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technique.cpp
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technique.cpp
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#include "technique.hpp"
#include <array>
#include <string>
#include <utility>
#include <osg/Texture1D>
#include <osg/Texture2D>
#include <osg/Texture3D>
#include <SDL_opengl_glext.h>
#include <components/debug/debuglog.hpp>
#include <components/files/conversion.hpp>
#include <components/misc/strings/algorithm.hpp>
#include <components/resource/imagemanager.hpp>
#include <components/stereo/multiview.hpp>
#include <components/vfs/manager.hpp>
#include "parse_constants.hpp"
namespace
{
struct ProxyTextureData
{
osg::Texture::WrapMode wrap_s = osg::Texture::CLAMP_TO_EDGE;
osg::Texture::WrapMode wrap_t = osg::Texture::CLAMP_TO_EDGE;
osg::Texture::WrapMode wrap_r = osg::Texture::CLAMP_TO_EDGE;
osg::Texture::FilterMode min_filter = osg::Texture::LINEAR_MIPMAP_LINEAR;
osg::Texture::FilterMode mag_filter = osg::Texture::LINEAR;
osg::Texture::InternalFormatMode compression = osg::Texture::USE_IMAGE_DATA_FORMAT;
std::optional<int> source_format;
std::optional<int> source_type;
std::optional<int> internal_format;
};
}
namespace fx
{
namespace
{
VFS::Path::Normalized makeFilePath(std::string_view name)
{
std::string fileName(name);
fileName += Technique::sExt;
VFS::Path::Normalized result(Technique::sSubdir);
result /= fileName;
return result;
}
}
Technique::Technique(const VFS::Manager& vfs, Resource::ImageManager& imageManager, std::string name, int width,
int height, bool ubo, bool supportsNormals)
: mName(std::move(name))
, mFilePath(makeFilePath(mName))
, mLastModificationTime(std::filesystem::file_time_type::clock::now())
, mWidth(width)
, mHeight(height)
, mVFS(vfs)
, mImageManager(imageManager)
, mUBO(ubo)
, mSupportsNormals(supportsNormals)
{
clear();
}
void Technique::clear()
{
mTextures.clear();
mStatus = Status::Uncompiled;
mValid = false;
mHDR = false;
mNormals = false;
mLights = false;
mEnabled = true;
mPassMap.clear();
mPasses.clear();
mPassKeys.clear();
mDefinedUniforms.clear();
mRenderTargets.clear();
mLastAppliedType = Pass::Type::None;
mFlags = 0;
mShared.clear();
mAuthor = {};
mDescription = {};
mVersion = {};
mGLSLExtensions.clear();
mGLSLVersion = mUBO ? 330 : 120;
mGLSLProfile.clear();
mDynamic = false;
}
std::string Technique::getBlockWithLineDirective()
{
auto block = mLexer->getLastJumpBlock();
std::string content = std::string(block.content);
content = "\n#line " + std::to_string(block.line + 1) + "\n" + std::string(block.content) + "\n";
return content;
}
Technique::UniformMap::iterator Technique::findUniform(const std::string& name)
{
return std::find_if(mDefinedUniforms.begin(), mDefinedUniforms.end(),
[&name](const auto& uniform) { return uniform->mName == name; });
}
bool Technique::compile()
{
clear();
if (!mVFS.exists(mFilePath))
{
Log(Debug::Error) << "Could not load technique, file does not exist '" << mFilePath << "'";
mStatus = Status::File_Not_exists;
return false;
}
try
{
std::string source(std::istreambuf_iterator<char>(*mVFS.get(getFileName())), {});
parse(std::move(source));
if (mPassKeys.empty())
error("no pass list found, ensure you define one in a 'technique' block");
int swaps = 0;
for (auto& name : mPassKeys)
{
auto it = mPassMap.find(name);
if (it == mPassMap.end())
error(
Misc::StringUtils::format("pass '%s' was found in the pass list, but there was no matching "
"'fragment', 'vertex' or 'compute' block",
std::string(name)));
if (mLastAppliedType != Pass::Type::None && mLastAppliedType != it->second->mType)
{
swaps++;
if (swaps == 2)
Log(Debug::Warning) << "compute and pixel shaders are being swapped multiple times in shader "
"chain, this can lead to serious performance drain.";
}
else
mLastAppliedType = it->second->mType;
if (Stereo::getMultiview())
{
mGLSLExtensions.insert("GL_OVR_multiview");
mGLSLExtensions.insert("GL_OVR_multiview2");
mGLSLExtensions.insert("GL_EXT_texture_array");
}
it->second->compile(*this, mShared);
if (!it->second->mTarget.empty())
{
auto rtIt = mRenderTargets.find(it->second->mTarget);
if (rtIt == mRenderTargets.end())
error(Misc::StringUtils::format("target '%s' not defined", std::string(it->second->mTarget)));
}
mPasses.emplace_back(it->second);
}
if (mPasses.empty())
error("invalid pass list, no passes defined for technique");
