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This article describes Windows Advanced Rasterization Platform (WARP) and the following aspects of WARP.
- WARP Benefits
- Recommended Application Types for WARP
What is WARP?
WARP is a high speed, fully conformant software rasterizer. It is a component of the DirectX graphics technology that was introduced by the Direct3D 11 runtime. The Direct3D 11 runtime is installed on Windows 7, Windows Server 2008 R2, and Windows Vista with the [KB971644] update. Windows 8, Windows 10, Windows Server 2012 & above, and Windows RT include the Direct3D 11.1 runtime, which has an updated version of WARP. Windows 10 Fall Creators Update (1709) includes a version of WARP that supports both Direct3D 11 and Direct3D 12 runtimes.
WARP Benefits
WARP provides the following benefits:
Removing the Need for Custom Software Rasterizers
WARP simplifies development by removing the need to build a custom software rasterizer and to tune your application for it instead of tuning your application for hardware. By providing a single, general purpose software rasterizer, you no longer need to write image rendering algorithms in multiple ways to run on hardware or software with different features and capabilities. You can still implement algorithms in multiple ways to achieve better performance or scaling; however, you do not need to change the API or rendering architecture that is used to implement those algorithms. Instead, you can focus on creating a great Direct3D 10 or later application that will look the same and perform well on hardware or in software.
Enabling Maximum Performance from Graphics Hardware
When an application is tuned to run efficiently on hardware, it will run efficiently on WARP as well. The converse is also true; any application that is tuned to run well on WARP will perform well on hardware. Applications that use Direct3D 10 and later inefficiently might not scale efficiently on different hardware. WARP has similar performance profiles to hardware, so tuning an application for large batches, minimizing state changes, removing synchronizing points or locks will benefit both hardware and WARP.
Enabling Rendering When Direct3D Hardware is Not Available
WARP allows fast rendering in a variety of situations where hardware implementations are undesirable or unavailable, including:
- When the user does not have any Direct3D-capable hardware
- When an application runs as a service or in a server environment
- When an application wants to reserve the Direct3D hardware resources for other uses
- When a video card is not installed
- When a video driver is not available, or is not working correctly
- When a video card is out of memory, hangs, or would take too many system resources to initialize
Leveraging Existing Resources for Software Rendering
There is a huge community, many books, Web sites, SDKs, samples, white papers, mailing lists and other resources that can help you take advantage of Direct3D 10 and later shader-based image rendering. With WARP as a software fallback, you can use existing knowledge about hardware to improve the performance of your application when it runs with hardware or software. In addition, many excellent tools from the graphics card vendors and in the DirectX SDK can help you design, build, develop, debug and analyze performance issues of graphics applications. These tools and knowledge can now benefit application development that targets both hardware and software when you use WARP.
Enabling Scenarios that Do Not Require Graphics Hardware
Various algorithms and applications (image processing algorithms, printing, remoting, Virtual PCs and other emulators, high quality font rendering, charts, graphs, and so on) have typically been optimized for the CPU because they are not dependent on hardware. With WARP, you can use a single architecture that runs these algorithms and applications and that can run fully in software; yet, if hardware acceleration is available, you can take advantage of it.
Completing the DirectX Graphics Platform
WARP allows you to access all Direct3D 10 and later graphics features even on computers without Direct3D 10 and later graphics hardware. Direct3D 10 removed capability bits (caps); that is, you no longer need to verify whether graphics capabilities are available from graphics hardware because Direct3D 10 and later guarantees this availability. You can now use all the features of a wide range of video cards knowing that their application will behave and look the same everywhere. You can scale the performance of these applications by simply disabling expensive graphics features on low end video cards or rendering to smaller targets.
