c++ - glsl - get pixel color [pixel shader] -

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is there way drawed pixel color (from backbuffer, not current drawing pixel)?

for example: i'm drawing rectangle texture , drawing circle (in blue color) on rectangle. if use pixel shader on circle, there way current pixel color backbuffer (pixel rectangle)?

i think want color of pixel frame buffer use glreadpixels() return pixel data frame buffer.

https://www.opengl.org/sdk/docs/man2/xhtml/glreadpixels.xml


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