4ac0267567
This PR adds support for specialization constants for the OpenGL backend. The minimum OpenGL version we are targetting doesn't have native support for specialization constants. We simulate this by keeping track of shader programs for each set of specialization constants that are being used. Specialization constants can be used to reduce shader complexity and improve performance as less registry and/or spilling is done. This requires the ability to recompile GLShaders. In order to do this we need to keep track of the sources that are used when the shader was compiled. For static sources we only store references (`GLSource::source_ref`), for dynamically generated sources we keep a copy of the source (`GLSource::source`). When recompiling the shader GLSL source-code is generated for the constants stored in `Shader::constants`. When compiling the previous GLSource that contains specialization constants is then replaced by the new version. Pull Request: https://projects.blender.org/blender/blender/pulls/116926
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