mirror of
https://github.com/smartykit/apple1.git
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518 lines
13 KiB
C++
518 lines
13 KiB
C++
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/*
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Copyright (c) 2010 Myles Metzer
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "video_gen.h"
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#include "spec/asm_macros.h"
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//#define REMOVE6C
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//#define REMOVE5C
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//#define REMOVE4C
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//#define REMOVE3C
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int renderLine;
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TVout_vid display;
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void (*render_line)();
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void (*line_handler)();
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void (*hbi_hook)() = ∅
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void (*vbi_hook)() = ∅
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// sound properties
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volatile long remainingToneVsyncs;
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void empty() {
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}
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// start timer
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void render_setup(uint8_t mode, uint8_t x, uint8_t y, uint8_t *scrnptr) {
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display.screen = scrnptr;
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display.hres = x;
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display.vres = y;
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display.frames = 0;
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if (mode) {
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display.vscale_const = _PAL_LINE_DISPLAY / display.vres - 1;
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} else {
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display.vscale_const = _NTSC_LINE_DISPLAY / display.vres - 1;
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}
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display.vscale = display.vscale_const;
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// selects the widest render method that fits in 46us
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// as of 9/16/10 rendermode 3 will not work for resolutions lower than
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// 192(display.hres lower than 24)
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unsigned char rmethod = (_TIME_ACTIVE*_CYCLES_PER_US) / (display.hres * 8);
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switch(rmethod) {
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case 6:
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render_line = &render_line6c;
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break;
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case 5:
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render_line = &render_line5c;
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break;
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case 4:
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render_line = &render_line4c;
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break;
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case 3:
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render_line = &render_line3c;
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break;
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default:
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if (rmethod > 6) {
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render_line = &render_line6c;
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} else {
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render_line = &render_line3c;
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}
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}
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DDR_VID |= _BV(VID_PIN);
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DDR_SYNC |= _BV(SYNC_PIN);
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PORT_VID &= ~_BV(VID_PIN);
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PORT_SYNC |= _BV(SYNC_PIN);
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// for tone generation
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DDR_SND |= _BV(SND_PIN);
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// inverted fast pwm mode on timer 1
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TCCR1A = _BV(COM1A1) | _BV(COM1A0) | _BV(WGM11);
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TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10);
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if (mode) {
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display.start_render = _PAL_LINE_MID - ((display.vres * (display.vscale_const + 1)) / 2);
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display.output_delay = _PAL_CYCLES_OUTPUT_START;
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display.vsync_end = _PAL_LINE_STOP_VSYNC;
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display.lines_frame = _PAL_LINE_FRAME;
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ICR1 = _PAL_CYCLES_SCANLINE;
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OCR1A = _CYCLES_HORZ_SYNC;
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} else {
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display.start_render = _NTSC_LINE_MID - ((display.vres * (display.vscale_const+1))/2) + 8;
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display.output_delay = _NTSC_CYCLES_OUTPUT_START;
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display.vsync_end = _NTSC_LINE_STOP_VSYNC;
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display.lines_frame = _NTSC_LINE_FRAME;
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ICR1 = _NTSC_CYCLES_SCANLINE;
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OCR1A = _CYCLES_HORZ_SYNC;
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}
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display.scanLine = display.lines_frame + 1;
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line_handler = &vsync_line;
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TIMSK1 = _BV(TOIE1);
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sei();
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}
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// render a line
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ISR(TIMER1_OVF_vect) {
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hbi_hook();
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line_handler();
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}
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// вызываем синхронизацию или прорисовку строки
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void blank_line() {
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if (display.scanLine == display.start_render) {
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renderLine = 0;
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display.vscale = display.vscale_const;
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line_handler = &active_line;
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} else if (display.scanLine == display.lines_frame) {
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line_handler = &vsync_line;
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vbi_hook();
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}
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display.scanLine++;
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}
