/**

  * $Id: pvr2.c,v 1.25 2006-05-24 11:48:58 nkeynes Exp $

  *

  * PVR2 (Video) Core module implementation and MMIO registers.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #define MODULE pvr2_module

 #include "dream.h"

 #include "display.h"

 #include "mem.h"

 #include "asic.h"

 #include "pvr2/pvr2.h"

 #include "sh4/sh4core.h"

 #define MMIO_IMPL

 #include "pvr2/pvr2mmio.h"

 char *video_base;

 static void pvr2_init( void );

 static void pvr2_reset( void );

 static uint32_t pvr2_run_slice( uint32_t );

 static void pvr2_save_state( FILE *f );

 static int pvr2_load_state( FILE *f );

 void pvr2_display_frame( void );

 struct dreamcast_module pvr2_module = { "PVR2", pvr2_init, pvr2_reset, NULL, 

 					pvr2_run_slice, NULL,

 					pvr2_save_state, pvr2_load_state };

 display_driver_t display_driver = NULL;

 struct video_timing {

     int fields_per_second;

     int total_lines;

     int retrace_lines;

     int line_time_ns;

 };

 struct video_timing pal_timing = { 50, 625, 65, 32000 };

 struct video_timing ntsc_timing= { 60, 525, 65, 31746 };

 struct pvr2_state {

     uint32_t frame_count;

     uint32_t line_count;

     uint32_t line_remainder;

     uint32_t irq_vpos1;

     uint32_t irq_vpos2;

     gboolean retrace;

     struct video_timing timing;

 } pvr2_state;

 struct video_buffer video_buffer[2];

 int video_buffer_idx = 0;

 static void pvr2_init( void )

 {

     register_io_region( &mmio_region_PVR2 );

     register_io_region( &mmio_region_PVR2PAL );

     register_io_region( &mmio_region_PVR2TA );

     video_base = mem_get_region_by_name( MEM_REGION_VIDEO );

     texcache_init();

     pvr2_reset();

 }

 static void pvr2_reset( void )

 {

     pvr2_state.line_count = 0;

     pvr2_state.line_remainder = 0;

     pvr2_state.irq_vpos1 = 0;

     pvr2_state.irq_vpos2 = 0;

     pvr2_state.retrace = FALSE;

     pvr2_state.timing = ntsc_timing;

     video_buffer_idx = 0;

     pvr2_ta_init();

     pvr2_render_init();

     texcache_flush();

 }

 static void pvr2_save_state( FILE *f )

 {

     fwrite( &pvr2_state, sizeof(pvr2_state), 1, f );

 }

 static int pvr2_load_state( FILE *f )

 {

     if( fread( &pvr2_state, sizeof(pvr2_state), 1, f ) != 1 )

 	return 1;

     return 0;

 }

 static uint32_t pvr2_run_slice( uint32_t nanosecs ) 

 {

     pvr2_state.line_remainder += nanosecs;

     while( pvr2_state.line_remainder >= pvr2_state.timing.line_time_ns ) {

 	pvr2_state.line_remainder -= pvr2_state.timing.line_time_ns;

 	pvr2_state.line_count++;

 	if( pvr2_state.line_count == pvr2_state.timing.total_lines ) {

 	    asic_event( EVENT_RETRACE );

 	    pvr2_state.line_count = 0;

 	    pvr2_state.retrace = TRUE;

 	}

 	if( pvr2_state.line_count == pvr2_state.irq_vpos1 ) {

 	    asic_event( EVENT_SCANLINE1 );

 	} 

 	if( pvr2_state.line_count == pvr2_state.irq_vpos2 ) {

 	    asic_event( EVENT_SCANLINE2 );

 	}

 	if( pvr2_state.line_count == pvr2_state.timing.retrace_lines ) {

 	    if( pvr2_state.retrace ) {

 		pvr2_display_frame();

 		pvr2_state.retrace = FALSE;

 	    }

 	}

     }

     return nanosecs;

 }

 int pvr2_get_frame_count() 

 {

     return pvr2_state.frame_count;

 }

 /**

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

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

  * new frame size/depth.

