我怎样才能让深度测试在OpenGL中使用Python和PyGame呢

我正在try 在Python中使用OpenGL.我还没能让深度测试起作用. 我还没能成功地安装Glut，所以我只用了PYGAME来创建窗口，并且它起作用了.

只需激活深度测试(glEnable(GL_DEPTH_TEST))就会出现空白屏幕. 编写一个片段着色器来显示每个像素的深度值，结果是所有对象都是纯白的(无论我移动到他们有多近)，而不是像预期的那样是灰色的，背景是黑色的.

#version 330 core
out vec4 fragColor;

void main()
{             
    fragColor = vec4(vec3(gl_FragCoord.z), 1.0);
}

我在某处读到，您需要在显示模式中请求深度缓冲区(当使用Glut时)，但我还没有在PyGame中找到这样做的方法.

这是我的代码的最小版本:

import OpenGL
from OpenGL.GL import *
from OpenGL.GLU import *
import pygame
from pygame.locals import *

display = (2560, 1440)

def setup_perspective_projection():
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(70, (display[0] / display[1]), 0.0, 10.0)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()

def draw_3d_cube(translatef_x, translatef_y, translatef_z):
    setup_perspective_projection()

    glTranslatef(translatef_x, translatef_y, translatef_z)

    glBegin(GL_QUADS)
    # Front face
    glColor3f(1.0, 0.0, 0.0)  # Red
    glVertex3f(-1.0, -1.0, 1.0)
    glVertex3f(1.0, -1.0, 1.0)
    glVertex3f(1.0, 1.0, 1.0)
    glVertex3f(-1.0, 1.0, 1.0)
    # Back face
    glColor3f(0.0, 1.0, 0.0)  # Green
    glVertex3f(-1.0, -1.0, -1.0)
    glVertex3f(-1.0, 1.0, -1.0)
    glVertex3f(1.0, 1.0, -1.0)
    glVertex3f(1.0, -1.0, -1.0)
    # Top face
    glColor3f(0.0, 0.0, 1.0)  # Blue
    glVertex3f(-1.0, 1.0, -1.0)
    glVertex3f(-1.0, 1.0, 1.0)
    glVertex3f(1.0, 1.0, 1.0)
    glVertex3f(1.0, 1.0, -1.0)
    # Bottom face
    glColor3f(1.0, 1.0, 0.0)  # Yellow
    glVertex3f(-1.0, -1.0, -1.0)
    glVertex3f(1.0, -1.0, -1.0)
    glVertex3f(1.0, -1.0, 1.0)
    glVertex3f(-1.0, -1.0, 1.0)
    # Right face
    glColor3f(1.0, 0.0, 1.0)  # Magenta
    glVertex3f(1.0, -1.0, -1.0)
    glVertex3f(1.0, 1.0, -1.0)
    glVertex3f(1.0, 1.0, 1.0)
    glVertex3f(1.0, -1.0, 1.0)
    # Left face
    glColor3f(0.0, 1.0, 1.0)  # Cyan
    glVertex3f(-1.0, -1.0, -1.0)
    glVertex3f(-1.0, -1.0, 1.0)
    glVertex3f(-1.0, 1.0, 1.0)
    glVertex3f(-1.0, 1.0, -1.0)
    glEnd()

# Shader source code
fragment_shader_source = """
#version 330 core
out vec4 fragColor;

void main()
{             
    fragColor = vec4(vec3(gl_FragCoord.z), 1.0);
}
"""

def compile_shader(shader_type, source):
    shader = glCreateShader(shader_type)
    glShaderSource(shader, source)
    glCompileShader(shader)
    return shader

def create_shader_program(fragment_source):
    fragment_shader = compile_shader(GL_FRAGMENT_SHADER, fragment_source)

    shader_program = glCreateProgram()
    glAttachShader(shader_program, fragment_shader)
    glLinkProgram(shader_program)

    return shader_program

def main():
    pygame.init()
    pygame.display.set_mode(display, DOUBLEBUF | OPENGL | HWSURFACE | FULLSCREEN)
    #glEnable(GL_DEPTH_TEST)
    glDepthFunc(GL_LESS)
    glEnable(GL_CULL_FACE)

    shader_program = create_shader_program(fragment_shader_source)
    glUseProgram(shader_program)

    clock = pygame.time.Clock()
    FPS = 144

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

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

        draw_3d_cube(-2, -2, -5)
        draw_3d_cube(-2,-2,-10)

        pygame.display.flip()

if __name__ == "__main__":
    main()

您可能希望在第7行更改显示器的分辨率/大小. 第89行是注释，因为否则屏幕是空白的. 要停用着色器，只需删除第94行(您可以看到后面的立方体是如何绘制在立方体前面的).