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| − | {{research|1|Details are subject to corrections}}
| + | #REDIRECT [[Particle Script]] |
| − | Retro games feature a uniform, fixed-function '''Particle Script''' system for describing various geometrical effects and weapon systems.
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| − | The PAK archives contain binary resources using [[wikipedia:FourCC|FourCCs]] to build a [[wikipedia:Associative_array|key-value dictionary]].
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| − | These codes correspond to application-specific parameters controlling the system in question.
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| − | | + | |
| − | The scripts use a [[wikipedia:Dataflow programming|dataflow paradigm]] built around value-generating ''element'' classes of the following types:
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| − | | + | |
| − | * [[#Int Elements|Int]]
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| − | * [[#Real Elements|Real]] (float)
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| − | * [[#Vector Elements|Vector]] (3-component float)
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| − | * [[#Mod Vector Elements|Mod Vector]] (3-component float)
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| − | ** Velocity vector in/out
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| − | ** Position vector in/out
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| − | * [[#Color Elements|Color]] (4-component float, internally converted to RGBA8)
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| − | * [[#UV Elements|UV]] ([[TXTR_(File_Format)|TXTR]] reference and [[wikipedia:UV_mapping|UV coordinate]] source)
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| − | * [[#Emitter Elements|Emitter]]
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| − | ** Initial position vector (3-component float)
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| − | ** Initial velocity vector (3-component float)
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| − | The system features several subclasses that output generated values through <code>GetValue</code> as a function of the current frame index.
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| − | These implementations may recursively accept input from other elements, permitting effect designs of scalable complexity.
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| − | | + | |
| − | == File Layout ==
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| − | | + | |
| − | All effect script file formats are read linearly to populate a ''descriptor'' tree of element nodes:
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| − | | + | |
| − | * Script Magic FourCC (see [[#Script Types|table below]])
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| − | * Parameters
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| − | ** Key FourCC
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| − | ** Value Parameter(s) (one of:)
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| − | *** <code>NONE</code>: null value (equivalent to not specifying the key at all)
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| − | *** Element FourCC ([[#Elements|see below]])
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| − | **** Child Elements (count/types according to parent)
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| − | * <code>_END</code>
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| − | | + | |
| − | == Script Types ==
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| − | {| class="wikitable"
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| − | !Type
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| − | !Magic
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| − | !Purpose
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| − | |-
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| − | |[[PART (File Format)|PART]]
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| − | |<code>GPSM</code>
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| − | |Particle element generator
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| − | |-
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| − | |[[SWHC (File Format)|SWHC]]
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| − | |<code>SWSH</code>
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| − | |Swoosh generator
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| − | |-
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| − | |[[ELSC (File Format)|ELSC]]
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| − | |<code>ELSM</code>
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| − | |Electric generator
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| − | |-
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| − | |[[DPSC (File Format)|DPSC]]
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| − | |<code>DPSM</code>
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| − | |Decal generator
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| − | |-
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| − | |[[WPSC (File Format)|WPSC]]
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| − | |<code>WPSM</code>
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| − | |Projectile weapon configuration
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| − | |-
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| − | |[[CRSC (File Format)|CRSC]]
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| − | |<code>CRSM</code>
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| − | |Projectile collision response configuration
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| − | |}
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| − | | + | |
| − | == Elements ==
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| − | | + | |
| − | Many of the animated qualities in particle scripts are achieved with dynamic ''elements''.
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| − | These elements provide I/O interfaces and internally process numeric data that passes through.
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| − | They may also gather data from other sources within the particle system's state.
