Combining glVertexPointer and glVertexAttribPointer gives problems

Question

I had a problem when first rendering a vertex buffer with a program, and then rendering another vertexbuffer without a program.

for the first buffer, when the program is on, I use code similar to:

glBindBuffer( GL_ARRAY_BUFFER, m_id ); GLint location = glGetAttribLocation( pID, "position" ); glEnableVertexAttribArray( location ); glVertexAttribPointer( location, 3, GL_FLOAT, GL_FALSE, 3 * sizeof( GLfloat ), 0 ); glDrawArrays( m_mode, 0, m_numVertices ); 

for the second, without a program:

 glBindBuffer( GL_ARRAY_BUFFER, m_id ); glEnableClientState( GL_VERTEX_ARRAY ); glVertexPointer( 3, GL_FLOAT, 3 * sizeof( GLfloat ), 0 ); glDrawArrays( m_mode, 0, m_numVertices ); 

both encodings work fine individually, but when they are executed in the order "with the program" → "without the program", the second one seems to use the buffer of the first, and in the order "without the program" → "with the program" the first is not drawn (in the second iteration) .

now this tells me that i am missing any state change executed by the glEnableVertexAttribArray block, but I don’t understand which state change is causing the problems.

ps the reason why I am rendering with and without the program is that in lib im script mode you can enable or disable programs for node.

Answer 1

Try to add

 glDisableVertexAttribArray( location ); // location of "position" 

before switching to rendering a fixed function.