Abstract: A graphics processing unit includes a culling module and a shader processor, the culling module includes a register and an overdraw culling module, and an output end of the overdraw culling module is coupled to an input end of the shader processor. The overdraw culling module is configured to: record position information of a plurality of fragments of the drawing task in the graphic region and ranking information of the plurality of fragments involved in drawing, perform the overdraw culling operation on a fragment in the sub-region based on the position information and the ranking information, and send, to the shader processor, a fragment in the plurality of fragments that needs to be drawn. The shader processor is configured to perform shading on the fragment in the plurality of fragments that needs to be drawn.

Abstract: The present invention discloses a solid-state LiDAR device and a scanning method based on a tunable laser array. The array sequentially emits laser beams of different wavelengths, collimated by a collimating lens, and passes through a beam splitter. The beams are then diffracted by a blazed grating and focused by the first focusing lens onto the focal plane of the transmitting lens, and then emitted through the transmitting lens as collimated beams in different directions for wide area scanning. The optical receiving path uses the reversed coaxial system, where the received light returns to the beam splitter, redirects to the second focusing lens, and is finally focused on the detector. This invention incorporates tunable laser arrays, optical systems and dispersion devices to realize a solid-state wide-area scanning LiDAR device without moving parts, offering a wide scanning range, small size and fast scanning speed.