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443 lines
11 KiB
C
443 lines
11 KiB
C
/* SSNES - A Super Ninteno Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <GL/glfw.h>
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#include <samplerate.h>
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#include <libsnes.hpp>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "config.h"
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#include "driver.h"
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#include "hqflt/pastlib.h"
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static bool video_active = true;
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static bool audio_active = true;
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static SRC_STATE* source = NULL;
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//////////////////////////////////////////////// Backends
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extern const audio_driver_t audio_rsound;
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extern const audio_driver_t audio_oss;
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extern const audio_driver_t audio_alsa;
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extern const video_driver_t video_gl;
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////////////////////////////////////////////////
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static driver_t driver = {
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#if VIDEO_DRIVER == VIDEO_GL
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.video = &video_gl,
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#else
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#error "Define a valid video driver in config.h"
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#endif
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#if AUDIO_DRIVER == AUDIO_RSOUND
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.audio = &audio_rsound,
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#elif AUDIO_DRIVER == AUDIO_OSS
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.audio = &audio_oss,
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#elif AUDIO_DRIVER == AUDIO_ALSA
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.audio = &audio_alsa,
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#else
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#error "Define a valid audio driver in config.h"
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#endif
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};
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static void init_drivers(void);
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static void uninit_drivers(void);
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static void init_video_input(void);
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static void uninit_video_input(void);
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static void init_audio(void);
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static void uninit_audio(void);
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static void load_state(const char* path, uint8_t* data, size_t size);
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static void write_file(const char* path, uint8_t* data, size_t size);
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static void load_save_file(const char* path, int type);
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static void save_file(const char* path, int type);
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static void init_drivers(void)
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{
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init_video_input();
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init_audio();
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}
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static void uninit_drivers(void)
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{
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uninit_video_input();
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uninit_audio();
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}
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static void init_audio(void)
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{
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driver.audio_data = driver.audio->init(audio_device, out_rate, out_latency);
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if ( driver.audio_data == NULL )
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audio_active = false;
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int err;
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source = src_new(SAMPLERATE_QUALITY, 2, &err);
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}
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static void uninit_audio(void)
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{
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if ( driver.audio_data && driver.audio )
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driver.audio->free(driver.audio_data);
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if ( source )
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src_delete(source);
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}
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static void init_video_input(void)
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{
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int scale;
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#if VIDEO_FILTER == FILTER_NONE
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scale = 1;
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#elif VIDEO_FILTER == FILTER_HQ2X
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scale = 2;
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#elif VIDEO_FILTER == FILTER_HQ4X
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scale = 4;
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#else
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scale = 1;
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#endif
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video_info_t video = {
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.width = (fullscreen) ? fullscreen_x : (296 * xscale),
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.height = (fullscreen) ? fullscreen_y : (224 * yscale),
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.fullscreen = fullscreen,
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.vsync = vsync,
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.force_aspect = force_aspect,
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.smooth = video_smooth,
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.input_scale = scale,
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};
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driver.video_data = driver.video->init(&video, &(driver.input));
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if ( driver.video_data == NULL )
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{
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exit(1);
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}
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if ( driver.input != NULL )
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{
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driver.input_data = driver.video_data;
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}
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else
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{
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driver.input_data = driver.input->init();
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if ( driver.input_data == NULL )
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exit(1);
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}
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}
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static void uninit_video_input(void)
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{
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if ( driver.video_data && driver.video )
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driver.video->free(driver.video_data);
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if ( driver.input_data != driver.video_data && driver.input )
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driver.input->free(driver.input_data);
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}
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static inline void process_frame (uint16_t * restrict out, const uint16_t * restrict in, unsigned width, unsigned height)
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{
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for ( int y = 0; y < height; y++ )
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{
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const uint16_t *src = in + y * 1024;
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uint16_t *dst = out + y * width;
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memcpy(dst, src, width * sizeof(uint16_t));
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}
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}
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// libsnes: 0.065
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// Format received is 16-bit 0RRRRRGGGGGBBBBB
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static void video_frame(const uint16_t *data, unsigned width, unsigned height)
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{
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if ( !video_active )
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return;
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#if VIDEO_FILTER == FILTER_HQ2X
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uint16_t outputHQ2x[width * height * 2 * 2];
