glDisableVertexAttribArray

glDisableVertexAttribArray is an OpenGL function that disables a generic vertex attribute array for the current context. It targets the attribute by its index, turning off per-vertex data sourcing for that attribute in subsequent draw calls.

When a vertex attribute array is enabled, the vertex shader input at that location receives data from the bound vertex buffer via glVertexAttribPointer. When the array is disabled, the shader uses a constant value for that attribute for all vertices. If no explicit constant value has been set, the attribute uses its default value, typically (0, 0, 0, 1). The relation between an attribute index and a shader input is determined by the shader’s layout qualifiers or by binding locations (for example, via glBindAttribLocation).

glDisableVertexAttribArray is commonly used to simplify rendering setups or to provide constant values for certain attributes, such as a fixed color or normal, while other attributes still source data from buffers. The state persists across draw calls until you re-enable the attribute array or change the constant value with glVertexAttrib*.

A typical pattern might be: glDisableVertexAttribArray(0); glVertexAttrib4f(0, 1.0f, 0.0f, 0.0f, 1.0f); // render. The constant value will be used for attribute 0 until it is re-enabled or a new constant is supplied.

Notes: The function accepts a GLuint index and affects the current program state. It is part of the programmable pipeline’s vertex attribute management and is used together with glEnableVertexAttribArray, glVertexAttribPointer, and shader attribute bindings.