[PyOpenGL-Users] using glGetUniformLocation

[Ben De L. <bd...@gm...>]

I have this simple test program distilled from a more complex code
base, I am using glGetUniformLocation incorrectly but I am not sure
what the correct syntax is.

Any hits are appreciated!

from OpenGL import GL
from OpenGL import GLU
from OpenGL import GLUT
import sys
simpleShader = '''
#version 140
uniform int test;

void main()
{ ;
}
'''
def init():
   # select clearing color
   GL.glClearColor (0.0, 0.0, 0.0, 0.0)

   # initialize viewing values
   GL.glMatrixMode(GL.GL_PROJECTION)
   GL.glLoadIdentity()
   GL.glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0)
   shader = GL.glCreateShader(GL.GL_VERTEX_SHADER)
   GL.glShaderSource(shader, simpleShader)
   GL.glCompileShader(shader)
   print GL.glGetShaderInfoLog(shader)

   program = GL.glCreateProgram()
   GL.glAttachShader(program, shader)
   GL.glLinkProgram(program)

   loc = GL.glGetUniformLocation(program, "test")
   print loc


def display():
    GL.glClear (GL.GL_COLOR_BUFFER_BIT)
    GL.glColor3f (1.0, 1.0, 1.0)
    GL.glBegin(GL.GL_POLYGON)
    GL.glVertex3f (0.25, 0.25, 0.0)
    GL.glVertex3f (0.75, 0.25, 0.0)
    GL.glVertex3f (0.75, 0.75, 0.0)
    GL.glVertex3f (0.25, 0.75, 0.0)
    GL.glEnd()
    GL.glFlush ();



GLUT.glutInit(sys.argv)
GLUT.glutInitDisplayMode(GLUT.GLUT_SINGLE | GLUT.GLUT_RGB)
GLUT.glutInitWindowSize(250, 250)
GLUT.glutInitWindowPosition(100, 100)
GLUT.glutCreateWindow("hello")
init()
GLUT.glutDisplayFunc(display)
GLUT.glutMainLoop()