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This commit is contained in:
fincs 2015-10-06 11:47:28 +02:00
parent d9c133d28a
commit 56a2712501
4 changed files with 115 additions and 82 deletions
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52
libctru/include/3ds/gpu/enums.h
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@ -19,8 +19,8 @@
/// Texture filters.
typedef enum
{
GPU_NEAREST = 0x0, ///< Nearest.
GPU_LINEAR = 0x1, ///< Linear.
GPU_NEAREST = 0x0, ///< Nearest-neighbor interpolation.
GPU_LINEAR = 0x1, ///< Linear interpolation.
} GPU_TEXTURE_FILTER_PARAM;
/// Texture wrap modes.
@ -255,13 +255,13 @@ typedef enum
/// Creates a light environment layer configuration parameter.
#define GPU_LIGHT_ENV_LAYER_CONFIG(n) ((n)+((n)==7))
/// Creates a LC1 shadow bit parameter.
/// Light shadow disable bits in GPUREG_LIGHT_CONFIG1.
#define GPU_LC1_SHADOWBIT(n) BIT(n)
/// Creates a LC1 spot bit parameter.
/// Light spot disable bits in GPUREG_LIGHT_CONFIG1.
#define GPU_LC1_SPOTBIT(n) BIT((n)+8)
/// Creates a LC1 LUT bit parameter.
/// LUT disable bits in GPUREG_LIGHT_CONFIG1.
#define GPU_LC1_LUTBIT(n) BIT((n)+16)
/// Creates a LC1 attenuation bit parameter.
/// Light distance attenuation disable bits in GPUREG_LIGHT_CONFIG1.
#define GPU_LC1_ATTNBIT(n) BIT((n)+24)
/// Creates a light permutation parameter.
#define GPU_LIGHTPERM(i,n) ((n) << (i))
@ -272,7 +272,7 @@ typedef enum
/// Creates a light color parameter from red, green, and blue components.
#define GPU_LIGHTCOLOR(r,g,b) (((b) & 0xFF) | (((g) << 10) & 0xFF) | (((r) << 20) & 0xFF))
/// FRESNEL options.
/// Fresnel options.
typedef enum
{
GPU_NO_FRESNEL = 0, ///< None.
@ -285,32 +285,32 @@ typedef enum
typedef enum
{
GPU_BUMP_NOT_USED = 0, ///< Disabled.
GPU_BUMP_AS_BUMP = 1, ///< Bump as bump.
GPU_BUMP_AS_TANG = 2, ///< Bump as tang.
GPU_BUMP_AS_BUMP = 1, ///< Bump as bump mapping.
GPU_BUMP_AS_TANG = 2, ///< Bump as tangent/normal mapping.
} GPU_BUMPMODE;
/// LUT IDs.
typedef enum
{
GPU_LUT_D0 = 0, ///< LUT D0.
GPU_LUT_D1 = 1, ///< LUT D1.
GPU_LUT_SP = 2, ///< LUT SP.
GPU_LUT_FR = 3, ///< LUT FR.
GPU_LUT_RB = 4, ///< LUT RB.
GPU_LUT_RG = 5, ///< LUT RG.
GPU_LUT_RR = 6, ///< LUT RR.
GPU_LUT_DA = 7, ///< LUT DA.
GPU_LUT_D0 = 0, ///< D0 LUT.
GPU_LUT_D1 = 1, ///< D1 LUT.
GPU_LUT_SP = 2, ///< Spotlight LUT.
GPU_LUT_FR = 3, ///< Fresnel LUT.
GPU_LUT_RB = 4, ///< Reflection-Blue LUT.
GPU_LUT_RG = 5, ///< Reflection-Green LUT.
GPU_LUT_RR = 6, ///< Reflection-Red LUT.
GPU_LUT_DA = 7, ///< Distance attenuation LUT.
} GPU_LIGHTLUTID;
/// LUT inputs.
typedef enum
{
GPU_LUTINPUT_NH = 0, ///< Input NH.
GPU_LUTINPUT_VH = 1, ///< Input VH.
GPU_LUTINPUT_NV = 2, ///< Input NV.
GPU_LUTINPUT_LN = 3, ///< Input LN.
GPU_LUTINPUT_SP = 4, ///< Input SP.
GPU_LUTINPUT_CP = 5, ///< Input CP.