mValid = true;
}
catch (const std::runtime_error& e)
{
clear();
mStatus = Status::Parse_Error;
mLastError = "Failed parsing technique '" + getName() + "' " + e.what();
Log(Debug::Error) << mLastError;
}
return mValid;
}
std::string Technique::getName() const
{
return mName;
}
bool Technique::setLastModificationTime(std::filesystem::file_time_type timeStamp)
{
const bool isDirty = timeStamp != mLastModificationTime;
mLastModificationTime = timeStamp;
return isDirty;
}
[[noreturn]] void Technique::error(const std::string& msg)
{
mLexer->error(msg);
}
template <>
void Technique::parseBlockImp<Lexer::Shared>()
{
if (!mLexer->jump())
error(Misc::StringUtils::format("unterminated 'shared' block, expected closing brackets"));
if (!mShared.empty())
error("repeated 'shared' block, only one allowed per technique file");
mShared = getBlockWithLineDirective();
}
template <>
void Technique::parseBlockImp<Lexer::Technique>()
{
if (!mPassKeys.empty())
error("exactly one 'technique' block can appear per file");
while (!isNext<Lexer::Close_bracket>() && !isNext<Lexer::Eof>())
{
expect<Lexer::Literal>();
auto key = std::get<Lexer::Literal>(mToken).value;
expect<Lexer::Equal>();
if (key == "passes")
mPassKeys = parseLiteralList<Lexer::Comma>();
else if (key == "version")
mVersion = parseString();
else if (key == "description")
mDescription = parseString();
else if (key == "author")
mAuthor = parseString();
else if (key == "glsl_version")
{
int version = parseInteger();
if (mUBO && version > 330)
mGLSLVersion = version;
}
else if (key == "flags")
mFlags = parseFlags();
else if (key == "hdr")
mHDR = parseBool();
else if (key == "pass_normals")
mNormals = parseBool() && mSupportsNormals;
else if (key == "pass_lights")
mLights = parseBool();
else if (key == "glsl_profile")
{
expect<Lexer::String>();
mGLSLProfile = std::string(std::get<Lexer::String>(mToken).value);
}
else if (key == "glsl_extensions")
{
for (const auto& ext : parseLiteralList<Lexer::Comma>())
mGLSLExtensions.emplace(ext);
}
else if (key == "dynamic")
mDynamic = parseBool();
else
error(Misc::StringUtils::format("unexpected key '%s'", std::string{ key }));
expect<Lexer::SemiColon>();
}
if (mPassKeys.empty())
error("pass list in 'technique' block cannot be empty.");
}
template <>
void Technique::parseBlockImp<Lexer::Render_Target>()
{
if (mRenderTargets.count(mBlockName))
error(Misc::StringUtils::format("redeclaration of render target '%s'", std::string(mBlockName)));
fx::Types::RenderTarget rt;
rt.mTarget->setTextureSize(mWidth, mHeight);
rt.mTarget->setSourceFormat(GL_RGB);
rt.mTarget->setInternalFormat(GL_RGB);
rt.mTarget->setSourceType(GL_UNSIGNED_BYTE);
rt.mTarget->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
rt.mTarget->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
rt.mTarget->setName(std::string(mBlockName));
while (!isNext<Lexer::Close_bracket>() && !isNext<Lexer::Eof>())
{
expect<Lexer::Literal>();
auto key = std::get<Lexer::Literal>(mToken).value;
expect<Lexer::Equal>();
if (key == "min_filter")
rt.mTarget->setFilter(osg::Texture2D::MIN_FILTER, parseFilterMode());
else if (key == "mag_filter")
rt.mTarget->setFilter(osg::Texture2D::MAG_FILTER, parseFilterMode());
else if (key == "wrap_s")
rt.mTarget->setWrap(osg::Texture2D::WRAP_S, parseWrapMode());
else if (key == "wrap_t")
rt.mTarget->setWrap(osg::Texture2D::WRAP_T, parseWrapMode());
else if (key == "width_ratio")
rt.mSize.mWidthRatio = parseFloat();
else if (key == "height_ratio")
rt.mSize.mHeightRatio = parseFloat();
else if (key == "width")
rt.mSize.mWidth = parseInteger();
else if (key == "height")
rt.mSize.mHeight = parseInteger();
else if (key == "internal_format")
rt.mTarget->setInternalFormat(parseInternalFormat());
else if (key == "source_type")
rt.mTarget->setSourceType(parseSourceType());
else if (key == "source_format")
rt.mTarget->setSourceFormat(parseSourceFormat());
else if (key == "mipmaps")
rt.mMipMap = parseBool();
else if (key == "clear_color")
rt.mClearColor = parseVec<osg::Vec4f, Lexer::Vec4>();
else
error(Misc::StringUtils::format("unexpected key '%s'", std::string(key)));
expect<Lexer::SemiColon>();
}
mRenderTargets.emplace(mBlockName, std::move(rt));
}
template <>
void Technique::parseBlockImp<Lexer::Vertex>()
{
if (!mLexer->jump())
error(Misc::StringUtils::format("unterminated 'vertex' block, expected closing brackets"));
