DX Tessellation

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DX TessellationEdit

In its most basic form, Tessellation is a method of breaking polygons into finer pieces.

For example, if you take a square and cut it across its diagonal, you’ve 'tessellated' this square into two triangles. By itself, Tessellation does little to improve realism, the simplest and most popular way of putting the new triangles into use is a technique called 'displacement mapping'. A displacement map is a texture that stores height information, when applied to a surface, it allows vertices on the surface to be shifted up or down based on the height information.
Like tessellation, displacement mapping has been around for a long time, With DirectX 11 tessellation and displacement mapping combine together to produce smooth-looking models.

Tessellation in DX10Edit

Early DX10 Radeon hardware was equipped with Tessellation because DX11 Tessellation was going to be a feature of

DX10. As the API for running Tessellation wasn't available at the time no further graphic cards with Tessellation where produced, both DX11 OS and DX11 API/hardware being required for Tessellation.

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Tessellation in DX11Edit

Multithreaded Rendering is a feature which allows DirectX to be processed via multiple CPU threads.

This means that a dual, triple or quad-core CPU can have a higher utilization across all cores than DirectX APIs in the past.

DirectCompute is a feature which allows access to the shader cores/pipeline for Stream Computing (graphics acceleration) applications and physics acceleration.

GeForce GTX 400/500 GPUs are built with sixteen tessellation units (Shader Multiprocessors, PolyMorph engine), each with dedicated hardware for vertex fetch, tessellation, and coordinate transformations. They operate with four parallel raster engines which transform newly tessellated triangles into a fine stream of pixels for shading.

GeForce GTX 680 are built with the next generation SM design, called SMX (containing 8 SMXs).

The SM’s CUDA cores perform pixel/vertex/geometry shading and physics/compute calculations.
Texture units perform texture filtering and load/store units fetch and save data to memory.
Special Function Units (SFUs) handle transcendental and graphics interpolation instructions.
PolyMorph Engine handles vertex fetch, tessellation, viewport transform, attribute setup, and stream output.

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Tessellation a feature of Aliens v Predator 3 in DX11 mode.

DX11 hardware detect.
Advanced Shadows.

DX11.1 features that can be set.

Bindless TexturesEdit

A shader was limited to access of just 128 simultaneous textures in Fermi (which aligned with the API limits of DX11).

With bindless textures in Kepler, this additional step isn’t necessary, the shader can reference textures directly in memory, making binding tables obsolete. This effectively eliminates any limits on the number of unique textures that can be used to render a scene with over 1 million unique textures are possible. Besides dramatically increasing the number of available textures, another added benefit of bindless textures is reduced CPU utilization.

Aliens v Predator 3 PC Game Wireframe Showing TessellationEdit

Aliens v Predator 3 Xbox (scene from the Colony singleplayer)Edit

Aliens v Predator 3 PC (in game Predator Jungle)Edit


Aliens v Predator 3 PC (DX Tessellation)Edit

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