Reply – Render using Vertex Array Object
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Render using Vertex Array Object
— by Frank_Stokes Frank_Stokes
Greetings everyone,

after successful indexed rendering from an interleaved (position/normal) vertex buffer, I've been trying to render using vertex array object.

My initialization method looks like this:
- request 1 Vertex Array handle from OpenGL (glGenVertexArrays)
- bind the obtained handle:  glBindVertexArray(vaoHandle)
 -- request 2 buffer handles from OpenGL (glGenBuffers)
 -- bind 1st buffer handle as array buffer:  glBindBuffer(GL_ARRAY_BUFFER,vboHandle)
 --- enable 3 vertex attribute arrays (0,1,2)
 --- bind interleaved buffer data (glBufferData)
 ---- set position pointer: glVertexAttribPointer(0, 3, GL_FLOAT, false, 24, 0)
 ---- set normal pointer:  glVertexAttribPointer(1, 3, GL_FLOAT, false, 24,12)
 -- bind 2nd buffer handle as element array buffer: glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, iboHandle)
 ---- bind index buffer data (glBufferData)
 ---- set index pointer: glVertexAttribPointer(2, 1, GL_UNSIGNED_INT, false, 0,0)
--- disable 3 vertex attribute arrays (2,1,0)

Render attempt, using VAO, looks like this:
- bind vao: glBindVertexArray(vaoHandle)
- enable 3 vertex attribute arrays (0,1,2)
-- make a draw call: glDrawElements(GL_TRIANGLES, triangleCount, GL_UNSIGNED_INT,0)
- disable 3 vertex attribute arrays (2,1,0)
- bind default vertex array: glBindVertexArray(0)

Note: In my successful rendering routine I rely on glEnable/DisableClientState, glVertexPointer & glNormalPointer, after binding the buffers.

I would appreciate any, and all, feedback and suggestions.

P.S. I apologize for lack of formatting.