Crashing after Upgrade

[chilly willy]

Ogre Version: 14.5.0
Operating System: macOS Catalina
Render System: OpenGL 3+

I upgraded from 14.0 to the latest repo and now it crashes with this message:

RenderSystem does not support FixedFunction, but technique of 'Blue' has no Vertex Shader. Use the RTSS or write custom shaders. in SceneManager::_setPass at /Users/chillywilly/Documents/Projects/ogre/OgreMain/src/OgreSceneManager.cpp (line 682)

in SceneManager::_setPass() after it fails this test:

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    else if (!mDestRenderSystem->getCapabilities()->hasCapability(RSC_FIXED_FUNCTION) &&
             !pass->hasGpuProgram(GPT_MESH_PROGRAM))

I am using the RTSS but I do not use material scripts. I create a material programmatically, assign a color to the first technique and then let the RTSS generate a second technique with shaders. I have verified that the second technique with shaders IS being created but it is the first technique without shaders that is causing the crash in _setPass(). It only crashes when (SHADOWTYPE_STENCIL_ADDITIVE) shadows are enabled.

Any ideas where to look/what to do?

[paroj]

Tested the Shadow Sample in the Sample Browser and it works.

probably your viewport is not using the RTSS material scheme.

[chilly willy]

I am setting the scheme with:

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mViewport->setMaterialScheme(Ogre::MSN_SHADERGEN);

I tried different kinds of shadows. Everything works with modulative shadows (both stencil and texture). It only crashes with additive shadows (both stencil and texture).

Any help or ideas is appreciated.

[paroj]

ok, I could reproduce it with the Shadow Sample. It only happens when you start with additive, not when you switch from modulative to additive

[chilly willy]

It seems that SGTechniqueResolverListener::handleSchemeNotFound() is not creating techniques for the MSN_SHADOWCASTER scheme...

[paroj]

this is the commit introducing this: https://github.com/OGRECave/ogre/commit ... 5f8d1df217

It seems bestTechnique is not correctly updated now.

Note that I do see a RTSS technique with shaders in the debugger - it just does not get picked.

The solution would be to call rend->getTechnique again, but at the correct place now

[paroj]

I narrowed it down to this:
https://github.com/OGRECave/ogre/pull/3496

it seems something breaks if Material::compile is called before Material::getBestTechnique (the latter triggers the RTSS).
Not sure if I will have the time to track it further though..

[paroj]

that was a tough one..
The issue was that RTSS passes were added to the queue, but then the material was reloaded which destroyed the RTSS Shaders.

still not 100% sure about the root cause, but this is a fix:

https://github.com/OGRECave/ogre/pull/3498

[chilly willy]

Awesome that you found it. Thank you.
Maybe someday I will understand all this stuff...