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// license:BSD-3-Clause
// copyright-holders:Dan Boris
/***************************************************************************
Atari I, Robot hardware
***************************************************************************/
#include "emu.h"
#include "includes/irobot.h"
#define BITMAP_WIDTH 256
/***************************************************************************
Convert the color PROMs into a more useable format.
5 bits from polygon ram address the palette ram
Output of color RAM
bit 8 -- inverter -- 1K ohm resistor -- RED
bit 7 -- inverter -- 2.2K ohm resistor -- RED
-- inverter -- 1K ohm resistor -- GREEN
-- inverter -- 2.2K ohm resistor -- GREEN
-- inverter -- 1K ohm resistor -- BLUE
-- inverter -- 2.2K ohm resistor -- BLUE
-- inverter -- 2.2K ohm resistor -- INT
-- inverter -- 4.7K ohm resistor -- INT
bit 0 -- inverter -- 9.1K ohm resistor -- INT
Alphanumeric colors are generated by ROM .125, it's outputs are connected
to bits 1..8 as above. The inputs are:
A0..1 - Character color
A2 - Character image (1=pixel on/0=off)
A3..4 - Alphamap 0,1 (appears that only Alphamap1 is used, it is set by
the processor)
***************************************************************************/
void irobot_state::irobot_palette(palette_device &palette) const
{
uint8_t const *const color_prom = memregion("proms")->base();
// convert the color prom for the text palette
for (unsigned i = 0; i < 32; i++)
{
int const intensity = color_prom[i] & 0x03;
int const r = 28 * ((color_prom[i] >> 6) & 0x03) * intensity;
int const g = 28 * ((color_prom[i] >> 4) & 0x03) * intensity;
int const b = 28 * ((color_prom[i] >> 2) & 0x03) * intensity;
int const swapped_i = bitswap<8>(i,7,6,5,4,3,0,1,2);
palette.set_pen_color(swapped_i + 64, rgb_t(r, g, b));
}
}
void irobot_state::irobot_paletteram_w(offs_t offset, uint8_t data)
{
int r,g,b;
int bits,intensity;
uint32_t color;
color = ((data << 1) | (offset & 0x01)) ^ 0x1ff;
intensity = color & 0x07;
bits = (color >> 3) & 0x03;
b = 12 * bits * intensity;
bits = (color >> 5) & 0x03;
g = 12 * bits * intensity;
bits = (color >> 7) & 0x03;
r = 12 * bits * intensity;
m_palette->set_pen_color((offset >> 1) & 0x3F,rgb_t(r,g,b));
}
void irobot_state::irobot_poly_clear(uint8_t *bitmap_base)
{
memset(bitmap_base, 0, BITMAP_WIDTH * m_screen->height());
}
void irobot_state::irobot_poly_clear()
{
uint8_t *bitmap_base = m_bufsel ? m_polybitmap2.get() : m_polybitmap1.get();
irobot_poly_clear(bitmap_base);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void irobot_state::video_start()
{
/* Setup 2 bitmaps for the polygon generator */
int height = m_screen->height();
m_polybitmap1 = std::make_unique<uint8_t[]>(BITMAP_WIDTH * height);
m_polybitmap2 = std::make_unique<uint8_t[]>(BITMAP_WIDTH * height);
/* clear the bitmaps so we start with valid palette look-up values for drawing */
irobot_poly_clear(m_polybitmap1.get());
irobot_poly_clear(m_polybitmap2.get());
/* Set clipping */
m_ir_xmin = m_ir_ymin = 0;
m_ir_xmax = m_screen->width();
m_ir_ymax = m_screen->height();
}
/***************************************************************************
Polygon Generator (Preliminary information)
The polygon communication ram works as follows (each location is a 16-bit word):
0000-xxxx: Object pointer table
bits 00..10: Address of object data
bits 12..15: Object type
0x4 = Polygon
0x8 = Point
0xC = Vector
(0xFFFF means end of table)
Point Object:
Word 0, bits 0..15: X Position (0xFFFF = end of point objects)
Word 1, bits 7..15: Y Position
bits 0..5: Color
Vector Object:
Word 0, bits 7..15: Ending Y (0xFFFF = end of line objects)
Word 1, bits 7..15: Starting Y
bits 0..5: Color
Word 2: Slope
Word 3, bits 0..15: Starting X
Polygon Object:
Word 0, bits 0..10: Pointer to second slope list
Word 1, bits 0..15: Starting X first vector
Word 2, bits 0..15: Starting X second vector
Word 3, bits 0..5: Color
bits 7..15: Initial Y value
Slope Lists: (one starts at Word 4, other starts at pointer in Word 0)
Word 0, Slope (0xFFFF = side done)
Word 1, bits 7..15: Ending Y of vector
Each side is a continuous set of vectors. Both sides are drawn at
the same time and the space between them is filled in.