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void active_line() {
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wait_until(display.output_delay);
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render_line();
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if (!display.vscale) {
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display.vscale = display.vscale_const;
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renderLine += display.hres;
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} else {
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display.vscale--;
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}
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if ((display.scanLine + 1) == (int)(display.start_render + (display.vres * (display.vscale_const + 1)))) {
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line_handler = &blank_line;
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}
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display.scanLine++;
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}
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// генерируем синхроимпульс
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void vsync_line() {
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if (display.scanLine >= display.lines_frame) {
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OCR1A = _CYCLES_VIRT_SYNC;
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display.scanLine = 0;
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display.frames++;
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if (remainingToneVsyncs != 0) {
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if (remainingToneVsyncs > 0) {
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remainingToneVsyncs--;
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}
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} else {
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// stop the tone
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TCCR2B = 0;
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PORTB &= ~(_BV(SND_PIN));
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}
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} else if (display.scanLine == display.vsync_end) {
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OCR1A = _CYCLES_HORZ_SYNC;
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line_handler = &blank_line;
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}
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display.scanLine++;
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}
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static void inline wait_until(uint8_t time) {
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__asm__ __volatile__ (
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"subi %[time], 10\n"
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"sub %[time], %[tcnt1l]\n\t"
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"100:\n\t"
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"subi %[time], 3\n\t"
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"brcc 100b\n\t"
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"subi %[time], 0-3\n\t"
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"breq 101f\n\t"
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"dec %[time]\n\t"
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"breq 102f\n\t"
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"rjmp 102f\n"
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"101:\n\t"
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"nop\n"
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"102:\n"
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:
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: [time] "a" (time),
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[tcnt1l] "a" (TCNT1L)
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);
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}
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void render_line6c() {
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#ifndef REMOVE6C
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__asm__ __volatile__ (
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"ADD r26,r28\n\t"
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"ADC r27,r29\n\t"
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// save PORTB
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"svprt %[port]\n\t"
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"rjmp enter6\n"
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"loop6:\n\t"
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// 8
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"bst __tmp_reg__,0\n\t"
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"o1bs %[port]\n"
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"enter6:\n\t"
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// 1
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"LD __tmp_reg__,X+\n\t"
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"delay1\n\t"
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"bst __tmp_reg__,7\n\t"
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"o1bs %[port]\n\t"
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// 2
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"delay3\n\t"
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"bst __tmp_reg__,6\n\t"
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"o1bs %[port]\n\t"
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// 3
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"delay3\n\t"
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"bst __tmp_reg__,5\n\t"
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"o1bs %[port]\n\t"
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// 4
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"delay3\n\t"
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"bst __tmp_reg__,4\n\t"
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"o1bs %[port]\n\t"
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// 5
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"delay3\n\t"
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"bst __tmp_reg__,3\n\t"
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"o1bs %[port]\n\t"
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// 6
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"delay3\n\t"
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"bst __tmp_reg__,2\n\t"
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"o1bs %[port]\n\t"
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// 7
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"delay3\n\t"
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"bst __tmp_reg__,1\n\t"
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"o1bs %[port]\n\t"
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"dec %[hres]\n\t"
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// go too loopsix
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"brne loop6\n\t"
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"delay2\n\t"
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// 8
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"bst __tmp_reg__,0\n\t"
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"o1bs %[port]\n"
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"svprt %[port]\n\t"
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BST_HWS
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"o1bs %[port]\n\t"
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:
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: [port] "i" (_SFR_IO_ADDR(PORT_VID)),
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"x" (display.screen),
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"y" (renderLine),
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[hres] "d" (display.hres)
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: "r16" // try to remove this clobber later...
