frontend: initial libretro support

..and some refactoring

1 files changed, 345 insertions, 0 deletions

diff --git a/frontend/libretro.c b/frontend/libretro.c
new file mode 100644
index 0000000..29276bd
--- /dev/null
+++ b/frontend/libretro.c
@@ -0,0 +1,345 @@
+/*
+ * (C) notaz, 2012
+ *
+ * This work is licensed under the terms of the GNU GPLv2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../libpcsxcore/misc.h"
+#include "../libpcsxcore/psxcounters.h"
+#include "../libpcsxcore/new_dynarec/new_dynarec.h"
+#include "main.h"
+#include "plugin.h"
+#include "plugin_lib.h"
+#include "revision.h"
+#include "libretro.h"
+
+static retro_video_refresh_t video_cb;
+static retro_input_poll_t input_poll_cb;
+static retro_input_state_t input_state_cb;
+static retro_environment_t environ_cb;
+static retro_audio_sample_batch_t audio_batch_cb;
+
+static void *vout_buf;
+static int vout_width, vout_height;
+static int samples_sent, samples_to_send;
+static int plugins_opened;
+
+/* PCSX ReARMed core calls and stuff */
+int in_type1, in_type2;
+int in_a1[2] = { 127, 127 }, in_a2[2] = { 127, 127 };
+int in_keystate;
+int in_enable_vibration;
+
+static int vout_open(void)
+{
+	return 0;
+}
+
+static void *vout_set_mode(int w, int h, int bpp)
+{
+	vout_width = w;
+	vout_height = h;
+	return vout_buf;
+}
+
+/* FIXME: either teach PCSX to blit to RGB1555 or RetroArch to support RGB565 */
+static void convert(void *buf, size_t size)
+{
+	unsigned int i, v, *p = buf;
+
+	for (i = 0; i < size / 2; i++) {
+		v = p[i];
+		p[i] = (v & 0x001f001f) | ((v >> 1) & 0x7fe07fe0);
+	}
+}
+
+static void *vout_flip(void)
+{
+	pl_rearmed_cbs.flip_cnt++;
+	convert(vout_buf,  vout_width * vout_height * 2);
+	video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
+
+	return vout_buf;
+}
+
+static void vout_close(void)
+{
+}
+
+struct rearmed_cbs pl_rearmed_cbs = {
+	.pl_vout_open = vout_open,
+	.pl_vout_set_mode = vout_set_mode,
+	.pl_vout_flip = vout_flip,
+	.pl_vout_close = vout_close,
+	/* from psxcounters */
+	.gpu_hcnt = &hSyncCount,
+	.gpu_frame_count = &frame_counter,
+};
+
+void pl_frame_limit(void)
+{
+	/* called once per frame, make psxCpu->Execute() above return */
+	stop = 1;
+}
+
+void pl_timing_prepare(int is_pal)
+{
+}
+
+void plat_trigger_vibrate(int is_strong)
+{
+}
+
+void pl_update_gun(int *xn, int *xres, int *y, int *in)
+{
+}
+
+/* sound calls */
+void SetupSound(void)
+{
+}
+
+void RemoveSound(void)
+{
+}
+
+unsigned long SoundGetBytesBuffered(void)
+{
+	if (samples_to_send > samples_sent)
+		return 0; /* give more samples */
+	else
+		return 1;
+}
+
+void SoundFeedStreamData(void *buf, long bytes)
+{
+	audio_batch_cb(buf, bytes / 4);
+	samples_sent += bytes / 4;
+}
+
+/* libretro */
+void retro_set_environment(retro_environment_t cb) { environ_cb = cb; }
+void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
+void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
+void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
+void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
+void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
+
+unsigned retro_api_version(void)
+{
+	return RETRO_API_VERSION;
+}
+
+void retro_set_controller_port_device(unsigned port, unsigned device)
+{
+}
+
+void retro_get_system_info(struct retro_system_info *info)
+{
+	memset(info, 0, sizeof(*info));
+	info->library_name = "PCSX-ReARMed";
+	info->library_version = REV;
+	info->valid_extensions = "bin|cue|img|mdf|pbp|cbn";
+	info->need_fullpath = true;
+}
+
+void retro_get_system_av_info(struct retro_system_av_info *info)
+{
+	memset(info, 0, sizeof(*info));
+	info->timing.fps            = 60;
+	info->timing.sample_rate    = 44100;
+	info->geometry.base_width   = 320;
+	info->geometry.base_height  = 240;
+	info->geometry.max_width    = 640;
+	info->geometry.max_height   = 512;
+	info->geometry.aspect_ratio = 4.0 / 3.0;
