Re: [PyOpenGL-Users] New user trying tutorial

[Berlioz S. <roc...@gm...>]

Sorry, just figured it out.

I'd still like to know if there are other good tutorials though.


On Sat, Aug 30, 2014 at 1:07 PM, Berlioz Silver <roc...@gm...> wrote:

> I've been interested in attempting to use pyopengl and pygame together to
> display 3D images and accelerate my programs.
>
> I figured a logical first step would be to learn a bit about pyopengl, so
> I tried the tutorial.
>
> I successfully installed pyopengl on OSX 10.9, and ran the first tutorial.
>
> However, the second (introducing color variations
> http://pyopengl.sourceforge.net/context/tutorials/shader_2.html) fails
> with a bus error 10.
>
> Is there another tutorial I should follow/what mistake did I make that is
> giving me a segfault?
>
> Here is my code:
>
>
>
> from OpenGLContext import testingcontext
> BaseContext = testingcontext.getInteractive()
> from OpenGL.GL import *
> from OpenGL.arrays import vbo
> from OpenGL.GL import shaders
>
> import numpy as np
>
>
> class TestContext(BaseContext):
> def OnInit(self):
> try:
> VERTEX_SHADER = shaders.compileShader("""
>                     varying vec4 vertex_color;
>                     void main(){
>                      gl_Position = gl_ModelViewProjectionMatrix *
> gl_Vertex;
>                      vertex_color = gl_Color;
>                     }""", GL_VERTEX_SHADER)
>  FRAGMENT_SHADER = shaders.compileShader("""
>                 varying vec4 vertex_color;
>                     void main(){
>                      gl_FragColor = vertex_color;
>                     }""", GL_FRAGMENT_SHADER)
> self.shader = shaders.compileProgram(VERTEX_SHADER, FRAGMENT_SHADER)
>  except (GLError, RuntimeError) as err:
> print "Shader compilation error:", err
> raise
>  self.vbo = vbo.VBO(np.array([
>                    [ 0, 1, 0, 0,1,0 ],
>                    [-1,-1, 0, 1,1,0 ],
>                    [ 1,-1, 0, 0,1,1 ],
>                    [ 2,-1, 0, 1,0,0 ],
>                    [ 4,-1, 0, 0,1,0 ],
>                    [ 4, 1, 0, 0,0,1 ],
>                    [ 2,-1, 0, 1,0,0 ],
>                    [ 4, 1, 0, 0,0,1 ],
>                    [ 2, 1, 0, 0,1,1 ],
>                    ],'f') )
> def Render(self, mode):
>  glUseProgram(self.shader)
> try:
> self.vbo.bind()
>  try:
> glEnableClientState(GL_VERTEX_ARRAY)
> glEnableClientState(GL_COLOR_ARRAY)
>  #glVertexPointerf(self.vbo)
> glColorPointer(3, GL_INT, 24, self.vbo+12)
> glDrawArrays(GL_TRIANGLES, 0, 9)
>  finally:
> self.vbo.unbind()
> glDisableClientState(GL_VERTEX_ARRAY)
>  glDisableClientState(GL_COLOR_ARRAY)
> finally:
> shaders.glUseProgram(0)
>
> if __name__ == "__main__":
> TestContext.ContextMainLoop()
>