python - pyopengl 上的 gldrawpixels 没有画任何东西？

Question

我创建要使用 glDrawPixels 绘制的像素缓冲区。代码运行正常，pygame 窗口出现。但是什么都没有画出来，只显示了一个空白的白色窗口。即使我更改缓冲区的值，它也不会绘制任何东西。

import pygame

from OpenGL.GL import *

#initiliaze pixel buffers
buffer = bytearray(800 * 600 * 3)

for i in range(800 * 600 * 3):
    buffer[i] = 25

def main():
    pygame.init()
    display = (800,600)
    pygame.display.set_mode(display, pygame.DOUBLEBUF| pygame.OPENGL)

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()

        glClear(GL_COLOR_BUFFER_BIT)
        glDrawPixels(800, 600, GL_RGB, GL_UNSIGNED_BYTE, buffer)
        pygame.time.wait(10)

main()

有什么帮助吗？

Answer 1

您错过了通过 更新显示pygame.display.flip()。当显示器是OPENGL显示器时，这将执行缓冲区交换：

import pygame
from OpenGL.GL import *
windowsize = (800,600)

# create 800x600 buffer with RED color
buffer = bytearray(windowsize[0] * windowsize[1] * 3)
for i in range(windowsize[0] * windowsize[1]):
    buffer[i*3] = 255
    buffer[i*3+1] = 0
    buffer[i*3+2] = 0

def main():
    pygame.init()

    # create `OPENGL`, `DOUBLEBUF` display
    pygame.display.set_mode(windowsize, pygame.DOUBLEBUF| pygame.OPENGL)

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()

        # set BLACK clear color and clear the color plane
        glClearColor(0, 0, 0, 1)
        glClear(GL_COLOR_BUFFER_BIT)

        # draw buffer to dispaly
        glDrawPixels(*windowsize, GL_RGB, GL_UNSIGNED_BYTE, buffer)

        # update display
        pygame.display.flip() # <----- swap buffers

        pygame.time.wait(10)

main()