Beispiel #1
0
def _prepare_vis():
    
    objects = []
    
    # --- program and shaders
    
    # Create program and shaders
    hprog = gl.glCreateProgram()
    hvert = gl.glCreateShader(gl.GL_VERTEX_SHADER)
    hfrag = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
    objects.append((gl.glDeleteProgram, hprog))
    objects.append((gl.glDeleteShader, hvert))
    objects.append((gl.glDeleteShader, hfrag))
    
    # Compile source code
    gl.glShaderSource_compat(hvert, VERT)
    gl.glShaderSource_compat(hfrag, FRAG)
    gl.glCompileShader(hvert)
    gl.glCompileShader(hfrag)
    
    # Check
    assert_equal(gl.glGetShaderInfoLog(hvert), '')
    assert_equal(gl.glGetShaderInfoLog(hfrag), '')
    assert_equal(gl.glGetShaderParameter(hvert, gl.GL_COMPILE_STATUS), 1)
    assert_equal(gl.glGetShaderParameter(hfrag, gl.GL_COMPILE_STATUS), 1)
    
    # Attach and link
    gl.glAttachShader(hprog, hvert)
    gl.glAttachShader(hprog, hfrag)
    # touch glDetachShader
    gl.glDetachShader(hprog, hvert)
    gl.glAttachShader(hprog, hvert)
    gl.glLinkProgram(hprog)
    
    # Test that indeed these shaders are attached
    attached_shaders = gl.glGetAttachedShaders(hprog)
    assert_equal(set(attached_shaders), set([hvert, hfrag]))
    
    # Check
    assert_equal(gl.glGetProgramInfoLog(hprog), '')
    assert_equal(gl.glGetProgramParameter(hprog, gl.GL_LINK_STATUS), 1)
    gl.glValidateProgram(hprog)
    assert_equal(gl.glGetProgramParameter(hprog, gl.GL_VALIDATE_STATUS), 1)
    
    # Use it!
    gl.glUseProgram(hprog)
    
    # Bind one attribute
    gl.glBindAttribLocation(hprog, 1, 'a_2')
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # Check source
    vert_source = gl.glGetShaderSource(hvert)
    assert_true('attribute vec2 a_2;' in vert_source)
    
    # --- get information on attributes and uniforms
    
    # Count attribbutes and uniforms
    natt = gl.glGetProgramParameter(hprog, gl.GL_ACTIVE_ATTRIBUTES)
    nuni = gl.glGetProgramParameter(hprog, gl.GL_ACTIVE_UNIFORMS)
    assert_equal(natt, 4)
    assert_equal(nuni, 4+4+3+1)
    
    # Get names
    names = {}
    for i in range(natt):
        name, count, type = gl.glGetActiveAttrib(hprog, i)
        names[name] = type
        assert_equal(count, 1)
    for i in range(nuni):
        name, count, type = gl.glGetActiveUniform(hprog, i)
        names[name] = type
        assert_equal(count, 1)
    
    # Check
    assert_equal(names['a_1'], gl.GL_FLOAT)
    assert_equal(names['a_2'], gl.GL_FLOAT_VEC2)
    assert_equal(names['a_3'], gl.GL_FLOAT_VEC3)
    assert_equal(names['a_4'], gl.GL_FLOAT_VEC4)
    assert_equal(names['s_1'], gl.GL_SAMPLER_2D)
    #
    for i, type in enumerate([gl.GL_FLOAT, gl.GL_FLOAT_VEC2, 
                              gl.GL_FLOAT_VEC3, gl.GL_FLOAT_VEC4]):
        assert_equal(names['u_f%i' % (i+1)], type)
    for i, type in enumerate([gl.GL_INT, gl.GL_INT_VEC2, 
                              gl.GL_INT_VEC3, gl.GL_INT_VEC4]):
        assert_equal(names['u_i%i' % (i+1)], type)
    for i, type in enumerate([gl.GL_FLOAT_MAT2, gl.GL_FLOAT_MAT3, 
                              gl.GL_FLOAT_MAT4]):
        assert_equal(names['u_m%i' % (i+2)], type)
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- texture
    
