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meaning of some bits figured out 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4761 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2002-02-19 20:54:58 +00:00
parent 3300606233
commit 35a54e6204
1 changed files with 12 additions and 1 deletions
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13
vidix/drivers/mach64_vid.c
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@ -519,11 +519,22 @@ static void mach64_vid_display_video( void )
OUTREG(SCALER_BUF1_OFFSET_U, besr.vid_buf4_base_adrs);
OUTREG(SCALER_BUF1_OFFSET_V, besr.vid_buf5_base_adrs);
OUTREG(OVERLAY_SCALE_CNTL, 0xC4000003);
// OVERLAY_SCALE_CNTL bits & what they seem to affect
// bit 0 no effect
// bit 1 yuv2rgb coeff related
// bit 2 horizontal interpolation if 0
// bit 3 vertical interpolation if 0
// bit 4 chroma related
// bit 5-6 gamma correction
// bit 7 nothing visible if set
// bit 8-27 no effect
// bit 28-31 nothing interresting just crashed my system when i played with them :(
mach64_wait_for_idle();
vf = INREG(VIDEO_FORMAT);
// Bits 16-19 seem to select the format
// Bit 28 seems to toggle the chroma encoding
// Bit 28 seems to toggle something affects luma & chroma
// the remaining bits seem to have no effect
switch(besr.fourcc)