def __init__(self):
self.width = 1024
self.height = 768
self.window = GLFWViewer(self.width, self.height, (0.2, 0.2, 0.2, 1.0))
self.matcap_img = assets.imread("matcap/jeepster_skinmat2.jpg").astype(
np.float32) / 255
# self.matcap_img = assets.imread("container2_axis.png").astype(np.float32)[...,[0,1,2]]/255
self.matcap_img = np.flip(self.matcap_img, 0)
def draw(self):
GLFWViewer.poll_events()
glViewport(0, 0, self.width, self.height)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
with program.use(self.prog) as prog:
program.set_uniform(prog, 'projectionMatrix',
self.window.projection_matrix)
program.set_uniform(prog, 'viewMatrix', self.window.view_matrix)
program.set_uniform(prog, 'modelMatrix', np.eye(4))
glBindTexture(GL_TEXTURE_2D, self.matcap_tex)
program.set_uniform(prog, 'matCap', 0)
imdraw.torusknot(prog)
self.window.swap_buffers()
class Viewer:
def __init__(self):
self.width = 1024
self.height = 768
self.window = GLFWViewer(self.width, self.height, (0.2, 0.2, 0.2, 1.0))
self.matcap_img = assets.imread("matcap/jeepster_skinmat2.jpg").astype(
np.float32) / 255
# self.matcap_img = assets.imread("container2_axis.png").astype(np.float32)[...,[0,1,2]]/255
self.matcap_img = np.flip(self.matcap_img, 0)
def setup(self):
glEnable(GL_DEPTH_TEST)
glEnable(GL_CULL_FACE)
glEnable(GL_PROGRAM_POINT_SIZE)
self.prog = program.create(*glsl.read("matcap"))
self.matcap_tex = texture.create(self.matcap_img, 0, GL_RGB)
def resize(self):
with self.window:
pass
def draw(self):
GLFWViewer.poll_events()
glViewport(0, 0, self.width, self.height)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
with program.use(self.prog) as prog:
program.set_uniform(prog, 'projectionMatrix',
self.window.projection_matrix)
program.set_uniform(prog, 'viewMatrix', self.window.view_matrix)
program.set_uniform(prog, 'modelMatrix', np.eye(4))
glBindTexture(GL_TEXTURE_2D, self.matcap_tex)
program.set_uniform(prog, 'matCap', 0)
imdraw.torusknot(prog)
self.window.swap_buffers()
def start(self):
with self.window:
self.setup()
while not self.window.should_close():
self.draw()
def __init__(self, scene):
# window
self.width = 1024
self.height = 768
self.window = GLFWViewer(self.width, self.height, (0.2, 0.2, 0.2, 1.0))
self.camera = PerspectiveCamera(glm.inverse(self.window.view_matrix),
glm.radians(60),
self.width / self.height, 1, 30)
self.scene = scene
# assets
self.environment_image = assets.imread('hdri/Tropical_Beach_3k.hdr')
self.environment_image = assets.to_linear(self.environment_image)
# render passes
self.environment_pass = EnvironmentPass(512, 512)
self.irradiance_pass = IrradiancePass(32, 32)
self.prefilter_pass = PrefilterPass()
self.brdf_pass = BRDFPass(512, 512)
self.tonemapping_pass = TonemappingPass(self.width, self.height)
self.geometry_pass = GeometryPass(self.width, self.height,
self.draw_scene_for_geometry)
dirlight.shadowpass = DepthPass(1024, 1024, GL_FRONT,
self.draw_scene_for_shadows)
spotlight.shadowpass = DepthPass(1024, 1024, GL_FRONT,
self.draw_scene_for_shadows)
pointlight.shadowpass = CubeDepthPass(
512,
512,
GL_FRONT,
near=1,
far=15,
draw_scene=self.draw_scene_for_shadows)
self.lighting_pass = LightingPass(
self.width, self.height, lights=[dirlight, spotlight, pointlight])
from OpenGL.GL import *
from editor.render.window import GLFWViewer
import numpy as np
from editor.render.puregl import program
from editor.render import glsl, imdraw
import glm
import logging
logging.basicConfig(
filename=None,
level=logging.DEBUG,
format='%(levelname)s:%(module)s.%(funcName)s: %(message)s')
width, height = 1024, 768
model_matrix = np.identity(4)
window = GLFWViewer(width, height, (0.6, 0.7, 0.7, 1.0))
with window:
glEnable(GL_DEPTH_TEST)
glEnable(GL_CULL_FACE)
while not window.should_close():
glViewport(0, 0, window.width, window.height)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
with program.use(skybox_program):
