void RenderTexture::startReadBack(int layer) {
if (target_ == GL_TEXTURE_2D_ARRAY) {
glBindFramebuffer(GL_READ_FRAMEBUFFER, getReadBufferId());
glViewport(0, 0, width(), height());
glFramebufferTextureLayer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, getId(), 0, layer);
glReadBuffer(GL_COLOR_ATTACHMENT0);
} else {
glBindFramebuffer(GL_READ_FRAMEBUFFER, renderTexture_gl_frame_buffer_->id());
glViewport(0, 0, width_, height_);
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target_,
gl_texture_->id(), 0);
}
glReadBuffer(GL_COLOR_ATTACHMENT0);
glBindBuffer(GL_PIXEL_PACK_BUFFER, renderTexture_gl_pbo_);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, width_, height_, GL_RGBA, GL_UNSIGNED_BYTE, 0);
readback_started_ = true;
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
}
void GLMultiviewRenderTexture::startReadBack(int layer) {
GLRenderImage* image = static_cast<GLRenderImage*>(getImage());
glBindFramebuffer(GL_READ_FRAMEBUFFER, getReadBufferId());
image->setupReadback(renderTexture_gl_pbo_, layer);
GLRenderTexture::startReadBack();
}
