Tag Archives: 3D

Minecraft 4K C++ Port

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A while ago I discovered Minecraft4k, a java demo written by Notch fitting into a 4kb object file.  He used software raycasting to rasterize a large 3d array of voxels. The original demo can be played here as an applet:

https://mojang.com/notch/j4k/minecraft4k/

At the same time I found that Notch had made a Javascript port of the same basic engine, minus user input.

http://jsdo.it/notch/dB1E

One awesome thing about these two demos is that all of the textures are synthesized proceduraly for space saving reasons.

Seeing his work, I got a strong urge to port the code to C++ and SDL.

Grab the source code here:

http://pastebin.com/jfjqAas8

Retro CRT Shader

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cap

  extern number time;
  vec4 effect( vec4 color, Image tex, vec2 tex_uv, vec2 pix_uv )
  {  
    // per row offset
    float f  = sin( tex_uv.y * 320.f * 3.14f );
    // scale to per pixel
    float o  = f * (0.35f / 320.f);
    // scale for subtle effect
    float s  = f * .03f + 0.97f;
    // scan line fading
    float l  = sin( time * 32.f )*.03f + 0.97f;
    // sample in 3 colour offset
    float r = Texel( tex, vec2( tex_uv.x+o, tex_uv.y+o ) ).x;
    float g = Texel( tex, vec2( tex_uv.x-o, tex_uv.y+o ) ).y;
    float b = Texel( tex, vec2( tex_uv.x  , tex_uv.y-o ) ).z;
    // combine as 
    return vec4( r*0.7f, g, b*0.9f, l ) * s;
  }