program.set_uniform(skybox_program, 'projection',
window.projection_matrix)
sky_view = glm.mat4(glm.mat3(window.view_matrix))
program.set_uniform(skybox_program, 'view', sky_view)
camera_pos = glm.transpose(
glm.transpose(glm.inverse(window.view_matrix)))[3].xyz
class Viewer:
def __init__(self, scene):
# window
self.width = 1024
self.height = 768
self.window = GLFWViewer(self.width, self.height, (0.2, 0.2, 0.2, 1.0))
self.camera = PerspectiveCamera(glm.inverse(self.window.view_matrix),
glm.radians(60),
self.width / self.height, 1, 30)
self.scene = scene
# assets
self.environment_image = assets.imread('hdri/Tropical_Beach_3k.hdr')
self.environment_image = assets.to_linear(self.environment_image)
# render passes
self.environment_pass = EnvironmentPass(512, 512)
self.irradiance_pass = IrradiancePass(32, 32)
self.prefilter_pass = PrefilterPass()
self.brdf_pass = BRDFPass(512, 512)
self.tonemapping_pass = TonemappingPass(self.width, self.height)
self.geometry_pass = GeometryPass(self.width, self.height,
self.draw_scene_for_geometry)
dirlight.shadowpass = DepthPass(1024, 1024, GL_FRONT,
self.draw_scene_for_shadows)
spotlight.shadowpass = DepthPass(1024, 1024, GL_FRONT,
self.draw_scene_for_shadows)
pointlight.shadowpass = CubeDepthPass(
512,
512,
GL_FRONT,
near=1,
far=15,
draw_scene=self.draw_scene_for_shadows)
self.lighting_pass = LightingPass(
self.width, self.height, lights=[dirlight, spotlight, pointlight])
def get_geometry_buffer(self, mesh):
try:
geometry_buffers = self._geometry_buffers
except AttributeError:
geometry_buffers = dict()
self._geometry_buffers = geometry_buffers
try:
geo_buffer = geometry_buffers[mesh]
except KeyError:
logging.debug("create goemetry buffer for {}".format(mesh))
positions = mesh.geometry.positions
normals = mesh.geometry.normals
uvs = mesh.geometry.uvs
indices = mesh.geometry.indices
# create vertex buffers
pos_vbo, uv_vbo, normal_vbo = glGenBuffers(3)
glBindBuffer(GL_ARRAY_BUFFER, pos_vbo)
glBufferData(GL_ARRAY_BUFFER, positions.nbytes, positions,
GL_STATIC_DRAW)
glBindBuffer(GL_ARRAY_BUFFER, uv_vbo)
glBufferData(GL_ARRAY_BUFFER, uvs.nbytes, uvs, GL_STATIC_DRAW)
glBindBuffer(GL_ARRAY_BUFFER, normal_vbo)
glBufferData(GL_ARRAY_BUFFER, normals.nbytes, normals,
GL_STATIC_DRAW)
glBindBuffer(GL_ARRAY_BUFFER, 0)
# create vertex array
vao = glGenVertexArrays(1)
# create element buffer
ebo = glGenBuffers(1)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo)
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.nbytes, indices,
GL_STATIC_DRAW)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
# link buffer to geometry
geo_buffer = (vao, ebo, pos_vbo, uv_vbo, normal_vbo, indices.size)
geometry_buffers[mesh] = geo_buffer
return geo_buffer
def draw_scene_for_geometry(self, prog):
import ctypes
for child in self.scene.children:
# set uniforms
program.set_uniform(prog, 'model', child.transform)
program.set_uniform(prog, 'albedo', child.material.albedo)
program.set_uniform(prog, 'roughness', child.material.roughness)
program.set_uniform(prog, 'metallic', child.material.metallic)
# set attributes
vao, ebo, pos_vbo, uv_vbo, normal_vbo, count = self.get_geometry_buffer(
child)
glBindVertexArray(vao)
position_location = glGetAttribLocation(prog, 'position')
glBindBuffer(GL_ARRAY_BUFFER, pos_vbo)
glVertexAttribPointer(position_location, 3, GL_FLOAT, False, 0,
ctypes.c_void_p(0))
glEnableVertexAttribArray(position_location)
uv_location = glGetAttribLocation(prog, 'uv')
if uv_location is not -1:
glBindBuffer(GL_ARRAY_BUFFER, uv_vbo)
glVertexAttribPointer(uv_location, 2, GL_FLOAT, False, 0,
ctypes.c_void_p(0))
glEnableVertexAttribArray(uv_location)
normal_location = glGetAttribLocation(prog, 'normal')
if normal_location is not -1:
glBindBuffer(GL_ARRAY_BUFFER, normal_vbo)
glVertexAttribPointer(normal_location, 3, GL_FLOAT, False, 0,
ctypes.c_void_p(0))
glEnableVertexAttribArray(normal_location)
