Shader albedo clamped to [0, 1]?

Question

I want to write a spatial shader using blend_mul which multiplies the underlying color by values greater than 1. However I've noticed that when I try to write colors with components > 1 to ALBEDO, they get clamped to 1. Is there any way around this? Or are multiplicative shaders limited to only darkening colors. I'm using GLES2.

Comments

check out documentation for render_modeof spatial shaders. There should be something like blend_add or blend_multiply. By default values above 1 should glow.

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Right, I'm already using the render_mode blend_mul. The problem I'm seeing is that I can't set the albedo to anything above 1. If I have eg. ALBEDO = vec3(2.0, 2.0, 2.0);, the shader has no effect, while using 0.5 instead works fine.

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If I remember correctly blendadd will make colors glow, while blendmul will darken them. Do You expect any other effect to happen when color channel values is greater than one ?

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I would expect the colors to be multiplied. So if I use blend_mul with albedo RGB(0.5, 1, 1), then the Red component of all the colors behind the object should be divided by 2 (which is what happens). But if I use albedo (2, 1, 1), I would expect the Red components to be multiplied by 2, but this isn't what happens. So I guess it's limited to 0 - 1? But I don't see why this would be the case, since I thought all the buffers were floating point.

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Basically, how would I write a shader that doubles the color values of everything beneath it? (without using SCREEN_TEXTURE)