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# MShaderManager Class Reference
OpenMayaRender - API module for rendering

This reference page is linked to from the following overview topics: データ クラス(Data Classes), レンダリング オーバーライド(Rendering Overrides), フレームワーク クラス(Framework Classes).

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## Detailed Description

Provides access to MShaderInstance objects for use in Viewport 2.0.

This class generates MShaderInstance objects for use with user-created MRenderItem objects. Any MShaderInstance objects created by this class are owned by the caller.

The methods for adding shader and shader include paths will allow for additional search paths to be used with the "getEffectsFileShader()" method which searches for shader files on disk. The default search path is in the "Cg" and "HLSL" folders found in the runtime directory. It is recommended that user defined shaders not reside at this location to avoid any potential shader conflicts.

When acquiring a shader instance the caller may also specify pre-draw and post-draw callback functions. These functions will be invoked any time a render item that uses the shader instance is about to be drawn. These callbacks are passed an MDrawContext object as well as the render item being drawn and may alter the draw state in order to get different rendering effects. Accessing Maya nodes from within these callbacks is an error and may result in instability.

`#include <MShaderManager.h>`

List of all members.

## Public Types
enum | MStockShader { k3dSolidShader, k3dBlinnShader }
| Name of an available "stock" shader. More...
## Public Member Functions
MStatus | addShaderPath (const MString &path) const
| Add a path to the list of shader search paths.
MStatus | shaderPaths (MStringArray &paths) const
| Query the list of shader search paths.
MStatus | addShaderIncludePath (const MString &path) const
| Add a path to the list of paths used for searching for shader include files.
MStatus | shaderIncludePaths (MStringArray &paths) const
| Query the list of search paths user for searching for shader include files.
MShaderInstance * | getEffectsFileShader (const MString &effectsFileName, const MString &techniqueName, MShaderCompileMacro *macros=0, unsigned int numberOfMacros=0, bool useEffectCache=true, MShaderInstance::DrawCallback preCb=0, MShaderInstance::DrawCallback postCb=0) const
| Get a new instance of a shader generated from an effects file stored on disk.
MShaderInstance * | getStockShader (MStockShader name, MShaderInstance::DrawCallback preCb=0, MShaderInstance::DrawCallback postCb=0) const
| Get a new instance of a stock shader.
## Static Public Member Functions
static bool | isSupportedShaderSemantic (const MString &value)
| Return if a given string is a supported shader semantic.
static const char * | className ()
| Returns the name of this class.

## Member Enumeration Documentation

enum MStockShader

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Name of an available "stock" shader.

Enumerator:

  k3dSolidShader | A solid color shader for 3d rendering. Search for all occurrences
  k3dBlinnShader | A stock Blinn shader for 3d rendering. Search for all occurrences

## Member Function Documentation

MStatus addShaderPath | ( | const MString & | path | ) | const

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Add a path to the list of shader search paths.

Parameters:

  [in] | path | Shader search path.

Returns:
  Status code

Status Codes:
  - MS::kSuccess The path was added.
  - MS::kFailure The path could not be added.

MStatus shaderPaths | ( | MStringArray & | paths | ) | const

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Query the list of shader search paths.

Parameters:

  [out] | paths | A string array which is filled in with search path strings. Each array element will contain one shader path string.

Returns:
  Status code

Status Codes:
  - MS::kSuccess The paths could be retrieved.
  - MS::kFailure The paths could not be retrieved.

MStatus addShaderIncludePath | ( | const MString & | path | ) | const

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Add a path to the list of paths used for searching for shader include files.

Parameters:

  [in] | path | Shader include path.

Returns:
  Status code

Status Codes:
  - MS::kSuccess The path was added.
  - MS::kFailure The path could not be added.

MStatus shaderIncludePaths | ( | MStringArray & | paths | ) | const

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Query the list of search paths user for searching for shader include files.

Parameters:

  [out] | paths | A string array which is filled in with search path strings. Each array element will contain one shader include path string.

Returns:
  Status code

Status Codes:
  - MS::kSuccess The paths could be retrieved.
  - MS::kFailure The paths could not be retrieved.

MShaderInstance * getEffectsFileShader | ( | const MString & | effectsFileName,
|  | const MString & | techniqueName,
|  | MShaderCompileMacro * | macros = `0`,
|  | unsigned int | numberOfMacros = `0`,
|  | bool | useEffectCache = `true`,
|  | MShaderInstance::DrawCallback | preCb = `0`,
|  | MShaderInstance::DrawCallback | postCb = `0`
| ) |  | const

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Get a new instance of a shader generated from an effects file stored on disk.

If a file extension is not supplied as part of the file name argument then the following strings are appended to the file name based on the drawing API which is currently being used by the renderer:

- If the underlying drawing API is OpenGL then ".cgfx" is appended.

Callers of this method assume lifetime management of the returned object.

Optionally, a pre-draw and post-draw callback function may be associated with the shader. The callbacks will be invoked any time a render item using the shader is drawn.

Parameters:

  [in] | effectsFileName | The effects file
  [in] | techniqueName | The name of a technique in the effects file. If an empty string is specified then the first technique in the effects file will be used.
  [in] | macros | Pointer to an array of shader macros structures. The default value is 0, meaning that no macros are specified.
  [in] | numberOfMacros | Number of macros. The default value is 0.
  [in] | useEffectCache | Use the internal effect cache to prevent reloading the effect file every time it is requested. Unless you are changing the effect, this should always be set to true for maximum performance.
  [in] | preCb | A pointer to the function to be called before render items are drawn with this shader.
  [in] | postCb | A pointer to the function to be called after render items are drawn with this shader.

Returns:
  A pointer to a shader instance for the effects file, or NULL on failure

MShaderInstance * getStockShader | ( | MStockShader | name,
|  | MShaderInstance::DrawCallback | preCb = `0`,
|  | MShaderInstance::DrawCallback | postCb = `0`
| ) |  | const

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Get a new instance of a stock shader.

Callers of this method assume lifetime management of the returned object.

Optionally, a pre-draw and post-draw callback function may be associated with the shader. The callbacks will be invoked any time a render item using the shader is drawn.

Parameters:

  [in] | name | Name of stock shader
  [in] | preCb | A pointer to the function to be called before render items are drawn with this shader.
  [in] | postCb | A pointer to the function to be called after render items are drawn with this shader.

Returns:
  A pointer to an instance of the requested shader, or NULL on failure

bool isSupportedShaderSemantic | ( | const MString & | value | ) | `[static]`

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Return if a given string is a supported shader semantic.

To be supported means that, for a shader parameter which has this semantic, the renderer will automatically set the parameter's value before the shader is used for rendering.

The plugin writer should not be explicitly setting the values for parameters with supported shader semantics.

For example a matrix parameter with the "projection" semantic will have its value updated with the current camera projection matrix before the shader is used.

Parameters:

  value | String to check

Returns:
  True if the string is a supported.

const char * className | ( |  | ) | `[static]`

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Returns the name of this class.

Returns:
  Name of this class.

MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager
MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager MShaderManager