使用PyOpenGL渲染纹理矩形 [英] Render a textured rectangle with PyOpenGL

问题描述

我正在使用PyOpenGL进行项目开发，目前正在尝试使OpenGL呈现一种初始屏幕.我对此的决定性解决方案是绘制带纹理的2D矩形.不幸的是，无论我做什么，似乎什么也没画，只是黑屏(所以我想画了一些东西，否则它将是一个透明的窗口，但这绝对不是我想要的).这是我班上的相关代码:

I'm working on a project using PyOpenGL, and I'm currently attempting to get OpenGL to render a kind of splash screen. My decided solution to this is to draw a textured 2D rectangle. Unfortunately, it appears that no matter what I do, nothing is ever drawn, I just get a black screen (So I guess something is drawn, otherwise it would be a transparent window, but it's definitely not what I want). Here is the pertinent code for my class:

class ClassThing:
    def __init__(self):
        self.Splash = True
        glutInit(sys.argv)

    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)
        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")
        glutDisplayFunc(self.draw)

        glClearColor(0,0,0,0)
        glEnable(GL_TEXTURE_2D)
        glEnable(GL_VERTEX_ARRAY)

        self.MainTex = glGenTextures(1)
        self.SplashTex = self.TexFromPNG("Resources/Splash.png")

        glutMainLoop()

    def draw(self):
        glClear(GL_COLOR_BUFFER_BIT)
        glLoadIdentity()
        if self.Splash:
            glBindTexture(GL_TEXTURE_2D, self.SplashTex)
        else:
            glBindTexture(GL_TEXTURE_2D, self.MainTex)

        glTexParameter(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
        glTexParameter(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER)
        Varray = numpy.array([[0,0],[0,256],[224,256],[224,0]],numpy.uint16)
        glVertexPointer(2,GL_SHORT,0,Varray)
        indices = [0,1,2,3]
        glDrawElements(GL_QUADS,1,GL_UNSIGNED_SHORT,indices)

        glFlush()
thing = ClassThing()
thing.run()

正如我所说，这使我全黑.感觉好像我可能缺少某种初始化或启用功能，但是我不知道还需要启用什么功能.

As I said, just that nets me with a totally black screen. It feels like I may be missing some kind of initialization or enabling, but I don't know what else I would need to enable.

顺便说一句，显然不赞成使用glVertexPointer，如果没有它，我将如何运行glDrawElements?您可以执行类似于纹理生成的某种顶点生成吗?

As an aside, apparently glVertexPointer is deprecated, how would I run glDrawElements without it? Is there some kind of vertex generation you can do similar to texture generation or what?

推荐答案

是因为您两次调用glGenTextures(1)吗?您已在TexFromPNG中将其分配给纹理，并在运行时将其分配给self.MainTex.

Could it be because you called glGenTextures(1) twice? You assigned it to texture in TexFromPNG and assigned it to self.MainTex in run.

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