Add support for blend functions and alpha test functions in effects
This commit is contained in:
Tim Moore
parent
6db9138eeb
commit
23d0601d82
@ -36,9 +36,12 @@
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#include <boost/tuple/tuple.hpp>
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#include <boost/tuple/tuple_comparison.hpp>
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#include <osg/AlphaFunc>
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#include <osg/BlendFunc>
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#include <osg/CullFace>
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#include <osg/Drawable>
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#include <osg/Material>
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#include <osg/Math>
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#include <osg/PolygonMode>
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#include <osg/Program>
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#include <osg/Referenced>
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@ -240,8 +243,10 @@ struct CullFaceBuilder : PassAttributeBuilder
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const osgDB::ReaderWriter::Options* options)
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{
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const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
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if (!realProp)
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if (!realProp) {
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pass->setMode(GL_CULL_FACE, StateAttribute::OFF);
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return;
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}
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StateAttributeFactory *attrFact = StateAttributeFactory::instance();
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string propVal = realProp->getStringValue();
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if (propVal == "front")
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@ -250,6 +255,8 @@ struct CullFaceBuilder : PassAttributeBuilder
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pass->setAttributeAndModes(attrFact->getCullFaceBack());
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else if (propVal == "front-back")
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pass->setAttributeAndModes(new CullFace(CullFace::FRONT_AND_BACK));
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else if (propVal == "off")
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pass->setMode(GL_CULL_FACE, StateAttribute::OFF);
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else
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SG_LOG(SG_INPUT, SG_ALERT,
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"invalid cull face property " << propVal);
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@ -365,33 +372,166 @@ void MaterialBuilder::buildAttribute(Effect* effect, Pass* pass,
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InstallAttributeBuilder<MaterialBuilder> installMaterial("material");
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EffectNameValue<BlendFunc::BlendFuncMode> blendFuncModesInit[] =
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{
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{"dst-alpha", BlendFunc::DST_ALPHA},
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{"dst-color", BlendFunc::DST_COLOR},
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{"one", BlendFunc::ONE},
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{"one-minus-dst-alpha", BlendFunc::ONE_MINUS_DST_ALPHA},
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{"one-minus-dst-color", BlendFunc::ONE_MINUS_DST_COLOR},
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{"one-minus-src-alpha", BlendFunc::ONE_MINUS_SRC_ALPHA},
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{"one-minus-src-color", BlendFunc::ONE_MINUS_SRC_COLOR},
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{"src-alpha", BlendFunc::SRC_ALPHA},
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{"src-alpha-saturate", BlendFunc::SRC_ALPHA_SATURATE},
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{"src-color", BlendFunc::SRC_COLOR},
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{"constant-color", BlendFunc::CONSTANT_COLOR},
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{"one-minus-constant-color", BlendFunc::ONE_MINUS_CONSTANT_COLOR},
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{"constant-alpha", BlendFunc::CONSTANT_ALPHA},
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{"one-minus-constant-alpha", BlendFunc::ONE_MINUS_CONSTANT_ALPHA},
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{"zero", BlendFunc::ZERO}
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};
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EffectPropertyMap<BlendFunc::BlendFuncMode> blendFuncModes(blendFuncModesInit);
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struct BlendBuilder : public PassAttributeBuilder
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{
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void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
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const osgDB::ReaderWriter::Options* options)
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{
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// XXX Compatibility with early <blend> syntax; should go away
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// before a release
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const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
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if (!realProp)
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return;
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if (realProp->nChildren() == 0) {
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pass->setMode(GL_BLEND, (realProp->getBoolValue()
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? StateAttribute::ON
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: StateAttribute::OFF));
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return;
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}
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const SGPropertyNode* pmode = getEffectPropertyChild(effect, prop,
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"mode");
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// XXX When dynamic parameters are supported, this code should
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// create the blend function even if the mode is off.
