Posted: Sat Mar 02, 2013 10:16 am
Actually the bitmap engine use 4 packed pixel as the MD does.peekpoke wrote:Cant give u definitely answer right nowTmEE co.(TM) wrote:So you cannot push the pixels closer together on Stef's code ?As i understand, Stef's bitmaps routines are fast, because they treat pixels as bytes instead of nibble (8 bit, instead of 4 bit) - so because of this bitmap is "vertically interlaced" on screen. But to be true i didnt looked into his routines very closely... I may be completely wrong! But even if i right, probably, here is some way to switch it to 4bit mode... If Stef read this, and its not difficult for him, he may comment on this issue.
So you can easily double pixel by writing c | (c<<4) to the buffer.
I modified the drawSlice method this way :
Code: Select all
inline void drawSlice( u8 screenX, SLICE *slice )
{
if( slice->sliceHeight == 0 ) return;
u8 offsetY = ( slice->sliceHeight > 64 ) ? ( 0 ) : ( 32 - ( slice->sliceHeight >> 1 ) );
u8 overflowY = ( slice->sliceHeight <= 64 ) ? ( 0 ) : ( ( slice->sliceHeight - 64 ) >> 1 );
register u8 heightY = ( slice->sliceHeight > 64 ) ? ( 64 ) : ( slice->sliceHeight );
register u16 textureInc = divlut[slice->sliceHeight];
register u16 textureY = ( overflowY * textureInc );
register u16 *texturePtr = &textures[ slice->textureId ][ slice->textureOffset ];
register u8 *screenBuffer = &bmp_buffer_write[screenX + ((offsetY + 16) * BMP_PITCH)];
while( heightY )
{
register u16 c = texturePtr[ textureY & ~63 ];
*screenBuffer = c | (c << 4);
screenBuffer += BMP_PITCH;
textureY += textureInc;
heightY--;
}
}