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#elif VIDEO_FILTER == FILTER_HQ4X
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uint16_t outputHQ4x[width * height * 4 * 4];
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#endif
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uint16_t output[width * height];
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process_frame(output, data, width, height);
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#if VIDEO_FILTER == FILTER_NONE
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if ( !driver.video->frame(driver.video_data, output, width, height) )
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video_active = false;
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#elif VIDEO_FILTER == FILTER_HQ2X
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ProcessHQ2x(output, outputHQ2x);
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if ( !driver.video->frame(driver.video_data, outputHQ2x, width * 2, height * 2) )
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video_active = false;
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#elif VIDEO_FILTER == FILTER_HQ4X
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ProcessHQ4x(output, outputHQ4x);
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if ( !driver.video->frame(driver.video_data, outputHQ4x, width * 4, height * 4) )
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video_active = false;
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#else
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if ( !driver.video->frame(driver.video_data, output, width, height) )
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video_active = false;
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#endif
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}
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#define SRC_SAMPLES 64
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static void audio_sample(uint16_t left, uint16_t right)
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{
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if ( !audio_active )
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return;
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static float data[SRC_SAMPLES];
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static int data_ptr = 0;
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data[data_ptr++] = (float)(*(int16_t*)&left)/0x7FFF;
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data[data_ptr++] = (float)(*(int16_t*)&right)/0x7FFF;
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if ( data_ptr == SRC_SAMPLES )
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{
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float outsamples[SRC_SAMPLES * 16];
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int16_t temp_outsamples[SRC_SAMPLES * 16];
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SRC_DATA src_data;
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src_data.data_in = data;
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src_data.data_out = outsamples;
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src_data.input_frames = SRC_SAMPLES / 2;
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src_data.output_frames = SRC_SAMPLES * 8;
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src_data.end_of_input = 0;
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src_data.src_ratio = (double)out_rate / (double)in_rate;
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src_process(source, &src_data);
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src_float_to_short_array(outsamples, temp_outsamples, src_data.output_frames_gen * 2);
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if ( driver.audio->write(driver.audio_data, temp_outsamples, src_data.output_frames_gen * 4) < 0 )
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audio_active = false;
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data_ptr = 0;
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}
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}
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static void input_poll(void)
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{
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driver.input->poll(driver.input_data);
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}
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static int16_t input_state(bool port, unsigned device, unsigned index, unsigned id)
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{
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return driver.input->input_state(driver.input_data, snes_keybinds, port, device, index, id);
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}
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int main(int argc, char *argv[])
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{
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if ( argc != 2 )
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{
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fprintf(stderr, "Usage: %s file\n", argv[0]);
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exit(1);
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}
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fprintf(stderr, "SSNES: Opening file: \"%s\"\n", argv[1]);
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FILE *file = fopen(argv[1], "rb");
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if ( file == NULL )
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{
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fprintf(stderr, "SSNES [ERROR]: Could not open file: \"%s\"\n", argv[1]);
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exit(1);
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}
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const char *statefile_tok = NULL;
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char statefile_name[strlen(argv[1])+strlen("state")+1];
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char savefile_name_rtc[strlen(argv[1])+strlen("rtc")+1];
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char savefile_name_srm[strlen(argv[1])+strlen("srm")+1];
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statefile_tok = strtok(argv[1], ".");
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strcpy(statefile_name, statefile_tok);
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strcat(statefile_name, ".state");
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strcpy(savefile_name_rtc, statefile_tok);
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strcat(savefile_name_rtc, ".rtc");
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strcpy(savefile_name_srm, statefile_tok);
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strcat(savefile_name_srm, ".srm");
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init_drivers();
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snes_init();
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snes_set_video_refresh(video_frame);
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snes_set_audio_sample(audio_sample);
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snes_set_input_poll(input_poll);
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snes_set_input_state(input_state);
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fseek(file, 0, SEEK_END);
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long length = ftell(file);
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rewind(file);
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if ((length & 0x7fff) == 512)
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{
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length -= 512;
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fseek(file, 512, SEEK_SET);
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}
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void *rom_buf = malloc(length);
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if ( rom_buf == NULL )
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{
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fprintf(stderr, "SSNES [ERROR] :: Couldn't allocate memory!\n");
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goto error;
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}
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if ( fread(rom_buf, 1, length, file) < length )
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{
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fprintf(stderr, "SSNES [ERROR] :: Didn't read whole file.\n");
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goto error;
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}
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fclose(file);
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snes_load_cartridge_normal(NULL, rom_buf, length);
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free(rom_buf);
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unsigned serial_size = snes_serialize_size();
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uint8_t *serial_data = malloc(serial_size);
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if ( serial_size > (unsigned)length )
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{
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fprintf(stderr, "SSNES [ERROR] :: Length of save file does match size given by libsnes.\n");
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fprintf(stderr, "\tserial_size = %u, length = %u\n", serial_size, (unsigned)length);
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goto error;
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}
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load_save_file(savefile_name_srm, SNES_MEMORY_CARTRIDGE_RAM);
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load_save_file(savefile_name_rtc, SNES_MEMORY_CARTRIDGE_RTC);
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///// TODO: Modular friendly!!!
