transparency/alpha: simple binary transparent/opaque, no blending, just discard some fragments

ImageLoader: convert images always to 8-bit depth as expected by Shark.cpp (i.e. 16-bit images can be loaded now)

monitor texture and shader file writes using inotify: reload textures

use default texture and shaders from the $SHADER_SHARK_DATA_DIR directory, if not configured as command line arguments

private Impl class also for the Shark

mouse wheel: move camera, not object

monitor texture and shader file writes using inotify: reload shaders

monitor texture and shader file writes using inotify: print file events

support custom shaders

OOP for Shader and ShaderProgram

fragment shader: add grayscale() function

clear screen / paint background before loading textures

better GLSL variable names

load textures from PNG, JPEG etc. files using ImageMagick only one (last) texture is currently displayed

project skeleton