Bloom Demo, features grid

Author: monkstone

external_library/java/pixel_flow/bloom_demo.rb

@@ -0,0 +1,165 @@
+#!/usr/bin/env jruby
+
+require 'propane'
+
+class BloomDemo < Propane::App
+
+  load_library :pixel_flow
+  java_import 'com.thomasdiewald.pixelflow.java.DwPixelFlow'
+  java_import 'com.thomasdiewald.pixelflow.java.imageprocessing.filter.DwFilter'
+  #
+  # PixelFlow | Copyright (C) 2016 Thomas Diewald - http://thomasdiewald.com
+  #
+  # A Processing/Java library for high performance GPU-Computing (GLSL).
+  # MIT License: https://opensource.org/licenses/MIT
+  #
+  #
+  # Bloom Shader applied as post-processing effect on a simple 2D scene.
+  #
+  VIEWPORT_W = 1280
+  VIEWPORT_H = 720
+  VIEWPORT_X = 230
+  VIEWPORT_Y = 0
+
+  attr_reader :context, :filter, :pg_render, :pg_luminance, :pg_bloom, :font12
+  attr_reader :display_mode
+
+  def settings
+    size(VIEWPORT_W, VIEWPORT_H, P2D)
+    smooth(0)
+  end
+
+  def setup
+    surface.setLocation(VIEWPORT_X, VIEWPORT_Y)
+    @display_mode = '1'
+    @context = DwPixelFlow.new(self)
+    context.print
+    context.printGL
+    @filter = DwFilter.new(context)
+    @pg_render = create_graphics(width, height, P2D)
+    pg_render.smooth(8)
+    @pg_luminance = create_graphics(width, height, P2D)
+    pg_luminance.smooth(8)
+    @pg_bloom = create_graphics(width, height, P2D)
+    pg_bloom.smooth(8)
+    @font12 = create_font("SourceCodePro-Regular", 12)
+    background(0)
+    #    frame_rate(60)
+    frame_rate(1000)
+  end
+
+  def draw
+    # just draw something into pg_src_A
+    pg_render.begin_draw
+    pg_render.blend_mode(BLEND) # default
+    pg_render.rect_mode(CENTER)
+    pg_render.background(0)
+    num_x = 20
+    num_y = (num_x / (width /  height)).ceil
+    size_x = (width  - 1) / num_x.to_f
+    size_y = (height - 1) / num_y.to_f
+    scale_xy = 0.4
+    grid(num_y, num_x) do |y, x| # using the JRubyArt convenience grid method
+      px = x * size_x + size_x * 0.5
+      py = y * size_y + size_y * 0.5
+      norm_x = x / (num_x - 1).to_f
+      norm_y = y / (num_y - 1).to_f
+      rgb_r = 255 - 255 * norm_x * norm_y
+      rgb_g = norm_x * 255
+      rgb_b = norm_y * 255
+      col = color(rgb_r, rgb_g, rgb_b)
+      pg_render.push_matrix
+      pg_render.translate(px, py)
+      pg_render.stroke_weight(2)
+      pg_render.stroke(col)
+      if( ((x^y)&1) == 0)
+        pg_render.fill(col)
+      else
+        pg_render.no_fill
+      end
+      pg_render.rect(0, 0, size_x * scale_xy, size_y * scale_xy, 0)
+      pg_render.pop_matrix
+    end
+    pg_render.stroke(255)
+    pg_render.fill(0, 240)
+    pg_render.stroke_weight(2)
+    pg_render.ellipse(mouse_x, mouse_y, height / 4, height / 4)
+    pg_render.end_draw
+    unless display_mode == '0'
+      # luminance pass
+      filter.luminance_threshold.param.threshold = 0.0 # when 0, all colors are used
+      filter.luminance_threshold.param.exponent = 5
+      filter.luminance_threshold.apply(pg_render, pg_luminance)
+
+      # bloom pass
+      # if the original image is used as source, the previous luminance pass
+      # can just be skipped
+      filter.bloom.param.mult = map1d(mouse_x, 0..width, 0..10)
+      filter.bloom.param.radius = map1d(mouse_y, 0..height, 0..1)
+      filter.bloom.apply(pg_luminance, pg_bloom, pg_render)
+    end
+    case(display_mode)
+    when '2'
+      filter.copy.apply(pg_bloom, pg_render)
+    when '3'
+      filter.copy.apply(pg_luminance, pg_render)
+    when '4'
+      filter.copy.apply(filter.bloom.gaussianpyramid.tex_blur[0], pg_render)
+    when '5'
+      filter.copy.apply(filter.bloom.gaussianpyramid.tex_blur[1], pg_render)
+    when '6'
+      filter.copy.apply(filter.bloom.gaussianpyramid.tex_blur[2], pg_render)
+    when '7'
+      filter.copy.apply(filter.bloom.gaussianpyramid.tex_blur[3], pg_render)
+    when '8'
+      filter.copy.apply(filter.bloom.gaussianpyramid.tex_blur[4], pg_render)
+    end
+    # display result
+    blend_mode(REPLACE)
+    background(0)
+    image(pg_render, 0, 0)
+
+    # mouse position hints
+    s = 3
+    blend_mode(BLEND)
+    stroke_cap(SQUARE)
+    stroke_weight(s * 2)
+    stroke(0, 50)
+    line(0, s, width, s)
+    line(s, 0, s, height)
+    stroke(0, 160)
+    line(0, s, mouse_x, s)
+    line(s, 0, s, mouse_y)
+    # info
+    format_string = 'Bloom Demo [size %d/%d] [mode %d] [frame %d] [fps: (%6.2f)]'
+    fps = format(format_string, pg_render.width, pg_render.height, display_mode, frame_count, frame_rate)
+    surface.set_title(fps)
+    # ke_y hints
+    text_font(font12)
+    tx = 15
+    ty = 15
+    gap = 15
+    stroke(255)
+    text(fps, tx, ty += gap)
+    text("'0' bloom OFF" , tx, ty += gap)
+    text("'1' Bloom ON"  , tx, ty += gap)
+    text("'2' bloom only", tx, ty += gap)
+    text("'3' Luminance" , tx, ty += gap)
+    text("'4' Blur[0]"   , tx, ty += gap)
+    text("'5' Blur[1]"   , tx, ty += gap)
+    text("'6' Blur[2]"   , tx, ty += gap)
+    text("'7' Blur[3]"   , tx, ty += gap)
+    text("'8' Blur[4]"   , tx, ty += gap)
+    text("mouseX: bloom multiplier"   , tx, ty += gap)
+    text("mouseY: bloom radius"       , tx, ty += gap)
+  end
+
+  def key_released
+    case key
+    when '0'..'8'
+      @display_mode = key
+    end
+  end
+end
+
+BloomDemo.new