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for(;;)
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{
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int quitting = glfwGetKey(GLFW_KEY_ESC) || !glfwGetWindowParam(GLFW_OPENED);
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if ( quitting )
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break;
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if ( glfwGetKey( SAVE_STATE_KEY ))
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{
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write_file(statefile_name, serial_data, serial_size);
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}
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else if ( glfwGetKey( LOAD_STATE_KEY ) )
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load_state(statefile_name, serial_data, serial_size);
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else if ( glfwGetKey( TOGGLE_FULLSCREEN ) )
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{
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fullscreen = !fullscreen;
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uninit_drivers();
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init_drivers();
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}
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snes_run();
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}
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save_file(savefile_name_srm, SNES_MEMORY_CARTRIDGE_RAM);
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save_file(savefile_name_rtc, SNES_MEMORY_CARTRIDGE_RTC);
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snes_unload_cartridge();
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snes_term();
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uninit_drivers();
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return 0;
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error:
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snes_unload_cartridge();
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snes_term();
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uninit_drivers();
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return 1;
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}
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static void write_file(const char* path, uint8_t* data, size_t size)
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{
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FILE *file = fopen(path, "wb");
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if ( file != NULL )
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{
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fprintf(stderr, "SSNES: Saving state \"%s\". Size: %d bytes.\n", path, (int)size);
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snes_serialize(data, size);
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if ( fwrite(data, 1, size, file) != size )
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fprintf(stderr, "SSNES [WARN]: Did not save state properly.");
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fclose(file);
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}
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}
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static void load_state(const char* path, uint8_t* data, size_t size)
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{
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fprintf(stderr, "SSNES: Loading state: \"%s\".\n", path);
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FILE *file = fopen(path, "rb");
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if ( file != NULL )
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{
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//fprintf(stderr, "SSNES: Loading state. Size: %d bytes.\n", (int)size);
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if ( fread(data, 1, size, file) != size )
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fprintf(stderr, "SSNES [WARN]: Did not load state properly.");
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fclose(file);
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snes_unserialize(data, size);
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}
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else
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{
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fprintf(stderr, "SSNES: No state file found. Will create new.\n");
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}
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}
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static void load_save_file(const char* path, int type)
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{
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FILE *file;
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file = fopen(path, "rb");
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if ( !file )
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{
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return;
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}
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size_t size = snes_get_memory_size(type);
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uint8_t *data = snes_get_memory_data(type);
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if (size == 0 || !data)
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{
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fclose(file);
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return;
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}
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int rc = fread(data, 1, size, file);
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if ( rc != size )
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{
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fprintf(stderr, "SSNES [ERROR]: Couldn't load save file.\n");
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}
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fprintf(stderr, "SSNES: Loaded save file: \"%s\"\n", path);
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fclose(file);
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}
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static void save_file(const char* path, int type)
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{
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size_t size = snes_get_memory_size(type);
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uint8_t *data = snes_get_memory_data(type);
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if ( data && size > 0 )
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write_file(path, data, size);
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}
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