def setupGL(self):
self.program = QOpenGLShaderProgram(self.context())
info("PROGRAM", self.program)
# addShaderFromSourceCode() only returns a bool telling whether everything went well
if self.program.addShaderFromSourceCode(QOpenGLShader.Vertex,
self.vertexShaderSource):
info("VERTEX SHADER",
"Managed to load and parse the vertex shader")
if self.program.addShaderFromSourceCode(QOpenGLShader.Fragment,
self.fragmentShaderSource):
info("FRAGMENT SHADER",
"Managed to load and parse the fragment shader")
# Compile and bind the shader program to the current context
self.program.link()
self.program.bind()
# Tell GL that whenever we run glClear, this is the color that
# should be used. We only need to do this once.
self.gl.glClearColor(0.1, 0.1, 0.1, 1.0)
self.dumpGLLogMessages("setupGL()")
def setupGL(self):
self.program = QOpenGLShaderProgram(self.context())
info("PROGRAM", self.program)
# addShaderFromSourceCode() only returns a bool telling whether everything went well
if self.program.addShaderFromSourceCode(QOpenGLShader.Vertex,
self.vertexShaderSource):
info("VERTEX SHADER",
"Managed to load and parse the vertex shader")
if self.program.addShaderFromSourceCode(QOpenGLShader.Fragment,
self.fragmentShaderSource):
info("FRAGMENT SHADER",
"Managed to load and parse the fragment shader")
# Compile and bind the shader program to the current context
self.program.link()
self.program.bind()
# Bind the shader attribute to a python variable
self.somePosition = self.gl.glGetAttribLocation(
self.program.programId(), "somePosition")
# Use array rather than list in order to get control over actual data size
self.vertices = array.array(
'f',
[-0.5, -0.5, 0.0, 0.5, 0.5, 0.0, 0.5, -0.5, 0.0, 0.0, 0.0, 0.0])
# Buffer info returns a tuple where the second part is number of elements in the array
self.verticesLength = self.vertices.buffer_info()[1]
# Size in bytes for each element
self.verticesItemSize = self.vertices.itemsize
# Total size in bytes for entire array
self.verticesDataLength = self.verticesLength * self.verticesItemSize
# Number of vertices in the array
self.numberOfVertices = int(self.verticesLength / 3)
# Tell gl to prepare a buffer
self.vertexBuffer = self.gl.glGenBuffers(1)
# Say that the buffer is of type GL_ARRAY_BUFFER
self.gl.glBindBuffer(self.gl.GL_ARRAY_BUFFER, self.vertexBuffer)
# Copy data into the buffer
self.gl.glBufferData(self.gl.GL_ARRAY_BUFFER, self.verticesDataLength,
self.vertices.tobytes(), self.gl.GL_STATIC_DRAW)
# Say that the somePosition attribute should be read from the current array, that it should take three values at a
# time (x, y, z), and that they are of the type GL_FLOAT
self.gl.glVertexAttribPointer(self.somePosition, 3, self.gl.GL_FLOAT,
False, 0, 0)
# When reading from the current data, start at position 0
self.gl.glEnableVertexAttribArray(0)
