BaseContext = testingcontext.getInteractive()
from OpenGL.GL import *
from OpenGL.arrays import vbo
from OpenGL.GL import shaders

class TextContext( BaseContext ):
    """ Creates a simple vertex shader ... """

def Oninit(self):
    VERTEX_SHADER = shaders.compileShader("""#version 120 
void main() {
     gl_position = gl_ModeViewProjectionMatrix * gl_Vertex;
 }""", GL_VERTEX_SHADER)

    FRAGMENT_SHADER = shaders.compileShader("""#version 120
void main() {
    gl_FragColor = vect4(0, 1, 0, 1 );
}""", GL_FRAMENT_SHADER)

self.shader = shaders.compileProgram(VERTEX_SHADER,FRAGMENT_SHADER)

self.vbo = vbo.VBO(
    array( [
        [ 0, 1, 0 ],
        [ -1, -1, 0 ],
        [ 1, -1, 0 ],
        [ 2, -1, 0 ],
        [ 4, -1, 0 ],
        [ 4, 1, 0 ],
        [ 2, -1, 0 ],
        [ 4, 1, 0 ],
        [ 2, 1, 0 ],
    ], 'f')
)

def Render(self, mode):
    """"Renders the geometry for the scene"""
    shaders.glUseProgram(self.shader)
    try:
        self.vbo.bind()
        try:
            glEnableClientState(GL_VERTEX_ARRAY)
            glVertexPointerf(self.vbo)
            glDrawArrays(GL_TRIANGLES,0,9)
        finally:
            self.vbo.unbind()
            glDisableClientState(GL_VERTEX_ARRAY)
    finally:
        shaders.glUseProgram(0)