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Crystal Space 3D engine
Copyright (C) 2000 by Jorrit Tyberghein
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CS_IGEOM_DECAL_H__
#define __CS_IGEOM_DECAL_H__
#include "csutil/scf.h"
#include "csutil/array.h"
#include "ivideo/graph3d.h"
#include "ivideo/rendermesh.h"
struct iSector;
struct iMaterialWrapper;
struct iMeshWrapper;
class csVector3;
class csVector2;
class csPoly3D;
class csColor4;
class csRenderBuffer;
/**\file
* Decal and Decal manager interfaces
*/
/**
* \addtogroup geom_utils
* @{ */
/**\name Decals
* @{ */
/**
* A decal created by the iDecalManager. Decals somehow add a piece of geometry projected
* on a mesh or a group of mesh. It can be used to achieve effects such as bullet holes or
* shadows under the characters.
*/
struct iDecal
{
};
/**
* Interface for a decal template which dictates the
* appearance of a newly created iDecal.
*/
struct iDecalTemplate : public virtual iBase
{
SCF_INTERFACE(iDecalTemplate, 2, 0, 0);
/**
* Retrieves the time the decal will have to live in seconds before it is
* killed.
* \return The time to live in seconds.
*/
virtual float GetTimeToLive () const = 0;
/**
* Retrieves the material wrapper to use for this decal.
* \return the material wrapper.
*/
virtual iMaterialWrapper* GetMaterialWrapper () = 0;
/**
* Retrieves the rendering priority for this decal
* \return the rendering priority.
*/
virtual CS::Graphics::RenderPriority GetRenderPriority () const = 0;
/**
* Retrieves the z-buffer mode for this decal.
* \return the z-buffer mode.
*/
virtual csZBufMode GetZBufMode () const = 0;
/**
* Retrieves the polygon normal threshold for this decal.
*
* Values close to 1 will exclude polygons that don't match the decal's
* normal closely, and values closer to 0 will be more accepting and allow
* polygons with a very different normal from the decal's normal.
*
* Values between -1 and 0 are acceptable, but will allow polygons that
* are facing in the opposite direction from the decal to be included.
*
* \return the polygon threshold.
*/
virtual float GetPolygonNormalThreshold() const = 0;
/**
* A decal will be offset a bit from the geometry it wraps around in order
* to avoid z-buffer fighting issues.
*
* The greater this offset is, the less chance there is of z fighting, but
* if this is too high then the decal will appear to be floating.
*
* \return the decal offset.
*/
virtual float GetDecalOffset () const = 0;
/**
* Determines whether or not this type of decal will have its geometry
* clipped against a plane above the decal.
* \return True if top clipping is enabled.
*/
virtual bool HasTopClipping () const = 0;
/**
* Gets the distance between the decal position and the top clipping plane
* as a multiple of decal size.
* \return The top clipping plane scale.
*/
virtual float GetTopClippingScale () const = 0;
/**
* Determines whether or not this type of decal will have its geometry
* clipped against a plane below the decal.
* \return True if bottom clipping is enabled.
*/
virtual bool HasBottomClipping () const = 0;
/**
* Gets the distance between the decal position and the bottom clipping
* plane as a multiple of decal size.
* \return The bottom clipping plane scale.
*/
virtual float GetBottomClippingScale () const = 0;
/**
* The min tex coord is the uv coordinate of the top-left corner of the
* decal.
* \return The min tex coordinate.
*/
virtual const csVector2& GetMinTexCoord () const = 0;
/**
* The main color of the decal.
* \return The main color of the decal.
*/
virtual const csColor4& GetMainColor () const = 0;
/**
* The color to give vertices close to the top of the decal. The color of
* a vertex between the decal position and the top plane will be interpolated
* between this color and the main color based on distance from the top plane.
* \return The top color of the decal.
*/
virtual const csColor4& GetTopColor () const = 0;
/**
* The color to give vertices close to the bottom of the decal. The color of
* a vertex between the decal position and the bottom plane will be interpolated
* between this color and the main color based on distance from the bottom plane.
* \return The top color of the decal.
*/
virtual const csColor4& GetBottomColor () const = 0;
/**
* The max tex coord is the uv coordinate of the bottom-right corner of the
* decal.
* \return The max tex coordinate.
*/
virtual const csVector2& GetMaxTexCoord () const = 0;
/**
* The mixmode of the decal.
* \return The mixmode.
*/
virtual const uint GetMixMode () const = 0;
/**
* The perpendicular face threshold specifies which faces are considered
* to be perpendicular in the decal. Perpendicular faces will be tapered
* outwards by an amount relative to the perpendicular face offset.
