75 lines
902 B
NASM
75 lines
902 B
NASM
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;; x, y, r, g, b
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putpixel:
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push ebp
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mov ebp, esp
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push eax
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push ebx
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push ecx
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push edi
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; Destination
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std
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mov edi, [mbootinfo.fb_addr]
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mov eax, [mbootinfo.fb_pitch]
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mul dword [ebp+12] ;y
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add edi, eax
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mov eax, [ebp+8] ;x
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mul byte [mbootinfo.fb_bytespp]
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dec eax
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add edi, eax
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movzx eax, [mbootinfo.fb_bytespp]
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dec eax
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add edi, eax
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; Blue
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mov ebx, [ebp + 24]
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mov cl, [mbootinfo.fb_bpos]
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shl ebx, cl
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or eax, ebx
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; Green
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mov ebx, [ebp + 20]
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mov cl, [mbootinfo.fb_gpos]
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shl ebx, cl
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or eax, ebx
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; Red
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mov ebx, [ebp + 16]
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mov cl, [mbootinfo.fb_rpos]
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shl ebx, cl
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or eax, ebx
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cmp [mbootinfo.fb_bpp], 24
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je .24bpp
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jne .32bpp
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.done:
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pop edi
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pop ecx
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pop ebx
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pop eax
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pop ebp
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ret
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.32bpp:
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stosb
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shr eax, 8
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stosb
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shr eax, 8
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stosb
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shr eax, 8
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stosb
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jmp .done
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.24bpp:
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;shr eax, 8
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stosb
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shr eax, 8
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stosb
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shr eax, 8
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stosb
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jmp .done
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.msg db 10, ":D", 10, 0
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