Matrix parameter not recognised in pixel shader?

[jnoyola]

Is it possible you’re experiencing the same issue I saw here?

Shader parameter order bug

I think I see the problem! Since I’m not using LightScreenPos.z, that means I’m not using the 3rd column of LightViewProjection. When HLSL is converted to GLSL, matrices are each converted to 4 separate column vectors. The compiler is recognizing that the 3rd column is not being used, and it isn’t leaving space for it when pulling column vectors from the buffer. Columns 1, 2, and 4 are read consecutively. This vital info is being lost, however, when MonoGame is setting the buffer. Whenever you…

The shader compiler can aggressively optimize away entire columns of your matrix, but MonoGame isn’t aware of that when setting parameters from code.