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WARP Capabilities and Requirements
WARP fully supports all Direct3D 10 and 10.1 features. For example, WARP supports the following most important features:
- All the precision requirements of the Direct3D 10 and 10.1 specification
- Direct3D 11 when used with feature levels 9_1, 9_2, 9_3, 10_0, and 10_1 (for more information about feature levels, see D3D_FEATURE_LEVEL)
- All optional texture formats, such as multisample render targets and sampling from float surfaces
- Antialiased, high quality rendering up to 8x multisample antialiasing (MSAA)
- Anisotropic filtering
- 32-bit and 64-bit applications and large address aware 32-bit applications
When you install the Platform Update for Windows 7 on Windows 7 SP1 or Windows Server 2008 R2 SP1, that operating system then includes the Direct3D 11.1 runtime and a version of WARP that supports Direct3D 11.x when used with feature levels 9_1, 9_2, 9_3, 10_0, 10_1, and 11_0.
Windows 8, Windows 10, Windows Server 2012 & above, and Windows RT include the Direct3D 11.1 runtime and a new version of WARP. This version supports Direct3D 11.x when used with feature levels 9_1, 9_2, 9_3, 10_0, 10_1, 11_0, and 11_1.
Windows 10 Fall Creators Update (1709) includes a new version of WARP that supports Direct3D 12 feature levels 12_0 and 12_1.
The minimum computer requirements for WARP are the same as for Windows Vista, specifically:
- Minimum 800 MHz CPU
- MMX, SSE, or SSE2 is not required
- Minimum 512 MB of RAM
How to Use WARP
Direct3D 10, 10.1, 11, and 12 components can use an additional driver type that you can specify when you create the device (for example, when you call the D3D11CreateDevice function). This driver type is D3D10_DRIVER_TYPE_WARP or D3D_DRIVER_TYPE_WARP. When you specify this driver type, the runtime creates a WARP device and does not initialize a hardware device.
Because WARP uses the same software interface to Direct3D as the reference rasterizer does, any Direct3D application that can support running with the reference rasterizer can be tested by using WARP. To use WARP, rename D3d10warp.dll to D3d10ref.dll and place it in the same folder as the sample or application. Next, when you switch to ref, you will see WARP rendering.
If you rename WARP to D3d10ref.dll and place it in C:Program Files (x86)Microsoft DirectX SDK (June 2010)SamplesC++Direct3DBinx86, you can run all the DirectX samples against WARP, either by clicking the 'Toggle Ref' button in the sample, or by running the sample with /ref specified on the command line.
Recommended Application Types for WARP
All applications that can use Direct3D can use WARP. This includes the following types of applications:
Casual Games
Games typically have simple rendering requirements. However, they also require the use of impressive visual effects that might need hardware acceleration. The majority of the best selling game titles for Windows are either simulations or casual games, neither of which requires high performance graphics. However, both styles of games greatly benefit from modern shader-based graphics and the ability to scale on hardware.
Existing Non-Gaming Applications
A large amount of graphical applications require a minimal number of code paths in their rendering layer. WARP enables these applications to implement a single Direct3D code path that can target a large number of computer configurations.
Advanced Rendering Games
Game developers might want to isolate graphics-card or driver-specific rendering errors. Therefore, all games, even extremely graphically demanding games, can benefit from being able to render their content by using WARP. You can use WARP to validate whether any visual artifacts that you find are rendering errors or problems with hardware or drivers.
Other Applications
The target applications for WARP also include those that might not currently use Direct3D 10 or Direct3D 10.1. These target applications include applications that must always work on all computers, image processing applications that do not write CPU and GPU versions of image processing algorithms, image processing algorithms where speed or use the GPU is not critical, such as printing, and emulators and virtual environments that display advanced 3D graphics.
WARP Architecture and Performance
WARP is based on the reference rasterizer codebase. Therefore, WARP uses the same software interface to both Direct3D 10 and later and DXGI. WARP is included in Windows 7 in the D3d10warp.dll, located in Windows systems folders. Two versions of WARP are installed on 64 bit machines, an x86 and x64 version. The x64 version might run faster in certain circumstances because the code generator contained in WARP can take advantage of the additional registers that are available when users run 64-bit applications.
WARP contains the following two high-speed, real-time compilers:
- The high-level intermediate language compiler that converts HLSL bytecode and the current render state into an optimized stream of vector commands for the geometry shader (GS), vertex shader (VS), and pixel shader (PS) stages of the pipeline.