# draw geometry
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo)
glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, None)
# cleanup bindings
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
glBindBuffer(GL_ARRAY_BUFFER, 0)
glBindVertexArray(0)
def draw_scene_for_shadows(self, prog):
for child in self.scene.children:
# set uniforms
program.set_uniform(prog, 'model', child.transform)
# set attributes
vao, ebo, pos_vbo, uv_vbo, normal_vbo, count = self.get_geometry_buffer(
child)
glBindVertexArray(vao)
position_location = glGetAttribLocation(prog, 'position')
glBindBuffer(GL_ARRAY_BUFFER, pos_vbo)
glVertexAttribPointer(position_location, 3, GL_FLOAT, False, 0,
ctypes.c_void_p(0))
glEnableVertexAttribArray(position_location)
# draw geometry
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo)
glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, None)
# cleanup bindings
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0)
glBindBuffer(GL_ARRAY_BUFFER, 0)
glBindVertexArray(0)
def setup(self):
logging.debug("setup viewer")
# Render passes
# -------------
# geometry
self.geometry_pass.setup()
# environment
self.environment_tex = texture.create(self.environment_image,
0,
format=GL_RGB,
wrap_s=GL_CLAMP_TO_EDGE,
wrap_t=GL_CLAMP_TO_EDGE,
min_filter=GL_LINEAR,
mag_filter=GL_LINEAR)
self.environment_pass.texture = self.environment_tex
self.environment_pass.setup()
self.environment_pass.render()
# ibl
self.prefilter_pass.setup()
self.prefilter_pass.environment = self.environment_pass.cubemap
self.prefilter_pass.render()
self.irradiance_pass.setup()
self.irradiance_pass.environment = self.environment_pass.cubemap
self.irradiance_pass.render()
self.brdf_pass.setup()
self.brdf_pass.render()
# shadows
dirlight.shadowpass.setup()
spotlight.shadowpass.setup()
pointlight.shadowpass.setup()
# lighting
self.lighting_pass.setup()
self.lighting_pass.irradiance = self.irradiance_pass.irradiance
self.lighting_pass.prefilter = self.prefilter_pass.prefilter
self.lighting_pass.brdf = self.brdf_pass.brdflut
# setup forward rendering
self.forward_fbo = glGenFramebuffers(1)
with fbo.bind(self.forward_fbo):
glDrawBuffers(1, [GL_COLOR_ATTACHMENT0 + 0])
self.forward_texture = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D, self.forward_texture)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, self.width, self.height,
0, GL_RGBA, GL_FLOAT, None)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, self.forward_texture, 0)
glBindTexture(GL_TEXTURE_2D, 0)
# create depth+stencil buffer
rbo = glGenRenderbuffers(1)
glBindRenderbuffer(GL_RENDERBUFFER, rbo)
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8,
self.width, self.height)
glBindRenderbuffer(GL_RENDERBUFFER, 0)
glFramebufferRenderbuffer(GL_FRAMEBUFFER,
GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, rbo)
assert glCheckFramebufferStatus(
GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE
self.skybox_program = program.create(*glsl.read('skybox'))
# tonemapping
self.tonemapping_pass.setup()
def resize(self):
with self.window:
pass
def render(self):
# Animate
# -------
import math, time
spotlight.position = glm.vec3(math.cos(time.time() * 3) * 4, 0.3, -4)
spotlight.direction = -spotlight.position
pointlight.position = glm.vec3(
math.cos(time.time()) * 4, 4,
math.sin(time.time()) * 4)
self.camera.transform = glm.inverse(self.window.view_matrix)
# Render passes
# -------------
## Geometry
self.geometry_pass.camera = self.camera # window.projection_matrix, window.view_matrix
self.geometry_pass.render()
## Shadowmaps
dirlight.shadowpass.camera = dirlight.camera
dirlight.shadowpass.render()
spotlight.shadowpass.camera = spotlight.camera
spotlight.shadowpass.render()
pointlight.shadowpass.position = pointlight.position
pointlight.shadowpass.render()
## Lighting
self.lighting_pass.cameraPos = self.camera.position
self.lighting_pass.gPosition = self.geometry_pass.gPosition
