src/add-ons/accelerants/neomagic/GetModeInfo.c

   1 /*
   2         Copyright 1999, Be Incorporated.   All Rights Reserved.
   3         This file may be used under the terms of the Be Sample Code License.
   4
   5         Other authors:
   6         Rudolf Cornelissen 4/2003-1/2006
   7 */
   8
   9 #define MODULE_BIT 0x02000000
  10
  11 #include "acc_std.h"
  12
  13 /*
  14         Return the current display mode.  The only time you might return an
  15         error is if a mode hasn't been set. Or if the system hands you a NULL pointer.
  16 */
  17 status_t GET_DISPLAY_MODE(display_mode *current_mode)
  18 {
  19         /* check for NULL pointer */
  20         if (current_mode == NULL) return B_ERROR;
  21
  22         *current_mode = si->dm;
  23         return B_OK;
  24 }
  25
  26 /* Return the frame buffer configuration information. */
  27 status_t GET_FRAME_BUFFER_CONFIG(frame_buffer_config *afb)
  28 {
  29         /* check for NULL pointer */
  30         if (afb == NULL) return B_ERROR;
  31
  32         *afb = si->fbc;
  33         return B_OK;
  34 }
  35
  36 /* Return the maximum and minium pixelclock limits for the specified mode. */
  37 status_t GET_PIXEL_CLOCK_LIMITS(display_mode *dm, uint32 *low, uint32 *high)
  38 {
  39         uint32 max_pclk = 0;
  40         uint32 min_pclk = 0;
  41
  42         /* check for NULL pointers */
  43         if ((dm == NULL) || (low == NULL) || (high == NULL)) return B_ERROR;
  44
  45         /* specify requested info assuming CRT-only mode
  46          * (if panel is active, CRTC and pixelclock are not programmed!) */
  47         {
  48                 /* find min. value */
  49                 switch (si->ps.card_type)
  50                 {
  51                         default:
  52                                 *low = (si->ps.min_pixel_vco * 1000);
  53                                 break;
  54                 }
  55                 /* find max. value */
  56                 switch (dm->space)
  57                 {
  58                         case B_CMAP8:
  59                                 max_pclk = si->ps.max_dac1_clock_8;
  60                                 break;
  61                         case B_RGB15_LITTLE:
  62                         case B_RGB16_LITTLE:
  63                                 max_pclk = si->ps.max_dac1_clock_16;
  64                                 break;
  65                         case B_RGB24_LITTLE:
  66                                 max_pclk = si->ps.max_dac1_clock_24;
  67                                 break;
  68                         default:
  69                                 /* use fail-safe value */
  70                                 max_pclk = si->ps.max_dac1_clock_24;
  71                                 break;
  72                 }
  73                 /* return values in kHz */
  74                 *high = max_pclk * 1000;
  75         }
  76
  77         /* clamp lower limit to 48Hz vertical refresh for now.
  78          * Apparantly the BeOS screenprefs app does limit the upper refreshrate to 90Hz,
  79          * while it does not limit the lower refreshrate. */
  80         min_pclk = ((uint32)dm->timing.h_total * (uint32)dm->timing.v_total * 48) / 1000;
  81         if (min_pclk > *low) *low = min_pclk;
  82
  83         return B_OK;
  84 }
  85
  86 /* Return the semaphore id that will be used to signal a vertical sync occured.  */
  87 sem_id ACCELERANT_RETRACE_SEMAPHORE(void)
  88 {
  89         if (si->ps.int_assigned)
  90 //              return si->vblank;
  91 //temp:
  92                 return B_ERROR;
  93         else
  94                 return B_ERROR;
  95 }