Indexed-Tile-Shader
A shader that draws a indexed image array
Sometimes you don't want to allocate a whole 32 bpp image in memory and a palette too. This shaders takes a color array and a byte array directly and draws it to a quad.
Uniforms
uniform vec3[] pal; //The 3 component rrggbb color array for a palette
uniform int [] img; //The image data which points to the palette
uniform int imgW; //The image width in pixels
uniform int imgH; //The image height in pixels
uniform int imgR; //The image rotation from 0 being 0 and 3 being 270
uniform bool imgFX; //The image x flip
uniform bool imgFY; //The image y flip
Make sure you draw a white quad as big as you need your image.