我将尝试使用Pillow加载图像在OpenGL中绘制2D图像,但是当我在OpenGL中渲染时,图像会变形。
这是原始图像:
这是原始图像:
Loading.png
这是代码:
# -*- coding: utf-8 -*-
import glfw
from OpenGL.GL import *
if not glfw.init():
sys.exit()
glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 1)
glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 4)
window = glfw.create_window(800, 600, "Hello World", None, None)
if not window:
sys.exit()
glfw.make_context_current(window)
glEnable(GL_BLEND)
glClearColor(1.0/255.0*68.0, 1.0/255.0*68.0, 1.0/255.0*68.0, 1.0)
glClear(GL_COLOR_BUFFER_BIT)
glViewport(0, 0, 800, 600)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0.0, 800.0, 600.0, 0.0, 0.0, 1.0)
import numpy
from PIL import Image # pillow
def ReadTexture( filename):
# PIL can open BMP, EPS, FIG, IM, JPEG, MSP, PCX, PNG, PPM
# and other file types. We convert into a texture using GL.
print('trying to open', filename)
try:
image = Image.open(filename)
except IOError as ex:
print('IOError: failed to open texture file')
message = template.format(type(ex).__name__, ex.args)
print(message)
return -1
print('opened file: size=', image.size, 'format=', image.format)
imageData = numpy.array(list(image.getdata()), numpy.uint8)
textureID = glGenTextures(1)
glPixelStorei(GL_UNPACK_ALIGNMENT, 4)
glBindTexture(GL_TEXTURE_2D, textureID)
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, image.size[0], image.size[1],
0, GL_RGB, GL_UNSIGNED_BYTE, imageData)
image.close()
return textureID
import sys
def get_user_input(str):
if sys.version_info[0] < 3:
return raw_input(str)
else:
return input(str)
print("started")
texture_id = ReadTexture("loading.png")
while True:
glfw.poll_events()
glClear(GL_COLOR_BUFFER_BIT)
glEnable(GL_TEXTURE_2D)
glBindTexture(GL_TEXTURE_2D, texture_id)
glBegin(GL_QUADS)
glTexCoord2f(0, 0)
glVertex2f(0,0)
glTexCoord2f(0, 1)
glVertex2f(0,100)
glTexCoord2f(1, 1)
glVertex2f(100,100)
glTexCoord2f(1, 0)
glVertex2f(100,0)
glEnd()
glDisable(GL_TEXTURE_2D)
glfw.swap_buffers(window)
glfw.destroy_window(window)
glfw.terminate()
get_user_input("PRESS ENTER")
结果
正如您所见,结果是一张歪斜的图片,我不知道为什么会发生这种情况,而且我也看不出代码有什么问题。
编辑:可以确认在Python 2.7和3.8中存在相同的问题。