[Supertuxkart-commit] [supertuxkart/stk-code] 251c46: Always call bind sampler function.

[GitHub <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/supertuxkart/stk-code
  Commit: 251c46dcc443a0a8199ee07b25045435b88d657d
      https://github.com/supertuxkart/stk-code/commit/251c46dcc443a0a8199ee07b25045435b88d657d
  Author: Deve <de...@gm...>
  Date:   2017-02-17 (Fri, 17 Feb 2017)

  Changed paths:
    M src/graphics/texture_shader.hpp

  Log Message:
  -----------
  Always call bind sampler function.

This fixes errors for Intel HD4000 on Windows.

My understending of this issue is following:
- a shader assigned two textures, i.e. texture1 = sampler1, texture2=sampler2
- then next shader (i.e. importance sampling specular) assigned two textures: texture1=sampler1, texture2=without_sampler
- when we executed setTextureUnits, the glBindSampler function wasn't called at all, so the drivers were trying to use combination texture2=sampler2, even though the sampler2 was prepared for different texture and most likely was already deleted.

We can just always call the glBindSampler function, so that if texture doesn't have a sampler, it will execute it with sampler_id=0 param, which is practically an "unbind" function.