How to bind arbitrary uniforms from code?

[panthavma]

Hi! I want to bind some uniforms manually, either from a world parameter or with an arbitrary value. I think I need UBOs for that, but I didn't find the correct path in the code. Do you know how to do it ?

Something like the code here:

def __init__(self, plugins=[]):
    # [...]
    self.parameters.world['ParamGlobal'] = Parameter(0, Type.FLOAT)

def do_render(self, resolution, scene, is_final_render, is_new_frame):
    #CustomMaterial.shader['MAIN_PASS'].uniforms['paramLocal'] = 5.0
    #CustomMaterial.shader['MAIN_PASS'].uniforms['paramGlobal'] = self.parameters.world['ParamGlobal']
    self.draw_screen_pass(CustomMaterial.shader['MAIN_PASS'], self.renderTarget)

As an additional related question, do you know how to get the current value of a parameter ?

[pragma37]

You can do:

CustomMaterial.shader['MAIN_PASS'].uniforms['paramLocal'].set_value(5.0)

If you modify the value after binding the material you would have to call GLUniform.bind too:

CustomMaterial.shader['MAIN_PASS'].uniforms['paramLocal'].bind()

Here's the GLUniform class:
https://github.com/bnpr/Malt/blob/Development/Malt/GL/Shader.py#L77

For an example on how to use UBOs, you can check the CommonBuffer:
https://github.com/bnpr/Malt/blob/Development/Malt/Render/Common.py

[panthavma]

It works! Thanks!