def main():
draw_mode = 1
global lastFrame, planeVAO, planeVBO
# Init GLFW
glfw.setErrorCallback(error_callback)
glfw.init()
glfw.windowHint(glfw.CONTEXT_VERSION_MAJOR, 3)
glfw.windowHint(glfw.CONTEXT_VERSION_MINOR, 3)
glfw.windowHint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
# glfw.windowHint(glfw.RESIZABLE, gl.FALSE)
glfw.windowHint(glfw.OPENGL_FORWARD_COMPAT, 1)
window = glfw.createWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL")
if window is None:
print('could not open window.')
glfw.terminate()
sys.exit()
inputMap = InputMap()
window.makeContextCurrent()
window.setKeyCallback(inputMap.key_callback)
window.setCursorPosCallback(inputMap.mouse_callback)
#window.setScrollCallback(inputMap.scroll_callback)
window.setInputMode(glfw.CURSOR, glfw.CURSOR_DISABLED)
# some versions of glfw cause an opengl error when creating a window, make sure that's ignored.
gl.init()
err = gl.getError()
if err:
print("WINDOW OPEN ERROR:", err)
# Define the viewport dimensions
VP_WIDTH, VP_HEIGHT = window.getFramebufferSize()
gl.viewport(0, 0, VP_WIDTH, VP_HEIGHT)
# Setup some OpenGL options
gl.enable(gl.DEPTH_TEST);
#Setup and compile our shaders
shaderGeometryPass = Shader(G_BUFFER_VERT, G_BUFFER_FRAG);
shaderLightingPass = Shader(DEFERRED_SHADING_VERT, DEFERRED_SHADING_FRAG);
shaderLightBox = Shader(DEFERRED_LIGHT_BOX_VERT, DEFERRED_LIGHT_BOX_FRAG);
gPosition, gNormal, gAlbedoSpec = gl.genTextures(3)
shaderLightingPass.use()
shaderLightingPass.uniforms.gPosition = gNormal
shaderLightingPass.uniforms.gNormal = gPosition
shaderLightingPass.uniforms.gAlbedoSpec = gAlbedoSpec
# "learningopengl/resources/objects/cyborg/cyborg.obj"
cyborg = Model("learningopengl/resources/objects/cyborg/cyborg.obj")
objectPositions = [
Vec3(-3.0, -3.0, -3.0),
Vec3( 0.0, -3.0, -3.0),
Vec3( 3.0, -3.0, -3.0),
Vec3(-3.0, -3.0, 0.0),
Vec3( 0.0, -3.0, 0.0),
Vec3( 3.0, -3.0, 0.0),
Vec3(-3.0, -3.0, 3.0),
Vec3( 0.0, -3.0, 3.0),
Vec3( 3.0, -3.0, 3.0)
]
NR_LIGHTS = 32
lightPositions = (Vec3 * NR_LIGHTS)()
lightColors = (Vec3 * NR_LIGHTS)()
for i in range(NR_LIGHTS):
lightPositions[i].x = random.uniform(-3.0, 3.0)
lightPositions[i].y = random.uniform(-4.0, 2.0)
lightPositions[i].z = random.uniform(-3.0, 3.0)
lightColors[i].x = random.uniform(0.5, 1.0)
lightColors[i].y = random.uniform(0.5, 1.0)
lightColors[i].z = random.uniform(0.5, 1.0)
# set up the G-buffer
# 3 textures: p
# 1. Positions (RGB)
# 2. Color (RGB) + Specular (A)
# 3. Normal (RGB)
gBuffer = gl.genFramebuffers(1)[0]
gl.bindFramebuffer(gl.FRAMEBUFFER, gBuffer)
# set up the position buffer
gl.bindTexture(gl.TEXTURE_2D, gPosition)
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB16F, VP_WIDTH, VP_HEIGHT, 0, gl.RGB, gl.FLOAT, None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, gPosition, 0)
# set up the normal buffer
gl.bindTexture(gl.TEXTURE_2D, gNormal);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, VP_WIDTH, VP_HEIGHT, 0, gl.RGB, gl.FLOAT,None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.TEXTURE_2D, gNormal, 0)
# set up the color + specular buffer
gl.bindTexture(gl.TEXTURE_2D, gAlbedoSpec);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, VP_WIDTH, VP_HEIGHT, 0, gl.RGBA, gl.FLOAT, None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT2, gl.TEXTURE_2D, gAlbedoSpec, 0)
# - Tell OpenGL which color attachments we'll use (of this framebuffer) for rendering
attachments = [gl.COLOR_ATTACHMENT0, gl.COLOR_ATTACHMENT1, gl.COLOR_ATTACHMENT2]
gl.drawBuffers(attachments)
# - Create and attach depth buffer (renderbuffer)
rboDepth = gl.genRenderbuffers(1)[0]
gl.bindRenderbuffer(gl.RENDERBUFFER, rboDepth)
gl.renderbufferStorage(gl.RENDERBUFFER,gl.DEPTH_COMPONENT, VP_WIDTH, VP_HEIGHT);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, rboDepth)
# - Finally check if framebuffer is complete
if gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE:
print("Framebuffer not complete!")
