Fixing PBR on <= GLSL 130:#1321

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MeFisto94 merged 2 commits intojMonkeyEngine:masterfrom

MeFisto94:fix-pbr-opengl2-part2

Apr 4, 2020

Commits on Apr 4, 2020

Fixing PBR on <= GLSL 130:
MeFisto94
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GLSLCompat: The Matrix3 Sub-Constructor is called mat3_sub and defers to the builtin mat3 if available.
MeFisto94
committed