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The compiled programs are executed on the GPU. OpenGL Shading Language ( GLSL) is a high-level shading language with a syntax based on the C programming language. It was created by the OpenGL ARB (OpenGL Architecture Review Board) to give developers more direct control of the graphics pipeline without having to use ARB assembly language or ...
One notable feature is 'Export to Xcode'. A sample Xcode project is created with C source code to initialize OpenGL (using the GLUT library) and run the shader program. Note that this program is no longer recommended for editing GLSL shaders as "GLSLEditorSample," available as an example program, is generally regarded as superior.