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textured_render_uv.py
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textured_render_uv.py
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import math
import time
from pathlib import Path
import cv2
import glfw
import numpy as np
import trimesh
from OpenGL.GL import *
from OpenGL.GL.shaders import compileProgram, compileShader
res = (1800, 1000)
max_fps = 60
near = 0.1
far = 100.0
fov = 0.8
mov_speed = 0.5
rot_speed = 0.005
gizmo_and_grid = False
shader_dir = Path(__file__).parent / "shaders"
class Window:
def __init__(self):
glfw.init()
self.window_handle = glfw.create_window(*res, "Smoothable Neural Texture", None, None)
if not self.window_handle:
raise ValueError("Unable to create GLFW window.")
glfw.make_context_current(self.window_handle)
glfw.set_key_callback(self.window_handle, self.key_callback)
glfw.set_input_mode(self.window_handle, glfw.CURSOR, glfw.CURSOR_DISABLED)
self.display_shader = compileProgram(
compileShader((shader_dir / "display.vert").read_text(), GL_VERTEX_SHADER),
compileShader((shader_dir / "display.frag").read_text(), GL_FRAGMENT_SHADER)
)
self.mesh_shader = compileProgram(
compileShader((shader_dir / "mesh.vert").read_text(), GL_VERTEX_SHADER),
compileShader((shader_dir / "mesh.frag").read_text(), GL_FRAGMENT_SHADER)
)
self.color, self.depth = glGenTextures(2)
glBindTexture(GL_TEXTURE_2D, self.color)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, *res, 0, GL_RGBA, GL_FLOAT, None)
glBindTexture(GL_TEXTURE_2D, self.depth)
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, *res, 0, GL_DEPTH_COMPONENT, GL_FLOAT, None)
self.fbo = glGenFramebuffers(1)
self.setup_mesh()
self.is_recording = False
self.recorded_frames = []
self.frames = 0
self.camX = 0.0
self.camY = 0.0
self.camZ = 2.0
self.camPitch = 0.0
self.camYaw = 0.0
self.prevCursorX = 0.0
self.prevCursorY = 0.0
def setup_mesh(self):
mesh = trimesh.load_mesh(Path(__file__).parent.parent / "data" / "textured" / "fish" / "model.obj")
vertices = (mesh.vertices - mesh.bounding_box.centroid) * (2 / np.max(mesh.bounding_box.extents))
self.num_faces = mesh.faces.shape[0]
self.vao = glGenVertexArrays(1)
vertex_pos_buf, vertex_uv_buf, index_buf = glGenBuffers(3)
glBindVertexArray(self.vao)
position_attr = glGetAttribLocation(self.mesh_shader, "position")
glBindBuffer(GL_ARRAY_BUFFER, vertex_pos_buf)
glEnableVertexAttribArray(position_attr)
glVertexAttribPointer(position_attr, 3, GL_FLOAT, GL_FALSE, 0, ctypes.c_void_p(0))
glBufferData(GL_ARRAY_BUFFER, vertices.astype(np.float32), GL_STATIC_DRAW)
glBindBuffer(GL_ARRAY_BUFFER, 0)
uv_attr = glGetAttribLocation(self.mesh_shader, "uv")
glBindBuffer(GL_ARRAY_BUFFER, vertex_uv_buf)
glEnableVertexAttribArray(uv_attr)
glVertexAttribPointer(uv_attr, 2, GL_FLOAT, GL_FALSE, 0, ctypes.c_void_p(0))
glBufferData(GL_ARRAY_BUFFER, mesh.visual.uv.astype(np.float32), GL_STATIC_DRAW)
glBindBuffer(GL_ARRAY_BUFFER, 0)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buf)
glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh.faces.astype(np.uint32), GL_STATIC_DRAW)
glBindVertexArray(0)
def run(self):
while not glfw.window_should_close(self.window_handle):
start_time = time.perf_counter()
self.move_camera()
glBindFramebuffer(GL_FRAMEBUFFER, self.fbo)
self.render()
glBindFramebuffer(GL_FRAMEBUFFER, 0)
if self.is_recording:
self.recorded_frames.append(self.download_image())
# Display self.color on screen.
glViewport(0, 0, *res)
glClear(GL_COLOR_BUFFER_BIT)
glDisable(GL_CULL_FACE)
glDisable(GL_DEPTH_TEST)
glUseProgram(self.display_shader)
glActiveTexture(GL_TEXTURE0)
glBindTexture(GL_TEXTURE_2D, self.color)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
glBegin(GL_QUADS)
glTexCoord2f(0, 0)
glVertex2f(-1, -1)
glTexCoord2f(0, 1)
glVertex2f(1, -1)
glTexCoord2f(1, 1)
glVertex2f(1, 1)
glTexCoord2f(1, 0)
glVertex2f(-1, 1)
glEnd()
glBindTexture(GL_TEXTURE_2D, 0)
glUseProgram(0)
glfw.swap_buffers(self.window_handle)
glfw.poll_events()
render_time = time.perf_counter() - start_time
if render_time < (1 / max_fps):
time.sleep((1 / max_fps) - render_time)
glfw.terminate()
def move_camera(self):
delta = 1 / max_fps
if glfw.get_key(self.window_handle, glfw.KEY_W) == glfw.PRESS:
self.camX += math.sin(self.camYaw) * delta * mov_speed
self.camZ -= math.cos(self.camYaw) * delta * mov_speed
if glfw.get_key(self.window_handle, glfw.KEY_S) == glfw.PRESS:
self.camX -= math.sin(self.camYaw) * delta * mov_speed
self.camZ += math.cos(self.camYaw) * delta * mov_speed
if glfw.get_key(self.window_handle, glfw.KEY_A) == glfw.PRESS:
self.camX -= math.cos(self.camYaw) * delta * mov_speed
self.camZ -= math.sin(self.camYaw) * delta * mov_speed
if glfw.get_key(self.window_handle, glfw.KEY_D) == glfw.PRESS:
self.camX += math.cos(self.camYaw) * delta * mov_speed
self.camZ += math.sin(self.camYaw) * delta * mov_speed
if glfw.get_key(self.window_handle, glfw.KEY_SPACE) == glfw.PRESS:
self.camY += delta * mov_speed
if glfw.get_key(self.window_handle, glfw.KEY_LEFT_SHIFT) == glfw.PRESS:
self.camY -= delta * mov_speed
cursorX, cursorY = glfw.get_cursor_pos(self.window_handle)
