Re: [PyOpenGL-Users] New user trying tutorial

[Nicolas P. R. <Nic...@in...>]

Here is another tutorial: http://www.loria.fr/~rougier/teaching/opengl/

One part (gloo) is linked to the vispy project (vispy.org) but I tried to give an overview of modern GL.


Nicolas


On 30 Aug 2014, at 22:10, Berlioz Silver <roc...@gm...> wrote:

> 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()
> 
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