support more procedural shader uniform types, including arrays #1178
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procedural shaders previously supported uniforms of types float, vec2, vec3, and vec4. this PR adds support for mat3, mat4, vec3[], vec4[], mat3[], and mat4[].
here is a script that demonstrates this feature. it creates a procedural particle entity and places a new particle every time you click on an entity (up to 50 particles in this example but it would support more). in the vertex shader, the click positions (and normals) are sent as a uniform vec3[].