SoLazyElement(3)

NAME
SoLazyElement - The SoLazyElement class is used to handle material and shape properties.

So[GL]LazyElement is, as the name implies, an element that is lazy about sending things to OpenGL. The changes are not sent to OpenGL until SoGLLazyElement::send() is called. This means that you can change the state of certain attributes several times, but the state will only be sent to OpenGL once.

SYNOPSIS

#include <Inventor/elements/SoLazyElement.h>

Inherits SoElement.

Inherited by SoGLLazyElement.

  Public Types
enum cases { LIGHT_MODEL_CASE = 0, COLOR_MATERIAL_CASE, DIFFUSE_CASE, AMBIENT_CASE, EMISSIVE_CASE, SPECULAR_CASE, SHININESS_CASE, BLENDING_CASE, TRANSPARENCY_CASE, VERTEXORDERING_CASE, TWOSIDE_CASE, CULLING_CASE, SHADE_MODEL_CASE, GLIMAGE_CASE, ALPHATEST_CASE, LAZYCASES_LAST }
enum masks { LIGHT_MODEL_MASK = 1 << LIGHT_MODEL_CASE, COLOR_MATERIAL_MASK = 1 << COLOR_MATERIAL_CASE, DIFFUSE_MASK = 1 << DIFFUSE_CASE, AMBIENT_MASK = 1 << AMBIENT_CASE, EMISSIVE_MASK = 1<<EMISSIVE_CASE, SPECULAR_MASK = 1 << SPECULAR_CASE, SHININESS_MASK = 1 << SHININESS_CASE, TRANSPARENCY_MASK = 1 << TRANSPARENCY_CASE, BLENDING_MASK = 1 << BLENDING_CASE, VERTEXORDERING_MASK = 1 << VERTEXORDERING_CASE, TWOSIDE_MASK = 1 << TWOSIDE_CASE, CULLING_MASK = 1 << CULLING_CASE, SHADE_MODEL_MASK = 1 << SHADE_MODEL_CASE, GLIMAGE_MASK = 1 << GLIMAGE_CASE, ALPHATEST_MASK = 1 << ALPHATEST_CASE, ALL_MASK = (1 << LAZYCASES_LAST)-1 }
enum internalMasks { OTHER_COLOR_MASK = AMBIENT_MASK|EMISSIVE_MASK|SPECULAR_MASK|SHININESS_MASK, ALL_COLOR_MASK = OTHER_COLOR_MASK|DIFFUSE_MASK, NO_COLOR_MASK = ALL_MASK & (~ALL_COLOR_MASK), ALL_BUT_DIFFUSE_MASK = ALL_MASK &(~ DIFFUSE_MASK), DIFFUSE_ONLY_MASK = ALL_MASK &(~ OTHER_COLOR_MASK) }
enum LightModel { BASE_COLOR, PHONG }
enum VertexOrdering { CW, CCW }

  Public Member Functions
virtual void init (SoState *state)
virtual void push (SoState *state)
virtual SbBool matches (const SoElement *) const
virtual SoElement * copyMatchInfo (void) const
int32_t getNumDiffuse (void) const
int32_t getNumTransparencies (void) const
int32_t getNumColorIndices (void) const
SbBool isPacked (void) const
SbBool isTransparent (void) const
const uint32_t * getPackedPointer (void) const
const SbColor * getDiffusePointer (void) const
const int32_t * getColorIndexPointer (void) const
const float * getTransparencyPointer (void) const

  Static Public Member Functions
static SoType getClassTypeId (void)
static int getClassStackIndex (void)
static void * createInstance (void)
static void initClass ()
static void setToDefault (SoState *state)
static void setDiffuse (SoState *state, SoNode *node, int32_t numcolors, const SbColor *colors, SoColorPacker *packer)
static void setTransparency (SoState *state, SoNode *node, int32_t numvalues, const float *transparency, SoColorPacker *packer)
static void setPacked (SoState *state, SoNode *node, int32_t numcolors, const uint32_t *colors, const SbBool packedtransparency=FALSE)
static void setColorIndices (SoState *state, SoNode *node, int32_t numindices, const int32_t *indices)
static void setAmbient (SoState *state, const SbColor *color)
static void setEmissive (SoState *state, const SbColor *color)
static void setSpecular (SoState *state, const SbColor *color)
static void setShininess (SoState *state, float value)
static void setColorMaterial (SoState *state, SbBool value)
static void enableBlending (SoState *state, int sfactor, int dfactor)
static void enableSeparateBlending (SoState *state, int sfactor, int dfactor, int alpha_sfactor, int alpha_dfactor)
static void disableBlending (SoState *state)
static void setLightModel (SoState *state, const int32_t model)
static void setVertexOrdering (SoState *state, VertexOrdering ordering)
static void setBackfaceCulling (SoState *state, SbBool onoff)
static void setTwosideLighting (SoState *state, SbBool onoff)
static void setShadeModel (SoState *state, SbBool flatshading)
static void setGLImageId (SoState *state, uint32_t glimageid, SbBool alphatest)
static void setAlphaTest (SoState *state, SbBool onoff)
static const SbColor & getDiffuse (SoState *state, int index)
static float getTransparency (SoState *, int index)
static const uint32_t * getPackedColors (SoState *)
static const int32_t * getColorIndices (SoState *)
static int32_t getColorIndex (SoState *, int num)
static const SbColor & getAmbient (SoState *)
static const SbColor & getEmissive (SoState *)
static const SbColor & getSpecular (SoState *)
static float getShininess (SoState *)
static SbBool getColorMaterial (SoState *)
static SbBool getBlending (SoState *, int &sfactor, int &dfactor)
static SbBool getAlphaBlending (SoState *, int &sfactor, int &dfactor)
static int32_t getLightModel (SoState *)
static SbBool getAlphaTest (SoState *state)
static SoLazyElement * getInstance (SoState *state)
static float getDefaultAmbientIntensity (void)
static SbColor getDefaultDiffuse (void)
static SbColor getDefaultAmbient (void)
static SbColor getDefaultSpecular (void)
static SbColor getDefaultEmissive (void)
static float getDefaultShininess (void)
static uint32_t getDefaultPacked (void)
static float getDefaultTransparency (void)
static int32_t getDefaultLightModel (void)
static int32_t getDefaultColorIndex (void)
static void setMaterials (SoState *state, SoNode *node, uint32_t bitmask, SoColorPacker *cPacker, const SbColor *diffuse, const int numdiffuse, const float *transp, const int numtransp, const SbColor &ambient, const SbColor &emissive, const SbColor &specular, const float shininess, const SbBool istransparent)
static SoLazyElement * getWInstance (SoState *state)
static void setTransparencyType (SoState *state, int32_t type)

