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bryguy512

GLSL : packing normals into 2 bytes

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Hey, I have a deferred lighting question. My lighting looks kinda ugly. I know I need to pack my normal information into 2 channels of my RGBA texture to increase precision. I've scoured the internet for how to do this but have so far been unsuccessful. I've tried (packing): vec3 normal = normal_info; gl_FragData[1] = (normal.x, normal.x * 256.0 - floor(normal.x * 256.0), normal.y, normal.y * 256.0 - floor(normal.y * 256.0)); Unpacking: normal.x = normaltex.x + normaltex.y * 256.0; normal.y = normaltex.z + normaltex.a * 256.0; This doesn't work and it fact looks worse. What is the proper way to do this without bitwise operations?

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Thanks, Farto. Thats an awesome link but I guess my question is actually more general.

How do you put the first 2 bytes of any float, into two channels of a texture?

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I've linked a site that has shader code for (un)packing a float to a vec4. It can easily be modified to handle vec3 and vec2 packing as well.

http://www.ozone3d.net/blogs/lab/20080604/glsl-float-to-rgba8-encoder/

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