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Merge branch 'even-fixier-alpha' into 'master'

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Correctly track added and removed state to fix various alpha testing issues

Closes #6119

See merge request OpenMW/openmw!989

(cherry picked from commit 94be4eba18d328391a2c2aea85bb029e80b32cee)

0e57622b Correctly track added and removed state
e42b3bf9 Adapt destination alpha factor for AMD
84a9face Disable coverage adjustment for blended objects
This commit is contained in:
psi29a 2021-07-05 08:15:17 +00:00
parent dfacaa3711
commit d6a2838c8b
4 changed files with 169 additions and 21 deletions
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5
components/nifosg/nifloader.cpp
View file

@ -2011,6 +2011,11 @@ namespace NifOsg
{
osg::ref_ptr<osg::BlendFunc> blendFunc (new osg::BlendFunc(getBlendMode((alphaprop->flags>>1)&0xf),
getBlendMode((alphaprop->flags>>5)&0xf)));
// on AMD hardware, alpha still seems to be stored with an RGBA framebuffer with OpenGL.
// This might be mandated by the OpenGL 2.1 specification section 2.14.9, or might be a bug.
// Either way, D3D8.1 doesn't do that, so adapt the destination factor.
if (blendFunc->getDestination() == GL_DST_ALPHA)
blendFunc->setDestination(GL_ONE);
blendFunc = shareAttribute(blendFunc);
stateset->setAttributeAndModes(blendFunc, osg::StateAttribute::ON);

1
components/sceneutil/mwshadowtechnique.cpp
View file

@ -904,6 +904,7 @@ void SceneUtil::MWShadowTechnique::setupCastingShader(Shader::ShaderManager & sh
program->addShader(castingVertexShader);
program->addShader(shaderManager.getShader("shadowcasting_fragment.glsl", { {"alphaFunc", std::to_string(alphaFunc)},
{"alphaToCoverage", "0"},
{"adjustCoverage", "1"},
{"useGPUShader4", useGPUShader4}
}, osg::Shader::FRAGMENT));
}

