FeatureRequest: Add vec3 or vec4 mode for shader debugging.

[gonnavis]

Could you please add a new vec4 mode to facilitate the shader debugging?

This mode will map 0,255 to 0,1.

For example:

rgb(0, 127, 255) to vec4(0, .5, 1, 1)

rgb(100, 50, 75) to vec4(0.392, 0.196, .294, 1)

[martinchrzan]

Will do, thanks for a suggestion!