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graphics.c
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graphics.c
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#include "stdafx.h"
/*=====================================================================
graphics.c -> This file includes all the graphical functions
for the ASpectrum emulator.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Copyright (c) 2000 Santiago Romero Iglesias.
Email: [email protected]
======================================================================*/
#ifdef _DEBUG_
#include <mss.h>
#endif
#include <stdio.h>
#include <string.h>
#include "v_alleg.h"
#include "z80.h"
#include "mem.h"
#include "main.h"
#include "graphics.h"
extern Z80Regs spectrumZ80;
extern tipo_mem mem;
//extern void ExitEmulator (void);
//extern byte *RAM;
//extern unsigned short int Pixeles[192];
//extern unsigned short int Atributos[192];
///extern int cycle;
//extern volatile int frame_counter;
//extern volatile int target_cycle;
//extern volatile int last_fps;
//extern void target_incrementor ();
//extern void count_frames ();
//unsigned int colors[256];
/*-----------------------------------------------------------------
Redraw the entire screen from the speccy's VRAM.
It reads the from the 16384 memory address the bytes of the
VideoRAM needed to rebuild the screen and the border.
------------------------------------------------------------------*/
void
DisplayScreen (Z80Regs * regs)
{
int y;
extern int v_border;
extern int v_res;
static int f_flash = 1, f_flash2 = 0;
f_flash2 = (f_flash2++) % 32;
if (f_flash2 < 16)
f_flash = 1;
else
f_flash = 0;
gacquire_bitmap ();
// COMMENTS:
// 1.- is it needed to adquire and release bitmap with vscreens?
// 2.- why don't we use vram for vscreen?
for (y = 0; y < v_border; y++)
{
displayborderscanline (y);
displayborderscanline (v_res - 1 - y);
}
for (y = 0; y < 192; y++)
displayscanline2 (y, f_flash, regs);
grelease_bitmap ();
}
/*-------------------------------------------------------------------------*/
void
displayborderscanline (int y)
{
ghline (0, y, 319, spectrumZ80.BorderColor);
}
/*-------------------------------------------------------------------------*/
void
displayscanline2 (int y, int f_flash, Z80Regs * regs)
{
int x, row, col, dir_p, dir_a, pixeles, tinta, papel, atributos;
extern int v_border;
extern tipo_hwopt hwopt;
row = y + v_border; // 4 & 32 = graphical screen offset
col = 32; // 32+256+32=320 4+192+4=200 (res=320x200)
//ASprintf("*---\n");
ghline (0, row, 31, spectrumZ80.BorderColor);
//ASprintf("---*\n");
ghline (288, row, 319, spectrumZ80.BorderColor);
//ASprintf("-***-\n");
dir_p = ((y & 0xC0) << 5) + ((y & 0x07) << 8) + ((y & 0x38) << 2);
dir_a = 0x1800 + (32 * (y >> 3));
#ifdef MODE128K
if (!regs->shadow_screen) {
pixel_ptr = spectrumZ80.RAMbank[5];
pixel_ptr += dir_p;
attr_ptr = spectrumZ80.RAMbank[5];
attr_ptr += dir_a;
} else {
pixel_ptr = spectrumZ80.RAMbank[7];
pixel_ptr += dir_p;
attr_ptr = spectrumZ80.RAMbank[7];
attr_ptr += dir_a;
}
for (x = 0; x < 32; x++)
{
pixeles = regs->RAM[dir_p++];
atributos = regs->RAM[dir_a++];
#else
for (x = 0; x < 32; x++)
{
pixeles= readvmem(dir_p++,hwopt.videopage);
atributos=readvmem(dir_a++,hwopt.videopage);
// pixeles= *(mem.p+mem.vo[0]+dir_p++); // el valor de 0 debe variar en los modos 128K
// atributos=*(mem.p+mem.vo[0]+dir_a++);
#endif
if (((atributos & 0x80) == 0) || (f_flash == 0)) {
tinta = (atributos & 0x07) + ((atributos & 0x40) >> 3);
papel = (atributos & 0x78) >> 3;
} else {
papel = (atributos & 0x07) + ((atributos & 0x40) >> 3);
tinta = (atributos & 0x78) >> 3;
}
gPutPixel (col++, row, ((pixeles & 0x80) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x40) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x20) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x10) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x08) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x04) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x02) ? tinta : papel));
gPutPixel (col++, row, ((pixeles & 0x01) ? tinta : papel));
}
}
/*-----------------------------------------------------------------
Redraw a single scanline of screen from the speccy's VRAM.
------------------------------------------------------------------*/
void
DisplayScanLine (int linea, Z80Regs * regs)
{
gacquire_bitmap ();
displayscanline2 (linea, 0, regs);
grelease_bitmap ();
}
/*-----------------------------------------------------------------
Clear the screen with an specified colour (colores[] based).
------------------------------------------------------------------*/
void ClearScreen (int color){
gclear_to_color (color);
}
/*-----------------------------------------------------------------
void PutChar8x16(x, y, ascii, fuente, fg_color, bg_color );
Writes the character (ascii) in colors fg=fg_color, bg=bg_color
using the font (font) into the (x,y) screen coordinates.