gl.bindFramebuffer(gl.FRAMEBUFFER, 0)
gl.clearColor(0.0, 0.0, 0.0, 0.0)
# Game loop
while not window.shouldClose():
# Set frame time
currentFrame = time.perf_counter()
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
# Check and call events
inputMap.begin_frame()
glfw.pollEvents()
input = inputMap.get_input()
camera.processInput(input, 1.0/30.0)
gl.bindFramebuffer(gl.FRAMEBUFFER, gBuffer)
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
# TODO: use camera.zoom
# 1. Geometry Pass: render scene's geometry/color data into gbuffer
projection = Mat4.Perspective(45.0, float(SCR_WIDTH)/float(SCR_HEIGHT), 0.1, 100.0)
view = camera.getViewMatrix()
model = Mat4.Identity()
shaderGeometryPass.use()
shaderGeometryPass.uniforms.projection = projection
shaderGeometryPass.uniforms.view = view
for objectPosition in objectPositions:
model = Mat4.Translation(objectPosition) * Mat4.Scale(0.25)
shaderGeometryPass.uniforms.model = model
cyborg.draw(shaderGeometryPass)
gl.bindFramebuffer(gl.FRAMEBUFFER, 0)
gl.polygonMode(gl.FRONT_AND_BACK, gl.FILL)
# 2. Lighting Pass: calculate lighting by iterating over a screen filled quad pixel-by-pixel using the gbuffer's content.
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
shaderLightingPass.use()
shaderLightingPass.uniforms.gPosition = gPosition
shaderLightingPass.uniforms.gNormal = gNormal
shaderLightingPass.uniforms.gAlbedoSpec = gAlbedoSpec
# Also send light relevant uniforms
for i, lightPosition in enumerate(lightPositions):
shaderLightingPass.uniforms.lights[i].Position = lightPosition
shaderLightingPass.uniforms.lights[i].Color = lightColors[i]
# Update attenuation parameters and calculate radius
constant = 1.0
linear = shaderLightingPass.uniforms.lights[i].Linear = 0.7
quadratic = shaderLightingPass.uniforms.lights[i].Quadratic = 1.8
# Then calculate radius of light volume/sphere
lightThreshold = 5.0 # 5 / 256
maxBrightness = max(max(lightColors[i].r, lightColors[i].g), lightColors[i].b)
radius = (-linear + math.sqrt(linear * linear - 4 * quadratic * (constant - (256.0 / lightThreshold) * maxBrightness))) / (2 * quadratic)
shaderLightingPass.uniforms.lights[i].Radius = radius
shaderLightingPass.uniforms.viewPos = camera.position
if window.getKey(glfw.KEY_1):
draw_mode = 1
if window.getKey(glfw.KEY_2):
draw_mode = 2
if window.getKey(glfw.KEY_3):
draw_mode = 3
if window.getKey(glfw.KEY_4):
draw_mode = 4
if window.getKey(glfw.KEY_5):
draw_mode = 5
# print("SETTING DRAW MODE:", draw_mode)
try:
shaderLightingPass.uniforms.draw_mode = draw_mode
except:
pass
RenderQuad()
# 2.5. Copy content of geometry's depth buffer to default framebuffer's depth buffer
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, gBuffer);
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, 0); # Write to default framebuffer
gl.blitFramebuffer(0, 0, VP_WIDTH, VP_HEIGHT, 0, 0, VP_WIDTH, VP_HEIGHT, gl.DEPTH_BUFFER_BIT, gl.NEAREST);
gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
# 3. Render lights on top of scene, by blitting
shaderLightBox.use()
shaderLightBox.uniforms.projection = projection
# glUniformMatrix4fv(glGetUniformLocation(shaderLightBox.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
shaderLightBox.uniforms.view = view