    # Create, bind, activate
    htex = gl.glCreateTexture()
    objects.append((gl.glDeleteTexture, htex))
    gl.glPixelStorei(gl.GL_UNPACK_ALIGNMENT, 1)
    gl.glBindTexture(gl.GL_TEXTURE_2D, htex)
    
    # Allocate data and upload
    # This data is luminance and not C-contiguous
    gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_LUMINANCE, gl.GL_LUMINANCE, 
                    gl.GL_UNSIGNED_BYTE, im2)  # touch
    gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_LUMINANCE, gl.GL_LUMINANCE, 
                    gl.GL_UNSIGNED_BYTE, im2.shape[:2])
    gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, gl.GL_LUMINANCE,
                       gl.GL_UNSIGNED_BYTE, im2)
    
    # Set texture parameters (use f and i to touch both)
    T = gl.GL_TEXTURE_2D
    gl.glTexParameterf(T, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR)
    gl.glTexParameteri(T, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR)
    
    # Re-allocate data and upload 
    gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGB, gl.GL_RGB, 
                    gl.GL_UNSIGNED_BYTE, im1.shape[:2])
    gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, gl.GL_RGB,
                       gl.GL_UNSIGNED_BYTE, im1)
    
    # Attach!
    loc = gl.glGetUniformLocation(hprog, 's_1')
    unit = 0
    gl.glActiveTexture(gl.GL_TEXTURE0+unit)
    gl.glUniform1i(loc, unit) 
    
    # Mipmaps (just to touch this function)
    gl.glGenerateMipmap(gl.GL_TEXTURE_2D)
    
    # Check min filter (touch getTextParameter)
    minfilt = gl.glGetTexParameter(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER)
    assert_equal(minfilt, gl.GL_LINEAR)
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- buffer vec2 (contiguous VBO)
    
    # Create buffer
    hbuf2 = gl.glCreateBuffer()
    objects.append((gl.glDeleteBuffer, hbuf2))
    gl.glBindBuffer(gl.GL_ARRAY_BUFFER, hbuf2)

    # Allocate and set data
    gl.glBufferData(gl.GL_ARRAY_BUFFER, buf2.nbytes, gl.GL_DYNAMIC_DRAW)
    gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, buf2)
    
    # Attach!
    loc = gl.glGetAttribLocation(hprog, 'a_2')
    gl.glDisableVertexAttribArray(loc)  # touch
    gl.glEnableVertexAttribArray(loc)
    gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, 2*4, 0)
    
    # Check (touch glGetBufferParameter, glGetVertexAttrib and
    # glGetVertexAttribOffset)
    size = gl.glGetBufferParameter(gl.GL_ARRAY_BUFFER, gl.GL_BUFFER_SIZE)
    assert_equal(size, buf2.nbytes)
    stride = gl.glGetVertexAttrib(loc, gl.GL_VERTEX_ATTRIB_ARRAY_STRIDE)
    assert_equal(stride, 2*4)
    offset = gl.glGetVertexAttribOffset(loc, gl.GL_VERTEX_ATTRIB_ARRAY_POINTER)
    assert_equal(offset, 0)
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- buffer vec3 (non-contiguous VBO)
    
    # Create buffer
    hbuf3 = gl.glCreateBuffer()
    objects.append((gl.glDeleteBuffer, hbuf3))
    gl.glBindBuffer(gl.GL_ARRAY_BUFFER, hbuf3)

    # Allocate and set data
    gl.glBufferData(gl.GL_ARRAY_BUFFER, buf3.nbytes, gl.GL_DYNAMIC_DRAW)
    gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, buf3)
    
    # Attach!
    loc = gl.glGetAttribLocation(hprog, 'a_3')
    gl.glEnableVertexAttribArray(loc)
    gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, 3*4, 0)
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- buffer vec4 (client vertex data)
    
