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POPyOpenGL - A tutorial about shaders that doesn't work
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  1. POPyOpenGL - A tutorial about shaders that doesn't work
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    copied!<p>This is an example from: <a href="http://pyopengl.sourceforge.net/context/tutorials/shader_1.xhtml" rel="nofollow noreferrer">http://pyopengl.sourceforge.net/context/tutorials/shader_1.xhtml</a></p> <p>It is creating a vbo, binging it, and running it with a shader, but somewhere along the way, it is not working properly. I searched a lot on the internet and didn't find any precise answers for my problem (the best pick I had was on this topic on StackOverflow : <a href="https://stackoverflow.com/questions/16945500/why-is-this-tutorial-example-of-a-shader-not-displaying-any-geometry-as-it-is-su">Why is this tutorial example of a shader not displaying any geometry as it is supposed to?</a> but even if the author was working on the same tutorial, he didn't have the same problem and solved it by himself...)</p> <pre><code>from OpenGLContext import testingcontext BaseContext = testingcontext.getInteractive() from OpenGL.GL import * from OpenGL.arrays import vbo from OpenGLContext.arrays import * from OpenGL.GL import shaders class TestContext( BaseContext ): def OnInit( self ): VERTEX_SHADER = shaders.compileShader("""#version 330 void main() { gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; }""", GL_VERTEX_SHADER) FRAGMENT_SHADER = shaders.compileShader("""#version 330 void main() { gl_FragColor = vec4( 0, 3, 6, 1 ); }""", GL_FRAGMENT_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): 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) if __name__ == "__main__": TestContext.ContextMainLoop() </code></pre> <p>Running this program from the windows command-line give me that error:</p> <pre><code>Traceback(most recent call last): File "openGL-test.py', line 70, in &lt;module&gt; TestContext.ContextMainLoop() File "C:\Python27\lib\site-package\openglcontext-2.2.0a2-py2.7.egg\OpenGLContext\glutcontext.py", line 159, in ContextMainLoop render = cls( *args, **named) File "C:\Python27\lib\site-package\openglcontext-2.2.0a2-py2.7.egg\OpenGLContext\glutcontext.py", line 35, in __init__ glutInitDisplayMode( self.DISPLAYMODE ) File "C:\Python27\lib\site-package\OpenGL\platform\baseplatform.py", line 384, in __call__ self.__name__, self.__name__, OpenGL.error.NullFunctionError: Attempt to call an undefined function glutInitDisplayMode, check for bool(glutInitDisplayMode) before calling </code></pre> <p>Any idea of what that means ? I have to precise, I began to learn Python two months ago, so I'm pretty newbie, even if I had to work it a lot for my internship period. (ho, and that's my first question on StackOverflow :)</p>
 

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