# glUniformMatrix4fv(glGetUniformLocation(shaderLightBox.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
for i, lightPosition in enumerate(lightPositions):
model = Mat4.Translation(lightPosition) * Mat4.Scale(0.25)
shaderLightBox.uniforms.model = model
shaderLightBox.uniforms.lightColor = lightColors[i]
RenderCube()
# Swap the buffers
window.swapBuffers()
return 0
def main():
glfw.setErrorCallback(error_callback)
glfw.init()
glfw.windowHint(glfw.CONTEXT_VERSION_MAJOR, 3)
glfw.windowHint(glfw.CONTEXT_VERSION_MINOR, 3)
glfw.windowHint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
# glfw.windowHint(glfw.RESIZABLE, gl.FALSE)
glfw.windowHint(glfw.OPENGL_FORWARD_COMPAT, 1)
if ENABLE_MULTISAMPLE:
glfw.windowHint(glfw.SAMPLES, 4)
window = glfw.createWindow(WIDTH, HEIGHT, "LearnOpenGL")
if window is None:
print('could not open window.')
glfw.terminate()
sys.exit()
window.makeContextCurrent()
# window.setInputMode(glfw.CURSOR, glfw.CURSOR_DISABLED)
window.setKeyCallback(key_callback)
gl.init()
err = gl.getError()
if err:
print("WINDOW OPEN ERROR:", err)
framebuffer_width, framebuffer_height = window.getFramebufferSize()
# Framebuffers
framebuffer = gl.genFramebuffers(1)[0]
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
# Create a color attachment texture
textureColorbuffer = generateAttachmentTexture(gl.RGB, framebuffer_width, framebuffer_height);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureColorbuffer, 0)
# set up the position buffer
gPosition = gl.genTextures(1)[0]
gl.bindTexture(gl.TEXTURE_2D, gPosition)
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB16F, framebuffer_width, framebuffer_height, 0, gl.RGB, gl.FLOAT, None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.TEXTURE_2D, gPosition, 0)
# set up the normal buffer
gNormal = gl.genTextures(1)[0]
gl.bindTexture(gl.TEXTURE_2D, gNormal)
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB16F, framebuffer_width, framebuffer_height, 0, gl.RGB, gl.FLOAT, None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT2, gl.TEXTURE_2D, gNormal, 0)
gLight = gl.genTextures(1)[0]
gl.bindTexture(gl.TEXTURE_2D, gLight)
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB16F, framebuffer_width, framebuffer_height, 0, gl.RGB, gl.FLOAT, None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT3, gl.TEXTURE_2D, gLight, 0)
# - Tell OpenGL which color attachments we'll use (of this framebuffer) for rendering
attachments = [gl.COLOR_ATTACHMENT0, gl.COLOR_ATTACHMENT1, gl.COLOR_ATTACHMENT2]
gl.drawBuffers(attachments)
gDepth = gl.genTextures(1)[0]
gl.bindTexture(gl.TEXTURE_2D, gDepth)
gl.texImage2D(gl.TEXTURE_2D, 0, gl.DEPTH24_STENCIL8, framebuffer_width, framebuffer_height, 0, gl.DEPTH_STENCIL, gl.UNSIGNED_INT_24_8, None)
# gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB16F, framebuffer_width, framebuffer_height, 0, gl.RGB, gl.FLOAT, None)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.TEXTURE_2D, gDepth, 0)
# Create a renderbuffer object for depth and stencil attachment (we won't be sampling these)
# rbo = gl.genRenderbuffers(1)[0]
# gl.bindRenderbuffer(gl.RENDERBUFFER, rbo)
# gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH24_STENCIL8, framebuffer_width, framebuffer_height); # Use a single renderbuffer object for both a depth AND stencil buffer.
