绘制纹理不起作用LWJGL

Question

我想绘制到2d纹理并在3D场景中绘制纹理。

代码初始化帧缓冲器的对象和纹理：

public static void initFBO() 
{ 
    renderEngine.framebuffers = new int[7]; 
    renderEngine.monitorTextures = new int[7]; 

    for(int i = 0;i < 7;i++) 
    { 
     renderEngine.framebuffers[i] = glGenFramebuffers(); 
     renderEngine.monitorTextures[i] = glGenTextures(); 

     glBindFramebuffer(GL_FRAMEBUFFER, renderEngine.framebuffers[i]); 
     glBindTexture(GL_TEXTURE_2D, renderEngine.monitorTextures[i]); 
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 512, 512, 0, GL_RGBA, GL_UNSIGNED_BYTE, (ByteBuffer)null); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, renderEngine.monitorTextures[i], 0); 
    }  

    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) 
     System.err.println("Error while creating FBO"); 

    glBindFramebuffer(GL_FRAMEBUFFER, 0); 
    glBindTexture(GL_TEXTURE_2D, 0); 
} 

代码用于呈现四边形帧缓冲： glUseProgram（0）;

for(int i = 0;i < 6;i++) 
    { 
     glBindFramebuffer(GL_FRAMEBUFFER, framebuffers[i]); 
     glPushAttrib(GL_VIEWPORT_BIT); 
     glViewport(0, 0, 512, 512); 
     glClearColor(0f, 0f, 0f, 1f); 
     glClear(GL_COLOR_BUFFER_BIT); 

     //glActiveTexture(GL_TEXTURE0); 
     //glEnable(GL_TEXTURE_2D); 

     glMatrixMode(GL_PROJECTION); 
     glLoadIdentity(); 
     glOrtho(0, 512, 512, 0, 1, -1); 
     glMatrixMode(GL_MODELVIEW); 

     glUseProgram(0); 

     glColor4f(1f, 0f, 0f, 1f); 
     glBegin(GL_QUADS); 
     glVertex2f(20, 20); 
     glVertex2f(420, 20); 
     glVertex2f(420, 420); 
     glVertex2f(20, 420); 
     glEnd(); 

     glBindFramebuffer(GL_FRAMEBUFFER, 0); 
     glPopAttrib(); 
    } 

如果我改变色彩分明，质地变时，我的3D场景渲染的那种颜色。但我无法看到四方。我做错了什么吗？

Answer 1

如果找到解决方案。原因我正在使用3D环境并启用了GL_CULL_FACE并将其设置为CCW（逆时针），未显示顺时针方向绘制的四边形。

我只是在绘制到framebuffer并在其后重新启用它之前禁用了此功能。

glDisable(GL_CULL_FACE); 
glEnable(GL_CULL_FACE);