// license:LGPL-2.1+
// copyright-holders:Angelo Salese, Barry Rodewald
/****************************************************************************
*
* Sharp X1 Video functions
*
* TODO:
* - make this to be scanline renderer, fix palette partial updates;
* - take mc6845 device functions into account;
*
***************************************************************************/
#include "emu.h"
#include "includes/x1.h"
/*************************************
*
* Video Functions
*
*************************************/
void x1_state::video_start()
{
m_gfx_bitmap_ram = make_unique_clear<uint8_t[]>(0xc000*2);
m_bitmapbank->configure_entries(0, 2, m_gfx_bitmap_ram.get(), 0xc000);
m_bitmapbank->set_entry(0);
m_pal_4096 = make_unique_clear<uint8_t[]>(0x1000*3);
}
void x1_state::x1_draw_pixel(bitmap_rgb32 &bitmap,int y,int x,uint16_t pen,uint8_t width,uint8_t height)
{
if(!m_screen->visible_area().contains(x, y))
return;
if(width && height)
{
bitmap.pix32(y+0+m_ystart, x+0+m_xstart) = m_palette->pen(pen);
bitmap.pix32(y+0+m_ystart, x+1+m_xstart) = m_palette->pen(pen);
bitmap.pix32(y+1+m_ystart, x+0+m_xstart) = m_palette->pen(pen);
bitmap.pix32(y+1+m_ystart, x+1+m_xstart) = m_palette->pen(pen);
}
else if(width)
{
bitmap.pix32(y+m_ystart, x+0+m_xstart) = m_palette->pen(pen);
bitmap.pix32(y+m_ystart, x+1+m_xstart) = m_palette->pen(pen);
}
else if(height)
{
bitmap.pix32(y+0+m_ystart, x+m_xstart) = m_palette->pen(pen);
bitmap.pix32(y+1+m_ystart, x+m_xstart) = m_palette->pen(pen);
}
else
bitmap.pix32(y+m_ystart, x+m_xstart) = m_palette->pen(pen);
}
#define mc6845_h_char_total (m_crtc_vreg[0])
#define mc6845_h_display (m_crtc_vreg[1])
#define mc6845_h_sync_pos (m_crtc_vreg[2])
#define mc6845_sync_width (m_crtc_vreg[3])
#define mc6845_v_char_total (m_crtc_vreg[4])
#define mc6845_v_total_adj (m_crtc_vreg[5])
#define mc6845_v_display (m_crtc_vreg[6])
#define mc6845_v_sync_pos (m_crtc_vreg[7])
#define mc6845_mode_ctrl (m_crtc_vreg[8])
#define mc6845_tile_height (m_crtc_vreg[9]+1)
#define mc6845_cursor_y_start (m_crtc_vreg[0x0a])
#define mc6845_cursor_y_end (m_crtc_vreg[0x0b])
#define mc6845_start_addr (((m_crtc_vreg[0x0c]<<8) & 0x3f00) | (m_crtc_vreg[0x0d] & 0xff))
#define mc6845_cursor_addr (((m_crtc_vreg[0x0e]<<8) & 0x3f00) | (m_crtc_vreg[0x0f] & 0xff))
#define mc6845_light_pen_addr (((m_crtc_vreg[0x10]<<8) & 0x3f00) | (m_crtc_vreg[0x11] & 0xff))
#define mc6845_update_addr (((m_crtc_vreg[0x12]<<8) & 0x3f00) | (m_crtc_vreg[0x13] & 0xff))
/* adjust tile index when we are under double height condition */
uint8_t x1_state::check_prev_height(int x,int y,int x_size)
{
uint8_t prev_tile = m_tvram[(x+((y-1)*x_size)+mc6845_start_addr) & 0x7ff];
uint8_t cur_tile = m_tvram[(x+(y*x_size)+mc6845_start_addr) & 0x7ff];
uint8_t prev_attr = m_avram[(x+((y-1)*x_size)+mc6845_start_addr) & 0x7ff];
uint8_t cur_attr = m_avram[(x+(y*x_size)+mc6845_start_addr) & 0x7ff];
if(prev_tile == cur_tile && prev_attr == cur_attr)
return 8;
return 0;
}
/* Exoa II - Warroid: if double height isn't enabled on the first tile of the line then double height is disabled on everything else. */
uint8_t x1_state::check_line_valid_height(int y,int x_size,int height)
{
uint8_t line_attr = m_avram[(0+(y*x_size)+mc6845_start_addr) & 0x7ff];
if((line_attr & 0x40) == 0)
return 0;
return height;
}
void x1_state::draw_fgtilemap(bitmap_rgb32 &bitmap,const rectangle &cliprect)
{
/*
attribute table:
x--- ---- double width
-x-- ---- double height
--x- ---- PCG select
---x ---- color blinking
---- x--- reverse color
---- -xxx color pen
x--- ---- select Kanji ROM
-x-- ---- Kanji side (0=left, 1=right)
--x- ---- Underline
---x ---- Kanji ROM select (0=level 1, 1=level 2) (TODO: implement this)
---- xxxx Kanji upper 4 bits
*/
int y,x,res_x,res_y;
uint32_t tile_offset;
uint8_t x_size,y_size;
x_size = mc6845_h_display;
y_size = mc6845_v_display;
if(x_size == 0 || y_size == 0)
return; //don't bother if screen is off
if(x_size != 80 && x_size != 40 && y_size != 25)
popmessage("%d %d",x_size,y_size);
for (y=0;y<y_size;y++)
{
for (x=0;x<x_size;x++)
{
