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added via accelerant, a copy of skeleton driver yet.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13585 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Rudolf Cornelissen
2005-07-10 17:45:55 +00:00
parent b69daae506
commit 35bf20db0f
1 changed files with 161 additions and 0 deletions
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src/add-ons/accelerants/via/GetModeInfo.c
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/*
Copyright 1999, Be Incorporated. All Rights Reserved.
This file may be used under the terms of the Be Sample Code License.
Other authors:
Mark Watson
Rudolf Cornelissen 9/2002-5/2003
*/
#define MODULE_BIT 0x02000000
#include "acc_std.h"
/*
Return the current display mode. The only time you might return an
error is if a mode hasn't been set. Or if the system hands you a NULL pointer.
*/
status_t GET_DISPLAY_MODE(display_mode *current_mode)
{
/* check for NULL pointer */
if (current_mode == NULL) return B_ERROR;
*current_mode = si->dm;
return B_OK;
}
/* Return the frame buffer configuration information. */
status_t GET_FRAME_BUFFER_CONFIG(frame_buffer_config *afb)
{
/* check for NULL pointer */
if (afb == NULL) return B_ERROR;
*afb = si->fbc;
return B_OK;
}
/* Return the maximum and minium pixelclock limits for the specified mode. */
/* NOTE:
* Due to BeOS constraints output for all heads will be limited to the head with
* the least capabilities. */
status_t GET_PIXEL_CLOCK_LIMITS(display_mode *dm, uint32 *low, uint32 *high)
{
uint32 max_pclk = 0;
uint32 min_pclk = 0;
/* check for NULL pointers */
if ((dm == NULL) || (low == NULL) || (high == NULL)) return B_ERROR;
/* specify requested info */
if (dm->flags & DUALHEAD_BITS)
{
/* dualhead mode */
/* find min. value */
switch (si->ps.card_type)
{
default:
*low = ((si->ps.min_video_vco * 1000) / 16);
break;
}
/* find max. value:
* using decondary DAC specs because they could be narrower (twinview) */
switch (dm->space)
{
case B_CMAP8:
max_pclk = si->ps.max_dac2_clock_8;
break;
case B_RGB15_LITTLE:
case B_RGB16_LITTLE:
max_pclk = si->ps.max_dac2_clock_16;
break;
case B_RGB24_LITTLE:
max_pclk = si->ps.max_dac2_clock_24;
break;
case B_RGB32_LITTLE:
/* specially noted because of RAM speed constraints! */
max_pclk = si->ps.max_dac2_clock_32dh;
break;
default:
/* use fail-safe value */
max_pclk = si->ps.max_dac2_clock_32dh;
break;
}
/* return values in kHz */
*high = max_pclk * 1000;
}
else
{
/* singlehead mode */
/* find min. value */
switch (si->ps.card_type)
{
default:
*low = ((si->ps.min_pixel_vco * 1000) / 16);
break;
}
/* find max. value: depends on which head is used as primary head */
if (!si->ps.crtc2_prim)
{
switch (dm->space)
{
case B_CMAP8:
max_pclk = si->ps.max_dac1_clock_8;
break;
case B_RGB15_LITTLE:
case B_RGB16_LITTLE:
max_pclk = si->ps.max_dac1_clock_16;
break;
case B_RGB24_LITTLE:
max_pclk = si->ps.max_dac1_clock_24;
break;
case B_RGB32_LITTLE:
max_pclk = si->ps.max_dac1_clock_32;
break;
default:
/* use fail-safe value */
max_pclk = si->ps.max_dac1_clock_32;
break;
}
}
else
{
switch (dm->space)
{
case B_CMAP8:
max_pclk = si->ps.max_dac2_clock_8;
break;
case B_RGB15_LITTLE:
case B_RGB16_LITTLE:
max_pclk = si->ps.max_dac2_clock_16;
break;
case B_RGB24_LITTLE:
max_pclk = si->ps.max_dac2_clock_24;
break;
case B_RGB32_LITTLE:
max_pclk = si->ps.max_dac2_clock_32;
break;
default:
/* use fail-safe value */
max_pclk = si->ps.max_dac2_clock_32;
break;
}
}
/* return values in kHz */
*high = max_pclk * 1000;
}
/* clamp lower limit to 48Hz vertical refresh for now.
* Apparantly the BeOS screenprefs app does limit the upper refreshrate to 90Hz,
* while it does not limit the lower refreshrate. */
min_pclk = ((uint32)dm->timing.h_total * (uint32)dm->timing.v_total * 48) / 1000;
if (min_pclk > *low) *low = min_pclk;
return B_OK;
}
/* Return the semaphore id that will be used to signal a vertical sync occured. */
sem_id ACCELERANT_RETRACE_SEMAPHORE(void)
{
// return si->vblank;
return B_ERROR;
}