481 lines
9.7 KiB
NASM
481 lines
9.7 KiB
NASM
gouraud_triangle:
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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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;---------------------- 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
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.col1b equ ebp+8
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.col2r equ ebp+10
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.col2g equ ebp+12
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.col2b equ ebp+14
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.col3r equ ebp+16
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.col3g equ ebp+18
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.col3b equ ebp+20
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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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.dc12r equ dword[ebp-16]
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.dc12g equ dword[ebp-20]
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.dc12b equ dword[ebp-24]
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.dc13r equ dword[ebp-28]
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.dc13g equ dword[ebp-32]
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.dc13b equ dword[ebp-36]
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.dc23r equ dword[ebp-40]
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.dc23g equ dword[ebp-44]
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.dc23b equ dword[ebp-48]
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.c1r equ dword[ebp-52]
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.c1g equ dword[ebp-56]
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.c1b equ dword[ebp-60]
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.c2r equ dword[ebp-64]
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.c2g equ dword[ebp-68]
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.c2b equ dword[ebp-72]
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.dx12 equ dword[ebp-76]
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.dx13 equ dword[ebp-80]
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.dx23 equ dword[ebp-84]
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mov ebp,esp
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; sub esp,72
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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 dx,word[.col1b]
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xchg dx,word[.col2b]
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mov word[.col1b],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[.col2r]
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xchg edx,dword[.col3r]
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mov dword[.col2r],edx
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mov dx,word[.col2b]
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xchg dx,word[.col3b]
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mov word[.col2b],dx
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jmp .sort3
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.sort2:
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push eax ;store triangle coordinates in user friendly variables
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push ebx
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push ecx
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sub esp,72 ; set correctly value of esp
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mov edx,eax ; check only X triangle coordinate
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or edx,ebx
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or edx,ecx
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test edx,80000000h
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jne .gt_loop2_end
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shr eax,16
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cmp ax,SIZE_X-1
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jg .gt_loop2_end
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shr ebx,16
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cmp bx,SIZE_X-1
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jg .gt_loop2_end
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shr ecx,16
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cmp cx,SIZE_X-1
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jg .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 .dc12r,0
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mov .dc12g,0
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mov .dc12b,0
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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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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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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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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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.gt_dx12_done:
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mov bx,.y3
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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 .dc13r,0
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mov .dc13g,0
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mov .dc13b,0
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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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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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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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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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.gt_dx13_done:
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mov bx,.y3
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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 .dc23r,0
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mov .dc23g,0
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mov .dc23b,0
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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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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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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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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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.gt_dx23_done:
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movsx eax,.x1
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shl eax,ROUND
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mov ebx,eax
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movsx 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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movsx 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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movsx 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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push eax ; eax - cur x1
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push ebx ; ebx - cur x2
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push cx ; cx - cur y
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push edi
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push ebp
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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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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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push cx
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sar ebx,ROUND
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push bx
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sar eax,ROUND
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push ax
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call gouraud_line
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pop ebp
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pop edi
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pop cx
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pop ebx
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pop eax
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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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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
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shl ebx,ROUND
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movsx edx,word[.col2r]
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shl edx,ROUND
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mov .c2r,edx
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movsx edx,word[.col2g]
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shl edx,ROUND
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mov .c2g,edx
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movsx 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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push eax ; eax - cur x1
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push ebx ; ebx - cur x2
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push cx
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push edi
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push ebp
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mov edx,.c2r
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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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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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push cx
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sar ebx,ROUND
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push bx
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sar eax,ROUND
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push ax
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call gouraud_line
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pop ebp
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pop edi
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pop cx
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pop ebx
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pop eax
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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,.dc23r
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add .c2r,edx
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mov edx,.dc23g
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add .c2g,edx
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mov edx,.dc23b
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add .c2b,edx
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add eax,.dx13
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add ebx,.dx23
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inc cx
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cmp cx,.y3
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jl .gt_loop2
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.gt_loop2_end:
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; add esp,84
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mov esp,ebp
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ret 18
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gouraud_line:
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;-------------in - edi - pointer to screen buffer
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;----------------- stack - another parameters
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.x1 equ word [ebp+4]
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.x2 equ word [ebp+6]
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.y equ word [ebp+8]
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.col1b equ ebp+10
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.col1g equ ebp+12
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.col1r equ ebp+14
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.col2b equ ebp+16
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.col2g equ ebp+18
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.col2r equ ebp+20
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.dc_r equ dword[ebp-4]
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.dc_g equ dword[ebp-8]
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.dc_b equ dword[ebp-12]
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mov ebp,esp
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mov ax,.y
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or ax,ax
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jl .gl_quit
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cmp ax,SIZE_Y-1
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jg .gl_quit
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mov ax,.x1
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cmp ax,.x2
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je .gl_quit
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jl .gl_ok
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xchg ax,.x2
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mov .x1,ax
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mov eax,dword[.col1b]
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xchg eax,dword[.col2b]
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mov dword[.col1b],eax
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mov ax,word[.col1r]
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xchg ax,word[.col2r]
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mov word[.col1r],ax
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.gl_ok:
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; cmp .x1,SIZE_X-1 ;check
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; jg .gl_quit
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; cmp .x2,SIZE_X-1
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; jl @f
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; mov .x2,SIZE_X-1
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; @@:
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; cmp .x1,0
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; jg @f
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; mov .x1,0
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; @@:
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; cmp .x2,0
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; jl .gl_quit
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movsx ecx,.y
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mov eax,SIZE_X*3
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mul ecx
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movsx ebx,.x1
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lea ecx,[ebx*2+eax]
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add edi,ecx
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add edi,ebx
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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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mov cx,.x2
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sub cx,.x1
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movsx ecx,cx
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idiv ecx
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;mov .dc_r,eax ;first delta
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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 ecx
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;mov .dc_g,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 ecx
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; mov .dc_b,eax
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push eax
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movsx ebx,word[.col1r]
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shl ebx,ROUND
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movsx edx,word[.col1g]
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shl edx,ROUND
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movsx esi,word[.col1b]
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shl esi,ROUND
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.gl_draw:
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mov eax,ebx
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sar eax,ROUND
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stosb
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mov eax,edx
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sar eax,ROUND
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stosb
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mov eax,esi
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sar eax,ROUND
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stosb
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add ebx,.dc_r
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add edx,.dc_g
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add esi,.dc_b
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loop .gl_draw
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.gl_quit:
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; add esp,12
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mov esp,ebp
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ret 18 |