- The high-performance just-in-time code generator that can take these commands and generate optimized SSE2, SSE4.1, x86, x64, arm, and arm64 assembly code.
WARP uses the thread pool and complex task management and dependency tracking that was introduced in Windows Vista to allow all parts of the rendering pipeline to be distributed efficiently across available CPU cores.
WARP uses deferred rendering. That is, WARP can batch rendering commands so that rasterization occurs only when sufficient data is available to use all the CPU resources efficiently. Work on the main application thread is minimized to allow the application to submit commands as quickly as possible. If an application is also multi-threaded, and it uses the thread pool, work will be evenly distributed between WARP and the application.
The WARP code generator has been tuned to make best use of the modern CPU architecture. WARP runs on all computers that can run Windows Vista and later operating systems, even if the computer does not support SSE. However, WARP has been optimized for computers that support SSE2. It also contains optimizations for specific architectures of AMD and Intel processors, as well as support for the SSE 4.1 extensions.
WARP does not require graphics hardware to execute. It can execute even in situations where hardware is not available or cannot be initialized.
Applications and samples that were designed and built to run on Direct3D 10 and later hardware without any knowledge of WARP will likely run well by using WARP. However, we recommend that you lower the quality settings and resolution as much as possible to achieve usable frame rates. You can use WARP to develop and tune applications that run well on both hardware and software.
Because WARP uses multiple CPU cores, it performs best on modern quad core CPUs. WARP also runs significantly faster on computers with SSE4.1 extensions installed. Microsoft performed significant testing and performance tuning on computers with eight or more cores and SSE4.1 because these high end computers will become more common during the lifetime of Windows 7 and later operating systems.
When WARP is running on the CPU, it is limited compared to a graphics card in a number of ways. The front-side bus speed of a CPU is typically around or under 10 GB/s. In contrast, a graphics card often has dedicated memory that uses 20 to 100GB/s or more of graphics bandwidth. Graphics hardware also has fixed-function units that can perform complex and expensive tasks, such as texture filtering, format decompression, or conversions, asynchronously with little overhead or power cost. Performing these operations on a typical CPU is expensive in terms of both power consumption and performance cycles.
The typical performance numbers for an Intel Penryn based 3.0GHz Quad Core machine show that WARP can in some cases outperform low-end integrated Direct3D 10 and later graphics GPUs on a number of benchmarks. Low-end discrete graphics hardware is typically 4 to 5 times faster than WARP at running these benchmarks. These low-end integrated or discrete GPUs have minimal use of CPU resources. Mid-range or high-end graphics cards are significantly faster than WARP for many applications, particularly when an application can take advantage of the parallelism and memory bandwidth that these graphics cards provide.
WARP is not a replacement for graphics hardware, particularly as reasonably performing low-end Direct3D 10 and later discrete hardware is now inexpensive. The goal of WARP is to allow applications to target Direct3D 10 level hardware without having significantly different code paths or testing requirements whether they run on hardware or in software.
The following two tables show WARP example data with various CPUs and graphics cards.
