EGGH99: SIGGRAPH/Eurographics Workshop on Graphics Hardware 1999

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https://diglib.eg.org/handle/10.2312/336

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Browsing EGGH99: SIGGRAPH/Eurographics Workshop on Graphics Hardware 1999 by Subject "Color"

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    Antialiased Parameterized Solid Texturing Simplified for Consumer- Level Hardware Implementation
    (The Eurographics Association, 1999) Hart, John C.; Carr, Nate; Karneya, Masaki; Tibbitts, Stephen A.; Coleman, Terrance J.; A. Kaufmann and W. Strasser and S. Molnar and B.- O. Schneider
    Procedural solid texturing was introduced fourteen years ago, but has yet to find its way into consumer level graphics hardware for teal-time operation. To this end, a new model is introduced that yields a parameterized function capable of synthesizing the most common procedural solid textures, specifically wood, marble, clouds and fire. This model is simple enough to be implemented in hardware, and can be realized in VLSI with as little as 100,000 gates. The new model also yields a new method for antialiasing synthesized textures. An expression for the necessary box filter width is derived as a function of the texturing parameters, the texture coordinates and the rasterization variables. Given this filter width, a technique for efficiently box filtering the synthesized texture by either mip mapping the color table or using a summed area color table are presented. Examples of the antialiased results are shown.
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    Fast Footprint MlPmapping
    (The Eurographics Association, 1999) Hüttner, Tobias; Straßer, Wolfgang; A. Kaufmann and W. Strasser and S. Molnar and B.- O. Schneider
    Mapping textures onto surfaces of computer-generated objects is a technique which greatly improves the realism of their appearance. In this paper, we describe a new method for efficient and fast texture filtering to prevent aliasing during texture mapping. This method, called Fast Footprint MIPmapping, is very flexible and can be adapted to the internal bandwrdth of a graphrcs system. It adopts the prefiltered MIPmap data structure of currently available trilinear MIPmapping implementatrons, but exploits the texels fetched from texture memory in a more optimal manner. Furthermore, like trilinear MIPmapping, fast footprint MIPmapping can easily be realized in hardware. It is sufficient to fetch only eight texels per textured pixel to achieve a significant improvement over classical trilinear MIPmapping.
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    Multiresolution Rendering With Displacement Mapping
    (The Eurographics Association, 1999) Gumhold, Stefan; Hüttner, Tobias; A. Kaufmann and W. Strasser and S. Molnar and B.- O. Schneider
    In this paper, we present for the first time an approach for hardware accelerated displacement mapping. The displaced surface is generated from a 2D displacement map by remeshing a coarse triangle mesh according to the screen projection of the surface The remeshing algorithm is implemented in hardware. Filtered access to the displacement map makes our approach competitive with available view dependent multiresolution techniques. The advantage of displacement mapping is the compact representation. A displacement mapped surface consumes together with all filter levels only a fraction of the storage space needed for a hardware compatible representation of an equivalent triangle mesh. A possible design of the displacement mapping rendering pipeline is proposed. Previously described hardware components are used as often as possible. Our approach can be smoothly integrated into all available graphics application programming interfaces. Most existing graphics applications can be extended to the new feature with marginal effort.
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    Texture Shaders
    (The Eurographics Association, 1999) McCool, Michael D.; Heidrich, Wolfgang; A. Kaufmann and W. Strasser and S. Molnar and B.- O. Schneider
    Extensions to the texture-mapping support of the abstract graphics hardware pipeline and the OpenGL API are proposed to better support programmable shading, with a unified interface, on a variety of future graphics accelerator architectures. Our main proposals include better support for texture map coordinate generation and an abstract, programmable model for multitexturing. As motivation, we survey several interactive rendering algorithms that target important visual phenomena. With hardware implementation of programmable multitexturing support, implementations of these effects that currently take multiple passes can be rendered in one pass. The generality of our proposed extensions enable efficient implementation of a wide range of other interactive rendering algorithms. The intermediate level of abstraction of our API proposal enables high-level shader metaprogramming toolkits and relatively straightforward implementations, while hiding the details of multitexturing support that are currently fragmenting OpenGL into incompatible dialects.