# gl.bindRenderbuffer(gl.RENDERBUFFER, 0);
# gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, rbo) # Now actually attach it
# Now that we actually created the framebuffer and added all attachments we want to check if it is actually complete now
if gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE:
print("ERROR::FRAMEBUFFER:: Framebuffer is not complete!")
gl.bindFramebuffer(gl.FRAMEBUFFER, 0)
deferred_textures = {
'screenTexture': textureColorbuffer,
'normalTexture': gNormal,
'positionTexture': gPosition,
'lightTexture': gLight,
'depthTexture': gDepth
}
scene = Scene()
camera = Camera(scene=scene)
quad_scene = Scene()
quad_camera = Camera(scene=quad_scene)
light_scene = Scene()
light_camera = Camera(scene=light_scene, clear=0)
light_camera.clear = gl.COLOR_BUFFER_BIT
light_camera.clear_color = (0.0, 0.0, 0.0, 0.0)
light_camera.projection_matrix = camera.projection_matrix = Mat4.Perspective(45.0, framebuffer_width/framebuffer_height, 0.1, 100.0)
light_camera.view_matrix = camera.view_matrix = Mat4.LookAt(Vec3(math.cos(time.clock()), 1.0, math.sin(time.clock())) *15.0, Vec3(0.0, 0.0, 0.0), Vec3(0.0, 1.0, 0.0))
# light volume model
light_volume_data = objloader.load_obj(os.path.join("springtangent-model-files", "lightsphere", "lightsphere.obj"), calculate_normals=True)
light_volume_model = Model.FromJSON(light_volume_data, PointLightInstanceData, PlateInstance)
# other models
armored_plate_data = objloader.load_obj(os.path.join("springtangent-model-files", "armored_plate.75.75.decimation_test7.obj"), calculate_normals=True)
armored_plate_model = Model.FromJSON(armored_plate_data, InstanceData, PlateInstance)
plane_plate_data = objloader.load_obj(os.path.join("springtangent-model-files", "plane_plate.75.75.decimation_test.00.obj"), calculate_normals=True)
plane_plate_model = Model.FromJSON(plane_plate_data, InstanceData, PlateInstance)
angled_plate_data = objloader.load_obj(os.path.join("springtangent-model-files", "angled_plate_plane.75.25..25.decimated.obj"), calculate_normals=True)
angled_plate_model = Model.FromJSON(angled_plate_data, InstanceData, PlateInstance)
angled_to_rounded_data = objloader.load_obj(os.path.join("springtangent-model-files", "angled_to_round_adapter.75.25.25", "angled_to_rounded_adapter.75.25.25.decimated.obj"), calculate_normals=True)
angled_to_rounded_model = Model.FromJSON(angled_to_rounded_data, InstanceData, PlateInstance)
models = [armored_plate_model, plane_plate_model, angled_plate_model, angled_to_rounded_model]
deferred_shader = ShaderProgram(GBUFFER_VERT, GBUFFER_FRAG)
deferred_light_shader = ShaderProgram(GBUFFER_LIGHT_VERT, GBUFFER_LIGHT_FRAG)
for mesh in light_volume_model.meshes:
mesh.shader = deferred_light_shader
mesh.material = deferred_textures
# replace the shader with the deferred shader in all meshes
for model in models:
for mesh in model.meshes:
mesh.shader = deferred_shader
# set up the data for the instances.
# 30 x 30 array of tiles, which are randomly selected among the above models
n = 30
instances = {}
for i in range(n):
for j in range(n):
r = random.choice(range(4))
transform = Mat4.Translation(Vec3((i-n//2) * 2, 0.0, (j-n//2) * 2)) * Mat4.Rotation(math.pi/2.0 * r, Vec3(0.0, 1.0, 0.0))
instance = scene.add(random.choice(models), InstanceData(transform))
instance.r = r
instances[i,j] = instance
nlights = 400
for i in range(nlights):
transform = Mat4.Translation(Vec3(random.uniform(-n/2, n/2), random.uniform(-1.0, 1.0), random.uniform(-n/2,n/2))) * Mat4.Scale(random.uniform(2.0, 10.0))
