b939b60c3f
This patch implements the Z Combine node for the realtime compositor. The patch also extends the SMAA implementation to work with float textures as a prerequisite to the Z Combine implementation. Moreover, a mechanism for computing multi-output operations was implemented, in which unneeded outputs will allocate a dummy 1x1 texture for a correct shader invocation, then those dummy textures will be cleaned up by calling a routine right after evaluation. This is different from the CPU implementation in that the while combine mask is anti-aliased, including the alpha mask, which is not considered in the CPU case. The node can be implemented as a GPU shader operation when the anti-aliasing option is disabled, which is something we should do when the evaluator allows nodes be executed as both standard and GPU shader operations. Pull Request: https://projects.blender.org/blender/blender/pulls/106637
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