GPU_LUTINPUT_NH = 0, ///< Normal*HalfVector
GPU_LUTINPUT_VH = 1, ///< View*HalfVector
GPU_LUTINPUT_NV = 2, ///< Normal*View
GPU_LUTINPUT_LN = 3, ///< LightVector*Normal
GPU_LUTINPUT_SP = 4, ///< -LightVector*SpotlightVector
GPU_LUTINPUT_CP = 5, ///< cosine of phi
} GPU_LIGHTLUTINPUT;
/// LUT scalers.
@ -327,9 +327,9 @@ typedef enum
/// LUT selection.
typedef enum
{
GPU_LUTSELECT_COMMON = 0, ///< Common.
GPU_LUTSELECT_SP = 1, ///< SP.
GPU_LUTSELECT_DA = 2, ///< DA.
GPU_LUTSELECT_COMMON = 0, ///< LUTs that are common to all lights.
GPU_LUTSELECT_SP = 1, ///< Spotlight LUT.
GPU_LUTSELECT_DA = 2, ///< Distance attenuation LUT.
} GPU_LIGHTLUTSELECT;
/// Supported primitives.

30
libctru/include/3ds/gpu/gpu-old.h
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@ -1,6 +1,7 @@
/**
* @file gpu-old.h
* @brief Deprecated GPU functions.
* @brief Deprecated GPU functions which should not be used in new code.
* @description These functions have been superseeded by direct GPU register writes, or external GPU libraries.
* @deprecated
*/
#pragma once
@ -10,6 +11,7 @@
/**
* @brief Initializes the GPU.
* @param gsphandle GSP handle to use.
* @deprecated
*/
void GPU_Init(Handle *gsphandle) DEPRECATED;
@ -18,6 +20,7 @@ void GPU_Init(Handle *gsphandle) DEPRECATED;
* @param gxbuf GX command buffer to use.
* @param gpuBuf GPU command buffer to use.
* @param gpuBufSize GPU command buffer size.
* @deprecated
*/
void GPU_Reset(u32* gxbuf, u32* gpuBuf, u32 gpuBufSize) DEPRECATED;
@ -27,6 +30,7 @@ void GPU_Reset(u32* gxbuf, u32* gpuBuf, u32 gpuBufSize) DEPRECATED;
* @param startreg Start of the uniform register to set.
* @param data Data to set.
* @param numreg Number of registers to set.
* @deprecated
*/
void GPU_SetFloatUniform(GPU_SHADER_TYPE type, u32 startreg, u32* data, u32 numreg) DEPRECATED;
@ -38,6 +42,7 @@ void GPU_SetFloatUniform(GPU_SHADER_TYPE type, u32 startreg, u32* data, u32 numr
* @param y Y of the viewport.
* @param w Width of the viewport.
* @param h Height of the viewport.
* @deprecated
*/
void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u32 h) DEPRECATED;
@ -48,6 +53,7 @@ void GPU_SetViewport(u32* depthBuffer, u32* colorBuffer, u32 x, u32 y, u32 w, u3
* @param y Y of the scissor region.
* @param w Width of the scissor region.
* @param h Height of the scissor region.
* @deprecated
*/
void GPU_SetScissorTest(GPU_SCISSORMODE mode, u32 x, u32 y, u32 w, u32 h) DEPRECATED;
@ -55,6 +61,7 @@ void GPU_SetScissorTest(GPU_SCISSORMODE mode, u32 x, u32 y, u32 w, u32 h) DEPREC
* @brief Sets the depth map.
* @param zScale Z scale to use.
* @param zOffset Z offset to use.
* @deprecated
*/
void GPU_DepthMap(float zScale, float zOffset) DEPRECATED;
@ -63,6 +70,7 @@ void GPU_DepthMap(float zScale, float zOffset) DEPRECATED;
* @param enable Whether to enable alpha testing.
* @param function Test function to use.
* @param ref Reference value to use.
* @deprecated
*/
void GPU_SetAlphaTest(bool enable, GPU_TESTFUNC function, u8 ref) DEPRECATED;
@ -72,6 +80,7 @@ void GPU_SetAlphaTest(bool enable, GPU_TESTFUNC function, u8 ref) DEPRECATED;
* @param enable Whether to enable depth testing.
* @param function Test function to use.
