If you're doing composition on the GPU, you have to write out a framebuffer to memory so scanout can read it.
No, it’s not. You have to repaint those pixels anyway, whether they’re cached in a texture or not.
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Again: Vertex shading is less than 1% of GPU time, and we Z-cull to avoid overdraw.
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I'm not talking about vertex shading. I'm talking about fragment shading + copying pixels
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