# Tell GL that whenever we run glClear, this is the color that
# should be used. We only need to do this once.
self.gl.glClearColor(0.1, 0.1, 0.1, 1.0)
self.dumpGLLogMessages("setupGL()")
def setupGL(self):
self.program = QOpenGLShaderProgram(self.context())
info("PROGRAM", self.program)
# addShaderFromSourceCode() only returns a bool telling whether everything went well
if self.program.addShaderFromSourceCode(QOpenGLShader.Vertex,
self.vertexShaderSource):
info("VERTEX SHADER",
"Managed to load and parse the vertex shader")
if self.program.addShaderFromSourceCode(QOpenGLShader.Fragment,
self.fragmentShaderSource):
info("FRAGMENT SHADER",
"Managed to load and parse the fragment shader")
# Compile and bind the shader program to the current context
self.program.link()
self.program.bind()
# Find the uniform location for controling the viewport scale of the vertex positions
self.viewportScaling = self.program.uniformLocation("viewportScaling")
# Find the uniform location for controling the rotation of the object
self.objectRotation = self.program.uniformLocation("objectRotation")
# Find light setting uniforms
self.diffuseStrengthUniform = self.program.uniformLocation(
"diffuseStrength")
self.ambientStrengthUniform = self.program.uniformLocation(
"ambientStrength")
self.specularStrengthUniform = self.program.uniformLocation(
"specularStrength")
self.specularHardnessUniform = self.program.uniformLocation(
"specularHardness")
# This returns a numpy array with the shape [ [XYZNNN] [XYZNNN] ... ]
self.vertices2d = self.suzanne.getVertexAndNormalArray()
# ... so we need to flatten it to an 1d array
self.vertices = self.suzanne.getVertexAndNormalArray().flatten()
# Number of elements in the flattened array
self.verticesLength = self.vertices.size
# Each vertex is specified with with six values (xyznnn)
self.arrayCellsPerVertex = 6
# Size in bytes for each vertex specification (self.vertices.itemsize is the size in bytes
# of a single array cell)
self.vertexSpecificationSize = self.vertices.itemsize * self.arrayCellsPerVertex
# In bytes, where in a vertex specification does the normal data start? (it starts after
# x, y, z.. i.e after 3 array cells)
self.normalBytesOffset = self.vertices.itemsize * 3
# How many bytes are there in between vertex location specifications
self.vertexStride = self.vertices.itemsize * self.arrayCellsPerVertex
# What GL datatype should we tell the buffer that we're using? This is necessary, since it
# might be different on 32-bit and 64-bit machines
self.glDataType = None # let it crash if it isn't float or double
if self.vertices.itemsize == 4:
self.glDataType = self.gl.GL_FLOAT
if self.vertices.itemsize == 8:
self.glDataType = self.gl.GL_DOUBLE
# Total size in bytes for entire array
self.verticesDataLength = self.vertices.nbytes
# 2d Array with vertex indices that make up faces
self.indices2d = self.suzanne.getFaceArray()
# Flattened version suitable for drawElements
self.indices = self.indices2d.flatten().tolist()
# Number of elements in the index array.
self.numberOfVertices = self.indices2d.size
# Start specifying the Vertex Array Object (VAO).
self.suzanneVAO = QOpenGLVertexArrayObject()
self.suzanneVAO.create()
self.suzanneVAO.bind()
# Create a VBO for holding vertex info (both positions and normals)
self.verticesBuffer = QOpenGLBuffer(QOpenGLBuffer.VertexBuffer)
self.verticesBuffer.create()
self.verticesBuffer.bind()
self.verticesBuffer.setUsagePattern(QOpenGLBuffer.StaticDraw)
self.verticesBuffer.allocate(self.vertices.tobytes(),
self.verticesDataLength)
# Here we specify that there is a program attribute that should get data that is sent
# to it (by glDraw* operations), and in what form the data will arrive.
self.program.enableAttributeArray(
self.program.attributeLocation("somePosition"))
self.program.setAttributeBuffer(
self.program.attributeLocation("somePosition"), self.glDataType, 0,
3, self.vertexStride)
# Say that the inputNormal attribute should be read from the same array, that it should take three values at a
# time (the normal vector), and that they are of type GL_FLOAT. The same byte offset as for the position info is used, but
# we now also specify that the normal information starts at normalBytesOffset bytes into each vertex specification
self.program.enableAttributeArray(
self.program.attributeLocation("inputNormal"))
self.program.setAttributeBuffer(
self.program.attributeLocation("inputNormal"), self.glDataType,
self.normalBytesOffset, 3, self.vertexStride)
# Once we have set up everything related to the VBOs, we can release that and the
# related VAO.
self.verticesBuffer.release()
self.suzanneVAO.release()
# Release the program until we need to actually draw something.
self.program.release()
self.gl.glClearColor(0.1, 0.1, 0.1, 1.0)
self.dumpGLLogMessages("setupGL()")
def setupGL(self):
self.program = QOpenGLShaderProgram(self.context())
info("PROGRAM", self.program)
# addShaderFromSourceCode() only returns a bool telling whether everything went well
if self.program.addShaderFromSourceCode(QOpenGLShader.Vertex,
self.vertexShaderSource):
info("VERTEX SHADER",
"Managed to load and parse the vertex shader")
if self.program.addShaderFromSourceCode(QOpenGLShader.Fragment,
self.fragmentShaderSource):
info("FRAGMENT SHADER",
"Managed to load and parse the fragment shader")
# Compile and bind the shader program to the current context
self.program.link()
self.program.bind()
# Bind the shader attribute for transfering vertex positions to a python variable
self.somePosition = self.gl.glGetAttribLocation(
self.program.programId(), "somePosition")
# Bind the shader attribute for transfering vertex colors to a python variable
self.inputColor = self.gl.glGetAttribLocation(self.program.programId(),
"inputColor")
# Bind the shader "uniform" for controling the viewport scale of the vertex positions
self.viewportScaling = self.gl.glGetUniformLocation(
self.program.programId(), "viewportScaling")
# Bind the shader "uniform" for controling the rotation of the object
self.objectRotation = self.gl.glGetUniformLocation(
self.program.programId(), "objectRotation")