* @param writemask Pixel write mask to use.
* @deprecated
*/
void GPU_SetDepthTestAndWriteMask(bool enable, GPU_TESTFUNC function, GPU_WRITEMASK writemask) DEPRECATED;
@ -82,6 +91,7 @@ void GPU_SetDepthTestAndWriteMask(bool enable, GPU_TESTFUNC function, GPU_WRITEM
* @param ref Reference value to use.
* @param input_mask Input mask to use.
* @param write_mask Write mask to use.
* @deprecated
*/
void GPU_SetStencilTest(bool enable, GPU_TESTFUNC function, u8 ref, u8 input_mask, u8 write_mask) DEPRECATED;
@ -90,12 +100,14 @@ void GPU_SetStencilTest(bool enable, GPU_TESTFUNC function, u8 ref, u8 input_mas
* @param sfail Operator to use on source test failure.
* @param dfail Operator to use on destination test failure.
* @param pass Operator to use on test passing.
* @deprecated
*/
void GPU_SetStencilOp(GPU_STENCILOP sfail, GPU_STENCILOP dfail, GPU_STENCILOP pass) DEPRECATED;
/**
* @brief Sets the face culling mode.
* @param mode Face culling mode to use.
* @deprecated
*/
void GPU_SetFaceCulling(GPU_CULLMODE mode) DEPRECATED;
@ -105,6 +117,7 @@ void GPU_SetFaceCulling(GPU_CULLMODE mode) DEPRECATED;
* @note Only the first four TEV stages can write to the combiner buffer.
* @param rgb_config RGB configuration to use.
* @param alpha_config Alpha configuration to use.
* @deprecated
*/
void GPU_SetCombinerBufferWrite(u8 rgb_config, u8 alpha_config) DEPRECATED;
@ -117,6 +130,7 @@ void GPU_SetCombinerBufferWrite(u8 rgb_config, u8 alpha_config) DEPRECATED;
* @param colorDst Destination factor of color components.
* @param alphaSrc Source factor of the alpha component.
* @param alphaDst Destination factor of the alpha component.
* @deprecated
*/
void GPU_SetAlphaBlending(GPU_BLENDEQUATION colorEquation, GPU_BLENDEQUATION alphaEquation,
GPU_BLENDFACTOR colorSrc, GPU_BLENDFACTOR colorDst,
@ -126,6 +140,7 @@ void GPU_SetAlphaBlending(GPU_BLENDEQUATION colorEquation, GPU_BLENDEQUATION alp
* @brief Sets the color logic operator.
* @note Cannot be used with GPU_SetAlphaBlending.
* @param op Operator to set.
* @deprecated
*/
void GPU_SetColorLogicOp(GPU_LOGICOP op) DEPRECATED;
@ -135,6 +150,7 @@ void GPU_SetColorLogicOp(GPU_LOGICOP op) DEPRECATED;
* @param g Green component.
* @param b Blue component.
* @param a Alpha component.
* @deprecated
*/
void GPU_SetBlendingColor(u8 r, u8 g, u8 b, u8 a) DEPRECATED;
@ -149,12 +165,14 @@ void GPU_SetBlendingColor(u8 r, u8 g, u8 b, u8 a) DEPRECATED;
* @param bufferOffsets Offsets of the buffers.
* @param bufferPermutations Buffer permutations.
* @param bufferNumAttributes Numbers of attributes of the buffers.
* @deprecated
*/
void GPU_SetAttributeBuffers(u8 totalAttributes, u32* baseAddress, u64 attributeFormats, u16 attributeMask, u64 attributePermutation, u8 numBuffers, u32 bufferOffsets[], u64 bufferPermutations[], u8 bufferNumAttributes[]) DEPRECATED;
/**
* @brief Sets the enabled texture units.
* @param units Units to enable. OR texture unit values together to create this value.
* @deprecated
*/
void GPU_SetTextureEnable(GPU_TEXUNIT units) DEPRECATED;
@ -166,6 +184,7 @@ void GPU_SetTextureEnable(GPU_TEXUNIT units) DEPRECATED;
* @param height Height of the texture.
* @param Parameters of the texture, such as filters and wrap modes.
* @param colorType Color type of the texture.
