CODEWITHSUNDEEP
openglglsldepthfbo
ste3e
ste3e

Reputation: 1035

how to handle depth in glsl

I have a problem with FBO and depth in openGL. I am passing projection, view and model matrices to a shader that writes to the g buffer. When I unbind the FBO and write to gl_FragColor the scene displays as it ought. But when I write to gl_FragData[0] then write the accompanying texture to a screen aligned quad, objects are drawn according to inverse order processed rather than depth... I can see through objects processed first to objects processed after. Has anyone had the same problem and do they know a fix? Or could someone provide syntax on reading depth values from the vertex shader, querying the current depth, then writing to the depth buffer depending on a comparison, ie, handling the operation manually in the fragment shader.

Upvotes: 2

Views: 1168

Answers (1)

kvark
kvark

Reputation: 5351

Your main frame-buffer most likely has the depth, while your manually created FBO might not have it. Therefore, when drawing to the screen you have depth-sorted geometry, while your FBO can not provide that and internally works with disabled depth testing having no storage associated with it.

Upvotes: 4

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