+}
+
+/* TODO */
+size_t retro_serialize_size(void) 
+{ 
+	return 0;
+}
+
+bool retro_serialize(void *data, size_t size)
+{ 
+	return false;
+}
+
+bool retro_unserialize(const void *data, size_t size)
+{
+	return false;
+}
+
+void retro_cheat_reset(void)
+{
+}
+
+void retro_cheat_set(unsigned index, bool enabled, const char *code)
+{
+}
+
+bool retro_load_game(const struct retro_game_info *info)
+{
+	if (plugins_opened) {
+		ClosePlugins();
+		plugins_opened = 0;
+	}
+
+	set_cd_image(info->path);
+
+	/* have to reload after set_cd_image for correct cdr plugin */
+	if (LoadPlugins() == -1) {
+		printf("faled to load plugins\n");
+		return false;
+	}
+
+	plugins_opened = 1;
+	NetOpened = 0;
+
+	if (OpenPlugins() == -1) {
+		printf("faled to open plugins\n");
+		return false;
+	}
+
+	plugin_call_rearmed_cbs();
+
+	Config.PsxAuto = 1;
+	if (CheckCdrom() == -1) {
+		printf("unsupported/invalid CD image: %s\n", info->path);
+		return false;
+	}
+
+	SysReset();
+
+	if (LoadCdrom() == -1) {
+		printf("could not load CD-ROM!\n");
+		return false;
+	}
+	emu_on_new_cd();
+
+	return true;
+}
+
+bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
+{
+	return false;
+}
+
+void retro_unload_game(void) 
+{
+}
+
+unsigned retro_get_region(void)
+{
+	return RETRO_REGION_NTSC;
+}
+
+void *retro_get_memory_data(unsigned id)
+{
+	return NULL;
+}
+
+size_t retro_get_memory_size(unsigned id)
+{
+	return 0;
+}
+
+void retro_reset(void)
+{
+	SysReset();
+}
+
+static const unsigned short retro_psx_map[] = {
+	[RETRO_DEVICE_ID_JOYPAD_B]	= 1 << DKEY_CROSS,
+	[RETRO_DEVICE_ID_JOYPAD_Y]	= 1 << DKEY_SQUARE,
+	[RETRO_DEVICE_ID_JOYPAD_SELECT]	= 1 << DKEY_SELECT,
+	[RETRO_DEVICE_ID_JOYPAD_START]	= 1 << DKEY_START,
+	[RETRO_DEVICE_ID_JOYPAD_UP]	= 1 << DKEY_UP,
+	[RETRO_DEVICE_ID_JOYPAD_DOWN]	= 1 << DKEY_DOWN,
+	[RETRO_DEVICE_ID_JOYPAD_LEFT]	= 1 << DKEY_LEFT,
+	[RETRO_DEVICE_ID_JOYPAD_RIGHT]	= 1 << DKEY_RIGHT,
+	[RETRO_DEVICE_ID_JOYPAD_A]	= 1 << DKEY_CIRCLE,
+	[RETRO_DEVICE_ID_JOYPAD_X]	= 1 << DKEY_TRIANGLE,
+	[RETRO_DEVICE_ID_JOYPAD_L]	= 1 << DKEY_L1,
+	[RETRO_DEVICE_ID_JOYPAD_R]	= 1 << DKEY_R1,
+	[RETRO_DEVICE_ID_JOYPAD_L2]	= 1 << DKEY_L2,
+	[RETRO_DEVICE_ID_JOYPAD_R2]	= 1 << DKEY_R2,
+	[RETRO_DEVICE_ID_JOYPAD_L3]	= 1 << DKEY_L3,
+	[RETRO_DEVICE_ID_JOYPAD_R3]	= 1 << DKEY_R3,
+};
+#define RETRO_PSX_MAP_LEN (sizeof(retro_psx_map) / sizeof(retro_psx_map[0]))
+
+void retro_run(void) 
+{
+	int i;
+
+	input_poll_cb();
+	in_keystate = 0;
+	for (i = 0; i < RETRO_PSX_MAP_LEN; i++)
+		if (input_state_cb(1, RETRO_DEVICE_JOYPAD, 0, i))
+			in_keystate |= retro_psx_map[i];
+	in_keystate <<= 16;
+	for (i = 0; i < RETRO_PSX_MAP_LEN; i++)
+		if (input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, i))
+			in_keystate |= retro_psx_map[i];
+
+	stop = 0;
+	psxCpu->Execute();
+
+	samples_to_send += 44100 / 60;
+}
+
+void retro_init(void)
+{
+	const char *bios[] = { "scph1001", "scph5501", "scph7001" };
+	const char *dir;
+	char path[256];
+	FILE *f = NULL;
+	int i, ret, level;
+
+	ret = emu_core_preinit();
+	ret |= emu_core_init();
+	if (ret != 0) {
+		printf("PCSX init failed, sorry\n");
+		exit(1);
+	}
+
+	vout_buf = malloc(640 * 512 * 2);
+
+	if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir)
+	{
+		snprintf(Config.BiosDir, sizeof(Config.BiosDir), "%s/", dir);
+
+		for (i = 0; i < sizeof(bios) / sizeof(bios[0]); i++) {
+			snprintf(path, sizeof(path), "%s/%s.bin", dir, bios[i]);
+			f = fopen(path, "r");
+			if (f != NULL) {
+				snprintf(Config.Bios, sizeof(Config.Bios), "%s.bin", bios[i]);
+				break;
+			}
+		}
+	}
+	if (f != NULL) {
+		printf("found BIOS file: %s\n", Config.Bios);
+		fclose(f);
+	}
+	else
+		printf("no BIOS files found.\n");
+
+	level = 1;
+	environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
+}
+
+void retro_deinit(void)
+{
+	SysClose();
+	free(vout_buf);
+	vout_buf = NULL;
+}
+