Easy shaders

[melody-rs]

• Ability to compile shaders from ruby
• Set shader uniforms from ruby
• Application methods
  • Sprite.shaders
  • Viewport.shaders
  • Bitmap.apply_shader
  • Plane.shaders
• Automatic type conversion from ruby (Bitmap -> sampler2D, Integer -> int, etc)
• Ditch usage of #include "binding-util.h" (hopefully)

[melody-rs]

• Tweak XXD to add include gaurds

[melody-rs]

• Vec2 & Vec4 don't set values properly (maybe?)
• Shaders don't stack
• Shader deconstruction is messy, usually results in an assertion error
• Rename args to uniforms instead as its a misleading name
• Optimize where possible
• Remove the extra shader include (requires adding include guards to xxd)

[melody-rs]

• Add extra shader uniform detections (alpha, tone, etc)

[Eblo]

Hello! I found a bug and also have a potential fix that I have in my own fork. Shader linking seems to fail, but only on certain machines.

Between testing 4 different machines, it looks like shader linking fails when running a machine with integrated graphics. The default mkxp shaders seem to work fine, but compiling custom shaders through this setup would throw "Shader linking failed with", except the log would be completely empty.

Some stackoverflow-ing later, I found that the specific issue of empty shader logs comes when you try to link a fragment shader without a vertex shader https://stackoverflow.com/questions/21555186/glsl-shader-linking-fail-but-no-log

I implemented an admittedly lazy fix of assuming the vertex shader is always handled after the fragment shader. This is good enough for me, but you may or may not want to do something more robust. Here is my own fix for reference. Let me know if you can't access it: Eblo/mkxp-eulogy@c587418

[melody-rs]

Thank you! I'm no longer maintaining ModShot but I'll see what I can do.