Class: Vizcore::CLISupport::ShaderTemplate

Inherits:
Object
  • Object
show all
Defined in:
lib/vizcore/cli/shader_template.rb

Overview

Writes starter GLSL ES fragment shaders for custom shader layers.

Constant Summary collapse

TEMPLATE = 
<<~GLSL
  #version 300 es
  precision highp float;

  uniform vec2 u_resolution;
  uniform float u_time;
  uniform float u_amplitude;
  uniform float u_bass;
  uniform float u_mid;
  uniform float u_high;
  uniform float u_bass_peak;
  uniform float u_mid_peak;
  uniform float u_high_peak;
  uniform float u_beat;
  uniform float u_beat_pulse;
  uniform float u_beat_phase;
  uniform float u_bar_phase;
  uniform float u_onset;
  uniform float u_kick;
  uniform float u_bpm;
  uniform float u_fft[32];
  uniform float u_fft_size;

  out vec4 outColor;

  void main() {
    vec2 uv = gl_FragCoord.xy / u_resolution.xy;
    float wave = 0.5 + 0.5 * sin((uv.x + u_time * 0.12 + u_bar_phase * 0.2) * 12.0 + u_bass * 4.0);
    vec3 color = mix(vec3(0.02, 0.06, 0.12), vec3(0.1, 0.75, 0.95), wave);
    color += vec3(0.95, 0.16, 0.32) * (u_beat_pulse * 0.35 + u_onset * 0.2 + u_kick * 0.25 + u_high_peak * 0.2);
    color *= 0.35 + u_amplitude * 1.8;
    outColor = vec4(color, 1.0);
  }
GLSL

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.default_path(name) ⇒ String

Parameters:

  • name (String)

Returns:

  • (String) 


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# File 'lib/vizcore/cli/shader_template.rb', line 47

def self.default_path(name)
  "shaders/#{safe_name(name)}.frag"
end

.safe_name(name) ⇒ String

Parameters:

  • name (String)

Returns:

  • (String)

Raises:

  • (ArgumentError) 


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# File 'lib/vizcore/cli/shader_template.rb', line 53

def self.safe_name(name)
  raw_name = name.to_s.strip.sub(/\.frag\z/i, "")
  safe = raw_name.gsub(/[^a-zA-Z0-9_-]+/, "_").gsub(/\A_+|_+\z/, "")
  raise ArgumentError, "shader name is required" if safe.empty?

  safe
end

Instance Method Details

#write(path) ⇒ Pathname

Parameters:

  • path (String, Pathname)

Returns:

  • (Pathname)

Raises:

  • (ArgumentError) 


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# File 'lib/vizcore/cli/shader_template.rb', line 63

def write(path)
  destination = Pathname(path)
  raise ArgumentError, "Shader file already exists: #{destination}" if destination.exist?

  FileUtils.mkdir_p(destination.dirname)
  destination.write(TEMPLATE)
  destination
end