***************************************************************************/
#define draw_pixel(x,y,c) polybitmap[(y) * BITMAP_WIDTH + (x)] = (c)
#define fill_hline(x1,x2,y,c) memset(&polybitmap[(y) * BITMAP_WIDTH + (x1)], (c), (x2) - (x1) + 1)
/*
Line draw routine
modified from a routine written by Andrew Caldwell
*/
void irobot_state::draw_line(uint8_t *polybitmap, int x1, int y1, int x2, int y2, int col)
{
int dx,dy,sx,sy,cx,cy;
dx = abs(x1-x2);
dy = abs(y1-y2);
sx = (x1 <= x2) ? 1: -1;
sy = (y1 <= y2) ? 1: -1;
cx = dx/2;
cy = dy/2;
if (dx>=dy)
{
for (;;)
{
if (x1 >= m_ir_xmin && x1 < m_ir_xmax && y1 >= m_ir_ymin && y1 < m_ir_ymax)
draw_pixel (x1, y1, col);
if (x1 == x2) break;
x1 += sx;
cx -= dy;
if (cx < 0)
{
y1 += sy;
cx += dx;
}
}
}
else
{
for (;;)
{
if (x1 >= m_ir_xmin && x1 < m_ir_xmax && y1 >= m_ir_ymin && y1 < m_ir_ymax)
draw_pixel (x1, y1, col);
if (y1 == y2) break;
y1 += sy;
cy -= dx;
if (cy < 0)
{
x1 += sx;
cy += dy;
}
}
}
}
#define ROUND_TO_PIXEL(x) ((x >> 7) - 128)
void irobot_state::irobot_run_video()
{
uint8_t *polybitmap;
uint16_t *combase16 = (uint16_t *)m_combase;
int sx,sy,ex,ey,sx2,ey2;
int color;
uint32_t d1;
int lpnt,spnt,spnt2;
int shp;
int32_t word1,word2;
logerror("Starting Polygon Generator, Clear=%d\n",m_vg_clear);
if (m_bufsel)
polybitmap = m_polybitmap2.get();
else
polybitmap = m_polybitmap1.get();
lpnt=0;
while (lpnt < 0x7ff)
{
d1 = combase16[lpnt++];
if (d1 == 0xffff) break;
spnt = d1 & 0x07ff;
shp = (d1 & 0xf000) >> 12;
/* pixel */
if (shp == 0x8)
{
while (spnt < 0x7ff)
{
sx = combase16[spnt];
if (sx == 0xffff) break;
sy = combase16[spnt+1];
color = sy & 0x3f;
sx = ROUND_TO_PIXEL(sx);
sy = ROUND_TO_PIXEL(sy);
if (sx >= m_ir_xmin && sx < m_ir_xmax && sy >= m_ir_ymin && sy < m_ir_ymax)
draw_pixel(sx,sy,color);
spnt+=2;
}//while object
}//if point
/* line */
if (shp == 0xc)
{
while (spnt < 0x7ff)
{
ey = combase16[spnt];
if (ey == 0xffff) break;
ey = ROUND_TO_PIXEL(ey);
sy = combase16[spnt+1];
color = sy & 0x3f;
sy = ROUND_TO_PIXEL(sy);
sx = combase16[spnt+3];
word1 = (int16_t)combase16[spnt+2];
ex = sx + word1 * (ey - sy + 1);
draw_line(polybitmap, ROUND_TO_PIXEL(sx),sy,ROUND_TO_PIXEL(ex),ey,color);
spnt+=4;
}//while object
}//if line
/* polygon */
if (shp == 0x4)
{
spnt2 = combase16[spnt] & 0x7ff;
sx = combase16[spnt+1];
sx2 = combase16[spnt+2];
sy = combase16[spnt+3];
color = sy & 0x3f;
sy = ROUND_TO_PIXEL(sy);
spnt+=4;
word1 = (int16_t)combase16[spnt];
ey = combase16[spnt+1];
if (word1 != -1 || ey != 0xffff)
{
ey = ROUND_TO_PIXEL(ey);
spnt+=2;
// sx += word1;
word2 = (int16_t)combase16[spnt2];
ey2 = ROUND_TO_PIXEL(combase16[spnt2+1]);
spnt2+=2;
// sx2 += word2;
while(1)
{
if (sy >= m_ir_ymin && sy < m_ir_ymax)
{
int x1 = ROUND_TO_PIXEL(sx);
int x2 = ROUND_TO_PIXEL(sx2);
int temp;
if (x1 > x2) temp = x1, x1 = x2, x2 = temp;
if (x1 < m_ir_xmin) x1 = m_ir_xmin;
if (x2 >= m_ir_xmax) x2 = m_ir_xmax - 1;
if (x1 < x2)
fill_hline(x1 + 1, x2, sy, color);
}
sy++;
if (sy > ey)
{
word1 = (int16_t)combase16[spnt];
ey = combase16[spnt+1];
if (word1 == -1 && ey == 0xffff)
break;
ey = ROUND_TO_PIXEL(ey);
spnt+=2;
}
else
sx += word1;
if (sy > ey2)
{
word2 = (int16_t)combase16[spnt2];
ey2 = ROUND_TO_PIXEL(combase16[spnt2+1]);
spnt2+=2;
}
else
sx2 += word2;
} //while polygon
}//if at least 2 sides
} //if polygon
} //while object
}
uint32_t irobot_state::screen_update_irobot(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
uint8_t *videoram = m_videoram;
uint8_t *bitmap_base = m_bufsel ? m_polybitmap1.get() : m_polybitmap2.get();
int x, y, offs;
/* copy the polygon bitmap */
for (y = cliprect.top(); y <= cliprect.bottom(); y++)
draw_scanline8(bitmap, 0, y, BITMAP_WIDTH, &bitmap_base[y * BITMAP_WIDTH], nullptr);
/* redraw the non-zero characters in the alpha layer */
for (y = offs = 0; y < 32; y++)
for (x = 0; x < 32; x++, offs++)
{
int code = videoram[offs] & 0x3f;
int color = ((videoram[offs] & 0xc0) >> 6) | (m_alphamap >> 3);
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code, color,
0,0,
8*x,8*y,0);
}
return 0;
}
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