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Blend with vec3

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what happend when you turn on blend and output a vec3?

 

such as:

 

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
layout(location = 2) out vec3 o_normal;

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nothing. 

 

 

 

Blending is the stage of OpenGL rendering pipeline that takes the fragment color outputs from the Fragment Shader and combines them with the colors in the color buffers that these outputs map to. Blending parameters can allow the source and destination colors for each output to be combined in various ways.

 

 

taken from:

https://www.opengl.org/wiki/Blending

 

 

basically blending only affects colors

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nothing. 

 

 

 

Blending is the stage of OpenGL rendering pipeline that takes the fragment color outputs from the Fragment Shader and combines them with the colors in the color buffers that these outputs map to. Blending parameters can allow the source and destination colors for each output to be combined in various ways.

 

 

taken from:

https://www.opengl.org/wiki/Blending

 

 

basically blending only affects colors

 

it means there is no output at all??

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what happend when you turn on blend and output a vec3?

OpenGL will invent an alpha/'w' component for you. You'd have to double check with the spec, but it will likely use 1.0, or if not that, then 0.0...

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what happend when you turn on blend and output a vec3?

OpenGL will invent an alpha/'w' component for you. You'd have to double check with the spec, but it will likely use 1.0, or if not that, then 0.0...

 

thank you, your answer is just like what i think, i will try it.

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