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setup move_overlay() functionality (part 2), not yet ready..

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10224 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Rudolf Cornelissen
2004-11-25 10:19:03 +00:00
parent bc1994c4fb
commit 12a8acf64d
1 changed files with 37 additions and 2 deletions
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src/add-ons/accelerants/matrox/engine/mga_bes.c
+37 -2
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@@ -317,12 +317,47 @@ static void gx00_bes_calc_move_overlay(move_overlay_info *moi)
moi->a1orgv &= 0x01fffff0; moi->a1orgv &= 0x01fffff0;
/* field 1 weight: AND below required by hardware, also make sure 'sign' is always 'positive' */ /* field 1 weight: AND below required by hardware, also make sure 'sign' is always 'positive' */
moi->v1srcstv &= 0x0000fffc;//fixme: was v1wghtv moi->v1srcstv &= 0x0000fffc;
} }
//fixme: impl:
static void gx00_bes_program_move_overlay(move_overlay_info moi) static void gx00_bes_program_move_overlay(move_overlay_info moi)
{ {
/*************************************
*** sync to BES (Back End Scaler) ***
*************************************/
/* Make sure reprogramming the BES completes before the next retrace occurs,
* to prevent register-update glitches (double buffer feature). */
LOG(3,("Overlay: starting register programming beyond Vcount %d\n", CR1R(VCOUNT)));
/* Even at 1600x1200x90Hz, a single line still takes about 9uS to complete:
* this resolution will generate about 180Mhz pixelclock while we can do
* upto 360Mhz. So snooze about 4uS to prevent bus-congestion...
* Appr. 200 lines time will provide enough room even on a 100Mhz CPU if it's
* screen is set to the highest refreshrate/resolution possible. */
while ((uint16)CR1R(VCOUNT) > (si->dm.timing.v_total - 200)) snooze(4);
/**************************************
*** actually program the registers ***
**************************************/
BESW(HCOORD, moi.hcoordv);
BESW(VCOORD, moi.vcoordv);
// BESW(HISCAL, hiscalv);
BESW(HSRCST, moi.hsrcstv);
BESW(HSRCEND, moi.hsrcendv);
// BESW(HSRCLST, hsrclstv);
// BESW(VISCAL, viscalv);
BESW(A1ORG, moi.a1orgv);
BESW(V1WGHT, moi.v1srcstv);
// BESW(V1SRCLST, v1srclstv);
// BESW(GLOBCTL, globctlv);
// BESW(CTL, ctlv);
/* on a 500Mhz P3 CPU just logging a line costs 400uS (18-19 vcounts at 1024x768x60Hz)!
* programming the registers above actually costs 180uS here */
LOG(3,("Overlay: completed at Vcount %d\n", CR1R(VCOUNT)));
} }
status_t gx00_configure_bes status_t gx00_configure_bes