Anders Riggelsen

Visual glBlendFunc + glBlendEquation Tool

+ glBlendFuncSeparate and glBlendEquationSeparate

Premultiply

Display:

glBlendFunc glBlendFuncSeparate

glEquationFunc glBlendEquationSeparate

Source: (foreground)
RGB component

Destination: (background)
RGB component

Blend equation:
RGB component

Input R	=	R
Input G		G
Input B		B
Input A		A

Image presets
Image URLs
Blending color

Foreground:

Background:

(display image size is 400x400)

Hue:

Alpha value:

Graphics from www.interfacelift.com:

Splash by Richard Mohler
Bisti Badlands by Ben DiAnna
Lazy Days II by boss019
Flamingos by Jestrella
Treetops - Michaux State Forest by Se7en
The Road To Bonneville by Chris F
Clouds Over Water by DerekProspero
Starry Night by ManiDProductions
Mt Rainier from Kerry Park by Jeffery Hayes
Moon Rise by Phil2001
Death Star by unknown (google search)

Thanks to:

Alex Huang for finding a bug in in the math for GL_FUNC_REVERSE_SUBTRACT.
David Geier for finding a bug with GL_SRC_COLOR and alpha values.
John Robinson for finding a bug with the mouse-over explanatory calculations for alpha values.
Mikkel Gjoel for finding the bug that new images wasn't premultiplied if the checkbox was checked.