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-rw-r--r--src/mame/video/x1.cpp354
1 files changed, 354 insertions, 0 deletions
diff --git a/src/mame/video/x1.cpp b/src/mame/video/x1.cpp
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+++ b/src/mame/video/x1.cpp
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+// 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
+ *
+ *************************************/
+
+VIDEO_START_MEMBER(x1_state,x1)
+{
+ m_avram = make_unique_clear<uint8_t[]>(0x800);
+ m_tvram = make_unique_clear<uint8_t[]>(0x800);
+ m_kvram = make_unique_clear<uint8_t[]>(0x800);
+ m_gfx_bitmap_ram = make_unique_clear<uint8_t[]>(0xc000*2);
+ 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;
+}