24 lines
1.0 KiB
C
24 lines
1.0 KiB
C
/* ************************************************************************** */
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/* */
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/* ML_vertical_scroll.c */
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/* | Project : libmonochrome */
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/* */
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/* By: Pierre "PierrotLL" Le Gall <legallpierre89@gmail.com> */
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/* Last updated: 2011/11/22 */
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/* */
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/* ************************************************************************** */
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#include <monochrome/internals.h>
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void ML_vertical_scroll(int scroll)
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{
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int i, j;
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char column[64], *vram = ML_vram_address();
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scroll %= 64;
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for(i=0 ; i<16 ; i++)
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{
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for(j=0 ; j<64 ; j++) column[j] = vram[(j<<4)+i];
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for(j=0 ; j<64 ; j++) vram[(j<<4)+i] = column[(j-scroll+64)&63];
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}
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}
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