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- In a complex material, compiler may not be able to see through the code to discover all unused inputs. E.g. first pass compilation says that input A is unused, but B and C are used. After we rewrite the code to remove A, the code is simpler and compiler is now able to see that B is also unused. Since we pass the "used attributes" to the next stage, this creates a mismatch where vertex shader outputs only C, but pixel shader (rewritten based on the first pass results) expects B and C. - The fixed code will check if the unused inputs changed, and if so, will go back and rewrite the code based on a more complete info. - This fixes a bug that JonL ran into for which I haven't yet created a JIRA (will do before checkin). #rb Ben.Ingram, Rolando.Caloca, Jason.Nadro [REVIEW] [at]Lukas.Hermanns, [at]Rolando.Caloca, [at]Ben.Ingram, [at]Jason.Nadro, [at]Kevin.Ortegren #jira UE-115083 #ROBOMERGE-SOURCE: CL 16312596 in //UE5/Main/... #ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v804-16311228) [CL 16312617 by arciel rekman in ue5-release-engine-test branch]