glVertexAttribPointer

glVertexAttribPointer: man2/glVertexAttribPointer.xml

glVertexAttribPointer specifies the location and data format of the array of generic vertex attributes at index index to use when rendering. size specifies the number of components per attribute and must be 1, 2, 3, or 4. type specifies the data type of each component, and stride specifies the byte stride from one attribute to the next, allowing vertices and attributes to be packed into a single array or stored in separate arrays. If set to GL_TRUE, normalized indicates that values stored in an integer format are to be mapped to the range [-1,1] (for signed values) or [0,1] (for unsigned values) when they are accessed and converted to floating point. Otherwise, values will be converted to floats directly without normalization. If a non-zero named buffer object is bound to the GL_ARRAY_BUFFER target (see glBindBuffer ) while a generic vertex attribute array is specified, pointer is treated as a byte offset into the buffer object's data store. Also, the buffer object binding ( GL_ARRAY_BUFFER_BINDING ) is saved as generic vertex attribute array client-side state ( GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING ) for index index. When a generic vertex attribute array is specified, size, type, normalized, stride, and pointer are saved as client-side state, in addition to the current vertex array buffer object binding. To enable and disable a generic vertex attribute array, call glEnableVertexAttribArray and glDisableVertexAttribArray with index. If enabled, the generic vertex attribute array is used when glArrayElement, glDrawArrays, glMultiDrawArrays, glDrawElements, glMultiDrawElements, or glDrawRangeElements is called.

glVertexAttribPointer is available only if the GL version is 2.0 or greater. Each generic vertex attribute array is initially disabled and isn't accessed when glArrayElement, glDrawElements, glDrawRangeElements, glDrawArrays, glMultiDrawArrays, or glMultiDrawElements is called. Execution of glVertexAttribPointer is not allowed between the execution of glBegin and the corresponding execution of glEnd, but an error may or may not be generated. If no error is generated, the operation is undefined. glVertexAttribPointer is typically implemented on the client side. Generic vertex attribute array parameters are client-side state and are therefore not saved or restored by glPushAttrib and glPopAttrib. Use glPushClientAttrib and glPopClientAttrib instead.