lxdream.org :: lxdream/src/pvr2/pvr2.c r15:5194dd0fdb60

tree revision 15:5194dd0fdb60

filename	src/pvr2/pvr2.c
changeset	15:5194dd0fdb60
prev	2:42349f6ea216
next	16:f383e7640da4
author	nkeynes
date	Mon Dec 12 13:11:11 2005 +0000 (15 years ago)
permissions	-rw-r--r--
last change	Add dreamcast_module module structure

view

     1 #include "dream.h"

     2 #include "video.h"

     3 #include "mem.h"

     4 #include "asic.h"

     5 #include "modules.h"

     6 #include "pvr2.h"

     7 #define MMIO_IMPL

     8 #include "pvr2.h"

    10 char *video_base;

    12 void pvr2_init( void );

    14 struct dreamcast_module pvr2_module = { "PVR2", pvr2_init, NULL, NULL, NULL,

    15 					NULL, NULL };

    17 void pvr2_init( void )

    18 {

    19     mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );

    20     register_io_region( &mmio_region_PVR2 );

    21     video_base = mem_get_region_by_name( MEM_REGION_VIDEO );

    22 }

    24 uint32_t vid_stride, vid_lpf, vid_ppl, vid_hres, vid_vres, vid_col;

    25 int interlaced, bChanged = 1, bEnabled = 0, vid_size = 0;

    26 char *frame_start; /* current video start address (in real memory) */

    28 /*

    29  * Display the next frame, copying the current contents of video ram to

    30  * the window. If the video configuration has changed, first recompute the

    31  * new frame size/depth.

    32  */

    33 void pvr2_next_frame( void )

    34 {

    35     if( bChanged ) {

    36         int dispsize = MMIO_READ( PVR2, DISPSIZE );

    37         int dispmode = MMIO_READ( PVR2, DISPMODE );

    38         int vidcfg = MMIO_READ( PVR2, VIDCFG );

    39         vid_stride = ((dispsize & DISPSIZE_MODULO) >> 20) - 1;

    40         vid_lpf = ((dispsize & DISPSIZE_LPF) >> 10) + 1;

    41         vid_ppl = ((dispsize & DISPSIZE_PPL)) + 1;

    42         vid_col = (dispmode & DISPMODE_COL);

    43         frame_start = video_base + MMIO_READ( PVR2, DISPADDR1 );

    44         interlaced = (vidcfg & VIDCFG_I ? 1 : 0);

    45         bEnabled = (dispmode & DISPMODE_DE) && (vidcfg & VIDCFG_VO ) ? 1 : 0;

    46         vid_size = (vid_ppl * vid_lpf) << (interlaced ? 3 : 2);

    47         vid_hres = vid_ppl;

    48         vid_vres = vid_lpf;

    49         if( interlaced ) vid_vres <<= 1;

    50         switch( vid_col ) {

    51             case MODE_RGB15:

    52             case MODE_RGB16: vid_hres <<= 1; break;

    53             case MODE_RGB24: vid_hres *= 3; break;

    54             case MODE_RGB32: vid_hres <<= 2; break;

    55         }

    56         vid_hres >>= 2;

    57         video_update_size( vid_hres, vid_vres, vid_col );

    58         bChanged = 0;

    59     }

    60     if( bEnabled ) {

    61         /* Assume bit depths match for now... */

    62         memcpy( video_data, frame_start, vid_size );

    63     } else {

    64         memset( video_data, 0, vid_size );

    65     }

    66     video_update_frame();

    67     asic_event( EVENT_SCANLINE1 );

    68     asic_event( EVENT_SCANLINE2 );

    69     asic_event( EVENT_RETRACE );

    70 }

    72 void mmio_region_PVR2_write( uint32_t reg, uint32_t val )

    73 {

    74     if( reg >= 0x200 && reg < 0x600 ) { /* Fog table */

    75         MMIO_WRITE( PVR2, reg, val );

    76         /* I don't want to hear about these */

    77         return;

    78     }

    80     INFO( "PVR2 write to %08X <= %08X [%s: %s]", reg, val,

    81           MMIO_REGID(PVR2,reg), MMIO_REGDESC(PVR2,reg) );

    83     switch(reg) {

    84         case DISPSIZE: bChanged = 1;

    85         case DISPMODE: bChanged = 1;

    86         case DISPADDR1: bChanged = 1;

    87         case DISPADDR2: bChanged = 1;

    88         case VIDCFG: bChanged = 1;

    89             break;

    91     }

    92     MMIO_WRITE( PVR2, reg, val );

    93 }

    95 MMIO_REGION_READ_FN( PVR2, reg )

    96 {

    97     switch( reg ) {

    98         case BEAMPOS:

    99             return sh4r.icount&0x20 ? 0x2000 : 1;

   100         default:

   101             return MMIO_READ( PVR2, reg );

   102     }

   103 }