  */

 void pvr2_display_frame( void )

 {

     uint32_t display_addr = MMIO_READ( PVR2, DISPADDR1 );

     int dispsize = MMIO_READ( PVR2, DISPSIZE );

     int dispmode = MMIO_READ( PVR2, DISPMODE );

     int vidcfg = MMIO_READ( PVR2, DISPCFG );

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

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

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

     gboolean bEnabled = (dispmode & DISPMODE_DE) && (vidcfg & DISPCFG_VO ) ? TRUE : FALSE;

     gboolean interlaced = (vidcfg & DISPCFG_I ? TRUE : FALSE);

     if( bEnabled ) {

 	video_buffer_t buffer = &video_buffer[video_buffer_idx];

 	video_buffer_idx = !video_buffer_idx;

 	video_buffer_t last = &video_buffer[video_buffer_idx];

 	buffer->rowstride = (vid_ppl + vid_stride) << 2;

 	buffer->data = video_base + MMIO_READ( PVR2, DISPADDR1 );

 	buffer->vres = vid_lpf;

 	if( interlaced ) buffer->vres <<= 1;

 	switch( (dispmode & DISPMODE_COL) >> 2 ) {

 	case 0: 

 	    buffer->colour_format = COLFMT_ARGB1555;

 	    buffer->hres = vid_ppl << 1; 

 	    break;

 	case 1: 

 	    buffer->colour_format = COLFMT_RGB565;

 	    buffer->hres = vid_ppl << 1; 

 	    break;

 	case 2:

 	    buffer->colour_format = COLFMT_RGB888;

 	    buffer->hres = (vid_ppl << 2) / 3; 

 	    break;

 	case 3: 

 	    buffer->colour_format = COLFMT_ARGB8888;

 	    buffer->hres = vid_ppl; 

 	    break;

 	}

 	if( display_driver != NULL ) {

 	    if( buffer->hres != last->hres ||

 		buffer->vres != last->vres ||

 		buffer->colour_format != last->colour_format) {

 		display_driver->set_display_format( buffer->hres, buffer->vres,

 						  buffer->colour_format );

 	    }

 	    if( MMIO_READ( PVR2, DISPCFG2 ) & 0x08 ) { /* Blanked */

 		uint32_t colour = MMIO_READ( PVR2, DISPBORDER );

 		display_driver->display_blank_frame( colour );

 	    } else if( !pvr2_render_display_frame( PVR2_RAM_BASE + display_addr ) ) {

 		display_driver->display_frame( buffer );

 	    }

 	}

     } else {

 	video_buffer_idx = 0;

 	video_buffer[0].hres = video_buffer[0].vres = 0;

     }

     pvr2_state.frame_count++;

 }

 void mmio_region_PVR2_write( uint32_t reg, uint32_t val )

 {

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

         MMIO_WRITE( PVR2, reg, val );

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

         return;

     }

     if( reg == PVRID ) {

 	ERROR( "Write attempted to readonly register PVRID: ", val );

 	return;

     }

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

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

     MMIO_WRITE( PVR2, reg, val );

     switch(reg) {

     case DISPADDR1:

 	if( pvr2_state.retrace ) {

 	    pvr2_display_frame();

 	    pvr2_state.retrace = FALSE;

 	}

 	break;

     case VPOS_IRQ:

 	pvr2_state.irq_vpos1 = (val >> 16) & 0x03FF;

 	pvr2_state.irq_vpos2 = val & 0x03FF;

 	break;

     case TAINIT:

 	if( val & 0x80000000 )

 	    pvr2_ta_init();

 	break;

     case RENDSTART:

 	if( val == 0xFFFFFFFF )

 	    pvr2_render_scene();

 	break;

     }

 }

 MMIO_REGION_READ_FN( PVR2, reg )