    # Select no FBO
    gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)
    
    # Attach!
    loc = gl.glGetAttribLocation(hprog, 'a_4')
    gl.glEnableVertexAttribArray(loc)
    gl.glVertexAttribPointer(loc, 4, gl.GL_FLOAT, False, 4*4, buf4)
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- element buffer
    
    # Create buffer
    global helements
    helements = gl.glCreateBuffer()
    objects.append((gl.glDeleteBuffer, helements))
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, helements)

    # Allocate and set data
    gl.glBufferData(gl.GL_ELEMENT_ARRAY_BUFFER, elements, gl.GL_DYNAMIC_DRAW)
    gl.glBufferSubData(gl.GL_ELEMENT_ARRAY_BUFFER, 0, elements)
    
    # Turn off
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, 0)
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- uniforms
    
    # Set integer uniforms to 0
    # We set them twice just to touch both i and iv functions
    for i, fun1, fun2 in [(1, gl.glUniform1i, gl.glUniform1iv),
                          (2, gl.glUniform2i, gl.glUniform2iv),
                          (3, gl.glUniform3i, gl.glUniform3iv),
                          (4, gl.glUniform4i, gl.glUniform4iv)]:
        name = 'u_i%i' % i
        value = [0] * i
        loc = gl.glGetUniformLocation(hprog, name)
        fun1(loc, *value)  # e.g. glUniform4i
        fun2(loc, 1, value)  # e.g. glUniform4iv

    # Set float uniforms to 1.0
    # We set them twice just to touch both i and iv functions
    for i, fun1, fun2 in [(1, gl.glUniform1f, gl.glUniform1fv),
                          (2, gl.glUniform2f, gl.glUniform2fv),
                          (3, gl.glUniform3f, gl.glUniform3fv),
                          (4, gl.glUniform4f, gl.glUniform4fv)]:
        name = 'u_f%i' % i
        value = [1.0] * i
        loc = gl.glGetUniformLocation(hprog, name)
        fun1(loc, *value)  # e.g. glUniform4f
        fun2(loc, 1, value)  # e.g. glUniform4fv
    
    # Set matrix uniforms
    m = np.eye(5, dtype='float32')
    loc = gl.glGetUniformLocation(hprog, 'u_m2')
    gl.glUniformMatrix2fv(loc, 1, False, m[:2, :2])
    #
    loc = gl.glGetUniformLocation(hprog, 'u_m3')
    m = np.eye(3, dtype='float32')
    gl.glUniformMatrix3fv(loc, 1, False, m[:3, :3])
    #
    loc = gl.glGetUniformLocation(hprog, 'u_m4')
    m = np.eye(4, dtype='float32')
    gl.glUniformMatrix4fv(loc, 1, False, m[:4, :4])
    
    # Check some uniforms
    loc = gl.glGetUniformLocation(hprog, 'u_i1')
    assert_equal(gl.glGetUniform(hprog, loc), 0)
    loc = gl.glGetUniformLocation(hprog, 'u_i2')
    assert_equal(gl.glGetUniform(hprog, loc), (0, 0))
    loc = gl.glGetUniformLocation(hprog, 'u_f2')
    assert_equal(gl.glGetUniform(hprog, loc), (1.0, 1.0))
    
    # Check if all is ok
    assert_equal(gl.glGetError(), 0)
    
    # --- attributes 
    
    # Constant values for attributes. We do not even use this ...
    loc = gl.glGetAttribLocation(hprog, 'a_1')
    gl.glVertexAttrib1f(loc, 1.0)
    loc = gl.glGetAttribLocation(hprog, 'a_2')
    gl.glVertexAttrib2f(loc, 1.0, 1.0)
    loc = gl.glGetAttribLocation(hprog, 'a_3')
    gl.glVertexAttrib3f(loc, 1.0, 1.0, 1.0)
    loc = gl.glGetAttribLocation(hprog, 'a_4')
    gl.glVertexAttrib4f(loc, 1.0, 1.0, 1.0, 1.0)
    
