#gamedev #opengl #3dgraphics
Hey all, here are some clips I took while building a new rendering pipeline for the 2X and 4Xzoom weapon scopes.

This pipeline involves:
rendering the gun and scope
rendering the nonzoomed scene behind the gun
rendering the zoomed scene within the scope

I use a stencil buffer to restrict the zoomed scene to the scope area.

Each scene stores a unique bit in an extra R8 framebuffer texture, which is used to differentiate between the different scenes in postprocessing shaders.

I apply postprocessing over the entire scene in one pass, using a different inverse view projection for each of the three regions (background, gun and scope) to reconstruct each pixel's worldspace position from a single depth buffer. This worldspace position is then used in lighting, shadows and SSAO shaders.

This seems to be rendering a lot faster than the old blurredbackground method, and the code is a lot simpler too! It feels great to be able to see around me while also aiming at a target through a 2X scope.

Music is by Punch Deck:    / punchdeck  

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