class

Opal::Shader::ShaderContext

Inherits Reference < Object

Execution context provided to a text fragment shader for each evaluated cell.

Constructors

new(x : Int32, y : Int32, local_x : Int32, local_y : Int32, width : Int32, height : Int32, region_width : Int32, region_height : Int32, time : Float64, frame : UInt64, source_buffer : UI::Buffer, cell : UI::Cell)
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Instance methods

bg

Background color getter & setter

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bg=(color : Color)
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bold!
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bold=(val : Bool)
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bold?

Attribute flags

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cell
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cell=(cell : UI::Cell)
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char

Character getter & setter

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char=(ch : Char)
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dim!
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dim=(val : Bool)
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dim?
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discard

Discards current cell modifications

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discarded=(discarded : Bool)
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discarded?
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dist_center

Distance from center (0.5, 0.5)

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dist_from(cx : Float64, cy : Float64) : Float64

Distance from specific normalized coordinates (cx, cy)

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fg

Foreground color getter & setter

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fg=(color : Color)
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frame
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frame=(frame : UInt64)
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height
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height=(height : Int32)
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invert!
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italic=(val : Bool)
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italic?
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lerp_bg(target : Color, factor : Float64) : Nil

Interpolates active background color toward target color

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lerp_fg(target : Color, factor : Float64) : Nil

Interpolates active foreground color toward target color

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local_u
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local_u=(local_u : Float64)
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local_v
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local_v=(local_v : Float64)
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local_x
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local_x=(local_x : Int32)
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local_y
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local_y=(local_y : Int32)
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noise

Fast deterministic pseudo-random float between 0.0 and 1.0

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region_height
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region_height=(region_height : Int32)
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region_width
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region_width=(region_width : Int32)
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replace_from(other : UI::Cell) : Nil

Replaces current cell state entirely from another cell

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reset(x : Int32, y : Int32, local_x : Int32, local_y : Int32, width : Int32, height : Int32, region_width : Int32, region_height : Int32, time : Float64, frame : UInt64, source_buffer : UI::Buffer, cell : UI::Cell) : Nil

Mutates context in-place to avoid per-cell heap allocations during fragment shader passes

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reverse=(val : Bool)
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reverse?
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sample(sx : Int32, sy : Int32) : UI::Cell

Samples another cell from the input source buffer

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sample_char(sx : Int32, sy : Int32) : Char

Samples only the character from the input source buffer

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sample_fg(sx : Int32, sy : Int32) : Color

Samples only the foreground color from the input source buffer

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source_buffer
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source_buffer=(source_buffer : UI::Buffer)
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time
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time=(time : Float64)
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u=(u : Float64)
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underline=(val : Bool)
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underline?
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v=(v : Float64)
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wave(freq : Float64 = 1.0, speed : Float64 = 1.0) : Float64

Procedural trigonometric wave functions (accelerated via FastMath LUT)

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wave_y(freq : Float64 = 1.0, speed : Float64 = 1.0) : Float64
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width
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width=(width : Int32)
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x=(x : Int32)
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y=(y : Int32)
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