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Fixes for Barriers, SSBO handling, and better PBO-texture copies

Gert Wollny requested to merge gerddie/virglrenderer:vrend-more-barries-and-vs-layers into master
  • Check for GL_AMD_vertex_shader_layer which can be used to enable more cases where copies between PBOs and textures are done on the graphics card.
  • Emitting GL_BUFFER_UPDATE_BARRIER_BIT and GL_TEXTURE_UPDATE_BARRIER_BIT when needed
  • Prepare host for handling SSBO binding offsets that are needed when more than one shader stage uses SSBOs

Guest side changes are here: mesa/mesa!21586 (merged)

Edited by Gert Wollny

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