# Here we mix vertex data (x, y, z) with color data (r, g, b, a).
self.vertices = array.array(
'f',
[
-0.5,
-0.5,
0.0,
1.0,
0.0,
0.0,
1.0, # Bottom left is red
-0.5,
0.5,
0.0,
0.0,
1.0,
0.0,
1.0, # Top left is green
0.5,
0.5,
0.0,
0.0,
0.0,
1.0,
1.0, # Top right is blue
0.5,
-0.5,
0.0,
1.0,
1.0,
0.0,
1.0 # Bottom right is yellow
])
# Buffer info returns a tuple where the second part is number of elements in the array
self.verticesLength = self.vertices.buffer_info()[1]
# Each vertex is specified with with seven values (xyzrgba)
self.arrayCellsPerVertex = 7
# Size in bytes for each vertex specification (self.vertices.itemsize is the size in bytes
# of a single array cell)
self.vertexSpecificationSize = self.vertices.itemsize * self.arrayCellsPerVertex
# In bytes, where in a vertex specification does the color data start? (it starts after
# x, y, z.. i.e after 3 array cells)
self.colorBytesOffset = self.vertices.itemsize * 3
# Total size in bytes for entire array
self.verticesDataLength = self.verticesLength * self.vertices.itemsize
# Number of vertices in the array
self.numberOfVertices = int(self.verticesLength /
self.arrayCellsPerVertex)
# Tell gl to prepare a single buffer
self.vertexBuffer = self.gl.glGenBuffers(1)
# Say that the buffer is of type GL_ARRAY_BUFFER
self.gl.glBindBuffer(self.gl.GL_ARRAY_BUFFER, self.vertexBuffer)
# Copy data into the buffer
self.gl.glBufferData(self.gl.GL_ARRAY_BUFFER, self.verticesDataLength,
self.vertices.tobytes(), self.gl.GL_STATIC_DRAW)
# Say that the somePosition attribute should be read from the current array, that it should take three values at a
# time (x, y, z), and that they are of the type GL_FLOAT. We now also specify a byte offset (vertexSpecificationSize)
# to say that each new vertex specification is starting this many bytes after the prior one.
self.gl.glVertexAttribPointer(self.somePosition, 3, self.gl.GL_FLOAT,
False, self.vertexSpecificationSize, 0)
# Connect the array to the somePosition variable
self.gl.glEnableVertexAttribArray(self.somePosition)
# Say that the inputColor attribute should be read from the current array, that it should take four values at a
# time (r, g, b, a), and that they are of type GL_FLOAT. The same byte offset as for the position info is used, but
# we now also specify that the color information starts at colorBytesOffset bytes into each vertex specification
self.gl.glVertexAttribPointer(self.inputColor, 4, self.gl.GL_FLOAT,
False, self.vertexSpecificationSize,
self.colorBytesOffset)
# Connect the array to the inputColor variable
self.gl.glEnableVertexAttribArray(self.inputColor)
# Tell GL that whenever we run glClear, this is the color that
# should be used. We only need to do this once.
self.gl.glClearColor(0.1, 0.1, 0.1, 1.0)
self.dumpGLLogMessages("setupGL()")
def sizeHint(self):
info("TESTCANVAS", "using overridden sizeHint()")
return QSize(600, 600)
def setupGL(self):
self.program = QOpenGLShaderProgram(self.context())
info("PROGRAM", self.program)
# addShaderFromSourceCode() only returns a bool telling whether everything went well
if self.program.addShaderFromSourceCode(QOpenGLShader.Vertex,
self.vertexShaderSource):
info("VERTEX SHADER",
"Managed to load and parse the vertex shader")
if self.program.addShaderFromSourceCode(QOpenGLShader.Fragment,
self.fragmentShaderSource):
info("FRAGMENT SHADER",
"Managed to load and parse the fragment shader")
# Compile and bind the shader program to the current context
self.program.link()
self.program.bind()
# Find the uniform location for controling the viewport scale of the vertex positions
self.viewportScaling = self.program.uniformLocation("viewportScaling")
# Find the uniform location for controling the rotation of the object
self.objectRotation = self.program.uniformLocation("objectRotation")
