Forests::ColorMap Class Reference

A 2D greyscale image that is assigned to a certain region of your world to represent color levels. More...

#include <PropertyMaps.h>

Public Member Functions
void	unload ()
void	setFilter (MapFilter filter)
	Sets the filtering mode used for this color map. More...
MapFilter	getFilter ()
	Returns the filtering mode being used for this color map.
Ogre::PixelBox	getPixelBox ()
	Gets a pointer to the pixel data of the color map. More...
Ogre::uint32	getColorAt (Ogre::Real x, Ogre::Real z, const Ogre::TRect< Ogre::Real > &mapBounds)
	Gets the color value at the specified position. More...
Ogre::ColourValue	getColorAt_Unpacked (Ogre::Real x, Ogre::Real z, const Ogre::TRect< Ogre::Real > &mapBounds)
	Gets the color value at the specified position. More...

Static Public Member Functions
static ColorMap *	load (const Ogre::String &fileName, MapChannel channel=CHANNEL_COLOR)
static ColorMap *	load (Ogre::TexturePtr texture, MapChannel channel=CHANNEL_COLOR)

Detailed Description

A 2D greyscale image that is assigned to a certain region of your world to represent color levels.

This class is used by various PagedLoader's internally, so it's not necessary to learn anything about this class. However, you can achieve more advanced effects through the ColorMap class interface than you can with the standard GrassLayer color map functions, for example.

Probably the most useful function in this class is getPixelBox(), which you can use to directly manipulate the color map pixels in real-time.

Member Function Documentation

void Forests::ColorMap::setFilter ( MapFilter  filter )

inline

Sets the filtering mode used for this color map.

This function can be used to set the filtering mode used for your color map. By default, bilinear filtering is used (MAPFILTER_BILINEAR). If you disable filtering by using MAPFILTER_NONE, the resulting coloration may appear slightly pixelated, depending on the resolution of the map.

MAPFILTER_NONE is slightly faster than MAPFILTER_BILINEAR, so use it if you don't notice any considerable pixelation.

Referenced by Forests::TreeLoader3D::setColorMapFilter(), and Forests::TreeLoader2D::setColorMapFilter().

Ogre::PixelBox Forests::ColorMap::getPixelBox ( )

inline

Gets a pointer to the pixel data of the color map.

You can use this function to access the pixel data of the color map. The PixelBox returned is an image in PF_A8R8G8B8 format when running with DirectX, and PF_A8B8G8R8 when running with OpenGL. You can modify this image any way you like in real-time, so long as you do not change the byte format.

This function is useful in editors where the color map needs to be changed dynamically. Note that although you can change this map in real-time, the changes won't be uploaded to your video card until you call PagedGeometry::reloadGeometry(). If you don't, the grass you see will remain unchanged.

Ogre::uint32 Forests::ColorMap::getColorAt ( Ogre::Real  x, Ogre::Real  z, const Ogre::TRect< Ogre::Real > &  mapBounds  )

inline

Gets the color value at the specified position.

A RenderSystem-specific 32-bit packed color value is used, so it can be fed directly to the video card.

The boundary given defines the area where this color map takes effect. Normally this is set to your terrain's bounds so the color map is aligned to your heightmap, but you could apply it anywhere you want.

Referenced by Forests::GrassLoader::unloadPage().

Ogre::ColourValue Forests::ColorMap::getColorAt_Unpacked ( Ogre::Real  x, Ogre::Real  z, const Ogre::TRect< Ogre::Real > &  mapBounds  )

inline

Gets the color value at the specified position.

The unpacks the 32-bit color value into an Ogre::ColourValue and returns it.

References Ogre::RenderSystem::getColourVertexElementType(), Ogre::Root::getRenderSystem(), Ogre::Root::getSingleton(), and Ogre::VET_COLOUR_ARGB.