GLFUNCSUBTRACT

GLFUNCSUBTRACT is a function in the OpenGL Shading Language (GLSL), used for subtracting two vectors or scalars. It is a built-in function that operates element-wise on the input values, making it useful for various vector and matrix operations in shader programs. The function takes two parameters, which can be either vectors or scalars, and returns the result of subtracting the second parameter from the first. For example, GLFUNCSUBTRACT(vec3(1.0, 2.0, 3.0), vec3(0.5, 1.0, 1.5)) would return vec3(0.5, 1.0, 1.5). This function is particularly useful in shader programming for tasks such as calculating differences in color values, determining the direction between two points, or adjusting vertex positions. It is a fundamental operation in GLSL, enabling developers to create complex visual effects and optimizations in their graphics applications.