    # --- flush and finish
    
    # Not really necessary, but we want to touch the functions
    gl.glFlush()
    gl.glFinish()
    
    #print([i[1] for i in objects])
    return objects
Beispiel #2
0
    def on_initialize(self, event):
        # Build & activate cube program
        self.cube = gl.glCreateProgram()
        vertex = gl.glCreateShader(gl.GL_VERTEX_SHADER)
        fragment = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
        gl.glShaderSource(vertex, cube_vertex)
        gl.glShaderSource(fragment, cube_fragment)
        gl.glCompileShader(vertex)
        gl.glCompileShader(fragment)
        gl.glAttachShader(self.cube, vertex)
        gl.glAttachShader(self.cube, fragment)
        gl.glLinkProgram(self.cube)
        gl.glDetachShader(self.cube, vertex)
        gl.glDetachShader(self.cube, fragment)
        gl.glUseProgram(self.cube)

        # Get data & build cube buffers
        vcube_data, self.icube_data = makecube()
        vcube = gl.glCreateBuffer()
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, vcube)
        gl.glBufferData(gl.GL_ARRAY_BUFFER, vcube_data, gl.GL_STATIC_DRAW)
        icube = gl.glCreateBuffer()
        gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, icube)
        gl.glBufferData(gl.GL_ELEMENT_ARRAY_BUFFER,
                        self.icube_data, gl.GL_STATIC_DRAW)

        # Bind cube attributes
        stride = vcube_data.strides[0]
        offset = 0
        loc = gl.glGetAttribLocation(self.cube, "a_position")
        gl.glEnableVertexAttribArray(loc)
        gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, stride, offset)

        offset = vcube_data.dtype["a_position"].itemsize
        loc = gl.glGetAttribLocation(self.cube, "a_texcoord")
        gl.glEnableVertexAttribArray(loc)
        gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, stride, offset)

        # Create & bind cube texture
        crate = checkerboard()
        texture = gl.glCreateTexture()
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER,
                           gl.GL_LINEAR)
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER,
                           gl.GL_LINEAR)
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_S,
                           gl.GL_CLAMP_TO_EDGE)
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_T,
                           gl.GL_CLAMP_TO_EDGE)
        gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_LUMINANCE, gl.GL_LUMINANCE,
                        gl.GL_UNSIGNED_BYTE, crate.shape[:2])
        gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, gl.GL_LUMINANCE,
                           gl.GL_UNSIGNED_BYTE, crate)
        loc = gl.glGetUniformLocation(self.cube, "u_texture")
        gl.glUniform1i(loc, texture)
        gl.glBindTexture(gl.GL_TEXTURE_2D, 0)

        # Create & bind cube matrices
        view = np.eye(4, dtype=np.float32)
        model = np.eye(4, dtype=np.float32)
        projection = np.eye(4, dtype=np.float32)
        translate(view, 0, 0, -7)
        self.phi, self.theta = 60, 20
        rotate(model, self.theta, 0, 0, 1)
        rotate(model, self.phi, 0, 1, 0)
        loc = gl.glGetUniformLocation(self.cube, "u_model")
        gl.glUniformMatrix4fv(loc, 1, False, model)
        loc = gl.glGetUniformLocation(self.cube, "u_view")
        gl.glUniformMatrix4fv(loc, 1, False, view)
        loc = gl.glGetUniformLocation(self.cube, "u_projection")
        gl.glUniformMatrix4fv(loc, 1, False, projection)