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if (pmode && !pmode->getValue<bool>()) {
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pass->setMode(GL_BLEND, StateAttribute::OFF);
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return;
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}
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const SGPropertyNode* psource = getEffectPropertyChild(effect, prop,
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"source");
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const SGPropertyNode* pdestination
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= getEffectPropertyChild(effect, prop, "destination");
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const SGPropertyNode* psourceRGB
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= getEffectPropertyChild(effect, prop, "source-rgb");
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const SGPropertyNode* psourceAlpha
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= getEffectPropertyChild(effect, prop, "source-alpha");
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const SGPropertyNode* pdestRGB
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= getEffectPropertyChild(effect, prop, "destination-rgb");
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const SGPropertyNode* pdestAlpha
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= getEffectPropertyChild(effect, prop, "destination-alpha");
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BlendFunc::BlendFuncMode sourceMode = BlendFunc::ONE;
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BlendFunc::BlendFuncMode destMode = BlendFunc::ZERO;
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if (psource)
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findAttr(blendFuncModes, psource, sourceMode);
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if (pdestination)
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findAttr(blendFuncModes, pdestination, destMode);
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if (psource && pdestination
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&& !(psourceRGB || psourceAlpha || pdestRGB || pdestAlpha)
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&& sourceMode == BlendFunc::SRC_ALPHA
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&& destMode == BlendFunc::ONE_MINUS_SRC_ALPHA) {
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pass->setAttributeAndModes(StateAttributeFactory::instance()
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->getStandardBlendFunc());
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return;
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}
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BlendFunc* blendFunc = new BlendFunc;
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if (psource)
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blendFunc->setSource(sourceMode);
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if (pdestination)
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blendFunc->setDestination(destMode);
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if (psourceRGB) {
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BlendFunc::BlendFuncMode sourceRGBMode;
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findAttr(blendFuncModes, psourceRGB, sourceRGBMode);
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blendFunc->setSourceRGB(sourceRGBMode);
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}
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if (pdestRGB) {
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BlendFunc::BlendFuncMode destRGBMode;
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findAttr(blendFuncModes, pdestRGB, destRGBMode);
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blendFunc->setDestinationRGB(destRGBMode);
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}
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if (psourceAlpha) {
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BlendFunc::BlendFuncMode sourceAlphaMode;
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findAttr(blendFuncModes, psourceAlpha, sourceAlphaMode);
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blendFunc->setSourceAlpha(sourceAlphaMode);
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}
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if (pdestAlpha) {
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BlendFunc::BlendFuncMode destAlphaMode;
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findAttr(blendFuncModes, pdestAlpha, destAlphaMode);
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blendFunc->setDestinationAlpha(destAlphaMode);
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}
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pass->setAttributeAndModes(blendFunc);
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}
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};
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InstallAttributeBuilder<BlendBuilder> installBlend("blend");
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EffectNameValue<AlphaFunc::ComparisonFunction> alphaComparisonInit[] =
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{
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{"never", AlphaFunc::NEVER},
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{"less", AlphaFunc::LESS},
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{"equal", AlphaFunc::EQUAL},
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{"lequal", AlphaFunc::LEQUAL},
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{"greater", AlphaFunc::GREATER},
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{"notequal", AlphaFunc::NOTEQUAL},
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{"gequal", AlphaFunc::GEQUAL},
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{"always", AlphaFunc::ALWAYS}
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};
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EffectPropertyMap<AlphaFunc::ComparisonFunction>
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alphaComparison(alphaComparisonInit);
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struct AlphaTestBuilder : public PassAttributeBuilder
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{
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void buildAttribute(Effect* effect, Pass* pass, const SGPropertyNode* prop,
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const osgDB::ReaderWriter::Options* options)
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{
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// XXX Compatibility with early <alpha-test> syntax; should go away
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// before a release
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const SGPropertyNode* realProp = getEffectPropertyNode(effect, prop);
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if (!realProp)
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return;
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if (realProp->nChildren() == 0) {
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pass->setMode(GL_ALPHA_TEST, (realProp->getBoolValue()
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? StateAttribute::ON
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: StateAttribute::OFF));
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return;
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}
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const SGPropertyNode* pmode = getEffectPropertyChild(effect, prop,
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"mode");
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// XXX When dynamic parameters are supported, this code should
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// create the blend function even if the mode is off.