* \return The perpendicular face threshold.
*/
virtual float GetPerpendicularFaceThreshold () const = 0;
/**
* The perpendicular face offset specifies how much perpendicular faces in
* the decal will taper out. The bottom of the perpendicular face will
* taper out by the amount given, but the top of the perpendicular face
* will not taper at all.
* \return The perpendicular face offset.
*/
virtual float GetPerpendicularFaceOffset () const = 0;
/**
* Sets the time the decal will have to live in seconds before it is
* killed.
* \param timeToLive The time to live in seconds.
*/
virtual void SetTimeToLive (float timeToLive) = 0;
/**
* Sets the material wrapper to use for this decal.
* \param material The material wrapper of the decal.
*/
virtual void SetMaterialWrapper (iMaterialWrapper* material) = 0;
/**
* Sets the rendering priority for this decal
* \param renderPriority The render priority of the decal.
*/
virtual void SetRenderPriority (CS::Graphics::RenderPriority renderPriority) = 0;
/**
* Sets the z-buffer mode for this decal.
* \param mode The z-buffer mode for the decal.
*/
virtual void SetZBufMode (csZBufMode mode) = 0;
/**
* Sets the polygon normal threshold for this decal.
*
* Values close to 1 will exclude polygons that don't match the decal's
* normal closely, and values closer to 0 will be more accepting and allow
* polygons with a very different normal from the decal's normal.
*
* Values between -1 and 0 are acceptable, but will allow polygons that
* are facing in the opposite direction from the decal to be included.
*
* \param polygonNormalThreshold The polygon normal threshold.
*/
virtual void SetPolygonNormalThreshold (float polygonNormalThreshold) = 0;
/**
* A decal will be offset a bit from the geometry it wraps around in order
* to avoid z-buffer fighting issues.
*
* The greater this offset is, the less chance there is of z fighting, but
* if this is too high then the decal will appear to be floating.
*
* \param decalOffset The distance between decal and the geometry.
*/
virtual void SetDecalOffset (float decalOffset) = 0;
/**
* Enables or disables clipping geometry above the decal.
* \param enabled True if top clipping should be enabled.
* \param topPlaneScale The distance from the decal position to the
* top plane as a multiple of decal size.
*/
virtual void SetTopClipping (bool enabled, float topPlaneScale = 0.0f) = 0;
/**
* Enables or disables clipping geometry below the decal.
* \param enabled True if bottom clipping should be enabled.
* \param bottomPlaneScale The distance from the decal position to the
* bottom plane as a multiple of decal size.
*/
virtual void SetBottomClipping (bool enabled, float bottomPlaneScale) = 0;
/**
* The tex coords are the uv coordinate of the top-left and bottom-right
* corner of the decal.
* \param min The top-left corner of the decal.
* \param max The bottom-right corner of the decal.
*/
virtual void SetTexCoords (const csVector2& min, const csVector2& max) = 0;
/**
* The mixmode of the decal.
* \param mixMode The mixmode of the decal.
*/
virtual void SetMixMode (uint mixMode) = 0;
/**
* The perpendicular face threshold specifies which faces are considered
* to be perpendicular in the decal. Perpendicular faces will be tapered
* outwards by an amount relative to the perpendicular face offset.
* \param threshold The new perpendicular face threshold.
*/
virtual void SetPerpendicularFaceThreshold (float threshold) = 0;
/**
* The perpendicular face offset specifies how much perpendicular faces in
* the decal will taper out. The bottom of the perpendicular face will
* taper out by the amount given, but the top of the perpendicular face
* will not taper at all.
* \param offset The new perpendicular face offset.
*/
virtual void SetPerpendicularFaceOffset (float offset) = 0;
/**
* The main color of the decal.
* \param color The main color of the decal.
*/
virtual void SetMainColor (const csColor4& color) = 0;
/**
* The color to give vertices close to the top of the decal. The color of
* a vertex between the decal position and the top plane will be interpolated
* between this color and the main color based on distance from the top plane.
* \param color The top color of the decal.
*/
virtual void SetTopColor (const csColor4& color) = 0;
/**
* The color to give vertices close to the bottom of the decal. The color of
* a vertex between the decal position and the bottom plane will be interpolated
* between this color and the main color based on distance from the bottom plane.
* \param color The top color of the decal.
*/
virtual void SetBottomColor (const csColor4& color) = 0;
/**
* Set whether or not the decal will do any clipping. This has to be enabled for
* SetTopClipping() and SetBottomClipping() being used. Default value is true.