182
components/shader/shadervisitor.cpp
View file

@ -22,6 +22,68 @@
namespace Shader
{
class AddedState : public osg::Object
{
public:
AddedState() = default;
AddedState(const AddedState& rhs, const osg::CopyOp& copyOp)
: osg::Object(rhs, copyOp)
, mUniforms(rhs.mUniforms)
, mModes(rhs.mModes)
, mAttributes(rhs.mAttributes)
{
}
void addUniform(const std::string& name) { mUniforms.emplace(name); }
void setMode(osg::StateAttribute::GLMode mode) { mModes.emplace(mode); }
void setAttribute(osg::StateAttribute::TypeMemberPair typeMemberPair) { mAttributes.emplace(typeMemberPair); }
void setAttribute(const osg::StateAttribute* attribute)
{
mAttributes.emplace(attribute->getTypeMemberPair());
}
template<typename T>
void setAttribute(osg::ref_ptr<T> attribute) { setAttribute(attribute.get()); }
void setAttributeAndModes(const osg::StateAttribute* attribute)
{
setAttribute(attribute);
InterrogateModesHelper helper(this);
attribute->getModeUsage(helper);
}
template<typename T>
void setAttributeAndModes(osg::ref_ptr<T> attribute) { setAttributeAndModes(attribute.get()); }
bool hasUniform(const std::string& name) { return mUniforms.count(name); }
bool hasMode(osg::StateAttribute::GLMode mode) { return mModes.count(mode); }
bool hasAttribute(osg::StateAttribute::TypeMemberPair typeMemberPair) { return mAttributes.count(typeMemberPair); }
bool hasAttribute(osg::StateAttribute::Type type, unsigned int member) { return hasAttribute(osg::StateAttribute::TypeMemberPair(type, member)); }
const std::set<osg::StateAttribute::TypeMemberPair>& getAttributes() { return mAttributes; }
bool empty()
{
return mUniforms.empty() && mModes.empty() && mAttributes.empty();
}
META_Object(Shader, AddedState)
private:
class InterrogateModesHelper : public osg::StateAttribute::ModeUsage
{
public:
InterrogateModesHelper(AddedState* tracker) : mTracker(tracker) {}
void usesMode(osg::StateAttribute::GLMode mode) override { mTracker->setMode(mode); }
void usesTextureMode(osg::StateAttribute::GLMode mode) override {}
private:
AddedState* mTracker;
};
std::unordered_set<std::string> mUniforms;
std::unordered_set<osg::StateAttribute::GLMode> mModes;
std::set<osg::StateAttribute::TypeMemberPair> mAttributes;
};
ShaderVisitor::ShaderRequirements::ShaderRequirements()
: mShaderRequired(false)
@ -105,14 +167,32 @@ namespace Shader
return static_cast<osg::StateSet *>(stateSet.getUserDataContainer()->getUserObject("removedState"));
}
void updateRemovedState(osg::UserDataContainer& userData, osg::StateSet* stateSet)
void updateRemovedState(osg::UserDataContainer& userData, osg::StateSet* removedState)
{
unsigned int index = userData.getUserObjectIndex("removedState");
if (index < userData.getNumUserObjects())
userData.setUserObject(index, stateSet);
userData.setUserObject(index, removedState);
else
userData.addUserObject(stateSet);
stateSet->setName("removedState");
userData.addUserObject(removedState);
removedState->setName("removedState");
}
AddedState* getAddedState(osg::StateSet& stateSet)
{
if (!stateSet.getUserDataContainer())
return nullptr;
return static_cast<AddedState*>(stateSet.getUserDataContainer()->getUserObject("addedState"));
}
void updateAddedState(osg::UserDataContainer& userData, AddedState* addedState)
{
unsigned int index = userData.getUserObjectIndex("addedState");
if (index < userData.getNumUserObjects())
userData.setUserObject(index, addedState);
else
userData.addUserObject(addedState);
addedState->setName("addedState");
}
const char* defaultTextures[] = { "diffuseMap", "normalMap", "emissiveMap", "darkMap", "detailMap", "envMap", "specularMap", "decalMap", "bumpMap" };
@ -280,11 +360,13 @@ namespace Shader
osg::StateSet::AttributeList removedAttributes;
if (osg::ref_ptr<osg::StateSet> removedState = getRemovedState(*stateset))
removedAttributes = removedState->getAttributeList();
osg::ref_ptr<AddedState> addedState = getAddedState(*stateset);
for (const auto* attributeMap : std::initializer_list<const osg::StateSet::AttributeList*>{ &attributes, &removedAttributes })
{
for (osg::StateSet::AttributeList::const_iterator it = attributeMap->begin(); it != attributeMap->end(); ++it)
{
if (attributeMap != &removedAttributes && removedAttributes.count(it->first))
if (addedState && attributeMap != &removedAttributes && addedState->hasAttribute(it->first))
continue;
if (it->first.first == osg::StateAttribute::MATERIAL)
{
@ -296,9 +378,6 @@ namespace Shader
const osg::Material* mat = static_cast<const osg::Material*>(it->second.first.get());
if (!writableStateSet)
writableStateSet = getWritableStateSet(node);
int colorMode;
switch (mat->getColorMode())
{
@ -376,6 +455,10 @@ namespace Shader
writableStateSet = node.getOrCreateStateSet();
else
writableStateSet = getWritableStateSet(node);
osg::ref_ptr<AddedState> addedState = new AddedState;
osg::ref_ptr<AddedState> previousAddedState = getAddedState(*writableStateSet);
if (!previousAddedState)
previousAddedState = new AddedState;
ShaderManager::DefineMap defineMap;
for (unsigned int i=0; i<sizeof(defaultTextures)/sizeof(defaultTextures[0]); ++i)
@ -392,6 +475,7 @@ namespace Shader
defineMap["parallax"] = reqs.mNormalHeight ? "1" : "0";
writableStateSet->addUniform(new osg::Uniform("colorMode", reqs.mColorMode));
addedState->addUniform("colorMode");
defineMap["alphaFunc"] = std::to_string(reqs.mAlphaFunc);
@ -403,26 +487,35 @@ namespace Shader
removedState = new osg::StateSet();
defineMap["alphaToCoverage"] = "0";
defineMap["adjustCoverage"] = "0";
if (reqs.mAlphaFunc != osg::AlphaFunc::ALWAYS)
{
writableStateSet->addUniform(new osg::Uniform("alphaRef", reqs.mAlphaRef));
addedState->addUniform("alphaRef");
if (!removedState->getAttributePair(osg::StateAttribute::ALPHAFUNC))
{
const auto* alphaFunc = writableStateSet->getAttributePair(osg::StateAttribute::ALPHAFUNC);
if (alphaFunc)
if (alphaFunc && !previousAddedState->hasAttribute(osg::StateAttribute::ALPHAFUNC, 0))
