glVertexAttribPointer

glVertexAttribPointer: man3/glVertexAttribPointer.xml

glVertexAttribPointer and glVertexAttribIPointer specify 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, 4, or GL_BGRA. 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. For glVertexAttribPointer, if normalized is set to GL_TRUE, it 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. For glVertexAttribIPointer, only the integer types GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_INT, GL_UNSIGNED_INT are accepted. Values are always left as integer values. If pointer is not null, a non-zero named buffer object must be bound to the GL_ARRAY_BUFFER target (see glBindBuffer ), otherwise an error is generated. pointer is treated as a byte offset into the buffer object's data store. The buffer object binding ( GL_ARRAY_BUFFER_BINDING ) is saved as generic vertex attribute array 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 vertex array 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 glDrawArrays, glMultiDrawArrays, glDrawElements, glMultiDrawElements, or glDrawRangeElements is called.

Each generic vertex attribute array is initially disabled and isn't accessed when glDrawElements, glDrawRangeElements, glDrawArrays, glMultiDrawArrays, or glMultiDrawElements is called. glVertexAttribIPointer is available only if the GL version is 3.0 or higher.