[英]OpenGL FBO Texture messes up when attaching Depth Texture (C++)
我正在嘗試將我的場景渲染到我的FBO,然后在屏幕的角落以較小的尺寸渲染它。 它工作正常,但只有FBO只有顏色紋理。 當我嘗試將Depth Texture或Depth Buffer附加到它時,它會繪制我的屏幕的單個像素。 這是一些屏幕:
這是我的FBO類代碼:
FrameBuffer::FrameBuffer()
{
GLcall( glGenFramebuffers(1, &m_id) );
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, m_id) );
GLcall( glDrawBuffer(GL_COLOR_ATTACHMENT0) );
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, 0) );
}
void FrameBuffer::attachTexture(const unsigned int width, const unsigned int height)
{
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, m_id) );
m_textureAttachmentsIDs.push_back(0);
GLcall( glGenTextures(1, &m_textureAttachmentsIDs[ m_textureAttachmentsIDs.size() - 1 ]) );
GLcall( glBindTexture(GL_TEXTURE_2D, m_textureAttachmentsIDs[ m_textureAttachmentsIDs.size() - 1 ]) );
GLcall( glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE) );
GLcall( glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_textureAttachmentsIDs[ m_textureAttachmentsIDs.size() - 1 ], 0) );
GLcall( glBindTexture(GL_TEXTURE_2D, 0) );
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, 0) );
}
void FrameBuffer::attachDepthTexture(const unsigned int width, const unsigned int height)
{
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, m_id) );
GLcall( glGenTextures(1, &m_depthTextureAttachmentID) );
GLcall( glBindTexture(GL_TEXTURE_2D, m_depthTextureAttachmentID) );
GLcall( glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE) );
GLcall( glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_ALPHA) );
GLcall( glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_depthTextureAttachmentID, 0) );
GLcall( glBindTexture(GL_TEXTURE_2D, 0) );
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, 0) );
}
void FrameBuffer::attachDepthBuffer(const unsigned int width, const unsigned int height)
{
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, m_id) );
GLcall( glGenRenderbuffers(1, &m_depthBufferAttachmentID) );
GLcall( glBindRenderbuffer(GL_RENDERBUFFER, m_depthBufferAttachmentID) );
GLcall( glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height) );
GLcall( glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_depthBufferAttachmentID) );
GLcall( glBindRenderbuffer(GL_RENDERBUFFER, 0) );
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, 0) );
}
void FrameBuffer::bind(const unsigned int width, const unsigned int height) const
{
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, m_id) );
GLcall( glViewport(0, 0, width, height) );
}
void FrameBuffer::unbind(const Window& window) const
{
GLcall( glBindFramebuffer(GL_FRAMEBUFFER, 0) );
GLcall( glViewport(0, 0, window.getWidth(), window.getHeight()) );
}
這是設置我的FBO和Sprite以將紋理渲染到的代碼:
FrameBuffer testFBO;
testFBO.attachTexture(320, 180);
testFBO.attachDepthTexture(320, 180);
Layer2D layer(window);
Sprite2D screenSprite(vector2(400.0f, 600.0f), vector2(640.0f, 360.0f));
layer.addSprite(&screenSprite);
Texture screenTexture(testFBO.getTextureAttachments()[0], 320, 180);
這是處理渲染的代碼:
testFBO.bind(320, 180);
rr.render(cam);
testFBO.unbind(window);
screenSprite.setTexture(&screenTexture);
rr.render(cam);
layer.render();
我不發布渲染代碼,因為如果我沒有附加Depth Texture或Depth Buffer,它會渲染一切。
是的,我正在清除深度緩沖區:
GLcall( glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) );
GLcall()函數檢查任何OpenGL錯誤,並且在執行此代碼時沒有任何錯誤。
提前致謝。
解決方法是清除FBO的深度緩沖區。
testFBO.bind(320, 180);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
rr.render(cam);
testFBO.unbind(window);
我只清除了默認FBO的深度緩沖區。
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