[英]Is it possible to determine the size of the default framebuffer using OpenGL only?
[英]is it possible to copy the default framebuffer to another framebuffer object in OpenGL?
我正在嘗試將渲染到屏幕后的默認幀緩沖區復制到 OpenGL 中的另一個自定義幀緩沖區。 下面是我的代碼。 你看有什么不對嗎? BLit 調用成功,但我沒有看到任何渲染。
void drawDisplayList() {
setNormalDraw();
clear();
drawDisplayLists();
drawDisplayLists();
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
glReadBuffer(GL_FRONT);
glBindFramebuffer(GL_FRAMEBUFFER, geomFBO);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, geomFBO);
glDrawBuffer(GL_COLOR_ATTACHMENT0);
glBlitFramebuffer(0, 0, _scrWidth, _scrHeight, 0, 0, _scrWidth, _scrHeight, GL_COLOR_BUFFER_BIT, GL_NEAREST);
GLenum errorCode1;
errorCode1 = glGetError();
if (errorCode1 != GL_NO_ERROR) {
printf("glBlitFramebuffer Success!");
}
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
}
我的 FBO 初始化
void createFboBuffers()
{
glGenFramebuffers(1, &geomFBO);
glBindFramebuffer(GL_FRAMEBUFFER, geomFBO);
glGenRenderbuffers(1, &color_rbo);
glBindRenderbuffer(GL_RENDERBUFFER, color_rbo);
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB, this->size().width(), this->size().height());
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, color_rbo);
glGenRenderbuffers(1, &depth_rbo);
glBindRenderbuffer(GL_RENDERBUFFER, depth_rbo);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, _scrWidth, _scrHeight);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth_rbo);
}
請任何指點。 看起來沒有任何內容被復制到另一個 FrameBuffer。
指令glBindFramebuffer(GL_FRAMEBUFFER, geomFBO)
將幀緩沖區 object 綁定到讀取和繪制幀緩沖區目標(請參閱glBindFramebuffer
)。 這會破壞默認幀緩沖區與讀取幀緩沖區目標的綁定。 只需刪除:
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
glReadBuffer(GL_FRONT);
// glBindFramebuffer(GL_FRAMEBUFFER, geomFBO); <-- DELETE
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, geomFBO);
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