/**

 * $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 );

}