*/
virtual void SetClipping (bool enabled) = 0;
/**
* Get whether or not the decal will do any clipping.
*/
virtual bool HasClipping () const = 0;
};
/**
* A decal animation control, to be used by the iMeshObject when the vertices
* of the decal have to be animated.
*/
struct iDecalAnimationControl
{
virtual ~iDecalAnimationControl () {}
/**
* Update the vertices and normals of the decal.
* \param decalTemplate The template of the decal
* \param baseIndex The starting index of the vertices and normals that have
* to be updated in the render buffers provided.
* \param indices The indices of the iMeshObject corresponding to the indices
* of the decal. These are the list of the indices provided in
* iDecalBuilder::AddStaticPoly().
* \param vertices The vertices of the decal that need to be updated
* \param normals The normals of the decal that need to be updated
*/
virtual void UpdateDecal (iDecalTemplate* decalTemplate,
size_t baseIndex,
csArray<size_t>& indices,
csRenderBuffer& vertices,
csRenderBuffer& normals) = 0;
};
/**
* Interface for mesh objects to use to build decals for
* their mesh object.
*/
struct iDecalBuilder
{
virtual ~iDecalBuilder () {}
/**
* Adds a static polygon to the decal. The decal builder
* will build geometry for this polygon and append it to
* the mesh's extra rendermesh list.
* \param polygon The polygon to add to the decal.
* \param indices The indices of the vertices of the iMeshObject corresponding to
* the vertices of the given polygon. This has to be provided only if you use an
* iDecalAnimationControl.
*/
virtual void AddStaticPoly (const csPoly3D& polygon, csArray<size_t>* indices = 0) = 0;
/**
* Set the animation controller for this decal.
*/
virtual void SetDecalAnimationControl (iDecalAnimationControl* animationControl) = 0;
};
/**
* Creates and manages decals.
*
* To create a iDecal, just get access to this plugin using
* csLoadPluginCheck<iDecalManager>
*
* Then, just use one of the decal creation functions:
* - iDecalManager::CreateDecal()
*/
struct iDecalManager : public virtual iBase
{
SCF_INTERFACE (iDecalManager, 2, 0, 0);
/**
* Creates a decal that can be shared among several meshes.
* \param decalTemplate The template used to create the decal.
* \param sector The sector to begin searching for nearby meshes.
* \param pos The position of the decal in world coordinates.
* \param up The up direction of the decal in world coordinates.
* \param normal The overall normal of the decal in world coordinates.
* \param width The width of the decal.
* \param height The height of the decal.
* \param oldDecal An existing decal that can be reused for efficiency
* (it will therefore disappear from its previous position).
* \return True if the decal is created.
*/
virtual iDecal* CreateDecal (iDecalTemplate* decalTemplate,
iSector* sector, const csVector3& pos, const csVector3& up,
const csVector3& normal, float width = 1.0f, float height = 1.0f,
iDecal* oldDecal = 0) = 0;
/**
* Creates a decal template and fills it with default values.
* \param material The material wrapper for this decal template.
* \return The newly created decal template.
*/
virtual csRef<iDecalTemplate> CreateDecalTemplate (
iMaterialWrapper* material) = 0;
/**
* Deletes the given decal.
* \param decal The decal to be deleted.
*/
virtual void DeleteDecal (const iDecal* decal) = 0;
/**
* Gets the number of decals.
* \return The number of decals.
*/
virtual size_t GetDecalCount () const = 0;
/**
* Gets the specified decal.
* \param idx The index of the decal to get, must be between 0 and
* GetDecalCount()-1
*/
virtual iDecal* GetDecal (size_t idx) const = 0;
/**
* Creates a decal on a specific mesh.
* \param decalTemplate The template used to create the decal.
* \param mesh The mesh to put the decal on.
* \param pos The position of the decal in world coordinates.
* \param up The up direction of the decal in world coordinates.
* \param normal The overall normal of the decal in world coordinates.
* \param width The width of the decal.
* \param height The height of the decal.
* \param oldDecal An existing decal that can be reused for efficiency
* (it will therefore disappear from its previous position).
* \return True if the decal is created.
*/
virtual iDecal* CreateDecal (iDecalTemplate* decalTemplate,
iMeshWrapper* mesh, const csVector3& pos, const csVector3& up,
const csVector3& normal, float width = 1.0f, float height = 1.0f,
iDecal* oldDecal = 0) = 0;
};
/** @} */
/** @} */
#endif // __CS_IGEOM_DECAL_H__
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