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);
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#endif
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}
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void render_line5c() {
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#ifndef REMOVE5C
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__asm__ __volatile__ (
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"ADD r26,r28\n\t"
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"ADC r27,r29\n\t"
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// save PORTB
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"svprt %[port]\n\t"
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"rjmp enter5\n"
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"loop5:\n\t"
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// 8
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"bst __tmp_reg__,0\n\t"
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"o1bs %[port]\n"
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"enter5:\n\t"
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// 1
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"LD __tmp_reg__,X+\n\t"
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"bst __tmp_reg__,7\n\t"
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"o1bs %[port]\n\t"
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// 2
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"delay2\n\t"
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"bst __tmp_reg__,6\n\t"
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"o1bs %[port]\n\t"
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// 3
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"delay2\n\t"
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"bst __tmp_reg__,5\n\t"
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"o1bs %[port]\n\t"
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// 4
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"delay2\n\t"
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"bst __tmp_reg__,4\n\t"
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"o1bs %[port]\n\t"
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// 5
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"delay2\n\t"
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"bst __tmp_reg__,3\n\t"
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"o1bs %[port]\n\t"
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// 6
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"delay2\n\t"
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"bst __tmp_reg__,2\n\t"
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"o1bs %[port]\n\t"
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// 7
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"delay1\n\t"
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"dec %[hres]\n\t"
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"bst __tmp_reg__,1\n\t"
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"o1bs %[port]\n\t"
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// go too loop5
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"brne loop5\n\t"
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"delay1\n\t"
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// 8
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"bst __tmp_reg__,0\n\t"
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"o1bs %[port]\n"
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"svprt %[port]\n\t"
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BST_HWS
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"o1bs %[port]\n\t"
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:
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: [port] "i" (_SFR_IO_ADDR(PORT_VID)),
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"x" (display.screen),
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"y" (renderLine),
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[hres] "d" (display.hres)
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: "r16" // try to remove this clobber later...
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);
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#endif
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}
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void render_line4c() {
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#ifndef REMOVE4C
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__asm__ __volatile__ (
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"ADD r26,r28\n\t"
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"ADC r27,r29\n\t"
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"rjmp enter4\n"
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"loop4:\n\t"
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// 8
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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"enter4:\n\t"
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// 1
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"LD __tmp_reg__,X+\n\t"
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"delay1\n\t"
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"out %[port],__tmp_reg__\n\t"
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// 2
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"delay2\n\t"
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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// 3
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"delay2\n\t"
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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// 4
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"delay2\n\t"
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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"delay2\n\t"
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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// 6
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"delay2\n\t"
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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// 7
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"delay1\n\t"
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"lsl __tmp_reg__\n\t"
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"dec %[hres]\n\t"
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"out %[port],__tmp_reg__\n\t"
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// go too loop4
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"brne loop4\n\t"
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// 8
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"delay1\n\t"
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"lsl __tmp_reg__\n\t"
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"out %[port],__tmp_reg__\n\t"
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"delay3\n\t"
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"cbi %[port],7\n\t"
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:
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: [port] "i" (_SFR_IO_ADDR(PORT_VID)),
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"x" (display.screen),
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"y" (renderLine),
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[hres] "d" (display.hres)
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: "r16" // try to remove this clobber later...
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);
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#endif
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}
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// only 16mhz right now!!!