        # OpenGL initalization
        gl.glClearColor(0.30, 0.30, 0.35, 1.00)
        gl.glEnable(gl.GL_DEPTH_TEST)

        self.timer.start()
    def on_initialize(self, event):
        # Build & activate cube program
        self.cube = gl.glCreateProgram()
        vertex = gl.glCreateShader(gl.GL_VERTEX_SHADER)
        fragment = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
        gl.glShaderSource(vertex, cube_vertex)
        gl.glShaderSource(fragment, cube_fragment)
        gl.glCompileShader(vertex)
        gl.glCompileShader(fragment)
        gl.glAttachShader(self.cube, vertex)
        gl.glAttachShader(self.cube, fragment)
        gl.glLinkProgram(self.cube)
        gl.glDetachShader(self.cube, vertex)
        gl.glDetachShader(self.cube, fragment)
        gl.glUseProgram(self.cube)

        # Get data & build cube buffers
        vcube_data, self.icube_data = makecube()
        vcube = gl.glCreateBuffer()
        gl.glBindBuffer(gl.GL_ARRAY_BUFFER, vcube)
        gl.glBufferData(gl.GL_ARRAY_BUFFER, vcube_data, gl.GL_STATIC_DRAW)
        icube = gl.glCreateBuffer()
        gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, icube)
        gl.glBufferData(gl.GL_ELEMENT_ARRAY_BUFFER, self.icube_data,
                        gl.GL_STATIC_DRAW)

        # Bind cube attributes
        stride = vcube_data.strides[0]
        offset = 0
        loc = gl.glGetAttribLocation(self.cube, "a_position")
        gl.glEnableVertexAttribArray(loc)
        gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, stride, offset)

        offset = vcube_data.dtype["a_position"].itemsize
        loc = gl.glGetAttribLocation(self.cube, "a_texcoord")
        gl.glEnableVertexAttribArray(loc)
        gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, stride, offset)

        # Create & bind cube texture
        crate = checkerboard()
        texture = gl.glCreateTexture()
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER,
                           gl.GL_LINEAR)
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER,
                           gl.GL_LINEAR)
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_S,
                           gl.GL_CLAMP_TO_EDGE)
        gl.glTexParameterf(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_T,
                           gl.GL_CLAMP_TO_EDGE)
        gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_LUMINANCE, gl.GL_LUMINANCE,
                        gl.GL_UNSIGNED_BYTE, crate.shape[:2])
        gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, gl.GL_LUMINANCE,
                           gl.GL_UNSIGNED_BYTE, crate)
        loc = gl.glGetUniformLocation(self.cube, "u_texture")
        gl.glUniform1i(loc, texture)
        gl.glBindTexture(gl.GL_TEXTURE_2D, 0)

        # Create & bind cube matrices
        view = np.eye(4, dtype=np.float32)
        model = np.eye(4, dtype=np.float32)
        projection = np.eye(4, dtype=np.float32)
        translate(view, 0, 0, -7)
        self.phi, self.theta = 60, 20
        rotate(model, self.theta, 0, 0, 1)
        rotate(model, self.phi, 0, 1, 0)
        loc = gl.glGetUniformLocation(self.cube, "u_model")
        gl.glUniformMatrix4fv(loc, 1, False, model)
        loc = gl.glGetUniformLocation(self.cube, "u_view")
        gl.glUniformMatrix4fv(loc, 1, False, view)
        loc = gl.glGetUniformLocation(self.cube, "u_projection")
        gl.glUniformMatrix4fv(loc, 1, False, projection)

        # OpenGL initalization
        gl.glClearColor(0.30, 0.30, 0.35, 1.00)
        gl.glEnable(gl.GL_DEPTH_TEST)
        self._resize(*(self.size + self.physical_size))
        self.timer = app.Timer('auto', self.on_timer, start=True)
Beispiel #4
0
def _prepare_vis():

    objects = []

    # --- program and shaders

    # Create program and shaders
    hprog = gl.glCreateProgram()
    hvert = gl.glCreateShader(gl.GL_VERTEX_SHADER)
    hfrag = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
    objects.append((gl.glDeleteProgram, hprog))
    objects.append((gl.glDeleteShader, hvert))
    objects.append((gl.glDeleteShader, hfrag))