* @deprecated
*/
void GPU_SetTexture(GPU_TEXUNIT unit, u32* data, u16 width, u16 height, u32 param, GPU_TEXCOLOR colorType) DEPRECATED;
@ -173,6 +192,7 @@ void GPU_SetTexture(GPU_TEXUNIT unit, u32* data, u16 width, u16 height, u32 para
* @brief Sets the border color of a texture unit.
* @param unit Texture unit to use.
* @param borderColor The color used for the border when using the @ref GPU_CLAMP_TO_BORDER wrap mode.
* @deprecated
*/
void GPU_SetTextureBorderColor(GPU_TEXUNIT unit,u32 borderColor) DEPRECATED;
@ -186,6 +206,7 @@ void GPU_SetTextureBorderColor(GPU_TEXUNIT unit,u32 borderColor) DEPRECATED;
* @param rgbCombine RGB combiner function.
* @param alphaCombine Alpha combiner function.
* @param constantColor Constant color to provide.
* @deprecated
*/
void GPU_SetTexEnv(u8 id, u16 rgbSources, u16 alphaSources, u16 rgbOperands, u16 alphaOperands, GPU_COMBINEFUNC rgbCombine, GPU_COMBINEFUNC alphaCombine, u32 constantColor) DEPRECATED;
@ -194,6 +215,7 @@ void GPU_SetTexEnv(u8 id, u16 rgbSources, u16 alphaSources, u16 rgbOperands, u16
* @param primitive Primitive to draw.
* @param first First vertex to draw.
* @param count Number of vertices to draw.
* @deprecated
*/
void GPU_DrawArray(GPU_Primitive_t primitive, u32 first, u32 count) DEPRECATED;
@ -202,8 +224,12 @@ void GPU_DrawArray(GPU_Primitive_t primitive, u32 first, u32 count) DEPRECATED;
* @param primitive Primitive to draw.
* @param indexArray Array of vertex indices to use.
* @param n Number of vertices to draw.
* @deprecated
*/
void GPU_DrawElements(GPU_Primitive_t primitive, u32* indexArray, u32 n) DEPRECATED;
/// Finishes drawing.
/**
* @brief Finishes drawing.
* @deprecated
*/
void GPU_FinishDrawing() DEPRECATED;

75
libctru/include/3ds/ndsp/channel.h
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@ -1,12 +1,12 @@
/**
* @file channel.h
* @brief NDSP channels.
* @brief Functions for interacting with DSP audio channels.
*/
#pragma once
///@name Data types
///@{
/// Supported NDSP encodings.
/// Supported sample encodings.
enum
{
NDSP_ENCODING_PCM8 = 0, ///< PCM8
@ -14,12 +14,12 @@ enum
NDSP_ENCODING_ADPCM, ///< DSPADPCM (GameCube format)
} NDSP_Encoding;
/// Creates a hardware channel value from a channel number.
/// Specifies the number of channels used in a sample.
#define NDSP_CHANNELS(n) ((u32)(n) & 3)
/// Creates a hardware encoding value from an encoding type.
/// Specifies the encoding used in a sample.
#define NDSP_ENCODING(n) (((u32)(n) & 3) << 2)
/// NDSP playback flags.
/// Channel format flags for use with ndspChnSetFormat.
enum
{
NDSP_FORMAT_MONO_PCM8 = NDSP_CHANNELS(1) | NDSP_ENCODING(NDSP_ENCODING_PCM8), ///< Buffer contains Mono PCM8.
@ -34,7 +34,7 @@ enum
// Flags
NDSP_FRONT_BYPASS = BIT(4), ///< Front bypass.
NDSP_3D_SURROUND_PREPROCESSED = BIT(6), ///< Preprocessed 3D surround sound.
NDSP_3D_SURROUND_PREPROCESSED = BIT(6), ///< (?) Unknown, under research
} NDSP_Flags;
///@}
@ -42,34 +42,34 @@ enum
///@{
/**
* @brief Resets a channel.
* @param id ID of the channel.
* @param id ID of the channel (0..23).
*/
void ndspChnReset(int id);
/**
* @brief Initializes the parameters of a channel.
* @param id ID of the channel.
* @param id ID of the channel (0..23).
*/
void ndspChnInitParams(int id);
/**
* @brief Checks whether a channel is currently playing.
* @param id ID of the channel.
* @param id ID of the channel (0..23).
* @return Whether the channel is currently playing.
