I've setup a qt widget that serves as an opengl viewer. My goal is to use it as a texture viewer and as a model viewer as well. That's why i've created two different programs, with different shaders attached to them to fit my needs.
I'm storing all the objects in a custom class that i made, which also stores the correct object program id.
In the paintGL function of the QGLWidget i'm doing all the job that needs to be done in order to draw the scene.
The problem is that while the models work, when i'm trying to simply switch the programs and draw a simple quad, the window crashes, and i get no error in the console of what happened. By adding printing statements, i've located that the gldrawElements function is causing the crash, but i can't find out why.
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
for ob in self.objects:
activeBuffers = []
# GL.glLinkProgram(ob.program)
GL.glLinkProgram(ob.program)
GL.glUseProgram(ob.program)
# print ob.vBuffer, ob.uvBuffer, ob.nBuffer, ob.iBuffer
if ob.program == self.programs[0]:
# Update Panning
loc = GL.glGetUniformLocation(ob.program, "panX")
GL.glUniform1f(loc, self.panX)
loc = GL.glGetUniformLocation(ob.program, "panY")
GL.glUniform1f(loc, self.panY)
# Update Scale in Shader
loc = GL.glGetUniformLocation(ob.program, "scale")
GL.glUniform1f(loc, self.scale)
# Update Theta in Shader
loc = GL.glGetUniformLocation(ob.program, "theta")
GL.glUniform3fv(loc, 1, self.theta)
# Bind Vertex VBO
ob.vBuffer.bind()
vpos = GL.glGetAttribLocation(ob.program, "vPosition")
GL.glVertexAttribPointer(
vpos, 3, GL.GL_FLOAT, GL.GL_FALSE, 0, None)
GL.glEnableVertexAttribArray(vpos)
if ob.uvBuffer:
# Bind UVs
ob.uvBuffer.bind()
uvpos = GL.glGetAttribLocation(ob.program, "uvPosition")
print ob.program, uvpos
if not uvpos == -1:
GL.glVertexAttribPointer(uvpos, 2, GL.GL_FLOAT, GL.GL_FALSE, 0, None)
GL.glEnableVertexAttribArray(uvpos)
activeBuffers.append(ob.uvBuffer)
else:
ob.uvBuffer.unbind()
if ob.nBuffer:
# Bind Normals
ob.nBuffer.bind()
npos = GL.glGetAttribLocation(ob.program, "nPosition")
GL.glVertexAttribPointer(npos, 3, GL.GL_FLOAT, GL.GL_FALSE, 0, None)
GL.glEnableVertexAttribArray(npos)
activeBuffers.append(ob.nBuffer)
# Bind Indices VBO
ob.iBuffer.bind()
activeBuffers.append(ob.iBuffer)
# if ob.program == self.programs[1]:
# print 'Continuing'
# continue
GL.glDrawElements(
GL.GL_TRIANGLES, ob.iLen, GL.GL_UNSIGNED_INT, None)
# Unbind everything
for buf in activeBuffers:
buf.unbind()
I'm creating the objects like that
def makeTextureQuad(self):
ob = globject()
ob.vBuffer = np.array(quadverts, dtype=np.float32)
ob.vBuffer = glvbo.VBO(ob.vBuffer)
ob.vLen = len(quadverts)
ob.iBuffer = np.array(quadfaces, dtype=np.int32)
ob.iBuffer = glvbo.VBO(ob.iBuffer, target=GL.GL_ELEMENT_ARRAY_BUFFER)
ob.iLen = len(quadfaces) * 3
ob.uvBuffer = np.array(quaduvs, dtype=np.float32)
ob.uvBuffer = glvbo.VBO(ob.uvBuffer)
# ob.nBuffer = np.array(quadnorms, dtype=np.float32)
# ob.nBuffer = glvbo.VBO(ob.nBuffer)
ob.program = self.programs[1]
return ob
Thanks in advance