# All kind of jitter happens in the first few frames.
self.frames += 1
if self.frames > 10:
self.camPitch = min(
max(self.camPitch - (cursorY - self.prevCursorY) * rot_speed, -math.pi / 2),
math.pi / 2
)
self.camYaw += (cursorX - self.prevCursorX) * rot_speed
self.prevCursorX = cursorX
self.prevCursorY = cursorY
def render(self):
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self.color, 0)
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, self.depth, 0)
glViewport(0, 0, *res)
glClearColor(0, 0, 0, 0)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glEnable(GL_DEPTH_TEST)
glEnable(GL_CULL_FACE)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
aspectRatio = res[0] / res[1]
glFrustum(-near * fov, near * fov, -near * fov / aspectRatio, near * fov / aspectRatio, near, far)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glRotated(math.degrees(self.camPitch), -1, 0, 0)
glRotated(math.degrees(self.camYaw), 0, 1, 0)
glTranslated(-self.camX, -self.camY, -self.camZ)
if gizmo_and_grid:
self.render_gizmo()
self.render_grid()
self.render_mesh()
@staticmethod
def render_gizmo():
glLineWidth(2)
glBegin(GL_LINES)
glColor3d(1, 0, 0)
glVertex3d(0, 0, 0)
glVertex3d(1, 0, 0)
glColor3d(0, 1, 0)
glVertex3d(0, 0, 0)
glVertex3d(0, 1, 0)
glColor3d(0, 0, 1)
glVertex3d(0, 0, 0)
glVertex3d(0, 0, 1)
glEnd()
@staticmethod
def render_grid():
n_lines = 5
line_spacing = 1
glColor3d(0.5, 0.5, 0.5)
glLineWidth(1)
glBegin(GL_LINES)
for i in range(-n_lines, n_lines + 1):
if i == 0:
# Leave gaps for the gizmo.
# X
glVertex3d(-n_lines * line_spacing, 0, i * line_spacing)
glVertex3d(0, 0, i * line_spacing)
glVertex3d(1, 0, i * line_spacing)
glVertex3d(n_lines * line_spacing, 0, i * line_spacing)
# Z
glVertex3d(i * line_spacing, 0, -n_lines * line_spacing)
glVertex3d(i * line_spacing, 0, 0)
glVertex3d(i * line_spacing, 0, 1)
glVertex3d(i * line_spacing, 0, n_lines * line_spacing)
else:
# X
glVertex3d(-n_lines * line_spacing, 0, i * line_spacing)
glVertex3d(n_lines * line_spacing, 0, i * line_spacing)
# Z
glVertex3d(i * line_spacing, 0, -n_lines * line_spacing)
glVertex3d(i * line_spacing, 0, n_lines * line_spacing)
glEnd()
def render_mesh(self):
glPushMatrix()
glRotated(-90, 1, 0, 0)
glUseProgram(self.mesh_shader)
glBindVertexArray(self.vao)
glDrawElements(GL_TRIANGLES, self.num_faces * 3, GL_UNSIGNED_INT, ctypes.c_void_p(0))
glBindVertexArray(0)
glUseProgram(0)
glPopMatrix()
def key_callback(self, window, key, scancode, action, mods):
if action == glfw.PRESS:
if key == glfw.KEY_ESCAPE:
glfw.set_window_should_close(self.window_handle, True)
elif key == glfw.KEY_C:
d = Path(__file__).parent.parent / "results" / "textured" / "fish" / "screenshots" / "uv"
i = (max((int(f.stem) for f in d.iterdir()), default=-1) + 1) if d.exists() else 0
self.save_capture(d / f"{i:05}.png", self.download_image())
elif key == glfw.KEY_R:
if self.is_recording:
d = Path(__file__).parent.parent / "results" / "textured" / "fish" / "moving" / "uv"
for i, frame in enumerate(self.recorded_frames):
self.save_capture(d / f"{i:05}.png", frame)
self.recorded_frames.clear()
self.is_recording = not self.is_recording
@staticmethod
def save_capture(file, cap):
file.parent.mkdir(parents=True, exist_ok=True)
cv2.imwrite(str(file), (cv2.cvtColor(cap, cv2.COLOR_RGBA2BGRA).clip(0, 1) * 65535).astype(np.uint16))
def download_image(self):
glBindTexture(GL_TEXTURE_2D, self.color)
image = glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT)
glBindTexture(GL_TEXTURE_2D, 0)
return np.flip(np.reshape(image, (res[1], res[0], 4)), 0)
if __name__ == "__main__":
Window().run()