*/
bool ndspChnIsPlaying(int id);
/**
* @brief Gets the current sample position of a channel.
* @param id ID of the channel.
* @param id ID of the channel (0..23).
* @return The channel's sample position.
*/
u32 ndspChnGetSamplePos(int id);
/**
* @brief Gets the current wave buffer sequence position of a channel.
* @param id ID of the channel.
* @return The channel's wave buffer sequence position.
* @brief Gets the sequence ID of the wave buffer that is currently playing in a channel.
* @param id ID of the channel (0..23).
* @return The sequence ID of the wave buffer.
*/
u16 ndspChnGetWaveBufSeq(int id);
///@}
@ -79,36 +79,42 @@ u16 ndspChnGetWaveBufSeq(int id);
/**
* @brief Sets the format of a channel.
* @sa NDSP_Encoding
* @param id ID of the channel.
* @param id ID of the channel (0..23).
* @param format Format to use.
*/
void ndspChnSetFormat(int id, u16 format);
/**
* @brief Sets the linear interpolation type of a channel.
* @param id ID of the channel.
* @param type Linear interpolation type to use.
* @brief Sets the interpolation type of a channel.
* @param id ID of the channel (0..23).
* @param type Interpolation type to use.
*/
void ndspChnSetInterp(int id, int type);
/**
* @brief Sets the sample rate of a channel.
* @param id ID of the channel.
* @param id ID of the channel (0..23).
* @param rate Sample rate to use.
*/
void ndspChnSetRate(int id, float rate);
/**
* @brief Sets the mix parameters of a channel.
* @param id ID of the channel.
* @param mix Mix parameters to use.
* @brief Sets the mix parameters (volumes) of a channel.
* @param id ID of the channel (0..23).
* @param mix Mix parameters to use. Working hypothesis:
* - 0: Front left volume.
* - 1: Front right volume.
* - 2: Back left volume:
* - 3: Back right volume:
* - 4..7: Same as 0..3, but for auxiliary output 0.
* - 8..11: Same as 0..3, but for auxiliary output 1.
*/
void ndspChnSetMix(int id, float mix[12]);
/**
* @brief Sets the ADPCM coefficients of a channel.
* @param id ID of the channel.
* @param coefs ADPCM coefficients to use.
* @brief Sets the DSPADPCM coefficients of a channel.
* @param id ID of the channel (0..23).
* @param coefs DSPADPCM coefficients to use.
*/
void ndspChnSetAdpcmCoefs(int id, u16 coefs[16]);
///@}
@ -116,14 +122,15 @@ void ndspChnSetAdpcmCoefs(int id, u16 coefs[16]);
///@name Wave buffers
///@{
/**
* @brief Clears the wave buffers of a channel.
* @param id ID of the channel.
* @brief Clears the wave buffer queue of a channel and stops playback.
* @param id ID of the channel (0..23).
*/
void ndspChnWaveBufClear(int id);
/**
* @brief Adds a wave buffer to a channel.
* @param id ID of the channel.
* @brief Adds a wave buffer to the wave buffer queue of a channel.
* @remark If the channel's wave buffer queue was empty before the use of this function, playback is started.
* @param id ID of the channel (0..23).
* @param buf Wave buffer to add.
*/
void ndspChnWaveBufAdd(int id, ndspWaveBuf* buf);
@ -132,16 +139,16 @@ void ndspChnWaveBufAdd(int id, ndspWaveBuf* buf);
///@name IIR filters
///@{
/**
* @brief Sets whether the mono filter of a channel is enabled.
* @param id ID of the channel.
* @param enable Whether to enable the mono filter.
* @brief Configures whether the IIR mono filter of a channel is enabled.
* @param id ID of the channel (0..23).
* @param enable Whether to enable the IIR mono filter.
*/
void ndspChnIirMonoSetEnable(int id, bool enable);
// ndspChnIirMonoSetParams
/**
* @brief Sets whether the biquad filter of a channel is enabled.
* @param id ID of the channel.
* @param enable Whether to enable the biquad filter.
* @brief Configures whether the IIR biquad filter of a channel is enabled.
* @param id ID of the channel (0..23).
* @param enable Whether to enable the IIR biquad filter.
