PyOpenGL numpy纹理显示为纯色 [英] PyOpenGL numpy texture appears as solid color

问题描述

我试图在pygame中将numpy数组设置为OpenGl纹理.问题在于，只有第一个像素被用作纹理数据，而不是例如随机图案，而我每次都只能获得随机颜色.

I'm trying to set numpy arrays as OpenGl textures in pygame. The problem is that only the first pixel is taken as texture data and instead of a random pattern (for example) I only get a random color every time.

import pygame
from pygame.locals import *

from OpenGL.GL import *
from OpenGL.GLU import *

import numpy as np

#Settings
width = 200
height = 300
resolution = (800,600)
texture_data = np.random.randint(256,size=(height, width, 3))

#pygame init
pygame.init()
gameDisplay = pygame.display.set_mode(resolution,OPENGL)

#OpenGL init
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0,resolution[0],0,resolution[1],-1,1)
glMatrixMode(GL_MODELVIEW)
glDisable(GL_DEPTH_TEST)
glClearColor(0.0,0.0,0.0,0.0)
glEnable(GL_TEXTURE_2D)

#Set texture
texture = glGenTextures(1)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
glBindTexture(GL_TEXTURE_2D, texture)
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_MAG_FILTER, GL_NEAREST)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture_data)
glGenerateMipmap(GL_TEXTURE_2D)

glActiveTexture(GL_TEXTURE0)

#Clean start
glClear(GL_COLOR_BUFFER_BIT)
glLoadIdentity()

#draw rectangle
glTranslatef(300,200,0)
glBegin(GL_QUADS)
glVertex2f(0,0)
glVertex2f(0,height)
glVertex2f(width,height)
glVertex2f(width,0)
glEnd()
glFlush()

#game loop until exit
gameExit = False
while not gameExit:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            gameExit = True

    #throttle
    pygame.time.wait(100)

推荐答案

正如genpfault指出的那样，我缺少纹理坐标.我需要将它们添加到矩形绘图部分.

As pointed out by genpfault I was missing texture coordinates. I needed to add them to the rectangle drawing part.

#draw rectangle
glTranslatef(300,200,0)
glBegin(GL_QUADS)

glTexCoord(0,0)
glVertex2f(0,0)

glTexCoord(0,1)
glVertex2f(0,height)

glTexCoord(1,1)
glVertex2f(width,height)

glTexCoord(1,0)
glVertex2f(width,0)

glEnd()
glFlush()

如果您不了解纹理映射的工作原理，请阅读以下内容:

Read this if you are lost on how texture mapping works:

OpenGL编程指南-第9章纹理映射

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