Framebuffers and Render-to-Texture
A framebuffer object bundles color, depth, and stencil attachments as the render destination; attaching a texture as the color attachment lets one pass render an image that a later pass samples. This render-to-texture loop underlies shadow maps, post-processing, and deferred pipelines; a framebuffer must be 'complete' (compatible attachment formats and sizes) before drawing.
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A framebuffer object bundles color, depth, and stencil attachments as the render destination; attaching a texture as the color attachment lets one pass render an image that a later pass samples. This render-to-texture loop underlies shadow maps, post-processing, and deferred pipelines; a framebuffer must be 'complete' (compatible attachment formats and sizes) before drawing.
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