Unit CastleScreenEffects

Warning: this symbol is deprecated: this will be internal function soon, instead use TCastleScreenEffects or TCastleViewport and add screen effects there

Standard GLSL vertex shader for screen effect. In your own programs, it's usually easier to use TGLSLScreenEffect, and then this function is not necessary.

Warning: this symbol is deprecated: this will be internal function soon, instead use TCastleScreenEffects or TCastleViewport and add screen effects there

Library of GLSL fragment shader functions useful for screen effects. This looks at current OpenGL context multi-sampling capabilities to return the correct shader code.

In your own programs, it's usually easier to use TGLSLScreenEffect, and then this function is not necessary.

Note that to work with OpenGLES, we have to glue all fragment shaders, and ScreenEffectFragment must be before the actual shader code. The string returned by this function is guaranteed to end with a newline, to make it easy.

So you usually want to create screen effect shaders like this:

Shader := TGLSLProgram.Create;
Shader.AttachVertexShader(ScreenEffectVertex);
Shader.AttachFragmentShader(
  ScreenEffectFragment(false { or true if you use depth }) +
  '... my custom screen effect GLSL code ...');
Shader.Link;
{ umIgnore is a good idea here, in case some uniform variable
  from ScreenEffectFragment code may be left unused. }
Shader.UniformMissing := umIgnore;