self.lighting_pass.gNormal = self.geometry_pass.gNormal
self.lighting_pass.gAlbedoSpecular = self.geometry_pass.gAlbedoSpecular
self.lighting_pass.gRoughness = self.geometry_pass.gRoughness
self.lighting_pass.gMetallic = self.geometry_pass.gMetallic
self.lighting_pass.gEmissive = self.geometry_pass.gEmissive
self.lighting_pass.render()
## Forward rendering
# - Copy depth from geometry pass
glBindFramebuffer(GL_READ_FRAMEBUFFER, self.geometry_pass.gBuffer)
glBindFramebuffer(GL_DRAW_FRAMEBUFFER,
self.forward_fbo) # write to default framebuffer
glBlitFramebuffer(0, 0, self.width, self.height, 0, 0, self.width,
self.height, GL_DEPTH_BUFFER_BIT, GL_NEAREST)
glBindFramebuffer(GL_READ_FRAMEBUFFER, self.lighting_pass.fbo)
glBlitFramebuffer(0, 0, self.width, self.height, 0, 0, self.width,
self.height, GL_COLOR_BUFFER_BIT, GL_NEAREST)
glBindFramebuffer(GL_FRAMEBUFFER, 0)
glEnable(GL_DEPTH_TEST)
glDepthFunc(GL_LEQUAL)
glDepthMask(GL_FALSE)
with fbo.bind(self.forward_fbo):
# draw skybox
glViewport(0, 0, self.width, self.height)
with program.use(self.skybox_program) as prog:
program.set_uniform(prog, 'projection', self.camera.projection)
sky_view = glm.mat4(glm.mat3(self.camera.view))
program.set_uniform(prog, 'view', sky_view)
program.set_uniform(prog, 'cameraPos', self.camera.position)
program.set_uniform(prog, 'skybox', 0)
program.set_uniform(prog, 'groundProjection', True)
glActiveTexture(GL_TEXTURE0 + 0)
glBindTexture(GL_TEXTURE_CUBE_MAP,
self.environment_pass.cubemap)
imdraw.cube(prog, flip=True)
glBindTexture(GL_TEXTURE_CUBE_MAP, 0)
glDepthMask(GL_TRUE)
## Tonemapping
self.tonemapping_pass.hdrimage = self.lighting_pass.beauty
self.tonemapping_pass.exposure = 0.0
self.tonemapping_pass.gamma = 2.2
self.tonemapping_pass.render()
# Render to screen
# ----------------
glViewport(0, 0, self.width, self.height)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glDisable(GL_DEPTH_TEST)
# draw to screen
imdraw.texture(self.tonemapping_pass.ldrimage,
(0, 0, self.width, self.height))
# debug
imdraw.texture(self.geometry_pass.gPosition, (0, 0, 90, 90))
imdraw.texture(self.geometry_pass.gNormal, (100, 0, 90, 90))
imdraw.texture(self.geometry_pass.gAlbedoSpecular, (200, 0, 90, 90),
shuffle=(0, 1, 2, -1))
imdraw.texture(self.geometry_pass.gAlbedoSpecular, (300, 0, 90, 90),
shuffle=(3, 3, 3, -1))
imdraw.texture(self.geometry_pass.gRoughness, (400, 0, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.texture(self.geometry_pass.gMetallic, (500, 0, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.texture(dirlight.shadowpass.texture, (0, 100, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.texture(spotlight.shadowpass.texture, (100, 100, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.cubemap(pointlight.shadowpass.cubemap, (200, 100, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.texture(self.environment_tex, (0, 200, 90, 90))
imdraw.cubemap(self.environment_pass.cubemap, (100, 200, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.cubemap(self.irradiance_pass.irradiance, (200, 200, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.cubemap(self.prefilter_pass.prefilter, (300, 200, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.texture(self.brdf_pass.brdflut, (400, 200, 90, 90))
imdraw.texture(self.lighting_pass.beauty, (0, 300, 90, 90))
# swap buffers
# ------------
self.window.swap_buffers()
GLFWViewer.poll_events()
def start(self):
with self.window:
self.setup()
while not self.window.should_close():
self.render()
def render(self):
# Animate
# -------
import math, time
spotlight.position = glm.vec3(math.cos(time.time() * 3) * 4, 0.3, -4)
spotlight.direction = -spotlight.position
pointlight.position = glm.vec3(
math.cos(time.time()) * 4, 4,
math.sin(time.time()) * 4)
self.camera.transform = glm.inverse(self.window.view_matrix)