  Protected Member Functions
virtual void lazyDidSet (uint32_t mask)
virtual void lazyDidntSet (uint32_t mask)
virtual void setDiffuseElt (SoNode *, int32_t numcolors, const SbColor *colors, SoColorPacker *packer)
virtual void setPackedElt (SoNode *node, int32_t numcolors, const uint32_t *colors, const SbBool packedtransparency)
virtual void setColorIndexElt (SoNode *node, int32_t numindices, const int32_t *indices)
virtual void setTranspElt (SoNode *node, int32_t numtransp, const float *transp, SoColorPacker *packer)
virtual void setTranspTypeElt (int32_t type)
virtual void setAmbientElt (const SbColor *color)
virtual void setEmissiveElt (const SbColor *color)
virtual void setSpecularElt (const SbColor *color)
virtual void setShininessElt (float value)
virtual void setColorMaterialElt (SbBool value)
virtual void enableBlendingElt (int sfactor, int dfactor, int alpha_sfactor, int alpha_dfactor)
virtual void disableBlendingElt (void)
virtual void setLightModelElt (SoState *state, int32_t model)
virtual void setMaterialElt (SoNode *node, uint32_t bitmask, SoColorPacker *packer, const SbColor *diffuse, const int numdiffuse, const float *transp, const int numtransp, const SbColor &ambient, const SbColor &emissive, const SbColor &specular, const float shininess, const SbBool istransparent)
virtual void setVertexOrderingElt (VertexOrdering ordering)
virtual void setBackfaceCullingElt (SbBool onoff)
virtual void setTwosideLightingElt (SbBool onoff)
virtual void setShadeModelElt (SbBool flatshading)
virtual void setGLImageIdElt (uint32_t glimageid, SbBool alphatest)
virtual void setAlphaTestElt (SbBool onoff)

  Protected Attributes
struct SoLazyElement::CoinState coinstate

  Additional Inherited Members

Detailed Description

The SoLazyElement class is used to handle material and shape properties.

So[GL]LazyElement is, as the name implies, an element that is lazy about sending things to OpenGL. The changes are not sent to OpenGL until SoGLLazyElement::send() is called. This means that you can change the state of certain attributes several times, but the state will only be sent to OpenGL once. When creating a new shape node in Coin, it's a common operation to modify the OpenGL diffuse color. There are several ways you can send the color to OpenGL. If you're not going to use the color outside your node, you can just as well send it using plain OpenGL. You can also set the color in the element, and then force a send by using SoGLLazyElement::send(state, SoLazyElement::DIFFUSE_MASK).

However, when creating an extension shape node, it's always recommended to create an instance of SoMaterialBundle on the stack. If this instance is created after you update SoLazyElement with a new color, the new color will be sent to OpenGL when you call SoMaterialBundle::sendFirst(). This call will also update all other lazy OpenGL state, and it's actually required to either use SoMaterialBundle::sendFirst() or call SoGLLazyElement::send(state, SoLazyElement::ALL_MASK) when creating a shape node.

If you decide to send the color to OpenGL using glColor*(), you should notify SoGLLazyElement about this by calling SoGLLazyElement::reset(state, SoLazyElement::DIFFUSE_MASK). This will notify SoGLLazyElement that the current OpenGL diffuse color is unknown.

Member Function Documentation

  void * SoLazyElement::createInstance (void) [static]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  void SoLazyElement::initClass (void) [static]
This static method initializes static data for the SoDiffuseColorElement class.

  void SoLazyElement::init (SoState * state) [virtual]
This function initializes the element type in the given SoState. It is called for the first element of each enabled element type in SoState objects.

Reimplemented from SoElement.

Reimplemented in SoGLLazyElement.

  void SoLazyElement::push (SoState * state) [virtual]
This method is called every time a new element is required in one of the stacks. This happens when a writable element is requested, using SoState::getElement() or indirectly SoElement::getElement(), and the depth of the current element is less than the state depth.

Override this method if your element needs to copy data from the previous top of stack. The push() method is called on the new element, and the previous element can be found using SoElement::getNextInStack().

Reimplemented from SoElement.

Reimplemented in SoGLLazyElement.

  SbBool SoLazyElement::matches (const SoElement *) const [virtual]
Will always return TRUE in Coin.

Implements SoElement.

  SoElement * SoLazyElement::copyMatchInfo (void) const [virtual]
Just returns NULL in Coin.

Implements SoElement.

  void SoLazyElement::setToDefault (SoState * state) [static]
Internal function used for resetting the OpenGL state before FBO rendering.

Author

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