    # Compile source code
    gl.glShaderSource(hvert, VERT)
    gl.glShaderSource(hfrag, FRAG)
    gl.glCompileShader(hvert)
    gl.glCompileShader(hfrag)

    # Check
    assert gl.glGetShaderInfoLog(hvert) == ''
    assert gl.glGetShaderInfoLog(hfrag) == ''
    assert gl.glGetShaderParameter(hvert, gl.GL_COMPILE_STATUS) == 1
    assert gl.glGetShaderParameter(hfrag, gl.GL_COMPILE_STATUS) == 1

    # Attach and link
    gl.glAttachShader(hprog, hvert)
    gl.glAttachShader(hprog, hfrag)
    # touch glDetachShader
    gl.glDetachShader(hprog, hvert)
    gl.glAttachShader(hprog, hvert)

    # Bind all attributes - we could let this occur automatically, but some
    # implementations bind an attribute to index 0, which has the unfortunate
    # property of being unable to be modified.
    gl.glBindAttribLocation(hprog, 1, 'a_1')
    gl.glBindAttribLocation(hprog, 2, 'a_2')
    gl.glBindAttribLocation(hprog, 3, 'a_3')
    gl.glBindAttribLocation(hprog, 4, 'a_4')

    gl.glLinkProgram(hprog)

    # Test that indeed these shaders are attached
    attached_shaders = gl.glGetAttachedShaders(hprog)
    assert_equal(set(attached_shaders), set([hvert, hfrag]))

    # Check
    assert_equal(gl.glGetProgramInfoLog(hprog), '')
    assert_equal(gl.glGetProgramParameter(hprog, gl.GL_LINK_STATUS), 1)
    gl.glValidateProgram(hprog)
    assert_equal(gl.glGetProgramParameter(hprog, gl.GL_VALIDATE_STATUS), 1)

    # Use it!
    gl.glUseProgram(hprog)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # Check source
    vert_source = gl.glGetShaderSource(hvert)
    assert_true('attribute vec2 a_2;' in vert_source)

    # --- get information on attributes and uniforms

    # Count attributes and uniforms
    natt = gl.glGetProgramParameter(hprog, gl.GL_ACTIVE_ATTRIBUTES)
    nuni = gl.glGetProgramParameter(hprog, gl.GL_ACTIVE_UNIFORMS)
    assert_equal(natt, 4)
    assert_equal(nuni, 4+4+3+1)

    # Get names
    names = {}
    for i in range(natt):
        name, count, type = gl.glGetActiveAttrib(hprog, i)
        names[name] = type
        assert_equal(count, 1)
    for i in range(nuni):
        name, count, type = gl.glGetActiveUniform(hprog, i)
        names[name] = type
        assert_equal(count, 1)

    # Check
    assert_equal(names['a_1'], gl.GL_FLOAT)
    assert_equal(names['a_2'], gl.GL_FLOAT_VEC2)
    assert_equal(names['a_3'], gl.GL_FLOAT_VEC3)
    assert_equal(names['a_4'], gl.GL_FLOAT_VEC4)
    assert_equal(names['s_1'], gl.GL_SAMPLER_2D)
    #
    for i, type in enumerate([gl.GL_FLOAT, gl.GL_FLOAT_VEC2,
                              gl.GL_FLOAT_VEC3, gl.GL_FLOAT_VEC4]):
        assert_equal(names['u_f%i' % (i+1)], type)
    for i, type in enumerate([gl.GL_INT, gl.GL_INT_VEC2,
                              gl.GL_INT_VEC3, gl.GL_INT_VEC4]):
        assert_equal(names['u_i%i' % (i+1)], type)
    for i, type in enumerate([gl.GL_FLOAT_MAT2, gl.GL_FLOAT_MAT3,
                              gl.GL_FLOAT_MAT4]):
        assert_equal(names['u_m%i' % (i+2)], type)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- texture

