Dynamic branching in shader not working. Keeps jumping out.

lipsryme · 2012-07-13T00:47:23

I'm trying to implement a branching inside my uber shader to achieve different material types using deferred shading but keep getting problems with the branching. Now this is where it seems to cause the problem: float4 PS_Directional(VSO input) : SV_TARGET { float4 output = float4(0.0f, 0.0f, 0.0f, 1.0f); // Get Material ID float materialID = tex2D(AlbedoBuffer, input.UV).a; // Get Normals half4 encodedNormal = tex2D(NormalBuffer, input.UV); half3 Normal = mul(normalize(decode(encodedNormal)), inverseView); if(materialID == 0.02f) { output = 1.0f; } return output; } As you can see I'm doing an if on the materialID to set a pixel color specifically for each objects material. Now when I run this I just get a black screen, as it's (output) initialized at the beginning. Running this in PIX I can see him going inside the if statement, setting output to the correct color and then going back to the if statement and returning 0.0f again. What is going on here ? Why does it set the correct color and jump back afterwards to undo it ??

Graphics and GPU Programming Programming

Started by lipsryme July 01, 2012 05:51 PM

9 comments, last by Zoner 11 years, 9 months ago

Zoner

232

July 13, 2012 12:47 AM

I'm dying to really see how well modern hardware handles true branches when you can disregard old hardware, because we work extra hard to flatten our shaders and build custom permutations for all of them in order to minimuze shader ALU processing.

http://www.gearboxsoftware.com/

Dynamic branching in shader not working. Keeps jumping out.

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Dynamic branching in shader not working. Keeps jumping out.

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