kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
156 wiersze
4.0 KiB
C
156 wiersze
4.0 KiB
C
/*
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Copyright (C) 2000, 2001 Charles MacDonald
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "shared.h"
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t_bitmap bitmap;
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t_input input;
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t_snd pcesnd;
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/* Pass 0 for no sound, or 8000-44100 for desired sample rate */
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/* No error checking at the moment... */
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int system_init(int sample_rate)
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{
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pce_init();
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vdc_init();
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psg_init();
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render_init();
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#ifdef SOUND_PRESENT
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audio_init(sample_rate);
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#endif
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return (1);
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}
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#ifdef SOUND_PRESENT
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void audio_init(int rate)
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{
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memset(&pcesnd, 0, sizeof(pcesnd));
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/* Exit if no sound or invalid sample rate */
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if(!rate || ((rate < 8000) || (rate > 44100))) return;
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else
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{
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/* Buffer size = sample rate / frames per second */
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//pcesnd.buffer_size = (rate / 60);
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/* Keep local copy of sample rate for sound emulation */
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//pcesnd.sample_rate = rate;
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/* Allocate left channel buffer */
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//pcesnd.buffer[0] = emu_Malloc(pcesnd.buffer_size * sizeof(int16));
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//if(!pcesnd.buffer[0]) return;
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/* Allocate right channel buffer */
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//pcesnd.buffer[1] = emu_Malloc(pcesnd.buffer_size * sizeof(int16));
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//if(!pcesnd.buffer[1]) return;
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/* Set audio enable flag */
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pcesnd.enabled = 1;
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}
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}
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#endif
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void system_frame(int skip)
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{
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int line;
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for(y_offset = byr, line = 0; line < 262; line += 1)
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{
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// DEBUGLOG("system_frame 1\n");
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if((line + 64) == (reg[6] & 0x3FF))
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{
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if(reg[5] & 0x04)
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{
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status |= STATUS_RR;
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h6280_set_irq_line(0, ASSERT_LINE);
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}
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}
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// DEBUGLOG("system_frame 2\n");
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/* VBlank */
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if(line == 240)
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{
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if(dvssr_trigger || (reg[0x0F] & 0x10))
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{
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/* Clear DVSSR write trigger */
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dvssr_trigger = 0;
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/* Copy VRAM to object RAM */
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memcpy(objram, &vram[(reg[0x13] << 1) & 0xFFFE], 0x200);
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/* Cause transfer complete interrupt if necessary */
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if(reg[0x0F] & 0x01)
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{
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status |= STATUS_DS;
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h6280_set_irq_line(0, ASSERT_LINE);
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}
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/* Precalculate sprite data for the next frame */
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make_sprite_list();
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}
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/* Cause VBlank interrupt if necessary */
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if(reg[5] & 0x0008)
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{
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status |= STATUS_VD;
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h6280_set_irq_line(0, ASSERT_LINE);
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}
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}
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// DEBUGLOG("system_frame 3\n");
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/* 7.16 MHz = 455 cycles per line */
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h6280_execute(455);
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// DEBUGLOG("system_frame 4\n");
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/* Render a line of the display */
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if((line < disp_height) && (!skip)) {
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render_line(line);
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}
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// DEBUGLOG("system_frame 5\n");
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/* Update internal line counter and wrap */
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y_offset = (y_offset + 1) & playfield_col_mask;
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}
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}
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void pce_sound(void)
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{
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/* Update audio */
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if(pcesnd.enabled) psg_update(pcesnd.buffer[0], pcesnd.buffer[1], pcesnd.buffer_size);
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}
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void system_reset(void)
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{
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pce_reset();
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vdc_reset();
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psg_reset();
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render_reset();
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}
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void system_shutdown(void)
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{
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pce_shutdown();
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vdc_shutdown();
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psg_shutdown();
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render_shutdown();
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}
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