inject previous buffer as a texture

[gre]

We need a way to inject the previous buffer as a texture. usecase: persistence effect (motion blur)

This is a solution to address gre/gl-react-native-v2#19

API

First idea: <GL.View ... uniforms={{ backbuffer: GL.DrawingBuffer }} />

Second idea (more generic): <GL.View saveBuffer="foo" ... uniforms={{ backbuffer: GL.fromBuffer("foo") }} />

[gre]

more generic way:

<GL.View saveBuffer="foo" ... uniforms={{ backbuffer: GL.fromBuffer("foo") }} />

[gre]

implementers will have to use special framebuffer that are preserved after each render. This new collection of framebuffers should be solved by the core impl. in gl-react-native impl, the fbos are shared, so that means we need a separated collection of fbos that belong to each view. We then need a new internal format to describe where the fbo belong (maybe we can have a fboType field that is either "shared" or "preserved")
we also need to introduce a new "texture type" that will pick from that collection.

Last point is how to handle the specific null framebuffer ? It sounds like we need a copy shader? Maybe we can generalize the idea of "post" shader that draws from a framebuffer to the output.

[gre]

closing this dup in favor of #27

[ptmt]

Awesome!
On Wed, 30 Dec 2015 at 20:03, Gaëtan Renaudeau notifications@github.com
wrote:

Closed #25 https://github.com/ProjectSeptemberInc/gl-react/issues/25.

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