removedState->setAttribute(alphaFunc->first, alphaFunc->second);
}
// This prevents redundant glAlphaFunc calls while letting the shadows bin still see the test
writableStateSet->setAttribute(RemovedAlphaFunc::getInstance(reqs.mAlphaFunc), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
addedState->setAttribute(RemovedAlphaFunc::getInstance(reqs.mAlphaFunc));
// Blending won't work with A2C as we use the alpha channel for coverage. gl_SampleCoverage from ARB_sample_shading would save the day, but requires GLSL 130
if (mConvertAlphaTestToAlphaToCoverage && !reqs.mAlphaBlend)
{
writableStateSet->setMode(GL_SAMPLE_ALPHA_TO_COVERAGE_ARB, osg::StateAttribute::ON);
addedState->setMode(GL_SAMPLE_ALPHA_TO_COVERAGE_ARB);
defineMap["alphaToCoverage"] = "1";
}
// Adjusting coverage isn't safe with blending on as blending requires the alpha to be intact.
// Maybe we could also somehow (e.g. userdata) detect when the diffuse map has coverage-preserving mip maps in the future
if (!reqs.mAlphaBlend)
defineMap["adjustCoverage"] = "1";
// Preventing alpha tested stuff shrinking as lower mip levels are used requires knowing the texture size
osg::ref_ptr<osg::GLExtensions> exts = osg::GLExtensions::Get(0, false);
if (exts && exts->isGpuShader4Supported)
@ -430,10 +523,11 @@ namespace Shader
// We could fall back to a texture size uniform if EXT_gpu_shader4 is missing
}
if (writableStateSet->getMode(GL_ALPHA_TEST) != osg::StateAttribute::INHERIT)
if (writableStateSet->getMode(GL_ALPHA_TEST) != osg::StateAttribute::INHERIT && !previousAddedState->hasMode(GL_ALPHA_TEST))
removedState->setMode(GL_ALPHA_TEST, writableStateSet->getMode(GL_ALPHA_TEST));
// This disables the deprecated fixed-function alpha test
writableStateSet->setMode(GL_ALPHA_TEST, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
addedState->setMode(GL_ALPHA_TEST);
if (!removedState->getModeList().empty() || !removedState->getAttributeList().empty())
{
@ -447,6 +541,18 @@ namespace Shader
updateRemovedState(*writableUserData, removedState);
}
if (!addedState->empty())
{
// user data is normally shallow copied so shared with the original stateset
osg::ref_ptr<osg::UserDataContainer> writableUserData;
if (mAllowedToModifyStateSets)
writableUserData = writableStateSet->getOrCreateUserDataContainer();
else
writableUserData = getWritableUserDataContainer(*writableStateSet);
updateAddedState(*writableUserData, addedState);
}
defineMap["translucentFramebuffer"] = mTranslucentFramebuffer ? "1" : "0";
std::string shaderPrefix;
@ -458,11 +564,14 @@ namespace Shader
if (vertexShader && fragmentShader)
{
writableStateSet->setAttributeAndModes(mShaderManager.getProgram(vertexShader, fragmentShader), osg::StateAttribute::ON);
auto program = mShaderManager.getProgram(vertexShader, fragmentShader);
writableStateSet->setAttributeAndModes(program, osg::StateAttribute::ON);
addedState->setAttributeAndModes(program);
for (std::map<int, std::string>::const_iterator texIt = reqs.mTextures.begin(); texIt != reqs.mTextures.end(); ++texIt)
{
writableStateSet->addUniform(new osg::Uniform(texIt->second.c_str(), texIt->first), osg::StateAttribute::ON);
addedState->addUniform(texIt->second);
}
}
}
@ -477,24 +586,57 @@ namespace Shader
else
writableStateSet = getWritableStateSet(node);
writableStateSet->removeAttribute(osg::StateAttribute::PROGRAM);
// user data is normally shallow copied so shared with the original stateset - we'll need to copy before edits
osg::ref_ptr<osg::UserDataContainer> writableUserData;
if (osg::ref_ptr<osg::StateSet> removedState = getRemovedState(*writableStateSet))
if (osg::ref_ptr<AddedState> addedState = getAddedState(*writableStateSet))
{
// user data is normally shallow copied so shared with the original stateset
osg::ref_ptr<osg::UserDataContainer> writableUserData;
if (mAllowedToModifyStateSets)
writableUserData = writableStateSet->getUserDataContainer();
else
writableUserData = getWritableUserDataContainer(*writableStateSet);
unsigned int index = writableUserData->getUserObjectIndex("addedState");
writableUserData->removeUserObject(index);
// O(n log n) to use StateSet::removeX, but this is O(n)
for (auto itr = writableStateSet->getUniformList().begin(); itr != writableStateSet->getUniformList().end();)
{
if (addedState->hasUniform(itr->first))
writableStateSet->getUniformList().erase(itr);
else
++itr;
}
for (auto itr = writableStateSet->getModeList().begin(); itr != writableStateSet->getModeList().end();)
{
if (addedState->hasMode(itr->first))
writableStateSet->getModeList().erase(itr);
else
++itr;
}
// StateAttributes track the StateSets they're attached to
// We don't have access to the function to do that, and can't call removeAttribute with an iterator
for (const auto& [type, member] : addedState->getAttributes())
writableStateSet->removeAttribute(type, member);
}
if (osg::ref_ptr<osg::StateSet> removedState = getRemovedState(*writableStateSet))
{
if (!writableUserData)
{
if (mAllowedToModifyStateSets)
writableUserData = writableStateSet->getUserDataContainer();
else
writableUserData = getWritableUserDataContainer(*writableStateSet);
}
unsigned int index = writableUserData->getUserObjectIndex("removedState");
writableUserData->removeUserObject(index);
for (const auto& [mode, value] : removedState->getModeList())
writableStateSet->setMode(mode, value);
for (const auto& attribute : removedState->getAttributeList())
writableStateSet->setAttribute(attribute.second.first, attribute.second.second);
writableStateSet->merge(*removedState);
}
}

2
files/shaders/alpha.glsl
View file

@ -22,7 +22,7 @@ float mipmapLevel(vec2 scaleduv)
float coveragePreservingAlphaScale(sampler2D diffuseMap, vec2 uv)
{
#if @alphaFunc != FUNC_ALWAYS && @alphaFunc != FUNC_NEVER
#if @adjustCoverage
vec2 textureSize;
#if @useGPUShader4
textureSize = textureSize2D(diffuseMap, 0);