當啓用GL_DEPTH_TEST時，在幀緩衝區中渲染不會生效

Question

我正嘗試渲染幀緩衝區中的所有內容。

所以我做了深度紋理和顏色紋理附着幀緩衝區如下所示：http://www.opengl.org/wiki/Framebuffer_Object_Examples#Color_texture.2C_Depth_texture

但如果啓用GL_DEPTH_TEST沒有呈現。 我在做什麼錯？

整個代碼太長...

幀緩衝類：

class FrameBuffer { 
    GLuint id; 
    size_t width, height, nColorAttachMents; 
    GLuint colorTexture[GL_MAX_COLOR_ATTACHMENTS_EXT]; 
    GLuint depthTexture; 
private: 
    void attachDepthTexture(); 
    void attachColorTexture(GLuint); 
public: 
    void create(size_t, size_t, size_t); 
    void bindDepthTexture() const; 
    void bindColorTexture(GLuint) const; 
    void bind() const; 
    void unbind() const; 
    size_t getWidth() const; 
    size_t getHeight() const; 
}; 
void FrameBuffer::attachDepthTexture() { 
    glGenTextures(1, &depthTexture); 
    glBindTexture(GL_TEXTURE_2D, depthTexture); 

    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); 
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); 

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL); 
    glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_INTENSITY); 

    glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, width, height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL); 
    glBindTexture(GL_TEXTURE_2D, 0); 

    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, depthTexture, 0); 
} 
void FrameBuffer::attachColorTexture(GLuint i) { 
    i=clamp(i, 0, GL_MAX_COLOR_ATTACHMENTS_EXT-1); 

    glGenTextures(1, &colorTexture[i]); 
    glBindTexture(GL_TEXTURE_2D, colorTexture[i]); 

    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); 
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); 

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL); 
    glBindTexture(GL_TEXTURE_2D, 0); 

    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT+i, GL_TEXTURE_2D, colorTexture[i], 0); 
} 
void FrameBuffer::create(size_t width, size_t height, size_t nColorAttachMents=1) { 
    this->width=width; 
    this->height=height; 
    nColorAttachMents=clamp(nColorAttachMents, 0, GL_MAX_COLOR_ATTACHMENTS_EXT); 
    this->nColorAttachMents=nColorAttachMents; 

    GLenum FBOstatus; 

    glGenFramebuffersEXT(1, &id); 
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id); 

    if(nColorAttachMents==0) { 
     glDrawBuffer(GL_NONE); 
     glReadBuffer(GL_NONE); 
    } 

    attachDepthTexture(); 
    for(int i=0; i<nColorAttachMents; i++) 
     attachColorTexture(i); 

    FBOstatus = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); 
    if(FBOstatus != GL_FRAMEBUFFER_COMPLETE_EXT) 
     showMessage("GL_FRAMEBUFFER_COMPLETE_EXT failed, CANNOT use FBO", "FBO Create error"); 
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); 
} 
void FrameBuffer::bindDepthTexture() const { 
    glBindTexture(GL_TEXTURE_2D, depthTexture); 
} 
void FrameBuffer::bindColorTexture(GLuint i=0) const { 
    i=clamp(i, 0, GL_MAX_COLOR_ATTACHMENTS_EXT-1); 
    glBindTexture(GL_TEXTURE_2D, colorTexture[i]); 
} 
void FrameBuffer::bind() const { 
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id); 
} 
void FrameBuffer::unbind() const { 
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); 
} 
size_t FrameBuffer::getWidth() const { 
    return width; 
} 
size_t FrameBuffer::getHeight() const { 
    return height; 
} 

這裏使用：

void Game::init() { 
    if(loaded) { 
     Terrain::init(); 

     mainFrameBuffer.create(Settings::screenWidth, Settings::screenHeight, 1); 
    ... 
} 
void Game::render() { 
    glMatrixMode(GL_PROJECTION); 
    glPushMatrix(); 
    glLoadIdentity(); 
    gluPerspective(45.0, (float)Game::Settings::screenWidth/Game::Settings::screenHeight, 0.1, 1000.0); 

    glMatrixMode(GL_MODELVIEW); 
    glPushMatrix(); 
    glLoadIdentity(); 
    setCamera(); 
    frustum.updateFrustum(); 

    if(Settings::shadowOn) makeShadow(); 

    mainFrameBuffer.bind(); 
    if(Settings::renderSkyOn) renderSky(); 
    if(Settings::reflectionOn) renderReflection(Settings::terrainShaderOn, Settings::objectShaderOn); 
    if(Settings::renderTerrainOn) renderTerrain(Settings::terrainShaderOn, Settings::shadowOn); 
    if(Settings::renderObjectsOn) renderObjectsUnderwater(); 
    if(Settings::renderWaterOn) renderWater(true); 
    drawCursor(); 
    if(Settings::renderObjectsOn) renderObjects(Settings::objectShaderOn); 
    drawMarkers(); 
    renderProjectiles(); 
    renderParticles(); 
    mainFrameBuffer.unbind(); 

    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    glOrtho(-1, 1, -1, 1, 1, -1); 

    glMatrixMode(GL_MODELVIEW); 
    glLoadIdentity(); 

    glEnable(GL_TEXTURE_2D); 
    mainFrameBuffer.bindColorTexture(); 
    glDrawRectangle(-1, 1, 1, -1); 
    Texture2D::bindNone(); 
    glDisable(GL_TEXTURE_2D); 

    glMatrixMode(GL_MODELVIEW); 
    glPopMatrix(); 

    glMatrixMode(GL_PROJECTION); 
    glPopMatrix(); 

} 

反射呈現關閉深度測試。這隻出現。

Answer 1

對不起，我忘了清除新的framebuffer。