Shader
Functions
Shader * |
|
Detailed Description
-
class Shader : public RED::Object, public RED::IChunkSaver
Master shader class. Defines the way elements are rendered.
@related The Shading Pipeline, Registering and Adding a Shader to a Material Pass, class RED::IMaterial, class RED::RenderShader, class RED::StateShader, class RED::RenderCode
Shaders are objects involved during the construction of a material for the rendering of shapes in a scene. A shape owns one single material that defines the way it’ll be rendered and react to lighting.
There are two kind of shaders beyond the Shader class, which is a generic object:
The RED::RenderShader: this shader defines the rendering operations to perform. This shader uses vertex and pixel programs and define the way they are configured.
The RED::StateShader: this shader defines a render state to apply to the processing of the forthcoming shaders. For example, change in the blending equation, disarm of z-buffer testing or any other state management operation are managed through it.
Shaders are assembled in lists defining the rendering sequences of a material. As explained in the \ref bk_buildingmaterials book, there are three basic rendering sequences: pre-lighting, lighting and post-lighting, so a given material may have three separate shader lists (plus other special lists for dedicated shading purposes).
Shaders can’t be shared amongst materials, but can be shared amongst passes in the same material. Materials can be shared by many shapes.
RED::RenderShader and RED::StateShader shaders classes instances support platform selection, which enables the same shader to behave in a way that is specific to a given graphical hardware.
Subclassed by RED::RenderShader, RED::StateShader
Public Functions
-
SET_CID(CID_class_REDShader)
-
IMPLEMENT_AS()
-
Shader()
Constructor.
-
virtual Shader *Clone() const = 0
Object duplication.
This method must return a full copy of ‘this’.
- Returns
A duplicate of ‘this’.
-
virtual RED_RC UpdateFrom(const RED::Object &iShader, const RED::State &iState, int iSrcStateNumber) = 0
Updates the instance with the content of the given one.
- Parameters
iShader – Pointer to the source shader.
iState – Transaction parameter.
iSrcStateNumber – Transaction at which the source shader must be evaluated.
- Returns
RED_OK on success,
RED_ALLOC_FAILURE on memory allocation error,
RED_FAILED otherwise.
-
virtual ~Shader()
Destructor.
-
virtual RED_RC GetOperationStream(const RED::Object *iCaller, RED::Vector<int> &ioStream, RED::HARDWARE_PLATFORM iPlatformId) const
Gets the operation stream of a shader.
Internal RED usage method. Writes down the shader stream.
- Parameters
iCaller – Pointer to the method caller.
ioStream – Stream to write to.
iPlatformId – Target hardware platform identifier.
- Returns
RED_OK when the shader write all its streams,
RED_ALLOC_FAILURE if an internal allocation did fail,
RED_FAIL otherwise.
