Photoshop blending mode to OpenGL ES without shaders -


In my OpenGL ES 1.1 code, it is necessary to copy Photoshop compositing mode ("Multiplication", "Screen" etc.) I

How to do HLSL:

Let me minimize the screen mode the wanted.

Is there any implementation on the fixed pipeline?

<

Most Photoshop mix-mode are based on Porter-deff blend mode.

It is necessary that all your images (text, Renderbuffer) are in premultiplied color space. This is usually done by multiplying all the pixel-values ​​with alpha-well before aligning them in texture. Just like a full transparent pixel will look like black in a non-premierepled color space. If you are unfamiliar with this color space, then spend an hour or two about it on the web. This is a clean and good concept and is essential for compositions like Photoshop.

However - once you have your images in that format, you can enable using the screen: 

  glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_COLOR)

OpenGL | ES pipeline is not possible with full multi mode if you only work with full opaque pixels, then you can duplicate it using: 

  glBlendFunc (GL_ZERO, GL_SRC_COLOR)

The result for transparent pixels will be wrong in either your texture or your framebuffer.


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