glVertexAttrib4findex

glVertexAttrib4findex is a function in the OpenGL programming interface used to specify the value of a generic vertex attribute. This function is part of the OpenGL Shading Language (GLSL) integration with the fixed-function pipeline or when working with programmable shaders. The function allows developers to set a single floating-point vertex attribute with four components.

The parameters for glVertexAttrib4findex are an index and four floating-point values. The index identifies which generic vertex attribute to modify. This index corresponds to the attribute location set in the vertex shader. The four floating-point values represent the x, y, z, and w components of the attribute. For instance, this could be used to set a color, a texture coordinate, or a position that is not directly used by the transformation pipeline but passed to the shader.

This function is typically used to provide per-vertex data that is not part of the standard vertex attributes like position or normal. It offers flexibility in defining custom data that shaders can then utilize for various purposes, such as lighting calculations, special effects, or passing additional information down the rendering pipeline. The use of glVertexAttrib4findex is deprecated in newer versions of OpenGL, with glVertexAttribPointer and similar functions now preferred for more efficient data management.