Perlin Noise Shader
I did it!!
After hours and hours of reading tutorials on HLSL coding, I finally managed to write a perlin noise shader. The result? Unbelievable speed. At least 100x faster than the CPU-based implementation I coded a few months ago. It can easily display a new 512 by 512 heightmap at 60 FPS. Yes, that's 60 unique heightmaps in one second.
With this kind of raw power now available to me for procedural content generation, I know that great things lie ahead in terms of my work with virtual worlds.
For reference (since I lost the old one and had to rewrite from scratch), here's the noise function I used:
float Noise2D(float x,float y)
float a = acos(cos(((x+SEED*9939.0134)*(x+546.1976)+1)/(y*(y+48.9995)+149.7913)) + sin(x+y/71.0013))/PI;
float b = sin(a*10000+SEED) + 1;