<p>您还需要提供纹理坐标,否则OpenGL不知道如何将纹理映射到您的四边形-您也可以使用自动纹理坐标生成,但在您的情况下,仅指定坐标更简单。此外,还需要指定视区和投影</p>
<pre><code>class ClassThing:
def __init__(self):
self.Splash = True
def TexFromPNG(self, filename):
img = Image.open(filename)
img_data = numpy.array(list(img.getdata()), numpy.uint8)
texture = glGenTextures(1)
glPixelStorei(GL_UNPACK_ALIGNMENT,1)
glBindTexture(GL_TEXTURE_2D, texture)
# Texture parameters are part of the texture object, so you need to
# specify them only once for a given texture object.
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP)
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP)
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img.size[0], img.size[1], 0, GL_RGB, GL_UNSIGNED_BYTE, img_data)
return texture
def run(self):
glutInitDisplayMode(GLUT_RGBA)
glutInitWindowSize(256,224)
self.window = glutCreateWindow("GL")
glutReshapeFunc(self.reshape)
glutDisplayFunc(self.draw)
self.MainTex = glGenTextures(1)
self.SplashTex = self.TexFromPNG("Resources/Splash.png")
glutMainLoop()
def reshape(self, width, height):
self.width = width
self.height = height
glutPostRedisplay();
def draw(self):
glViewport(0, 0, self.width, self.height)
glClearDepth(1) # just for completeness
glClearColor(0,0,0,0)
glClear(GL_COLOR_BUFFER_BIT)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0, 1, 0, 1, -1, 1)
glMatrixMode(GL_MODELVIEW);
glLoadIdentity()
if self.Splash:
glBindTexture(GL_TEXTURE_2D, self.SplashTex)
else:
glBindTexture(GL_TEXTURE_2D, self.MainTex)
# it's a good idea to enable state right before you need it
# there's no such thing like global state intialization in
# OpenGL
glEnable(GL_TEXTURE_2D)
# vertex arrays must be enabled using glEnableClientState
glEnableClientState(GL_VERTEX_ARRAY)
glEnableClientState(GL_TEXTURE_COORD_ARRAY)
Varray = numpy.array([[0,0],[0,1],[1,1],[1,0]],numpy.float)
glVertexPointer(2,GL_FLOAT,0,Varray)
glTexCoordPointer(2,GL_FLOAT,0,Varray)
indices = [0,1,2,3]
glDrawElements(GL_QUADS,1,GL_UNSIGNED_SHORT,indices)
# This implies a glFinish, which includes a glFlush
glutSwapBuffers()
# GLUT initialization in program global, so initialize it on
# the process level. It might be
glutInit(sys.argv)
thing = ClassThing()
thing.run()
</code></pre>