# Use arrays to specify two different triangles.
self.vertices1 = array.array(
'f', [-0.5, -0.5, 0.0, 0.5, 0.5, 0.0, 0.5, -0.5, 0.0])
self.vertices2 = array.array(
'f', [-0.8, 0.8, 0.0, -0.1, 0.8, 0.0, -0.8, 0.1, 0.0])
# We'll take a shortcut here and use the same size/length for both objects. In reality
# the following calculations should be done for each vertex array.
# Buffer info returns a tuple where the second part is number of elements in the array
self.verticesLength = self.vertices1.buffer_info()[1]
# Size in bytes for each element
self.verticesItemSize = self.vertices1.itemsize
# Total size in bytes for entire array
self.verticesDataLength = self.verticesLength * self.verticesItemSize
# Number of vertices in the array
self.numberOfVertices = int(self.verticesLength / 3)
# Start specifying the first Vertex Array Object (VAO). The upside of this approach
# is that we can keep all settings pertaining to the Vertex Buffer Object (VBO) specified
# here and not have to specify them again at draw time. This will make it a lot easier
# to keep multiple conceptual graphical objects around.
#
# The VAO will remember all that was specified for its VBOs between the VAOs bind() and
# its close()
self.triangleVAO1 = QOpenGLVertexArrayObject()
self.triangleVAO1.create()
self.triangleVAO1.bind()
# Instead of asking GL directly to allocate an array buffer, we ask QT
# to set up one for us. In GL language we are creating a "VBO" here.
self.verticesBuffer1 = QOpenGLBuffer()
self.verticesBuffer1.create()
self.verticesBuffer1.bind()
self.verticesBuffer1.setUsagePattern(QOpenGLBuffer.StaticDraw)
self.verticesBuffer1.allocate(self.vertices1.tobytes(),
self.verticesDataLength)
# Here we specify that there is a program attribute that should get data that is sent
# to it (by glDraw* operations), and in what form the data will arrive.
self.program.enableAttributeArray(
self.program.attributeLocation("somePosition"))
self.program.setAttributeBuffer(
self.program.attributeLocation("somePosition"), self.gl.GL_FLOAT,
0, 3, 0)
# Once we have set up everything related to the VBO, we can release that and the
# related VAO.
self.verticesBuffer1.release()
self.triangleVAO1.release()
# Start specifying the second VAO
self.triangleVAO2 = QOpenGLVertexArrayObject()
self.triangleVAO2.create()
self.triangleVAO2.bind()
# Create the second VBO
self.verticesBuffer2 = QOpenGLBuffer()
self.verticesBuffer2.create()
self.verticesBuffer2.bind()
self.verticesBuffer2.setUsagePattern(QOpenGLBuffer.StaticDraw)
self.verticesBuffer2.allocate(self.vertices2.tobytes(),
self.verticesDataLength)
# Specify location of vertex attribute in the shader.
self.program.enableAttributeArray(
self.program.attributeLocation("somePosition"))
self.program.setAttributeBuffer(
self.program.attributeLocation("somePosition"), self.gl.GL_FLOAT,
0, 3, 0)
# Release the second VAO and VBO
self.verticesBuffer2.release()
self.triangleVAO2.release()
# Release the program until we need to actually draw something.
self.program.release()
self.gl.glClearColor(0.1, 0.1, 0.1, 1.0)
self.dumpGLLogMessages("setupGL()")
def setupGL(self):
self.program = QOpenGLShaderProgram(self.context())
info("PROGRAM",self.program)
# addShaderFromSourceCode() only returns a bool telling whether everything went well
if self.program.addShaderFromSourceCode(QOpenGLShader.Vertex, self.vertexShaderSource):
info("VERTEX SHADER","Managed to load and parse the vertex shader")
if self.program.addShaderFromSourceCode(QOpenGLShader.Fragment, self.fragmentShaderSource):
info("FRAGMENT SHADER","Managed to load and parse the fragment shader")
# Compile and bind the shader program to the current context
self.program.link()
self.program.bind()
# Find the uniform location for controling the viewport scale of the vertex positions
self.viewportScaling = self.program.uniformLocation("viewportScaling")
# Find the uniform location for controling the rotation of the object
self.objectRotation = self.program.uniformLocation("objectRotation")
