Transform Feedback

Transform Feedback Core in version 4.6 Core since version 3.0 Core ARB extension ARB_transform_feedback2, ARB_transform_feedback3, ARB_transform_feedback_instanced EXT extension EXT_transform_feedback Vendor extension NV_transform_feedback

OpenGL Rendering Pipeline Rendering Pipeline Overview Vertex Specification Vertex Rendering Primitive Vertex Processing Vertex Shader Tessellation Geometry Shader Vertex Post-Processing Transform Feedback Primitive Assembly Face Culling Rasterization Fragment Shader Per-Sample Processing Scissor Test Stencil Test Depth Test Blending Logical Operation Write Mask

Transform Feedback is the process of altering the rendering pipeline so that primitives processed by a Vertex Shader and optionally a Geometry Shader will be written to buffer objects. This allows one to preserve the post-transform rendering state of an object and resubmit this data multiple times.

Overview

Note: Mention will be made of various functions that deal with multiple stream output. Feedback into multiple streams requires access to OpenGL 4.0 or ARB_transform_feedback3 and ARB_gpu_shader5. So if that is not available to you, ignore any such discussion.

Shader setup

Advanced interleaving

Advanced Feedback Interleaving

Core in version		4.0
Core ARB extension	ARB_transform_feedback3

Multi-stream output

Multi-Stream Output

Core in version		4.0
Core ARB extension	ARB_transform_feedback3

Feedback objects

Transform Feedback Objects

Core in version		4.6
Core since version		4.0
Core ARB extension	ARB_transform_feedback2

Reference

• Category:Core API Ref Transform Feedback: Function documentation for all transform feedback commands, except for those that actually render with the results of a feedback operation.