![]() ![]() The output buffer must be bound through special new API calls such as glBindBufferRangeNV(), and so on.We need to specify the output attributes and whether each of them is output into a separate buffer object or they are all output interleaved into a single buffer object.The GL's target parameter is changed to GL_TRANSFORM_FEEDBACK_BUFFER_NV.Rendering in transform feedback mode is like regular rendering from buffer objects except for the following differences: Figure 36-1 illustrates the process.įigure 36-1 The Transform Feedback Mode Processing Pipeline This way we can store the output of the shaders into buffer objects as vertex attributes. In this mode the GPU can send its output to a buffer before the rasterization stage. Transform feedback mode is a new OpenGL mode of operation. In this section we briefly introduce some of these extensions. FOUR X ENCRYPTO SERIES36.1 New Functions for Integer Stream Processingįor our implementation of the AES encryption system, we use the new OpenGL extensions provided by NVIDIA in the GeForce 8 Series (NVIDIA 2006, 2007). In addition, within the AES system, we consider several block-cipher modes of operation (Dworkin 2001) that demonstrate the practical cases where the GPU can be used to optimize performance through parallel processing, and other cases where it cannot. 2005) and precisely thanks to these new features, our implementation shows slight performance gains over CPU implementations. In this chapter we present an application of these new features by implementing Advanced Encryption Standard (AES) (NIST 2001) encryption and decryption on the GPU. ![]() And finally, with the new "transform feedback mode," it is now possible to store our results without the need to render to textures or pixel buffers. Second, array parameters and the new texture-buffer object provide a flexible way of referring to integer-indexed tables. First, the new integerprocessing features include not only the arithmetic operations but also the bitwise logical operations (such as AND and OR) and the right/left shift operations. However, with the advent of the new GeForce 8 Series GPU, several new extensions and functions have been introduced to GPU programming. Therefore, to process streaming data, we needed to write tricky graphics code. Another issue was that we had to render the output of the GPU to textures or pixel buffers before we could get to our results. Traditionally the GPU has been used almost exclusively for floating-point operations, because integer operations could only be done using the mantissa of floats thus, processes that required bitwise logical operations were impossible. In this chapter, we take up integer stream processing on the GPU, which has been at best a difficult task to do on the GPU up to now. You can also subscribe to our Developer News Feed to get notifications of new material on the site.Ĭhapter 36. The CD content, including demos and content, is available on the web and for download. FOUR X ENCRYPTO FOR FREEGPU Gems 3 GPU Gems 3 is now available for free online! ![]()
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