Can I find the internal texture format in the shader?

Question

Is it possible to find the internal texture format in the shader (glsl)?

For example, if I have a texture with a format GL_RG, is it possible to recognize in the shader that the blue and alpha values ​​are "constant" and can be ignored?

I know that I can use a form to pass a texture type from C ++ to shaders. But is there an “internal” way to learn from a shader?

Answer 1

No, I do not believe that there is anything that will give you this information directly.

GLSL (4.50 ), , "8.9.1. ", 158. :

• textureSize: .
• textureQueryLod: , .
• textureQueryLevels: mipmap .
• textureSamples: .

, - , , , , .