int tile = m_tvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff];
int color = m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff] & 0x1f;
int width = BIT(m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 7);
int height = BIT(m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 6);
int pcg_bank = BIT(m_avram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 5);
uint8_t *gfx_data = pcg_bank ? m_pcg_ram.get() : m_cg_rom; //machine.root_device().memregion(pcg_bank ? "pcg" : "cgrom")->base();
int knj_enable = 0;
int knj_side = 0;
int knj_bank = 0;
int knj_uline = 0;
if(m_is_turbo)
{
knj_enable = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 7);
knj_side = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 6);
knj_uline = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 5);
//knj_lv2 = BIT(m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff], 4);
knj_bank = m_kvram[((x+y*x_size)+mc6845_start_addr) & 0x7ff] & 0x0f;
if(knj_enable)
{
gfx_data = m_kanji_rom;
tile = ((tile + (knj_bank << 8)) << 1) + (knj_side & 1);
}
}
{
int pen[3],pen_mask,pcg_pen,xi,yi,dy;
pen_mask = color & 7;
dy = 0;
height = check_line_valid_height(y,x_size,height);
if(height && y)
dy = check_prev_height(x,y,x_size);
/* guess: assume that Kanji VRAM doesn't double the vertical size */
if(knj_enable) { height = 0; }
for(yi=0;yi<mc6845_tile_height;yi++)
{
for(xi=0;xi<8;xi++)
{
if(knj_enable) //kanji select
{
tile_offset = tile * 16;
tile_offset += (yi+dy*(m_scrn_reg.v400_mode+1)) >> (height+m_scrn_reg.v400_mode);
pen[0] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 1)>>0;
pen[1] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 2)>>1;
pen[2] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 4)>>2;
if(yi == mc6845_tile_height-1 && knj_uline) //underlined attribute
{
pen[0] = (pen_mask & 1)>>0;
pen[1] = (pen_mask & 2)>>1;
pen[2] = (pen_mask & 4)>>2;
}
if((yi >= 16 && m_scrn_reg.v400_mode == 0) || (yi >= 32 && m_scrn_reg.v400_mode == 1))
pen[0] = pen[1] = pen[2] = 0;
}
else if(pcg_bank) // PCG
{
tile_offset = tile * 8;
tile_offset += (yi+dy*(m_scrn_reg.v400_mode+1)) >> (height+m_scrn_reg.v400_mode);
pen[0] = gfx_data[tile_offset+0x0000]>>(7-xi) & (pen_mask & 1)>>0;
pen[1] = gfx_data[tile_offset+0x0800]>>(7-xi) & (pen_mask & 2)>>1;
pen[2] = gfx_data[tile_offset+0x1000]>>(7-xi) & (pen_mask & 4)>>2;
if((yi >= 8 && m_scrn_reg.v400_mode == 0) || (yi >= 16 && m_scrn_reg.v400_mode == 1))
pen[0] = pen[1] = pen[2] = 0;
}
else
{
tile_offset = tile * (8*(m_scrn_reg.ank_sel+1));
tile_offset += (yi+dy*(m_scrn_reg.v400_mode+1)) >> (height+m_scrn_reg.v400_mode);
pen[0] = gfx_data[tile_offset+m_scrn_reg.ank_sel*0x0800]>>(7-xi) & (pen_mask & 1)>>0;
pen[1] = gfx_data[tile_offset+m_scrn_reg.ank_sel*0x0800]>>(7-xi) & (pen_mask & 2)>>1;
pen[2] = gfx_data[tile_offset+m_scrn_reg.ank_sel*0x0800]>>(7-xi) & (pen_mask & 4)>>2;
if(m_scrn_reg.ank_sel)
{
if((yi >= 16 && m_scrn_reg.v400_mode == 0) || (yi >= 32 && m_scrn_reg.v400_mode == 1))
pen[0] = pen[1] = pen[2] = 0;
}
else
{
if((yi >= 8 && m_scrn_reg.v400_mode == 0) || (yi >= 16 && m_scrn_reg.v400_mode == 1))
pen[0] = pen[1] = pen[2] = 0;
}
}
pcg_pen = pen[2]<<2|pen[1]<<1|pen[0]<<0;
if(color & 0x10 && m_screen->frame_number() & 0x10) //reverse flickering
pcg_pen^=7;
if(pcg_pen == 0 && (!(color & 8)))
continue;
if(color & 8) //revert the used color pen
pcg_pen^=7;
if((m_scrn_reg.blackclip & 8) && (color == (m_scrn_reg.blackclip & 7)))
pcg_pen = 0; // clip the pen to black
res_x = x*8+xi*(width+1);
res_y = y*(mc6845_tile_height)+yi;
if(res_y < cliprect.min_y || res_y > cliprect.max_y) // partial update, TODO: optimize
continue;
x1_draw_pixel(bitmap,res_y,res_x,pcg_pen,width,0);
}
}
}
if(width) //skip next char if we are under double width condition
x++;
}
}
}
/*
* Priority Mixer Calculation (pri)
*
* If pri is 0xff then the bitmap entirely covers the tilemap, if it's 0x00 then
* the tilemap priority is entirely above the bitmap. Any other value mixes the
* bitmap and the tilemap priorities based on the pen value, bit 0 = entry 0 <-> bit 7 = entry 7
* of the bitmap.