The first table shows WARP example data with Direct3D 10 Crysis running at 800x600 with all the quality settings on their lowest levels:
CPU | Time | Ave FPS | Min FPS | Min Frame | Max FPS | Max Frame |
---|---|---|---|---|---|---|
Core i7 8 Core @ 3.0GHz | 271.57 | 7.36 | 3.46 | 1966 | 15.01 | 995 |
Penryn 4 Core @ 3.0GHz | 351.35 | 5.69 | 2.49 | 1967 | 10.95 | 980 |
Penryn 2 Core @ 3.0GHz | 573.98 | 3.48 | 1.35 | 1964 | 6.61 | 988 |
Core 2 Duo @ 2.6GHz | 707.19 | 2.83 | 0.81 | 1959 | 5.18 | 982 |
Core 2 Duo @ 2.4GHz | 763.25 | 2.62 | 0.76 | 1964 | 4.70 | 984 |
Core 2 Duo @ 2.1GHz | 908.87 | 2.20 | 0.64 | 1965 | 3.72 | 986 |
Xeon 8 Core @ 2.0GHz | 424.04 | 4.72 | 1.84 | 1967 | 9.56 | 988 |
AMD FX74 4 Core @ 3.0GHz | 583.12 | 3.43 | 1.41 | 1967 | 5.78 | 986 |
Phenom 9550 4 Core @ 2.2GHz | 664.69 | 3.01 | 0.53 | 1959 | 5.46 | 987 |
The second table shows example data running the same test across a variety of graphics cards:
Graphics Card | Time | Ave FPS | Min FPS | Min Frame | Max FPS | Max Frame |
---|---|---|---|---|---|---|
NVIDIA 8800 GTS | 23.58 | 84.80 | 60.78 | 1957 | 130.83 | 1022 |
NVIDIA 8500 GT | 47.63 | 41.99 | 25.67 | 1986 | 72.57 | 991 |
NVIDIA Quadro 290 | 67.16 | 29.78 | 18.19 | 1969 | 49.87 | 1017 |
NVIDIA 8400 GS | 59.01 | 33.89 | 21.22 | 1962 | 51.82 | 1021 |
ATI 3400 | 53.79 | 37.18 | 22.97 | 618 | 59.77 | 1021 |
ATI 3200 | 67.19 | 29.77 | 18.91 | 1963 | 45.74 | 980 |
ATI 2400 PRO | 67.04 | 29.83 | 17.97 | 606 | 45.91 | 987 |
Intel DX10 Integrated | 386.94 | 5.17 | 1.74 | 1974 | 16.22 | 995 |
WARP Conformance
WARP passes all the standard Windows Hardware Quality Labs (WHQL) conformance tests for validating Direct3D hardware devices.
WARP has been tested against a suite of Direct3D 10 and Direct3D 10.1 applications and benchmarks, and against SDK samples from DirectX, NVIDIA, and AMD.
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WARP used the PIX debugging and analysis tool for Windows in its testing; Microsoft has a large library of single frame captures of applications that are used to compare between hardware and WARP. The majority of the images appear almost identical between hardware and WARP; where small differences sometimes occur, they are found to be within the tolerances defined by the Direct3D 10 specification.
Transform Warp
Updated in Photoshop 21.0 (November 2019 release)
The Warp command lets you drag control points to manipulate the shape of images, shapes, or paths, and so on. You can also warp using a shape in the Warp pop‑up menu in the options bar. Shapes in the Warp pop‑up menu are also malleable; you can drag their control points.
Check out this video tutorial by Julieanne Kost: New Transform Capabilities in Photoshop’s Warp Tool
When using the control points to distort an item, choosing View > Extras shows or hides the warp mesh and control points.
Select a layer or an area in the image you want to warp.
After making a selection, do one of the following:
Choose Edit > Transform > Warp or
Press Control + T (Win) / Command + T (Mac), then click the Switch Between Free Transform And Warp Modes button in the options bar.
To warp your selection using a warp preset, choose a warp style from the Warp pop‑up menu in the options bar.
To create a custom warp mesh, choose a grid size from the Grid pop-up menu in the options bar.
- Select a default grid size - 3 x 3, 4 x 4, or 5 x 5.
- Or, select Custom and then specify the numbers of Columns and Rows in the Custom Grid Size dialog.
To add more control grid lines to the warp mesh, choose an option to split the warp.
- Do any of the following:
- In the options bar, click any of the Split buttons.
- Choose Edit > Transform > Split Warp Horizontally, Split Warp Vertically, or Split Warp Crosswire.
- Move the pointer within mesh area and click where you place additional control grid lines.
As you move the pointer, over the warp mesh, you’ll see the split lines track the pointer. When you click, additional control points are added to the warp mesh.
Note:
You can also use the Alt (Win) / Option (Mac) modifier key to quickly toggle through the split warp options without returning to the menu bar.
- Hold down the Alt (Win) / Option (Mac) key and click anywhere the warp mesh to split the warp crosswire at that location.
- Hold down the Alt (Win) / Option (Mac) key and move the pointer near the edge of an existing horizontal grid line. Click to split the warp vertically at that location.
