getNTextures
⚠️ Deprecated ⚠️
This is deprecated since version 4.16.
GTK's new Vulkan-focused rendering does not support this feature. Use ../gtk4/class.GLArea.html for OpenGL rendering.
Returns the number of textures that the shader requires.
This can be used to check that the a passed shader works in your usecase. It is determined by looking at the highest u_textureN value that the shader defines.
Return
The number of texture inputs required by @shader