Experiments with ruby-processing (processing-2.2.1) and JRubyArt for processing-3.0

Tuesday, 4 December 2012

Landscape shader in ruby-processing

Feels like I'm on a roll, here is the processing-2.0 landscape shader example running with ruby-processing.
# Landscape
# Simple raymarching shader with camera, originally by Paulo Falc√£o
# Ported from the webGL version in GLSL Sandbox:
# http://glsl.heroku.com/e//3213.0

attr_reader :landscape, :pg

def setup
  size(640, 360, P2D)

  # This effect can be too demanding on older GPUs, 
  # so we can render it on a smaller res offscreen surface
  # @pg = create_graphics(320, 180, P2D)
  @pg = create_graphics(640, 360, P2D)
  @landscape = load_shader("landscape.glsl")
  landscape.set("resolution", width.to_f, height.to_f)

def draw
  landscape.set("time", millis() / 1000.0)
  landscape.set("mouse", mouse_x.to_f, height - mouse_y.to_f)

  # This kind of raymarching effects are entirely implemented in the
  # fragment shader, they only need a quad covering the entire view 
  # area so every pixel is pushed through the shader.  
  pg.rect(0, 0, width, height)

  # Scaling up offscreen surface to cover entire screen (if reduced).
  image(pg, 0, 0, width, height)

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I have developed JRubyArt and propane new versions of ruby-processing for JRuby- and processing-3.2.2