def on_initialize(self, event):
gl.glClearColor(1,1,1,1)
gl.glEnable(gl.GL_DEPTH_TEST)
# Create shader program
self._prog_handle = gl.glCreateProgram()
# Create vertex shader
shader = gl.glCreateShader(gl.GL_VERTEX_SHADER)
gl.glShaderSource(shader, VERT_CODE)
gl.glCompileShader(shader)
status = gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS)
if not status:
# We could show more useful info here, but that takes a few lines
raise RuntimeError('Vertex shader did not compile.')
else:
gl.glAttachShader(self._prog_handle, shader)
# Create fragment shader
shader = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
gl.glShaderSource(shader, FRAG_CODE)
gl.glCompileShader(shader)
status = gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS)
if not status:
# We could show more useful info here, but that takes a few lines
raise RuntimeError('Fragment shader did not compile.')
else:
gl.glAttachShader(self._prog_handle, shader)
# Link
gl.glLinkProgram(self._prog_handle)
status = gl.glGetProgramiv(self._prog_handle, gl.GL_LINK_STATUS)
if not status:
# We could show more useful info here, but that takes a few lines
raise RuntimeError('Program did not link.')
# Create texture
im = io.crate()
self._tex_handle = gl.glGenTextures(1)
gl.glPixelStorei(gl.GL_UNPACK_ALIGNMENT, 1)
gl.glBindTexture(gl.GL_TEXTURE_2D, self._tex_handle)
gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGB,
im.shape[1], im.shape[0], 0, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, im)
gl.glTexParameter(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR)
gl.glTexParameter(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR)
if use_buffers:
# Create vertex buffer
self._positions_handle = gl.glGenBuffers(1)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._positions_handle)
gl.glBufferData(gl.GL_ARRAY_BUFFER, positions.nbytes, positions, gl.GL_DYNAMIC_DRAW)
#
self._texcoords_handle = gl.glGenBuffers(1)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._texcoords_handle)
gl.glBufferData(gl.GL_ARRAY_BUFFER, texcoords.nbytes, texcoords, gl.GL_DYNAMIC_DRAW)
# Create buffer for faces
self._faces_handle = gl.glGenBuffers(1)
gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, self._faces_handle)
gl.glBufferData(gl.GL_ELEMENT_ARRAY_BUFFER, faces.nbytes, faces, gl.GL_DYNAMIC_DRAW)
def __init__(self, **kwargs):
app.Canvas.__init__(self, **kwargs)
self.geometry = 0, 0, 400, 400
self.program = oogl.Program(VERT_CODE, FRAG_CODE)
# Set attributes
self.program['a_position'] = oogl.VertexBuffer(positions)
self.program['a_texcoord'] = oogl.VertexBuffer(texcoords)
self.program['u_texture'] = oogl.Texture2D(io.crate())
# Handle transformations
self.init_transforms()
self.timer = app.Timer(1.0/60)
self.timer.connect(self.update_transforms)
self.timer.start()
def __init__(self, **kwargs):
app.Canvas.__init__(self, **kwargs)
self.geometry = 0, 0, 400, 400
self.program = oogl.Program(VERT_CODE, FRAG_CODE)
# Set attributes
self.program['a_position'] = oogl.VertexBuffer(positions)
self.program['a_texcoord'] = oogl.VertexBuffer(texcoords)
self.program['u_texture'] = oogl.Texture2D(io.crate())
# Handle transformations
self.init_transforms()
self.timer = app.Timer(1.0 / 60)
self.timer.connect(self.update_transforms)
self.timer.start()
def on_initialize(self, event):
gl.glClearColor(1, 1, 1, 1)
gl.glEnable(gl.GL_DEPTH_TEST)
# Create shader program
self._prog_handle = gl.glCreateProgram()
# Create vertex shader
shader = gl.glCreateShader(gl.GL_VERTEX_SHADER)
gl.glShaderSource(shader, VERT_CODE)
gl.glCompileShader(shader)
status = gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS)
if not status:
# We could show more useful info here, but that takes a few lines
raise RuntimeError('Vertex shader did not compile.')
else:
gl.glAttachShader(self._prog_handle, shader)
# Create fragment shader
shader = gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
gl.glShaderSource(shader, FRAG_CODE)
gl.glCompileShader(shader)
status = gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS)
if not status:
# We could show more useful info here, but that takes a few lines
raise RuntimeError('Fragment shader did not compile.')
else:
gl.glAttachShader(self._prog_handle, shader)
# Link
gl.glLinkProgram(self._prog_handle)
status = gl.glGetProgramiv(self._prog_handle, gl.GL_LINK_STATUS)
if not status:
# We could show more useful info here, but that takes a few lines
raise RuntimeError('Program did not link.')
# Create texture
im = io.crate()
self._tex_handle = gl.glGenTextures(1)
gl.glPixelStorei(gl.GL_UNPACK_ALIGNMENT, 1)
gl.glBindTexture(gl.GL_TEXTURE_2D, self._tex_handle)
gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGB, im.shape[1],
im.shape[0], 0, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, im)
gl.glTexParameter(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER,
gl.GL_LINEAR)
gl.glTexParameter(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER,
gl.GL_LINEAR)
if use_buffers:
# Create vertex buffer
self._positions_handle = gl.glGenBuffers(1)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._positions_handle)
gl.glBufferData(gl.GL_ARRAY_BUFFER, positions.nbytes, positions,
gl.GL_DYNAMIC_DRAW)
#
self._texcoords_handle = gl.glGenBuffers(1)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self._texcoords_handle)
gl.glBufferData(gl.GL_ARRAY_BUFFER, texcoords.nbytes, texcoords,
gl.GL_DYNAMIC_DRAW)
# Create buffer for faces
self._faces_handle = gl.glGenBuffers(1)
gl.glBindBuffer(gl.GL_ELEMENT_ARRAY_BUFFER, self._faces_handle)
gl.glBufferData(gl.GL_ELEMENT_ARRAY_BUFFER, faces.nbytes, faces,
gl.GL_DYNAMIC_DRAW)
# -*- coding: utf-8 -*- # vispy: gallery 2 """ Example demonstrating the use of textures in vispy.oogl. Three textures are created and combined in the fragment shader. """ from vispy.oogl import Program, Texture2D, VertexBuffer, ElementBuffer from vispy import app, gl, io import numpy as np # Texture 1 im1 = io.crate() # Texture with bumbs (to muliply with im1) im2 = np.ones((20,20), 'float32') im2[::3,::3] = 0.5 # Texture with a plus sign (to subtract from im1) im3 = np.zeros((30,30), 'float32') im3[10,:] = 1.0 im3[:,10] = 1.0 # Create vetices and texture coords in two separate arrays. # Note that combining both in one array (as in hello_quad2) # results in better performance. positions = np.array([ [-0.8, -0.8, 0.0], [+0.7, -0.7, 0.0],