- Similarly, hold down the Alt (Win) / Option (Mac) key and move the pointer near the edge of an existing vertical grid line. Click to split the warp horizontally at that location.
- Do any of the following:
- To manipulate the shape, drag the control points, a segment of the bounding box or mesh, or an area within the mesh. When adjusting a curve, use the control point handles. This is similar to adjusting the handles in the curved segment of a vector graphic.
- Click on a grid line to activate control points for editing the warp. Click on an anchor point (at the intersection of the grid lines) lets you edit the control points surrounding that anchor. Drag the control points to warp the image.
- To select multiple points, Shift+click on the anchor points or click-and-drag the pointer over the points while holding down the Shift key. A rectangle appears around the selected points if two or more points are selected.
- To deselect multiple points, Shift+click on the active anchor points or click-and-drag the pointer over the active points while holding down the Shift key. The rectangle surrounding the selected points automatically resizes as points are selected or deselected.
- To delete a selected grid line (control points along the line are visible), press Delete or choose Edit > Transform > Remove Warp Split.
- To delete both the horizontal and vertical grid lines passing through an anchor point, click the anchor point, then press Delete or choose Edit > Transform > Remove Warp Split.
- To change the orientation of a warp style that you chose from the Warp menu, click the Change The Warp Orientation button in the options bar.
- To change the reference point, click a square on the Reference point locator in the options bar.
- To specify the amount of warp using numeric values, enter the values in the Bend (set bend), X (set horizontal distortion), and Y (set vertical distortion) text boxes in the options bar. You can’t enter numeric values if you have chosen None or Custom from the Warp Style pop‑up menu.
- To manipulate the shape, drag the control points, a segment of the bounding box or mesh, or an area within the mesh. When adjusting a curve, use the control point handles. This is similar to adjusting the handles in the curved segment of a vector graphic.
Press Enter (Windows) or Return(Mac OS), or click the Commit button in theoptions bar.
To cancel the transformation, press Esc or clickthe Cancel button inthe options bar.
When you warp a bitmap image (versus a shape or path), the image becomes slightly less sharp each time you commit a transformation; therefore, performing multiple commands before applying the cumulative transformation is preferable to applying each transformation separately.
Puppet Warp provides a visual mesh that lets you drastically distort specific image areas, while leaving other areas intact. Applications range from subtle image retouching (such as shaping hair) to total transformations (such as repositioning arms or legs).
In addition to image layers, you can apply Puppet Warp to layer and vector masks. To nondestructively distort images, use Smart Objects. (See Create Smart Objects.)
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In the Layers panel, select the layer or mask you wantto transform.
In the options bar, adjust the following mesh settings:
Determines the overall elasticity of the mesh.
Note:
Choose Distort for a highly elastic mesh good for warping wide-angle images or texture maps.
Determines the spacing of mesh points. More Points increases precisionbut requires more processing time; Fewer Points does the opposite.
Expands or contracts the outer edge of the mesh.
Deselect to show only adjustment pins, providing a clearer preview of your transformations.
Note:
To temporarily hide adjustment pins, press the H key.
In the image window, click to add pins to areas you wantto transform and areas you want to anchor in place.
Moving a pin on the puppet mesh. Adjoining pins keep nearby areas intact.To reposition or remove pins, do any of the following:
Drag pins to warp the mesh.
To reveal a mesh area you’ve overlapped with another, clickthe Pin Depth buttons inthe options bar.
To remove selected pins, press Delete. To remove other individualpins, place the cursor directly over them, and press Alt (Windows)or Option (Mac OS); when the scissors icon appears,click.
Click the Remove All Pins button inthe options bar.
Note:
To select multiplepins, Shift-click them or choose Select All fromthe context menu.
To rotate the mesh around a pin, select it, and then do eitherof the following:
To rotate the mesh a fixed number of degrees, press Alt (Windows) or Option (Mac OS), and position the cursor near to, but not over the pins. When a circle appears, drag to visually rotate the mesh.
Note:
The degree of rotation appears in the options bar.
- To rotate the mesh automatically based on the selected Mode option, choose Auto from the Rotate menu in the options bar.
When your transformation is complete, press Enter or Return.