
|
jge .gl_quit
|
||
|
|
|
||
|
|
mov eax,dword[.x1]
|
||
|
|
cmp ax,word[.x2]
|
||
|
|
je .gl_quit
|
||
|
|
jl @f
|
||
|
|
|
||
|
|
xchg eax,dword[.x2]
|
||
|
|
mov dword[.x1],eax
|
||
|
|
mov eax,dword[.c1g]
|
||
|
|
xchg eax,dword[.c2g]
|
||
|
|
mov dword[.c1g],eax
|
||
|
|
mov eax,.z1
|
||
|
|
xchg eax,.z2
|
||
|
|
mov .z1,eax
|
||
|
|
@@:
|
||
|
|
cmp word[.x1],SIZE_X
|
||
|
|
jge .gl_quit
|
||
|
|
cmp word[.x2],0
|
||
|
|
jle .gl_quit
|
||
|
|
|
||
|
|
mov eax,.z2
|
||
|
|
sub eax,.z1
|
||
|
|
cdq
|
||
|
|
mov bx,word[.x2] ; dz = z2-z1/x2-x1
|
||
|
|
sub bx,word[.x1]
|
||
|
|
movsx ebx,bx
|
||
|
|
idiv ebx
|
||
|
|
push eax
|
||
|
|
|
||
|
|
mov ax,word[.c2r]
|
||
|
|
sub ax,word[.c1r]
|
||
|
|
cwde
|
||
|
|
shl eax,ROUND ; dc_r = c2r-c1r/x2-x1
|
||
|
|
cdq
|
||
|
|
idiv ebx
|
||
|
|
push eax
|
||
|
|
|
||
|
|
mov ax,word[.c2g]
|
||
|
|
sub ax,word[.c1g]
|
||
|
|
cwde
|
||
|
|
shl eax,ROUND
|
||
|
|
cdq
|
||
|
|
idiv ebx
|
||
|
|
push eax
|
||
|
|
|
||
|
|
mov ax,word[.c2b]
|
||
|
|
sub ax,word[.c1b]
|
||
|
|
cwde
|
||
|
|
shl eax,ROUND
|
||
|
|
cdq
|
||
|
|
idiv ebx
|
||
|
|
push eax
|
||
|
|
|
||
|
|
cmp word[.x1],0
|
||
|
|
jg @f
|
||
|
|
mov eax,.dz
|
||
|
|
movsx ebx,word[.x1]
|
||
|
|
neg ebx
|
||
|
|
imul ebx
|
||
|
|
add .z1,eax
|
||
|
|
mov word[.x1],0
|
||
|
|
|
||
|
|
mov eax,.dc_r
|
||
|
|
imul ebx
|
||
|
|
sar eax,ROUND
|
||
|
|
add word[.c1r],ax
|
||
|
|
|
||
|
|
mov eax,.dc_g
|
||
|
|
imul ebx
|
||
|
|
sar eax,ROUND
|
||
|
|
add word[.c1g],ax
|
||
|
|
|
||
|
|
mov eax,.dc_b
|
||
|
|
imul ebx
|
||
|
|
sar eax,ROUND
|
||
|
|
add word[.c1b],ax
|
||
|
|
|
||
|
|
@@:
|
||
|
|
cmp word[.x2],SIZE_X
|
||
|
|
jl @f
|
||
|
|
mov word[.x2],SIZE_X
|
||
|
|
@@:
|
||
|
|
sub esp,12 ; calculate memory begin
|
||
|
|
mov edx,SIZE_X ; in buffers
|
||
|
|
movzx eax,.y
|
||
|
|
mul edx
|
||
|
|
movzx edx,word[.x1]
|
||
|
|
add eax,edx
|
||
|
|
push eax
|
||
|
|
lea eax,[eax*3]
|
||
|
|
add edi,eax
|
||
|
|
pop eax
|
||
|
|
shl eax,2
|
||
|
|
add esi,eax
|
||
|
|
|
||
|
|
mov cx,word[.x2]
|
||
|
|
sub cx,word[.x1]
|
||
|
|
movzx ecx,cx
|
||
|
|
mov ebx,.z1 ; ebx - currrent z shl CATMULL_SIFT
|
||
|
|
mov edx,.dz ; edx - delta z
|
||
|
|
movzx eax,word[.c1r]
|
||
|
|
shl eax,ROUND
|
||
|
|
mov .cr,eax
|
||
|
|
movzx eax,word[.c1g]
|
||
|
|
shl eax,ROUND
|
||
|
|
mov .cg,eax
|
||
|
|
movzx eax,word[.c1b]
|
||
|
|
shl eax,ROUND
|
||
|
|
mov .cb,eax
|
||
|
|
.ddraw:
|
||
|
|
cmp ebx,dword[esi]
|
||
|
|
jge .skip
|
||
|
|
mov eax,.cr
|
||
|
|
sar eax,ROUND
|
||
|
|
stosb
|
||
|
|
mov eax,.cg
|
||
|
|
sar eax,ROUND
|
||
|
|
stosb
|
||
|
|
mov eax,.cb
|
||
|
|
sar eax,ROUND
|
||
|
|
stosb
|
||
|
|
mov dword[esi],ebx
|
||
|
|
jmp .no_skip
|
||
|
|
.skip:
|
||
|
|
add edi,3
|
||
|
|
.no_skip:
|
||
|
|
add esi,4
|
||
|
|
add ebx,edx
|
||
|
|
mov eax,.dc_r
|
||
|
|
add .cr,eax
|
||
|
|
mov eax,.dc_g
|
||
|
|
add .cg,eax
|
||
|
|
mov eax,.dc_b
|
||
|
|
add .cb,eax
|
||
|
|
loop .ddraw
|
||
|
|
|
||
|
|
.gl_quit:
|
||
|
|
mov esp,ebp
|
||
|
|
ret 26
|