Python glDrawElements Examples

Example #1

File: test_functionality.py Project: djhoese/vispy

def _draw2():
    # Draw using elements via buffer
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, helements)
    gl.glDrawElements(gl.GL_TRIANGLES, elements.size, gl.GL_UNSIGNED_BYTE, 0)
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, 0)
    gl.glFinish()
    _check_result()

Example #2

File: test_functionality.py Project: alexflint/vispy

def _draw2():
    # Draw using elements via buffer
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, helements)
    gl.glDrawElements(gl.GL_TRIANGLES, elements.size, gl.GL_UNSIGNED_BYTE, 0)
    gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, 0)
    gl.glFinish()
    _check_result()

Example #3

File: rawgl-cube.py Project: dengemann/vispy

    def on_paint(self, event):

        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        # Activate program  and texture
        gl.glUseProgram(self._prog_handle)
        gl.glBindTexture(gl.GL_TEXTURE_2D, self._tex_handle)

        # Set attributes (again, the loc can be cached)
        loc = gl.glGetAttribLocation(
            self._prog_handle,
            'a_position'.encode('utf-8'))
        gl.glEnableVertexAttribArray(loc)
        if use_buffers:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._positions_handle)
            gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, 0, None)
        else:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)  # 0 means do not use buffer
            gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, 0, positions)
        #
        loc = gl.glGetAttribLocation(
            self._prog_handle,
            'a_texcoord'.encode('utf-8'))
        gl.glEnableVertexAttribArray(loc)
        if use_buffers:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._texcoords_handle)
            gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, 0, None)
        else:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)  # 0 means do not use buffer
            gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, 0, texcoords)

        # Set uniforms (note that you could cache the locations)
        loc = gl.glGetUniformLocation(
            self._prog_handle,
            'u_view'.encode('utf-8'))
        gl.glUniformMatrix4fv(loc, 1, False, self.view)
        loc = gl.glGetUniformLocation(
            self._prog_handle,
            'u_model'.encode('utf-8'))
        gl.glUniformMatrix4fv(loc, 1, False, self.model)
        loc = gl.glGetUniformLocation(
            self._prog_handle,
            'u_projection'.encode('utf-8'))
        gl.glUniformMatrix4fv(loc, 1, False, self.projection)

        # Draw
        if use_buffers:
            gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, self._faces_handle)
            gl.glDrawElements(
                gl.GL_TRIANGLES,
                faces.size,
                gl.GL_UNSIGNED_INT,
                None)
        else:
            gl.glDrawElements(
                gl.GL_TRIANGLES,
                faces.size,
                gl.GL_UNSIGNED_INT,
                faces)

Example #4

    def on_paint(self, event):

        gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)

        # Activate program  and texture
        gl.glUseProgram(self._prog_handle)
        gl.glBindTexture(gl.GL_TEXTURE_2D, self._tex_handle)

        # Set attributes (again, the loc can be cached)
        loc = gl.glGetAttribLocation(self._prog_handle,
                                     'a_position'.encode('utf-8'))
        gl.glEnableVertexAttribArray(loc)
        if use_buffers:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._positions_handle)
            gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, 0, None)
        else:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)  # 0 means do not use buffer
            gl.glVertexAttribPointer(loc, 3, gl.GL_FLOAT, False, 0, positions)
        #
        loc = gl.glGetAttribLocation(self._prog_handle,
                                     'a_texcoord'.encode('utf-8'))
        gl.glEnableVertexAttribArray(loc)
        if use_buffers:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._texcoords_handle)
            gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, 0, None)
        else:
            gl.glBindBuffer(gl.GL_ARRAY_BUFFER, 0)  # 0 means do not use buffer
            gl.glVertexAttribPointer(loc, 2, gl.GL_FLOAT, False, 0, texcoords)

        # Set uniforms (note that you could cache the locations)
        loc = gl.glGetUniformLocation(self._prog_handle,
                                      'u_view'.encode('utf-8'))
        gl.glUniformMatrix4fv(loc, 1, False, self.view)
        loc = gl.glGetUniformLocation(self._prog_handle,
                                      'u_model'.encode('utf-8'))
        gl.glUniformMatrix4fv(loc, 1, False, self.model)
        loc = gl.glGetUniformLocation(self._prog_handle,
                                      'u_projection'.encode('utf-8'))
        gl.glUniformMatrix4fv(loc, 1, False, self.projection)

        # Draw
        if use_buffers:
            gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, self._faces_handle)
            gl.glDrawElements(gl.GL_TRIANGLES, faces.size, gl.GL_UNSIGNED_INT,
                              None)
        else:
            gl.glDrawElements(gl.GL_TRIANGLES, faces.size, gl.GL_UNSIGNED_INT,
                              faces)

Example #5

File: test_functionality.py Project: alexflint/vispy

def _draw3():
    # Draw using elements via numpy array
    gl.glDrawElements(gl.GL_TRIANGLES, 
                      elements.size, gl.GL_UNSIGNED_BYTE, elements)
    gl.glFinish()
    _check_result()

Example #6

File: vispy_test.py Project: zoombapup/VNect-tensorflow

 def on_draw(self, event):
     gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
     gl.glDrawElements(gl.GL_TRIANGLES, self.icube_data.size,
                       gl.GL_UNSIGNED_INT, None)

Example #7

File: cube.py Project: Peque/vispy

 def on_draw(self, event):
     gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
     gl.glDrawElements(gl.GL_TRIANGLES, self.icube_data.size,
                       gl.GL_UNSIGNED_INT, None)

Example #8

File: test_functionality.py Project: djhoese/vispy

def _draw3():
    # Draw using elements via numpy array
    gl.glDrawElements(gl.GL_TRIANGLES,
                      elements.size, gl.GL_UNSIGNED_BYTE, elements)
    gl.glFinish()
    _check_result()