forked from KolibriOS/kolibrios
135 lines
1.9 KiB
NASM
135 lines
1.9 KiB
NASM
macro .comment
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{
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init_envmap: ; create 512x512 env map
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.temp equ word [ebp-2]
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push ebp
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mov ebp,esp
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sub esp,2
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mov edi,envmap
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fninit
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mov dx,-256
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.ie_ver:
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mov cx,-256
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.ie_hor:
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mov .temp,cx
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fild .temp
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fmul st,st0
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mov .temp,dx
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fild .temp
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fmul st,st0
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faddp
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fsqrt
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mov .temp,254
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fisubr .temp
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fmul [env_const]
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fistp .temp
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mov ax,.temp
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or ax,ax
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jge .ie_ok1
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xor ax,ax
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jmp .ie_ok2
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.ie_ok1:
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cmp ax,254
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jle .ie_ok2
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mov ax,254
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.ie_ok2:
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push dx
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mov bx,ax
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mul [max_color_b]
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shr ax,8
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stosb
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mov ax,bx
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mul [max_color_g]
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shr ax,8
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stosb
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mov ax,bx
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mul [max_color_r]
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shr ax,8
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stosb
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pop dx
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inc cx
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cmp cx,256
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jne .ie_hor
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inc dx
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cmp dx,256
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jne .ie_ver
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mov esp,ebp
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pop ebp
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ret
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}
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calc_bumpmap: ; calculate random bumpmap
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;--------------in edi _ pointer to TEX_X x TEX_Y bumpmap
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push edi
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mov ecx,TEXTURE_SIZE
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@@:
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push ecx
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xor ecx,ecx
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mov edx,255
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call random
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stosb
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pop ecx
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loop @b
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pop edi
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mov ecx,4
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.blur:
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xor esi,esi
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mov edx,TEXTURE_SIZE
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xor eax,eax
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xor ebx,ebx
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@@:
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mov ebp,esi
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dec ebp
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and ebp,TEXTURE_SIZE
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mov al,byte[ebp+edi]
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mov ebp,esi
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inc ebp
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and ebp,TEXTURE_SIZE
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mov bl,byte[ebp+edi]
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add eax,ebx
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mov ebp,esi
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sub ebp,TEX_X
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and ebp,TEXTURE_SIZE
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mov bl,byte[ebp+edi]
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add eax,ebx
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mov ebp,esi
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add ebp,TEX_X
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and ebp,TEXTURE_SIZE
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mov bl,byte[ebp+edi]
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add eax,ebx
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shr eax,2
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mov byte[esi+edi],al
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inc esi
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dec edx
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jnz @b
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loop .blur
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ret
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random:
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; in - ecx - min
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; edx - max
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; out - eax - random number
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mov bx,[rand_seed]
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add bx,0x9248
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ror bx,3
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mov [rand_seed],bx
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mov ax,dx
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sub ax,cx
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mul bx
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mov ax,dx
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add ax,cx
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cwde
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ret
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rand_seed dw ?
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