Adds simple disc control for games that require it

1 files changed, 52 insertions, 0 deletions

diff --git a/core.c b/core.c
index c4c9e13..6aaf05f 100644
--- a/core.c
+++ b/core.c
@@ -28,6 +28,7 @@ static char save_dir[MAX_PATH];
 static char system_dir[MAX_PATH];
 static char temp_rom[MAX_PATH];
 static struct retro_game_info game_info;
+static struct retro_disk_control_ext_callback disk_control_ext;
 
 static uint32_t buttons = 0;
 
@@ -217,6 +218,32 @@ error:
 	return ret;
 }
 
+unsigned disc_get_count(void) {
+	if (disk_control_ext.get_num_images)
+		return disk_control_ext.get_num_images();
+
+	return 0;
+}
+
+unsigned disc_get_index(void) {
+	if (disk_control_ext.get_image_index)
+		return disk_control_ext.get_image_index();
+
+	return 0;
+}
+
+bool disc_switch_index(unsigned index) {
+	bool ret = false;
+	if (!disk_control_ext.set_eject_state || !disk_control_ext.set_image_index)
+		return false;
+
+	disk_control_ext.set_eject_state(true);
+	ret = disk_control_ext.set_image_index(index);
+	disk_control_ext.set_eject_state(false);
+
+	return ret;
+}
+
 static void set_directories(void) {
 	const char *home = getenv("HOME");
 	char cwd[MAX_PATH];
@@ -277,6 +304,16 @@ static bool pa_environment(unsigned cmd, void *data) {
 		}
 		break;
 	}
+	case RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE: { /* 13 */
+		const struct retro_disk_control_callback *var =
+			(const struct retro_disk_control_callback *)data;
+
+		if (var) {
+			memset(&disk_control_ext, 0, sizeof(struct retro_disk_control_ext_callback));
+			memcpy(&disk_control_ext, var, sizeof(struct retro_disk_control_callback));
+		}
+		break;
+	}
 	case RETRO_ENVIRONMENT_GET_VARIABLE: { /* 15 */
 		struct retro_variable *var = (struct retro_variable *)data;
 		if (var && var->key) {
@@ -348,6 +385,21 @@ static bool pa_environment(unsigned cmd, void *data) {
 			options_set_visible(display->key, display->visible);
 		break;
 	}
+	case RETRO_ENVIRONMENT_GET_DISK_CONTROL_INTERFACE_VERSION: { /* 57 */
+		unsigned *out =	(unsigned *)data;
+		if (out)
+			*out = 1;
+		break;
+	}
+	case RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE: { /* 58 */
+		const struct retro_disk_control_ext_callback *var =
+			(const struct retro_disk_control_ext_callback *)data;
+
+		if (var) {
+			memcpy(&disk_control_ext, var, sizeof(struct retro_disk_control_ext_callback));
+		}
+		break;
+	}
 	case RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK: { /* 62 */
 		const struct retro_audio_buffer_status_callback *cb =
 			(const struct retro_audio_buffer_status_callback *)data;