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if (pmode && !pmode->getValue<bool>()) {
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pass->setMode(GL_ALPHA_TEST, StateAttribute::OFF);
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return;
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}
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const SGPropertyNode* pComp = getEffectPropertyChild(effect, prop,
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"comparison");
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const SGPropertyNode* pRef = getEffectPropertyChild(effect, prop,
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"reference");
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AlphaFunc::ComparisonFunction func = AlphaFunc::ALWAYS;
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float refValue = 1.0f;
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if (pComp)
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findAttr(alphaComparison, pComp, func);
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if (pRef)
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refValue = pRef->getValue<float>();
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if (func == AlphaFunc::GREATER && osg::equivalent(refValue, 1.0f)) {
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pass->setAttributeAndModes(StateAttributeFactory::instance()
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->getStandardAlphaFunc());
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} else {
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AlphaFunc* alphaFunc = new AlphaFunc;
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alphaFunc->setFunction(func);
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alphaFunc->setReferenceValue(refValue);
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pass->setAttributeAndModes(alphaFunc);
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}
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}
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};
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@ -735,6 +875,61 @@ void buildTechnique(Effect* effect, const SGPropertyNode* prop,
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}
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}
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// Specifically for .ac files...
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bool makeParametersFromStateSet(SGPropertyNode* paramRoot, const StateSet* ss)
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{
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SGPropertyNode* matNode = paramRoot->getChild("material", 0, true);
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Vec4f ambVal, difVal, specVal, emisVal;
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float shininess = 0.0f;
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const Material* mat
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= static_cast<const Material*>(ss->getAttribute(StateAttribute
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::MATERIAL));
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if (mat) {
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ambVal = mat->getAmbient(Material::FRONT_AND_BACK);
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difVal = mat->getDiffuse(Material::FRONT_AND_BACK);
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specVal = mat->getSpecular(Material::FRONT_AND_BACK);
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emisVal = mat->getEmission(Material::FRONT_AND_BACK);
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shininess = mat->getShininess(Material::FRONT_AND_BACK);
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}
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matNode->getChild("ambient", 0, true)->setValue(toVec4d(toSG(ambVal)));
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matNode->getChild("diffuse", 0, true)->setValue(toVec4d(toSG(difVal)));
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matNode->getChild("specular", 0, true)->setValue(toVec4d(toSG(specVal)));
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matNode->getChild("emissive", 0, true)->setValue(toVec4d(toSG(emisVal)));
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matNode->getChild("shininess", 0, true)->setValue(shininess);
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matNode->getChild("color-mode", 0, true)->setStringValue("diffuse");
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const ShadeModel* sm
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= static_cast<const ShadeModel*>(ss->getAttribute(StateAttribute
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::SHADEMODEL));
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string shadeModelString("smooth");
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if (sm) {
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ShadeModel::Mode smMode = sm->getMode();
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if (smMode == ShadeModel::FLAT)
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shadeModelString = "flat";
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}
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paramRoot->getChild("shade-model", 0, true)
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->setStringValue(shadeModelString);
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string cullFaceString("off");
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const CullFace* cullFace
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= static_cast<const CullFace*>(ss->getAttribute(StateAttribute
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::CULLFACE));
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if (cullFace) {
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switch (cullFace->getMode()) {
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case CullFace::FRONT:
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cullFaceString = "front";
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break;
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case CullFace::BACK:
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cullFaceString = "back";
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break;
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case CullFace::FRONT_AND_BACK:
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cullFaceString = "front-back";
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break;
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default:
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break;
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}
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}
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paramRoot->getChild("cull-face", 0, true)->setStringValue(cullFaceString);
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}
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// Walk the techniques property tree, building techniques and
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// passes.
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bool Effect::realizeTechniques(const osgDB::ReaderWriter::Options* options)
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