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void render_line3c() {
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#ifndef REMOVE3C
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__asm__ __volatile__ (
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".macro byteshift\n\t"
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"LD __tmp_reg__,X+\n\t"
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// 0
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 1
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 2
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 3
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 4
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 5
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 6
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"out %[port],__tmp_reg__\n\t"
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"nop\n\t"
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"lsl __tmp_reg__\n\t"
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// 7
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"out %[port],__tmp_reg__\n\t"
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".endm\n\t"
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"ADD r26,r28\n\t"
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"ADC r27,r29\n\t"
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// 615
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"cpi %[hres],30\n\t"
|
||
|
"breq skip0\n\t"
|
||
|
"cpi %[hres],29\n\t"
|
||
|
"breq jumpto1\n\t"
|
||
|
"cpi %[hres],28\n\t"
|
||
|
"breq jumpto2\n\t"
|
||
|
"cpi %[hres],27\n\t"
|
||
|
"breq jumpto3\n\t"
|
||
|
"cpi %[hres],26\n\t"
|
||
|
"breq jumpto4\n\t"
|
||
|
"cpi %[hres],25\n\t"
|
||
|
"breq jumpto5\n\t"
|
||
|
"cpi %[hres],24\n\t"
|
||
|
"breq jumpto6\n\t"
|
||
|
"jumpto1:\n\t"
|
||
|
"rjmp skip1\n\t"
|
||
|
"jumpto2:\n\t"
|
||
|
"rjmp skip2\n\t"
|
||
|
"jumpto3:\n\t"
|
||
|
"rjmp skip3\n\t"
|
||
|
"jumpto4:\n\t"
|
||
|
"rjmp skip4\n\t"
|
||
|
"jumpto5:\n\t"
|
||
|
"rjmp skip5\n\t"
|
||
|
"jumpto6:\n\t"
|
||
|
"rjmp skip6\n\t"
|
||
|
"skip0:\n\t"
|
||
|
//1 643
|
||
|
"byteshift\n\t"
|
||
|
"skip1:\n\t"
|
||
|
// 2
|
||
|
"byteshift\n\t"
|
||
|
"skip2:\n\t"
|
||
|
// 3
|
||
|
"byteshift\n\t"
|
||
|
"skip3:\n\t"
|
||
|
// 4
|
||
|
"byteshift\n\t"
|
||
|
"skip4:\n\t"
|
||
|
// 5
|
||
|
"byteshift\n\t"
|
||
|
"skip5:\n\t"
|
||
|
// 6
|
||
|
"byteshift\n\t"
|
||
|
"skip6:\n\t"
|
||
|
// 7
|
||
|
"byteshift\n\t"
|
||
|
// 8
|
||
|
"byteshift\n\t"
|
||
|
// 9
|
||
|
"byteshift\n\t"
|
||
|
// 10
|
||
|
"byteshift\n\t"
|
||
|
// 11
|
||
|
"byteshift\n\t"
|
||
|
// 12
|
||
|
"byteshift\n\t"
|
||
|
// 13
|
||
|
"byteshift\n\t"
|
||
|
// 14
|
||
|
"byteshift\n\t"
|
||
|
// 15
|
||
|
"byteshift\n\t"
|
||
|
// 16
|
||
|
"byteshift\n\t"
|
||
|
// 17
|
||
|
"byteshift\n\t"
|
||
|
// 18
|
||
|
"byteshift\n\t"
|
||
|
// 19
|
||
|
"byteshift\n\t"
|
||
|
// 20
|
||
|
"byteshift\n\t"
|
||
|
// 21
|
||
|
"byteshift\n\t"
|
||
|
// 22
|
||
|
"byteshift\n\t"
|
||
|
// 23
|
||
|
"byteshift\n\t"
|
||
|
// 24
|
||
|
"byteshift\n\t"
|
||
|
// 25
|
||
|
"byteshift\n\t"
|
||
|
// 26
|
||
|
"byteshift\n\t"
|
||
|
// 27
|
||
|
"byteshift\n\t"
|
||
|
// 28
|
||
|
"byteshift\n\t"
|
||
|
// 29
|
||
|
"byteshift\n\t"
|
||
|
// 30
|
||
|
"byteshift\n\t"
|
||
|
"delay2\n\t"
|
||
|
"cbi %[port],7\n\t"
|
||
|
:
|
||
|
: [port] "i" (_SFR_IO_ADDR(PORT_VID)),
|
||
|
"x" (display.screen),
|
||
|
"y" (renderLine),
|
||
|
[hres] "d" (display.hres)
|
||
|
: "r16" // try to remove this clobber later...
|
||
|
);
|
||
|
#endif
|
||
|
}
|