 {

     switch( reg ) {

         case BEAMPOS:

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

         default:

             return MMIO_READ( PVR2, reg );

     }

 }

 MMIO_REGION_DEFFNS( PVR2PAL )

 void pvr2_set_base_address( uint32_t base ) 

 {

     mmio_region_PVR2_write( DISPADDR1, base );

 }

 int32_t mmio_region_PVR2TA_read( uint32_t reg )

 {

     return 0xFFFFFFFF;

 }

 void mmio_region_PVR2TA_write( uint32_t reg, uint32_t val )

 {

     pvr2_ta_write( &val, sizeof(uint32_t) );

 }

 void pvr2_vram64_write( sh4addr_t destaddr, char *src, uint32_t length )

 {

     int bank_flag = (destaddr & 0x04) >> 2;

     uint32_t *banks[2];

     uint32_t *dwsrc;

     int i;

     destaddr = destaddr & 0x7FFFFF;

     if( destaddr + length > 0x800000 ) {

 	length = 0x800000 - destaddr;

     }

     for( i=destaddr & 0xFFFFF000; i < destaddr + length; i+= PAGE_SIZE ) {

 	texcache_invalidate_page( i );

     }

     banks[0] = ((uint32_t *)(video_base + ((destaddr & 0x007FFFF8) >>1)));

     banks[1] = banks[0] + 0x100000;

     if( bank_flag ) 

 	banks[0]++;

     /* Handle non-aligned start of source */

     if( destaddr & 0x03 ) {

 	char *dest = ((char *)banks[bank_flag]) + (destaddr & 0x03);

 	for( i= destaddr & 0x03; i < 4 && length > 0; i++, length-- ) {

 	    *dest++ = *src++;

 	}

 	bank_flag = !bank_flag;

     }

     dwsrc = (uint32_t *)src;

     while( length >= 4 ) {

 	*banks[bank_flag]++ = *dwsrc++;

 	bank_flag = !bank_flag;

 	length -= 4;

     }

     /* Handle non-aligned end of source */

     if( length ) {

 	src = (char *)dwsrc;

 	char *dest = (char *)banks[bank_flag];

 	while( length-- > 0 ) {

 	    *dest++ = *src++;

 	}

     }  

 }

 void pvr2_vram64_read( char *dest, sh4addr_t srcaddr, uint32_t length )

 {

     int bank_flag = (srcaddr & 0x04) >> 2;

     uint32_t *banks[2];

     uint32_t *dwdest;

     int i;

     srcaddr = srcaddr & 0x7FFFFF;

     if( srcaddr + length > 0x800000 )

 	length = 0x800000 - srcaddr;

     banks[0] = ((uint32_t *)(video_base + ((srcaddr&0x007FFFF8)>>1)));

     banks[1] = banks[0] + 0x100000;

     if( bank_flag )

 	banks[0]++;

     /* Handle non-aligned start of source */

     if( srcaddr & 0x03 ) {

 	char *src = ((char *)banks[bank_flag]) + (srcaddr & 0x03);

 	for( i= srcaddr & 0x03; i < 4 && length > 0; i++, length-- ) {

 	    *dest++ = *src++;

 	}

 	bank_flag = !bank_flag;

     }

     dwdest = (uint32_t *)dest;

     while( length >= 4 ) {

 	*dwdest++ = *banks[bank_flag]++;

 	bank_flag = !bank_flag;

 	length -= 4;

     }

     /* Handle non-aligned end of source */

     if( length ) {

 	dest = (char *)dwdest;

 	char *src = (char *)banks[bank_flag];

 	while( length-- > 0 ) {

 	    *dest++ = *src++;

 	}

     }

 }

 void pvr2_vram64_dump( sh4addr_t addr, uint32_t length, FILE *f ) 

 {

     char tmp[length];

     pvr2_vram64_read( tmp, addr, length );

     fwrite_dump( tmp, length, f );

 }