# Render passes
# -------------
## Geometry
self.geometry_pass.camera = self.camera # window.projection_matrix, window.view_matrix
self.geometry_pass.render()
## Shadowmaps
dirlight.shadowpass.camera = dirlight.camera
dirlight.shadowpass.render()
spotlight.shadowpass.camera = spotlight.camera
spotlight.shadowpass.render()
pointlight.shadowpass.position = pointlight.position
pointlight.shadowpass.render()
## Lighting
self.lighting_pass.cameraPos = self.camera.position
self.lighting_pass.gPosition = self.geometry_pass.gPosition
self.lighting_pass.gNormal = self.geometry_pass.gNormal
self.lighting_pass.gAlbedoSpecular = self.geometry_pass.gAlbedoSpecular
self.lighting_pass.gRoughness = self.geometry_pass.gRoughness
self.lighting_pass.gMetallic = self.geometry_pass.gMetallic
self.lighting_pass.gEmissive = self.geometry_pass.gEmissive
self.lighting_pass.render()
## Forward rendering
# - Copy depth from geometry pass
glBindFramebuffer(GL_READ_FRAMEBUFFER, self.geometry_pass.gBuffer)
glBindFramebuffer(GL_DRAW_FRAMEBUFFER,
self.forward_fbo) # write to default framebuffer
glBlitFramebuffer(0, 0, self.width, self.height, 0, 0, self.width,
self.height, GL_DEPTH_BUFFER_BIT, GL_NEAREST)
glBindFramebuffer(GL_READ_FRAMEBUFFER, self.lighting_pass.fbo)
glBlitFramebuffer(0, 0, self.width, self.height, 0, 0, self.width,
self.height, GL_COLOR_BUFFER_BIT, GL_NEAREST)
glBindFramebuffer(GL_FRAMEBUFFER, 0)
glEnable(GL_DEPTH_TEST)
glDepthFunc(GL_LEQUAL)
glDepthMask(GL_FALSE)
with fbo.bind(self.forward_fbo):
# draw skybox
glViewport(0, 0, self.width, self.height)
with program.use(self.skybox_program) as prog:
program.set_uniform(prog, 'projection', self.camera.projection)
sky_view = glm.mat4(glm.mat3(self.camera.view))
program.set_uniform(prog, 'view', sky_view)
program.set_uniform(prog, 'cameraPos', self.camera.position)
program.set_uniform(prog, 'skybox', 0)
program.set_uniform(prog, 'groundProjection', True)
glActiveTexture(GL_TEXTURE0 + 0)
glBindTexture(GL_TEXTURE_CUBE_MAP,
self.environment_pass.cubemap)
imdraw.cube(prog, flip=True)
glBindTexture(GL_TEXTURE_CUBE_MAP, 0)
glDepthMask(GL_TRUE)
## Tonemapping
self.tonemapping_pass.hdrimage = self.lighting_pass.beauty
self.tonemapping_pass.exposure = 0.0
self.tonemapping_pass.gamma = 2.2
self.tonemapping_pass.render()
# Render to screen
# ----------------
glViewport(0, 0, self.width, self.height)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glDisable(GL_DEPTH_TEST)
# draw to screen
imdraw.texture(self.tonemapping_pass.ldrimage,
(0, 0, self.width, self.height))
# debug
imdraw.texture(self.geometry_pass.gPosition, (0, 0, 90, 90))
imdraw.texture(self.geometry_pass.gNormal, (100, 0, 90, 90))
imdraw.texture(self.geometry_pass.gAlbedoSpecular, (200, 0, 90, 90),
shuffle=(0, 1, 2, -1))
imdraw.texture(self.geometry_pass.gAlbedoSpecular, (300, 0, 90, 90),
shuffle=(3, 3, 3, -1))
imdraw.texture(self.geometry_pass.gRoughness, (400, 0, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.texture(self.geometry_pass.gMetallic, (500, 0, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.texture(dirlight.shadowpass.texture, (0, 100, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.texture(spotlight.shadowpass.texture, (100, 100, 90, 90),
shuffle=(0, 0, 0, -1))
imdraw.cubemap(pointlight.shadowpass.cubemap, (200, 100, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.texture(self.environment_tex, (0, 200, 90, 90))
imdraw.cubemap(self.environment_pass.cubemap, (100, 200, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.cubemap(self.irradiance_pass.irradiance, (200, 200, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.cubemap(self.prefilter_pass.prefilter, (300, 200, 90, 90),
self.window.projection_matrix, self.window.view_matrix)
imdraw.texture(self.brdf_pass.brdflut, (400, 200, 90, 90))
imdraw.texture(self.lighting_pass.beauty, (0, 300, 90, 90))
# swap buffers
# ------------
self.window.swap_buffers()
GLFWViewer.poll_events()