gf2d_draw_ops pipeline

[engineerOfLies]

make a pipeline that can take two attachment texture inputs and write to a third texture
the descriptor set will determine the method for combining them (blend/mod/sub/etc)

[engineerOfLies]

Will need to set VK_DYNAMIC_STATE_VIEWPORT when creating the pipeline and then call vkCmdSetViewport before any drawing commands to make sure that the output viewport matched the output image

[engineerOfLies]

if we set VK_DYNAMIC_STATE_COLOR_BLEND_ADVANCED_EXT specifies that the colorBlendOp needs to be specified and must be set dynamically with vkCmdSetColorBlendAdvancedEXT before any draw call.