src/add-ons/accelerants/skeleton/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         Mark Watson
   7         Rudolf Cornelissen 9/2002-5/2003
   8 */
   9
  10 #define MODULE_BIT 0x02000000
  11
  12 #include "acc_std.h"
  13
  14 /*
  15         Return the current display mode.  The only time you might return an
  16         error is if a mode hasn't been set. Or if the system hands you a NULL pointer.
  17 */
  18 status_t GET_DISPLAY_MODE(display_mode *current_mode)
  19 {
  20         /* check for NULL pointer */
  21         if (current_mode == NULL) return B_ERROR;
  22
  23         *current_mode = si->dm;
  24         return B_OK;
  25 }
  26
  27 /* Return the frame buffer configuration information. */
  28 status_t GET_FRAME_BUFFER_CONFIG(frame_buffer_config *afb)
  29 {
  30         /* check for NULL pointer */
  31         if (afb == NULL) return B_ERROR;
  32
  33         *afb = si->fbc;
  34         return B_OK;
  35 }
  36
  37 /* Return the maximum and minium pixelclock limits for the specified mode. */
  38 /* NOTE:
  39  * Due to BeOS constraints output for all heads will be limited to the head with
  40  * the least capabilities. */
  41 status_t GET_PIXEL_CLOCK_LIMITS(display_mode *dm, uint32 *low, uint32 *high)
  42 {
  43         uint32 max_pclk = 0;
  44         uint32 min_pclk = 0;
  45
  46         /* check for NULL pointers */
  47         if ((dm == NULL) || (low == NULL) || (high == NULL)) return B_ERROR;
  48
  49         /* specify requested info */
  50         if (dm->flags & DUALHEAD_BITS)
  51         {
  52                 /* dualhead mode */
  53                 /* find min. value */
  54                 switch (si->ps.card_type)
  55                 {
  56                         default:
  57                                 *low = ((si->ps.min_video_vco * 1000) / 16);
  58                                 break;
  59                 }
  60                 /* find max. value:
  61                  * using decondary DAC specs because they could be narrower (twinview) */
  62                 switch (dm->space)
  63                 {
  64                         case B_CMAP8:
  65                                 max_pclk = si->ps.max_dac2_clock_8;
  66                                 break;
  67                         case B_RGB15_LITTLE:
  68                         case B_RGB16_LITTLE:
  69                                 max_pclk = si->ps.max_dac2_clock_16;
  70                                 break;
  71                         case B_RGB24_LITTLE:
  72                                 max_pclk = si->ps.max_dac2_clock_24;
  73                                 break;
  74                         case B_RGB32_LITTLE:
  75                                 /* specially noted because of RAM speed constraints! */
  76                                 max_pclk = si->ps.max_dac2_clock_32dh;
  77                                 break;
  78                         default:
  79                                 /* use fail-safe value */
  80                                 max_pclk = si->ps.max_dac2_clock_32dh;
  81                                 break;
  82                 }
  83                 /* return values in kHz */
  84                 *high = max_pclk * 1000;
  85         }
  86         else
  87         {
  88                 /* singlehead mode */
  89                 /* find min. value */
  90                 switch (si->ps.card_type)
  91                 {
  92                         default:
  93                                 *low = ((si->ps.min_pixel_vco * 1000) / 16);
  94                                 break;
  95                 }
  96                 /* find max. value: depends on which head is used as primary head */
  97                 if (!si->ps.crtc2_prim)
  98                 {
  99                         switch (dm->space)
 100                         {
 101                                 case B_CMAP8:
 102                                         max_pclk = si->ps.max_dac1_clock_8;
 103                                         break;
 104                                 case B_RGB15_LITTLE:
 105                                 case B_RGB16_LITTLE:
 106                                         max_pclk = si->ps.max_dac1_clock_16;
 107                                         break;
 108                                 case B_RGB24_LITTLE:
 109                                         max_pclk = si->ps.max_dac1_clock_24;
 110                                         break;
 111                                 case B_RGB32_LITTLE:
 112                                         max_pclk = si->ps.max_dac1_clock_32;
 113                                         break;
 114                                 default:
 115                                         /* use fail-safe value */
 116                                         max_pclk = si->ps.max_dac1_clock_32;
 117                                         break;
 118                         }
 119                 }
 120                 else
 121                 {
 122                         switch (dm->space)
 123                         {
 124                                 case B_CMAP8:
 125                                         max_pclk = si->ps.max_dac2_clock_8;
 126                                         break;
 127                                 case B_RGB15_LITTLE:
 128                                 case B_RGB16_LITTLE:
 129                                         max_pclk = si->ps.max_dac2_clock_16;
 130                                         break;
 131                                 case B_RGB24_LITTLE:
 132                                         max_pclk = si->ps.max_dac2_clock_24;
 133                                         break;
 134                                 case B_RGB32_LITTLE:
 135                                         max_pclk = si->ps.max_dac2_clock_32;
 136                                         break;
 137                                 default:
 138                                         /* use fail-safe value */
 139                                         max_pclk = si->ps.max_dac2_clock_32;
 140                                         break;
 141                         }
 142                 }
 143                 /* return values in kHz */
 144                 *high = max_pclk * 1000;
 145         }
 146
 147         /* clamp lower limit to 48Hz vertical refresh for now.
 148          * Apparantly the BeOS screenprefs app does limit the upper refreshrate to 90Hz,
 149          * while it does not limit the lower refreshrate. */
 150         min_pclk = ((uint32)dm->timing.h_total * (uint32)dm->timing.v_total * 48) / 1000;
 151         if (min_pclk > *low) *low = min_pclk;
 152
 153         return B_OK;
 154 }
 155
 156 /* Return the semaphore id that will be used to signal a vertical sync occured.  */
 157 sem_id ACCELERANT_RETRACE_SEMAPHORE(void)
 158 {
 159 //      return si->vblank;
 160 return B_ERROR;
 161 }