*/
void ndspChnIirBiquadSetEnable(int id, bool enable);
// ndspChnIirBiquadSetParams

40
libctru/include/3ds/ndsp/ndsp.h
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@ -1,6 +1,6 @@
/**
* @file ndsp.h
* @brief Nintendo default DSP interface.
* @brief Interface for Nintendo's default DSP component.
*/
#pragma once
@ -9,9 +9,9 @@
/// ADPCM data.
typedef struct
{
u16 index; ///< Current sample index(?)
s16 history0; ///< First previous sample index(?)
s16 history1; ///< Second previous sample index(?)
u16 index; ///< Current predictor index
s16 history0; ///< Last outputted PCM16 sample.
s16 history1; ///< Second to last outputted PCM16 sample.
} ndspAdpcmData;
/// Wave buffer type.
@ -22,25 +22,25 @@ struct tag_ndspWaveBuf
{
union
{
s8* data_pcm8; ///< PCM8 data.
s16* data_pcm16; ///< PCM16 data.
u8* data_adpcm; ///< ADPCM data.
s8* data_pcm8; ///< Pointer to PCM8 sample data.
s16* data_pcm16; ///< Pointer to PCM16 sample data.
u8* data_adpcm; ///< Pointer to DSPADPCM sample data.
u32 data_vaddr; ///< Data virtual address.
};
u32 nsamples; ///< Total samples.
u32 nsamples; ///< Total number of samples (PCM8=bytes, PCM16=halfwords, DSPADPCM=nibbles without frame headers)
ndspAdpcmData* adpcm_data; ///< ADPCM data.
u32 offset; ///< Buffer offset. Only used for capture.
bool looping; ///< Whether to loop the buffer.
u8 padding; ///< Padding.
u16 sequence_id; ///< Sequence ID. Used internally.
ndspWaveBuf* next; ///< Next buffer. Used internally.
u16 sequence_id; ///< Sequence ID. Assigned automatically by ndspChnWaveBufAdd.
ndspWaveBuf* next; ///< Next buffer to play. Used internally, do not modify.
};
/// NDSP callback function. (data = User provided data)
/// Sound frame callback function. (data = User provided data)
typedef void (*ndspCallback)(void* data);
/// NDSP auxiliary callback function. (data = User provided data, nsamples = Number of samples, samples = Sample data)
/// Auxiliary output callback function. (data = User provided data, nsamples = Number of samples, samples = Sample data)
typedef void (*ndspAuxCallback)(void* data, int nsamples, void* samples[4]);
///@}
@ -62,14 +62,14 @@ Result ndspInit(void);
void ndspExit(void);
/**
* @brief Gets the number of dropped NDSP frames.
* @return The number of dropped frames.
* @brief Gets the number of dropped sound frames.
* @return The number of dropped sound frames.
*/
u32 ndspGetDroppedFrames(void);
/**
* @brief Gets the total NDSP frame count.
* @return The total frame count.
* @brief Gets the total sound frame count.
* @return The total sound frame count.
*/
u32 ndspGetFrameCount(void);
///@}
@ -107,7 +107,7 @@ void ndspSetOutputCount(int count);
void ndspSetCapture(ndspWaveBuf* capture);
/**
* @brief Sets the NDSP frame callback.
* @brief Sets the sound frame callback.
* @param callback Callback to set.
* @param data User-defined data to pass to the callback.
*/
@ -138,14 +138,14 @@ void ndspSurroundSetRearRatio(u16 ratio);
///@name Auxiliary output
///@{
/**
* @brief Sets whether an auxiliary output is enabled.
* @brief Configures whether an auxiliary output is enabled.
* @param id ID of the auxiliary output.
* @param enable Whether to enable the auxiliary output.
*/
void ndspAuxSetEnable(int id, bool enable);
/**
* @brief Sets whether an auxiliary output should use front bypass.
* @brief Configures whether an auxiliary output should use front bypass.
* @param id ID of the auxiliary output.
* @param bypass Whether to use front bypass.
*/
@ -159,7 +159,7 @@ void ndspAuxSetFrontBypass(int id, bool bypass);
void ndspAuxSetVolume(int id, float volume);
/**
* @brief Sets the NDSP frame callback of an auxiliary output.
* @brief Sets the callback of an auxiliary output.
* @param id ID of the auxiliary output.
* @param callback Callback to set.
* @param data User-defined data to pass to the callback.