APPARATUS AND METHOD FOR VERIFYING THE ORIGIN OF TEXTURE MAP IN GRAPHICS PIPELINE PROCESSING
The present application relates to an apparatus for verifying the origin of texture data and a method of operating thereof. The apparatus comprises a frame buffer; at least one texture buffer; a graphics processing pipeline with a fragment shader unit; and a comparator unit. The at least one texture buffer is provided to store texture data and test texture data. The fragment shader unit maps the test texture data retrieved from the texture buffer on a predefined area of the image data stored in the frame buffer. The comparator unit extracts image data values located in the predefined area of the image data stored in the frame buffer; compares the extracted image data with reference data and issues a fault indication signal in case the extracted image data and the reference data mismatch.
1 . An apparatus for verifying the origin of texture data, said apparatus comprising:
a frame buffer provided to buffer image data to be displayed;
at least one texture buffer provided to store texture data and test texture data;
a graphics processing pipeline comprising a fragment shader unit,
wherein the fragment shader unit is coupled to the frame buffer and the at least one texture buffer,
wherein the fragment shader unit is configured to map the test texture data retrieved from the texture buffer on a predefined area of the image data stored in the frame buffer; and
a comparator unit coupled to the frame buffer,
wherein the comparator unit is configured
to extract image data values located in the predefined area of the image data stored in the frame buffer,
to compare the extracted image data with reference data and
to issue a fault indication signal in case the extracted image data and the reference data mismatch with each other.
2 . The apparatus according to claim 1 ,
wherein the comparator unit is further configured to determine a checksum based on the extracted image data values and compare the checksum with the reference data comprising a reference checksum.
3 . The apparatus according to claim 1 ,
wherein the reference data is precomputed on the basis of the test texture data and a test texture primitive, on which surface the test texture data is mapped.
4 . The apparatus according to claim 1 ,
wherein the fragment shader unit is configured to receive a stream of fragment data generated by a rasterizer unit arranged upstream to the fragment shader unit in the graphics processing pipeline.
5 . The apparatus according to claim 1 ,
wherein the fragment shader unit is configured to map the test texture data on the predefined area in accordance with a test texture primitive inserted into the data flow of the graphics processing pipeline.
6 . The apparatus according to claim 5 ,
wherein the test texture primitive is a degenerated triangle primitive, wherein the texture coordinates associated with the degenerated triangle primitive refer to a sequence of neighboring texels forming the test texture data.
7 . The apparatus according to claim 5 ,
wherein the test texture primitive is inserted into the data flow of the graphics processing pipeline in form of predetermined fragment data to be processed by the fragment shader unit.
8 . A method for verifying the origin of texture data, said method comprising:
providing at least one texture buffer with texture data and test texture data;
mapping the test texture data retrieved from the texture buffer on a predefined area of the image data stored in a frame buffer using a fragment shader unit of a graphics processing pipeline;
extracting image data values located in the predefined area of the image data stored in the frame buffer;
comparing the extracted image data with reference data; and
issuing a fault indication signal in case the extracted image data and the reference data mismatch.
9 . The method according to claim 8 , further comprising:
determining a checksum based on the extracted image data values; and
comparing the checksum with the reference data comprising a reference checksum.
10 . The method according to claim 8 ,
wherein the reference data is precomputed on the basis of the test texture data and a test texture primitive, on which surface the test texture data is mapped.
11 . The method according to claim 8 , further comprising:
receiving a stream of fragment data generated by a rasterizer unit arranged upstream to the fragment shader unit in the graphics processing pipeline.
12 . The method according to claim 8 , further comprising:
inserting a test texture primitive inserted into the data flow of the graphics processing pipeline; and
mapping the test texture data on the predefined area in accordance with the inserted test texture primitive using the fragment shader unit of the graphics processing pipeline.
13 . The method according to claim 12 , further comprising:
inserting the test texture primitive into the data flow of the graphics processing pipeline in form of predetermined fragment data to be processed by the fragment shader unit.
14 . A non-transitory, tangible computer readable storage medium bearing computer executable instructions for verifying the origin of texture data, wherein the instructions, when executing on one or more processing devices, cause the one or more processing devices to perform a method comprising:
mapping the test texture data retrieved from the at least one texture buffer on a predefined area of the image data stored in a frame buffer using a fragment shader unit of a graphics processing pipeline, wherein the at least one texture buffer is provided with a texture data and the test texture data;
extracting image data values located in the predefined area of the image data stored in the frame buffer;
comparing the extracted image data with reference data; and
issuing a fault indication signal in case the extracted image data and the reference data mismatch.