*
*/
int x1_state::priority_mixer_pri(int color)
{
int pri_i,pri_mask_calc;
pri_i = 0;
pri_mask_calc = 1;
while(pri_i < 7)
{
if((color & 7) == pri_i)
break;
pri_i++;
pri_mask_calc<<=1;
}
return pri_mask_calc;
}
void x1_state::draw_gfxbitmap(bitmap_rgb32 &bitmap,const rectangle &cliprect, int plane,int pri)
{
int xi,yi,x,y;
int pen_r,pen_g,pen_b,color;
int pri_mask_val;
uint8_t x_size,y_size;
int gfx_offset;
x_size = mc6845_h_display;
y_size = mc6845_v_display;
if(x_size == 0 || y_size == 0)
return; //don't bother if screen is off
if(x_size != 80 && x_size != 40 && y_size != 25)
popmessage("%d %d",x_size,y_size);
//popmessage("%04x %02x",mc6845_start_addr,mc6845_tile_height);
for (y=0;y<y_size;y++)
{
for(x=0;x<x_size;x++)
{
for(yi=0;yi<(mc6845_tile_height);yi++)
{
for(xi=0;xi<8;xi++)
{
gfx_offset = ((x+(y*x_size)) + mc6845_start_addr) & 0x7ff;
gfx_offset+= ((yi >> m_scrn_reg.v400_mode) * 0x800) & 0x3fff;
pen_b = (m_gfx_bitmap_ram[gfx_offset+0x0000+plane*0xc000]>>(7-xi)) & 1;
pen_r = (m_gfx_bitmap_ram[gfx_offset+0x4000+plane*0xc000]>>(7-xi)) & 1;
pen_g = (m_gfx_bitmap_ram[gfx_offset+0x8000+plane*0xc000]>>(7-xi)) & 1;
color = (pen_g<<2 | pen_r<<1 | pen_b<<0) | 8;
pri_mask_val = priority_mixer_pri(color);
if(pri_mask_val & pri) continue;
if((color == 8 && m_scrn_reg.blackclip & 0x10) || (color == 9 && m_scrn_reg.blackclip & 0x20)) // bitmap color clip to black conditions
color = 0;
if(y*(mc6845_tile_height)+yi < cliprect.min_y || y*(mc6845_tile_height)+yi > cliprect.max_y) // partial update TODO: optimize
continue;
x1_draw_pixel(bitmap,y*(mc6845_tile_height)+yi,x*8+xi,color,0,0);
}
}
}
}
}
uint32_t x1_state::screen_update_x1(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
bitmap.fill(rgb_t(0xff,0x00,0x00,0x00), cliprect);
/* TODO: correct calculation thru mc6845 regs */
m_xstart = ((mc6845_h_char_total - mc6845_h_sync_pos) * 8) / 2;
m_ystart = ((mc6845_v_char_total - mc6845_v_sync_pos) * 8) / 2;
// popmessage("%d %d %d %d",mc6845_h_sync_pos,mc6845_v_sync_pos,mc6845_h_char_total,mc6845_v_char_total);
draw_gfxbitmap(bitmap,cliprect,m_scrn_reg.disp_bank,m_scrn_reg.pri);
draw_fgtilemap(bitmap,cliprect);
draw_gfxbitmap(bitmap,cliprect,m_scrn_reg.disp_bank,m_scrn_reg.pri^0xff);
return 0;
}