SoCに組み込まれているため、`/cpu`にある方が正確ではある

1 frame = 4 bytes (stereo 16bit)

a.k.a. Boot ROM

DMG-CPU, CGB-CPU

VRAM DMA (CGB only)

OAM DMA

音の三要素 のうち、 音の大きさ (振幅)

ExitCode represents program's status code

ExitCode represents program's status code

P1/JOYP (0xFF00)

フレームの間に起きたLCDSTAT IRQに関する情報(フレームの始まりにリセットされる)

* SoCに組み込まれているため、`/cpu`にある方が正確ではある また、コードをシンプルにしたいのでスキャンライン単位で描画を行うことにしている(スキャンライン中にSCX,SCYやWX, WYを変更するようなゲームでは正しく描画されない場合がある) */

GB/GBA の PSG (Programmable Sound Generator) ユニット

ZNHC----

Needed ?

0b0_BBBBB_GGGGG_RRRRR

便宜的にPPU構造体に入れているが、PPUチップ内にはなくボード上にある

波形は最大15なので4左シフトすれば0% 波形メモリ音源

* A callback to register with the frontend to receive audio buffer occupancy information. */

* An interface that the frontend uses to request audio samples from the core. * @note To unregister a callback, pass a \c retro_audio_callback_t * w

* Flags that define A/V steps that the core may skip for this frame. * * @see RETRO_ENVIRONMENT_GET_AUDIO_VIDEO_ENABLE */

* Denotes the type of buffer in which the camera will store its input. * * Different camera drivers may support different buffer types. * * @see R

* An interface that the core can use to access a device's camera. * * @see RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE */

* Details about a controller (or controller configuration) * supported by one of a core's emulated input ports. * * @see RETRO_ENVIRONMENT_SET_CONT

* Lists the types of controllers supported by * one of core's emulated input ports. * * @see RETRO_ENVIRONMENT_SET_CONTROLLER_INFO */

* @copybrief retro_core_option_v2_definition * * @deprecated Use \ref retro_core_option_v2_definition instead, * as it supports categorizing option

* An argument that's used to show or hide a core option in the frontend. * * @see RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY */

* A descriptor for a group of related core options. * * Here's an example category: * * @code * { * "cpu", * "CPU Emulation", * "S

* A descriptor for a particular core option and the values it may take. * * Supports categorizing options into groups, * so as not to overwhelm the

* A descriptor for a particular choice within a core option. * * @note All option values are represented as strings. * If you need to represent any

* A variant of \ref retro_core_options that supports internationalization. * * @deprecated Use \ref retro_core_options_v2_intl instead, * as it sup

* Callback registered by the core for the frontend to use * when setting the visibility of each core option. * * @see RETRO_ENVIRONMENT_SET_CORE_OP

* A set of core option descriptors and the categories that group them, * suitable for enabling a core to be customized. * * @see RETRO_ENVIRONMENT_