SetUniforms extension

A helper extension on ui.FragmentShader that allows you to set uniforms in a more convenient way. Withotu having to manage indices.

Example:

shader.setFloatUniforms((setter) {
 setter.setFloat(1.0);
 setter.setFloats([1.0, 2.0, 3.0]);
 setter.setSize(const Size(1.0, 2.0));
 setter.setSizes([const Size(1.0, 2.0), const Size(3.0, 4.0)]);
 setter.setOffset(const Offset(1.0, 2.0));
 setter.setOffsets([const Offset(1.0, 2.0), const Offset(3.0, 4.0)]);
 setter.setMatrix(Matrix4.identity());
 setter.setMatrices([Matrix4.identity(), Matrix4.identity()]);
 setter.setColor(Colors.red);
 setter.setColors([Colors.red, Colors.green]);
});

The receiving end of this script should be:

uniform float u0; // 1.0
uniform float[3] uFloats; // float[3](1.0, 2.0, 3.0)
uniform vec2 size; // vec2(1.0, 2.0)
uniform vec2[2] sizes; // vec2[2](vec2(1.0, 2.0), vec2(3.0, 4.0))
uniform vec2 offset; // vec2(1.0, 2.0)
uniform vec2[2] offsets; // vec2[2](vec2(1.0, 2.0), vec2(3.0, 4.0))
uniform mat4 matrix; // mat4(1.0)
uniform mat4[2] matrices; // mat4[2](mat4(1.0), mat4(1.0))
uniform vec4 color; // vec4(1.0, 0.0, 0.0, 1.0)
uniform vec4[2] colors; // vec4[2](vec4(1.0, 0.0, 0.0, 1.0), vec4(0.0, 1.0, 0.0, 1.0))

The initialIndex parameter allows you to set the index of the first uniform. Defaults to 0.

Returns the index of the last uniform that was set.