    # Create, bind, activate
    htex = gl.glCreateTexture()
    objects.append((gl.glDeleteTexture, htex))
    gl.glPixelStorei(gl.GL_UNPACK_ALIGNMENT, 1)
    gl.glBindTexture(gl.GL_TEXTURE_2D, htex)

    # Allocate data and upload
    # This data is luminance and not C-contiguous
    gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_LUMINANCE, gl.GL_LUMINANCE,
                    gl.GL_UNSIGNED_BYTE, im2)  # touch
    gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_LUMINANCE, gl.GL_LUMINANCE,
                    gl.GL_UNSIGNED_BYTE, im2.shape[:2])
    gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, gl.GL_LUMINANCE,
                       gl.GL_UNSIGNED_BYTE, im2)

    # Set texture parameters (use f and i to touch both)
    T = gl.GL_TEXTURE_2D
    gl.glTexParameterf(T, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR)
    gl.glTexParameteri(T, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR)

    # Re-allocate data and upload
    gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGB, gl.GL_RGB,
                    gl.GL_UNSIGNED_BYTE, im1.shape[:2])
    gl.glTexSubImage2D(gl.GL_TEXTURE_2D, 0, 0, 0, gl.GL_RGB,
                       gl.GL_UNSIGNED_BYTE, im1)

    # Attach!
    loc = gl.glGetUniformLocation(hprog, 's_1')
    unit = 0
    gl.glActiveTexture(gl.GL_TEXTURE0+unit)
    gl.glUniform1i(loc, unit)

    # Mipmaps (just to touch this function)
    gl.glGenerateMipmap(gl.GL_TEXTURE_2D)

    # Check min filter (touch getTextParameter)
    minfilt = gl.glGetTexParameter(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER)
    assert_equal(minfilt, gl.GL_LINEAR)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- buffer vec2 (contiguous VBO)

    # Create buffer
    hbuf2 = gl.glCreateBuffer()
    objects.append((gl.glDeleteBuffer, hbuf2))
    gl.glBindBuffer(gl.GL_ARRAY_BUFFER, hbuf2)

    # Allocate and set data
    gl.glBufferData(gl.GL_ARRAY_BUFFER, buf2.nbytes, gl.GL_DYNAMIC_DRAW)
    gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, buf2)

    # Attach!
    loc = gl.glGetAttribLocation(hprog, 'a_2')
    gl.glDisableVertexAttribArray(loc)  # touch
    gl.glEnableVertexAttribArray(loc)
    gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, 2*4, 0)

    # Check (touch glGetBufferParameter, glGetVertexAttrib and
    # glGetVertexAttribOffset)
    size = gl.glGetBufferParameter(gl.GL_ARRAY_BUFFER, gl.GL_BUFFER_SIZE)
    assert_equal(size, buf2.nbytes)
    stride = gl.glGetVertexAttrib(loc, gl.GL_VERTEX_ATTRIB_ARRAY_STRIDE)
    assert_equal(stride, 2*4)
    offset = gl.glGetVertexAttribOffset(loc, gl.GL_VERTEX_ATTRIB_ARRAY_POINTER)
    assert_equal(offset, 0)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- buffer vec3 (non-contiguous VBO)

    # Create buffer
    hbuf3 = gl.glCreateBuffer()
    objects.append((gl.glDeleteBuffer, hbuf3))
    gl.glBindBuffer(gl.GL_ARRAY_BUFFER, hbuf3)

    # Allocate and set data
    gl.glBufferData(gl.GL_ARRAY_BUFFER, buf3.nbytes, gl.GL_DYNAMIC_DRAW)
    gl.glBufferSubData(gl.GL_ARRAY_BUFFER, 0, buf3)

    # Attach!
    loc = gl.glGetAttribLocation(hprog, 'a_3')
    gl.glEnableVertexAttribArray(loc)
    gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, 3*4, 0)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- buffer vec4 (client vertex data)

    # Select no FBO
    gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)

    # Attach!
    loc = gl.glGetAttribLocation(hprog, 'a_4')
    gl.glEnableVertexAttribArray(loc)
    gl.glVertexAttribPointer(loc, 4, gl.GL_FLOAT, False, 4*4, buf4)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- element buffer

