EGGH01: SIGGRAPH/Eurographics Workshop on Graphics Hardware 2001

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https://diglib.eg.org/handle/10.2312/334

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Browsing EGGH01: SIGGRAPH/Eurographics Workshop on Graphics Hardware 2001 by Subject "Bitmap and framebuffer operations."

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    Perlin Noise Pixel Shaders
    (The Eurographics Association, 2001) Hart, John C.; Kurt Akeley and Ulrich Neumann
    While working on a method for supporting real-time procedural solid texturing, we developed a general purpose multipass pixel shader to generate the Perlin noise function. We implemented this algorithm on SGI workstations using accelerated OpenGL PixelMap and PixelTransfer operations, achieving a rate of 2.5 Hz for a 256x256 image. We also implemented the noise algorithm on the NVidia GeForce2 using register combiners. Our register combiner implementation required 375 passes, but ran at 1.3 Hz. This exercise illustrated a variety of abilities and shortcomings of current graphics hardware. The paper concludes with an exploration of directions for expanding pixel shading hardware to further support iterative multipass pixel-shader applications.