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| − | | + | |
| − | === Int Elements ===
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| − | {| class="wikitable"
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| − | ! FourCC
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| − | ! Parameters
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| − | ! Description
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| − | ! Notes
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| − | ! MP1
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| − | ! MP2
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| − | ! MP3
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| − | ! DKCR
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| − | ! DKCTF
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| − | {{ParticleElementRow|ADD_|IntElement a, IntElement b|Add|Returns ''a'' + ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|CHAN|IntElement a, IntElement b, IntElement thresholdFrame|Time Chain|Returns ''a'' when current frame index is less-than ''thresholdFrame'', otherwise ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|CLMP|IntElement min, IntElement max, IntElement val|Clamp|Returns ''val'' clamped between ''min'' and ''max''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|CNST|s32 value|Constant|Returns ''value'' on every call|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|DETH|IntElement passthrough, IntElement thresholdFrame|Death|Always returns ''passthrough'', and signals out-of-band to cease updating the system when the current frame index exceeds ''thresholdFrame''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|GAPC||{{unknown|'''Unknown'''}}||{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|GEMT||{{unknown|'''Unknown'''}}||{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|GTCP||{{unknown|'''Unknown'''}}||{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|ILPT|IntElement percent|Lifetime Percent|Queries the frame index at ''percent''/100.0 into the lifetime of the particle instance|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|IMPL|IntElement val|Impulse|Returns ''val'' ONLY at frame index 0, then returns 0 for subsequent frames|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|IRND|IntElement a, IntElement b|Initial Random|Rolls a random value between ''a'' and ''b'' on frame index 0; returns that value for subsequent frames|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|KEYE|[[#Keyframe Emitter Template|KeyframeEmitterData]] data|Keyframe Emitter|List of synchronized animation keys|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|KEYP|[[#Keyframe Emitter Template|KeyframeEmitterData]] data|Keyframe Emitter|List of percentage-tweened animation keys|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|MODU|IntElement a, IntElement b|Modulo|Returns ''a'' % ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|MULT|IntElement a, IntElement b|Multiply|Returns ''a'' * ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|PULS|IntElement aDuration, IntElement bDuration, IntElement a, IntElement b|Pulse|Returns ''a'' for ''aDuration'' frames then ''b'' for ''bDuration'' frames, then repeats this cycle|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|RAND|IntElement a, IntElement b|Random|Rolls a random value between ''a'' and ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|SPAH|IntElement val, IntElement waitMin, IntElement waitMax|Sample And Hold|Stores ''val'' for a random count of frames between ''waitMin'' and ''waitMax'' and repeats this cycle|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|SUB_|IntElement a, IntElement b|Subtract|Returns ''a'' - ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|TSCL|RealElement dv|Time Scale|Returns ''dv'' times the current frame index (rounding down to nearest integer)|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | |}
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| − | | + | |
| − | === Real Elements ===
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| − | | + | |
| − | {| class="wikitable"
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| − | ! FourCC
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| − | ! Parameters
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| − | ! Description
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| − | ! Notes
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| − | ! MP1
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| − | ! MP2
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| − | ! MP3
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| − | ! DKCR
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| − | ! DKCTF
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| − | {{ParticleElementRow|ADD_|RealElement a, RealElement b|Add|Returns ''a'' + ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|CHAN|RealElement a, RealElement b, IntElement thresholdFrame|Time Chain|Returns ''a'' when current frame index is less-than ''thresholdFrame'', otherwise ''b''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|CLMP|RealElement min, RealElement max, RealElement val|Clamp|Returns ''val'' clamped between ''min'' and ''max''|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | {{ParticleElementRow|CNST|float value|Constant|Returns ''value'' on every call|{{check}}|{{check}}|{{check}}|{{check}}|{{check}}}}
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| − | |}
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| − | | + | |
| − | === Vector Elements ===
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| − | | + | |
| − | === Mod Vector Elements ===
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| − | | + | |
| − | === Color Elements ===
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| − | | + | |
| − | === UV Elements ===
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| − | | + | |
| − | === Emitter Elements ===
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| − | | + | |
| − | | + | |
| − | === Keyframe Emitter Template ===
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| − | | + | |
| − | <code>KEYE</code> and <code>KEYP</code> elements are able to statically encode a list of key values for all element types (except UV and Emitter elements).
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| − | ''T'' represents the type being encoded.
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| − | | + | |
| − | {| class="wikitable"
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| − | ! Data Type
| + | |
| − | ! Description
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| − | ! Notes
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| − | |-
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| − | | u32
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| − | | Percentage-Tweening Flag
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| − | | If non-zero, this is a <code>KEYP</code> and there are exactly 100 keys in the list; all of these keys are linearly-interpolated over the lifetime of the particle instance (however long that may be)
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| − | |-
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| − | | u32
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| − | | {{unknown|'''Unknown'''}}
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| − | | Not used by <code>GetValue</code>
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| − | |-
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| − | | u8
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| − | | Loop Flag
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| − | | If non-zero, the key values are looped between ''loopStart'' and ''loopEnd'' indices (does not apply to <code>KEYP</code>)
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| − | |-
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| − | | u8
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| − | | {{unknown|'''Unknown'''}}
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| − | | Not used by <code>GetValue</code>
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| − | |-
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| − | | u32
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| − | | Loop End
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| − | | Final key index in the loop
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| − | |-
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| − | | u32
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| − | | Loop Start
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| − | | First key index in the loop
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| − | |-
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| − | | u32
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| − | | Key Count
| + | |
| − | | Count of keys encoded in the list
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| − | |-
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| − | | T[keyCount]
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| − | | Keys
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| − | | The actual key values themselves
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| − | |}
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| − | [[Category:File Formats]]
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| − | [[Category:Metroid Prime]]
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| − | [[Category:Metroid Prime 2: Echoes]]
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| − | [[Category:Metroid Prime 3: Corruption]]
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| − | [[Category:Donkey Kong Country Returns]]
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