------------------------------------------------------------------*/
void
PutChar8x16 (int x, int y, unsigned char ascii,
char *font, unsigned long fg_color, unsigned long bg_color)
{
char height, car, charheight;
int pos, f;
height = 16;
charheight = 8;
pos = (height * (ascii));
/* draw all the individual pixels of the character */
for (f = 0; f < charheight; f++)
{
car = font[pos + f];
if (car & 0x80)
{
gPutPixel (x, y + f, fg_color);
}
else
{
gPutPixel (x, y + f, bg_color);
}
if (car & 0x40)
{
gPutPixel (x + 1, y + f, fg_color);
}
else
{
gPutPixel (x + 1, y + f, bg_color);
}
if (car & 0x20)
{
gPutPixel (x + 2, y + f, fg_color);
}
else
{
gPutPixel (x + 2, y + f, bg_color);
}
if (car & 0x10)
{
gPutPixel (x + 3, y + f, fg_color);
}
else
{
gPutPixel (x + 3, y + f, bg_color);
}
if (car & 0x08)
{
gPutPixel (x + 4, y + f, fg_color);
}
else
{
gPutPixel (x + 4, y + f, bg_color);
}
if (car & 0x04)
{
gPutPixel (x + 5, y + f, fg_color);
}
else
{
gPutPixel (x + 5, y + f, bg_color);
}
if (car & 0x02)
{
gPutPixel (x + 6, y + f, fg_color);
}
else
{
gPutPixel (x + 6, y + f, bg_color);
}
if (car & 0x01)
{
gPutPixel (x + 7, y + f, fg_color);
}
else
{
gPutPixel (x + 7, y + f, bg_color);
}
}
}
/*-----------------------------------------------------------------
void GFXprintf( x, y, *sentence, *font, fg_color, bg_color, incr);
Writes to the screen the string pointed by sentence at (x,y)
using the specified colours and font increments (like -1).
------------------------------------------------------------------*/
void
GFXprintf (int x, int y, char *sentence, char *font,
char fg_color, char bg_color, char incr)
{
unsigned long longi;
unsigned long ink32, paper32;
int f, pos, nx;
ink32 = fg_color;
paper32 = bg_color;
x -= 2;
incr += 8;
longi = strlen (sentence);
/* write all the characters to screen */
for (f = 0, nx = x; f < longi; f++, nx += incr)
{
pos = x + (f << 3);
PutChar8x16 (nx, y, sentence[f], font, ink32, paper32);
}
gUpdateRect (x, y, nx - x, 16);
}
/*-----------------------------------------------------------------
void GFXprintf( x, y, *sentence, *font, fg_color, bg_color, incr);
Writes to the screen the string pointed by sentence at (x,y)
using the specified colours and font increments (like -1).
------------------------------------------------------------------*/
void
GFXprintf_tovideo (int x, int y, char *sentence, char *font,
char fg_color, char bg_color, char incr)
{
unsigned long longi;
unsigned long ink32, paper32;
int f, pos, nx;
ink32 = fg_color;
paper32 = bg_color;
x -= 2;
incr += 8;
longi = strlen (sentence);
/* write all the characters to screen */
for (f = 0, nx = x; f < longi; f++, nx += incr)
{
pos = x + (f << 3);
PutChar8x16 (nx, y, sentence[f], font, ink32, paper32);
}
}
/*-----------------------------------------------------------------
int GFXgets( x, y, *cadena, *font, fg_color, bg_color, max );
This function reads a string from the keyboard (reads up to
max-1 characters) allowing simple input commands (delete,
enter, etc.).
------------------------------------------------------------------*/
//PENDING se necesita esto para algo?
int GFXgets (int x, int y, char *cadena, char *font,
int fg_color, int bg_color, int max)
{
char car, tecla = 0;
int offs = 0;
/* Draw initial cursor. */
PutChar8x16 (x + (offs * 8), y, '_', font, fg_color, bg_color);
gUpdateRect (x + (offs * 8), y, 8, 16);
/* while the user does not press ENTER... */
while (!gkeypressed(gKEY_ENTER))
{
tecla = 0; // PENDING readkey ();
if ((tecla >= ' ' && tecla <= 125) && offs < max - 2)
{
cadena[offs] = tecla;
cadena[offs + 1] = '\0';
// erase cursor
if (offs < max - 1)
PutChar8x16 (x + (offs * 8), y, '_', font, fg_color, bg_color);
// draw pressed key
PutChar8x16 (x + (offs * 8), y, tecla, font, fg_color, bg_color);
if (offs < max - 2)
PutChar8x16 (x + ((offs + 1) * 8), y, '_', font, fg_color,
bg_color);
// advance cursor
if (offs < max - 2)
offs++;
}
// if the user presses BACKSPACE...
else if (tecla == '\b' && offs > 0)
{
PutChar8x16 (x + (offs * 8), y, ' ', font, bg_color, bg_color);
offs--;
car = cadena[offs];
cadena[offs] = '\0';
PutChar8x16 (x + (offs * 8), y, '_', font, fg_color, bg_color);
}
gUpdateRect (x, y, max * 8, 16);
// if the user presses ENTER, end edition
if ((gkeypressed(gKEY_ENTER)) && offs > 0)
{
cadena[offs + 1] = '\0';
return (offs);
}
}
return 0;
}