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我正在使用 Derelict3，它使用特定的 openGL3 标准，如果调用 glEnable(GL_DEPTH_TEST)，我会遇到屏幕冻结（不更新）的问题，如果不是，深度缓冲区不起作用。我注意到设置清除颜色和启用深度测试的调用如果在设置 SDL_GL 上下文和重新加载 Derelict3 之前进行，则会被忽略。我必须按以下顺序制作它们：

win=SDL_CreateWindow("3Doodle", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, w, h,     flags); 
if(!win){ 
       writefln("Error creating SDL window"); 
      SDL_Quit(); 
} 

context=SDL_GL_CreateContext(win); 
SDL_GL_SetSwapInterval(1); 

glVersion=DerelictGL3.reload(); 

glEnable(GL_DEPTH_TEST); 
glEnable(GL_CULL_FACE); 

glClearColor(0.0, 0.0, 0.0, 1.0); 
glClearDepth(1.0); 

glCullFace(GL_BACK); 
glFrontFace(GL_CCW);

虽然这在写入标准双缓冲区时解决了深度剔除，但当我使用 renderBuffer 作为新的深度缓冲区实现帧缓冲区对象时，我得到了冻结...程序编译并运行时没有警告，但渲染图像到屏幕对齐的四边形保持固定。如果我注释掉 glEnable(GL_DEPTH_TEST); 相机自由移动，但渲染图像不考虑深度测试，只是按顺序绘制对象。

帧缓冲初始化代码为：

//fbo 
glEnable (GL_FRAMEBUFFER_SRGB); 
glGenFramebuffers(1, &fbo); 
assert(fbo > 0); 
glBindFramebuffer(GL_FRAMEBUFFER, fbo); 

glGenRenderbuffers(1, &rbo); 
assert(rbo > 0); 
glBindRenderbuffer(GL_RENDERBUFFER, rbo); 
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, projMat.w, projMat.h); 
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbo); 
glBindRenderbuffer(GL_RENDERBUFFER, 0); 

glGenTextures(1, &fbon); 
assert(fbon > 0); 
glActiveTexture(GL_TEXTURE0); 
glBindTexture(GL_TEXTURE_2D, fbon); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, projMat.w, projMat.h, 0, GL_RGBA,     GL_UNSIGNED_BYTE, null); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbon, 0); 
glBindTexture(GL_TEXTURE_2D, 0); 

 glGenTextures(1, &fboc); 
assert(fboc > 0); 
glActiveTexture(GL_TEXTURE1); 
glBindTexture(GL_TEXTURE_2D, fboc); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, projMat.w, projMat.h, 0, GL_RGBA,     GL_UNSIGNED_BYTE, null); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, fboc, 0); 
glBindTexture(GL_TEXTURE_2D, 0); 

glGenTextures(1, &fbop); 
assert(fbop > 0); 
glActiveTexture(GL_TEXTURE2); 
glBindTexture(GL_TEXTURE_2D, fbop); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, projMat.w, projMat.h, 0, GL_RGBA,     GL_UNSIGNED_BYTE, null); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);    
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, fbop, 0); 
glBindTexture(GL_TEXTURE_2D, 0); 

int status=glCheckFramebufferStatus(GL_FRAMEBUFFER); 
assert(status == GL_FRAMEBUFFER_COMPLETE); 

buffs=[GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2]; 
glDrawBuffers(3, buffs.ptr); 
glBindFramebuffer(GL_FRAMEBUFFER, 0);

在 draw() 中调用 fbo 的代码是：

glBindFramebuffer(GL_FRAMEBUFFER, fbo); 
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

glUseProgram(shad); 
glUniformMatrix4fv(viewLoc, 1, GL_TRUE, player.mat.ptr); 

current.draw(); 

glUseProgram(0); 
glBindFramebuffer(GL_FRAMEBUFFER, 0); 

rend.draw();

我很茫然，因为相同的代码在 c# 中正常工作。

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1 回答 1

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我的愚蠢。忘记指定 glDepthFunc

于 2012-05-07T09:23:37.313 回答