instance = light_scene.add(light_volume_model, PointLightInstanceData(transform, diffuse=Vec3(1.0, 1.0, 1.0), linear_attenuation=0.1, quadratic_attenutation=0.01))
# full screen rectangle
class QuadVert(Structure):
_fields_ = [
('position', Vec2),
('texcoord', Vec2)
]
quad_points = Vector(QuadVert)
quad_points.append(QuadVert(Vec2(-1.0, 1.0), Vec2(0.0, 1.0)))
quad_points.append(QuadVert(Vec2(-1.0, -1.0), Vec2(0.0, 0.0)))
quad_points.append(QuadVert(Vec2( 1.0, -1.0), Vec2(1.0, 0.0)))
quad_points.append(QuadVert(Vec2( 1.0, 1.0), Vec2(1.0, 1.0)))
quad_indices = Vector(c_ubyte)
quad_indices.append(0)
quad_indices.append(1)
quad_indices.append(2)
quad_indices.append(0)
quad_indices.append(2)
quad_indices.append(3)
quad_attribs = BufferAttribs(sizeof(QuadVert))
quad_attribs.add(BufferAttribs.POSITION_INDEX, 2, gl.FLOAT, gl.FALSE, QuadVert.position.offset)
quad_attribs.add(BufferAttribs.TEXCOORD_INDEX, 2, gl.FLOAT, gl.FALSE, QuadVert.texcoord.offset)
quad_shader = ShaderProgram(FRAMEBUFFER_VERT, FRAMEBUFFER_FRAG)
quad_draw_call = DrawCall(gl.UNSIGNED_BYTE, gl.TRIANGLES, 0, len(quad_indices))
quad_material = deferred_textures
quad_mesh = Mesh(quad_shader, quad_draw_call, quad_material)
quad_model = Model(quad_indices.get_data(), quad_points.get_data(), quad_attribs, [quad_mesh], InstanceData, PlateInstance)
# quad_instances = ModelInstances(quad_model)
quad_instance = quad_scene.add(quad_model, InstanceData(Mat4.Identity()))
gl.enable(gl.MULTISAMPLE)
t0 = time.perf_counter()
frames = 0
while not window.shouldClose():
glfw.pollEvents()
t = time.perf_counter()
# render scene to gbuffer
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer)
gl.enable(gl.DEPTH_TEST)
gl.depthFunc(gl.LEQUAL)
gl.enable(gl.CULL_FACE)
gl.cullFace(gl.BACK)
# set up gbuffer for writing
attachments = [gl.COLOR_ATTACHMENT0, gl.COLOR_ATTACHMENT1, gl.COLOR_ATTACHMENT2]
gl.drawBuffers(attachments)
framebuffer_width, framebuffer_height = window.getFramebufferSize()
light_camera.view_matrix = camera.view_matrix = Mat4.LookAt(Vec3(math.cos(time.clock() * 0.1), 1.0, math.sin(time.clock() * 0.1)) *15.0, Vec3(0.0, 0.0, 0.0), Vec3(0.0, 1.0, 0.0))
viewport = (0, 0, framebuffer_width, framebuffer_height)
camera.render_to_viewport(viewport)
# render lights to gbuffer
gl.drawBuffer(gl.COLOR_ATTACHMENT3)
gl.depthFunc(gl.GREATER)
gl.enable(gl.CULL_FACE)
gl.cullFace(gl.FRONT)
gl.enable(gl.BLEND)
gl.blendEquation(gl.FUNC_ADD)
gl.blendFunc(gl.ONE, gl.ONE)
light_camera.render_to_viewport(viewport)
err = gl.getError()
if err:
print("ERROR:", err)
if TEST_ANIMATION:
for i in range(n):
for j in range(n):
instance = instances[i,j]
enabled = True # math.sin(i+j+t*10.0) > -0.8
# instance.set_enabled(enabled)
if enabled:
y = (math.sin(t+i) + math.cos(t+j)) * 0.25
transform = Mat4.Translation(Vec3((i-n//2) * 2, y, (j-n//2) * 2)) * Mat4.Rotation(math.pi/2.0 * instance.r, Vec3(0.0, 1.0, 0.0))
instance.model_matrix = transform
# render quad with texture
gl.bindFramebuffer(gl.FRAMEBUFFER, 0)
gl.disable(gl.BLEND)
gl.disable(gl.CULL_FACE)
gl.disable(gl.DEPTH_TEST) # We don't care about depth information when rendering a single quad
quad_camera.clear_color = (1.0, 1.0, 1.0, 1.0)
quad_camera.clear = gl.COLOR_BUFFER_BIT
quad_camera.render_to_viewport(viewport)
scene.update_instances()
quad_scene.update_instances()
light_scene.update_instances()
window.swapBuffers()
frames += 1
if not frames % 100:
print("FRAME RATE:", float(frames)/(time.perf_counter() - t0))