Logical Operation

OpenGL Rendering Pipeline

Rendering Pipeline Overview

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• 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

A Logical Operation is a per-sample operation applied between the fragment's color values and color values in the corresponding sample in the framebuffer. They are performed independently for the RGBA components of the colors, and they only work for framebuffer attachments that are integers (normalized or not). And even then, they do not work for rendering to sRGB images if GL_FRAMEBUFFER_SRGB is active.

Enabling logical operations automatically turns off Blending.