# Location and color for vertices. We specity vertices independently of
# faces, so it does not matter in which order they occur.
self.vertices = array.array('f', [
-0.5,-0.5,-0.5, 1.0, 0.0, 0.0, 1.0, # Front bottom left is red
-0.5, 0.5,-0.5, 0.0, 1.0, 0.0, 1.0, # Front top left is green
0.5, 0.5,-0.5, 0.0, 0.0, 1.0, 1.0, # Front top right is blue
0.5,-0.5,-0.5, 1.0, 1.0, 0.0, 1.0, # Front bottom right is yellow
-0.5,-0.5, 0.5, 0.0, 1.0, 1.0, 1.0, # Back bottom left is cyan
-0.5, 0.5, 0.5, 1.0, 1.0, 1.0, 1.0, # Back top left is white
0.5, 0.5, 0.5, 1.0, 0.0, 1.0, 1.0, # Back top right is purple
0.5,-0.5, 0.5, 0.5, 0.5, 0.5, 1.0 # Back bottom right is gray
])
# Buffer info returns a tuple where the second part is number of elements in the array
self.verticesLength = self.vertices.buffer_info()[1]
# Each vertex is specified with with seven values (xyzrgba)
self.arrayCellsPerVertex = 7
# Size in bytes for each vertex specification (self.vertices.itemsize is the size in bytes
# of a single array cell)
self.vertexSpecificationSize = self.vertices.itemsize * self.arrayCellsPerVertex
# In bytes, where in a vertex specification does the color data start? (it starts after
# x, y, z.. i.e after 3 array cells)
self.colorBytesOffset = self.vertices.itemsize * 3
# How many bytes are there in between vertex location specifications
self.vertexStride = self.vertices.itemsize * 7 # (7 because XYZRGBA)
# Total size in bytes for entire array
self.verticesDataLength = self.verticesLength * self.vertices.itemsize
# Create an array with unsigned short values for specifying each face
# of the cube
self.indices = array.array('H', [
0, 1, 2, 3, # Front face
4, 5, 6, 7, # Back face
1, 0, 4, 5, # Left face
2, 3, 7, 6, # Right face
1, 2, 6, 5, # Top face
0, 3, 7, 4 # Bottom face
])
# Number of vertices in the index array. Note that this is different
# from the number of vertices in the *vertex* array (which are 8 in
# total). In the *index* array, each vertex can be counted multiple
# times. So for 6 faces with 4 vertices each, we have 24 vertices
# specified by their indexes.
self.numberOfVertices = self.indices.buffer_info()[1]
# Start specifying the Vertex Array Object (VAO).
self.cubeVAO = QOpenGLVertexArrayObject()
self.cubeVAO.create()
self.cubeVAO.bind()
# Create a VBO for holding vertex position info
self.verticesBuffer = QOpenGLBuffer(QOpenGLBuffer.VertexBuffer)
self.verticesBuffer.create()
self.verticesBuffer.bind()
self.verticesBuffer.setUsagePattern(QOpenGLBuffer.StaticDraw)
self.verticesBuffer.allocate(self.vertices.tobytes(), self.verticesDataLength)
# Here we specify that there is a program attribute that should get data that is sent
# to it (by glDraw* operations), and in what form the data will arrive.
self.program.enableAttributeArray( self.program.attributeLocation("somePosition") )
self.program.setAttributeBuffer( self.program.attributeLocation("somePosition"), self.gl.GL_FLOAT, 0, 3, self.vertexStride )
# Say that the inputColor attribute should be read from the same array, that it should take four values at a
# time (r, g, b, a), and that they are of type GL_FLOAT. The same byte offset as for the position info is used, but
# we now also specify that the color information starts at colorBytesOffset bytes into each vertex specification
self.program.enableAttributeArray( self.program.attributeLocation("inputColor") )
self.program.setAttributeBuffer( self.program.attributeLocation("inputColor"), self.gl.GL_FLOAT, self.colorBytesOffset, 4, self.vertexStride )
# Once we have set up everything related to the VBOs, we can release that and the
# related VAO.
self.verticesBuffer.release()
self.cubeVAO.release()
# Release the program until we need to actually draw something.
self.program.release()
self.gl.glClearColor(0.1, 0.1, 0.1, 1.0)
self.dumpGLLogMessages("setupGL()")