    # Create buffer
    global helements
    helements = gl.glCreateBuffer()
    objects.append((gl.glDeleteBuffer, helements))
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, helements)

    # Allocate and set data
    gl.glBufferData(gl.GL_ELEMENT_ARRAY_BUFFER, elements, gl.GL_DYNAMIC_DRAW)
    gl.glBufferSubData(gl.GL_ELEMENT_ARRAY_BUFFER, 0, elements)

    # Turn off
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, 0)

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- uniforms

    # Set integer uniforms to 0
    # We set them twice just to touch both i and iv functions
    for i, fun1, fun2 in [(1, gl.glUniform1i, gl.glUniform1iv),
                          (2, gl.glUniform2i, gl.glUniform2iv),
                          (3, gl.glUniform3i, gl.glUniform3iv),
                          (4, gl.glUniform4i, gl.glUniform4iv)]:
        name = 'u_i%i' % i
        value = [0] * i
        loc = gl.glGetUniformLocation(hprog, name)
        fun1(loc, *value)  # e.g. glUniform4i
        fun2(loc, 1, value)  # e.g. glUniform4iv

    # Set float uniforms to 1.0
    # We set them twice just to touch both i and iv functions
    for i, fun1, fun2 in [(1, gl.glUniform1f, gl.glUniform1fv),
                          (2, gl.glUniform2f, gl.glUniform2fv),
                          (3, gl.glUniform3f, gl.glUniform3fv),
                          (4, gl.glUniform4f, gl.glUniform4fv)]:
        name = 'u_f%i' % i
        value = [1.0] * i
        loc = gl.glGetUniformLocation(hprog, name)
        fun1(loc, *value)  # e.g. glUniform4f
        fun2(loc, 1, value)  # e.g. glUniform4fv

    # Set matrix uniforms
    m = np.eye(5, dtype='float32')
    loc = gl.glGetUniformLocation(hprog, 'u_m2')
    gl.glUniformMatrix2fv(loc, 1, False, m[:2, :2])
    #
    loc = gl.glGetUniformLocation(hprog, 'u_m3')
    m = np.eye(3, dtype='float32')
    gl.glUniformMatrix3fv(loc, 1, False, m[:3, :3])
    #
    loc = gl.glGetUniformLocation(hprog, 'u_m4')
    m = np.eye(4, dtype='float32')
    gl.glUniformMatrix4fv(loc, 1, False, m[:4, :4])

    # Check some uniforms
    loc = gl.glGetUniformLocation(hprog, 'u_i1')
    assert_equal(gl.glGetUniform(hprog, loc), 0)
    loc = gl.glGetUniformLocation(hprog, 'u_i2')
    assert_equal(gl.glGetUniform(hprog, loc), (0, 0))
    loc = gl.glGetUniformLocation(hprog, 'u_f2')
    assert_equal(gl.glGetUniform(hprog, loc), (1.0, 1.0))

    # Check if all is ok
    assert_equal(gl.glGetError(), 0)

    # --- attributes

    # Constant values for attributes. We do not even use this ...
    loc = gl.glGetAttribLocation(hprog, 'a_1')
    gl.glVertexAttrib1f(loc, 1.0)
    loc = gl.glGetAttribLocation(hprog, 'a_2')
    gl.glVertexAttrib2f(loc, 1.0, 1.0)
    loc = gl.glGetAttribLocation(hprog, 'a_3')
    gl.glVertexAttrib3f(loc, 1.0, 1.0, 1.0)
    loc = gl.glGetAttribLocation(hprog, 'a_4')
    gl.glVertexAttrib4f(loc, 1.0, 1.0, 1.0, 1.0)

    # --- flush and finish

    # Not really necessary, but we want to touch the functions
    gl.glFlush()
    gl.glFinish()

    # print([i[1] for i in objects])
    return objects