auto& pass = mPassMap[mBlockName];
if (!pass)
pass = std::make_shared<fx::Pass>();
pass->mName = mBlockName;
if (pass->mCompute)
error(Misc::StringUtils::format("'compute' block already defined. Usage is ambiguous."));
else if (!pass->mVertex)
pass->mVertex = new osg::Shader(osg::Shader::VERTEX, getBlockWithLineDirective());
else
error(Misc::StringUtils::format("duplicate vertex shader for block '%s'", std::string(mBlockName)));
pass->mType = Pass::Type::Pixel;
}
template <>
void Technique::parseBlockImp<Lexer::Fragment>()
{
if (!mLexer->jump())
error(Misc::StringUtils::format("unterminated 'fragment' block, expected closing brackets"));
auto& pass = mPassMap[mBlockName];
if (!pass)
pass = std::make_shared<fx::Pass>();
pass->mUBO = mUBO;
pass->mName = mBlockName;
if (pass->mCompute)
error(Misc::StringUtils::format("'compute' block already defined. Usage is ambiguous."));
else if (!pass->mFragment)
pass->mFragment = new osg::Shader(osg::Shader::FRAGMENT, getBlockWithLineDirective());
else
error(Misc::StringUtils::format("duplicate vertex shader for block '%s'", std::string(mBlockName)));
pass->mType = Pass::Type::Pixel;
}
template <>
void Technique::parseBlockImp<Lexer::Compute>()
{
if (!mLexer->jump())
error(Misc::StringUtils::format("unterminated 'compute' block, expected closing brackets"));
auto& pass = mPassMap[mBlockName];
if (!pass)
pass = std::make_shared<fx::Pass>();
pass->mName = mBlockName;
if (pass->mFragment)
error(Misc::StringUtils::format("'fragment' block already defined. Usage is ambiguous."));
else if (pass->mVertex)
error(Misc::StringUtils::format("'vertex' block already defined. Usage is ambiguous."));
else if (!pass->mFragment)
pass->mCompute = new osg::Shader(osg::Shader::COMPUTE, getBlockWithLineDirective());
else
error(Misc::StringUtils::format("duplicate vertex shader for block '%s'", std::string(mBlockName)));
pass->mType = Pass::Type::Compute;
}
template <class T>
void Technique::parseSampler()
{
if (findUniform(std::string(mBlockName)) != mDefinedUniforms.end())
error(Misc::StringUtils::format("redeclaration of uniform '%s'", std::string(mBlockName)));
ProxyTextureData proxy;
osg::ref_ptr<osg::Texture> sampler;
constexpr bool is1D = std::is_same_v<Lexer::Sampler_1D, T>;
constexpr bool is3D = std::is_same_v<Lexer::Sampler_3D, T>;
Types::SamplerType type;
while (!isNext<Lexer::Close_bracket>() && !isNext<Lexer::Eof>())
{
expect<Lexer::Literal>();
auto key = asLiteral();
expect<Lexer::Equal>();
if (!is1D && key == "min_filter")
proxy.min_filter = parseFilterMode();
else if (!is1D && key == "mag_filter")
proxy.mag_filter = parseFilterMode();
else if (key == "wrap_s")
proxy.wrap_s = parseWrapMode();
else if (key == "wrap_t")
proxy.wrap_t = parseWrapMode();
else if (is3D && key == "wrap_r")
proxy.wrap_r = parseWrapMode();
else if (key == "compression")
proxy.compression = parseCompression();
else if (key == "source_type")
proxy.source_type = parseSourceType();
else if (key == "source_format")
proxy.source_format = parseSourceFormat();
else if (key == "internal_format")
proxy.internal_format = parseInternalFormat();
else if (key == "source")
{
expect<Lexer::String>();
const osg::ref_ptr<osg::Image> image
= mImageManager.getImage(VFS::Path::Normalized(std::get<Lexer::String>(mToken).value), is3D);
if constexpr (is1D)
{
type = Types::SamplerType::Texture_1D;
sampler = new osg::Texture1D(image);
}
else if constexpr (is3D)
{
type = Types::SamplerType::Texture_3D;
sampler = new osg::Texture3D(image);
}
else
{
type = Types::SamplerType::Texture_2D;
sampler = new osg::Texture2D(image);
}
}
else
error(Misc::StringUtils::format("unexpected key '%s'", std::string{ key }));
expect<Lexer::SemiColon>();
}
if (!sampler)
error(Misc::StringUtils::format(
"%s '%s' requires a filename", std::string(T::repr), std::string{ mBlockName }));
if (!is1D)
{
sampler->setFilter(osg::Texture::MIN_FILTER, proxy.min_filter);
sampler->setFilter(osg::Texture::MAG_FILTER, proxy.mag_filter);
}
if (is3D)
sampler->setWrap(osg::Texture::WRAP_R, proxy.wrap_r);
sampler->setWrap(osg::Texture::WRAP_S, proxy.wrap_s);
sampler->setWrap(osg::Texture::WRAP_T, proxy.wrap_t);
sampler->setInternalFormatMode(proxy.compression);
if (proxy.internal_format.has_value())
sampler->setInternalFormat(proxy.internal_format.value());
if (proxy.source_type.has_value())
sampler->setSourceType(proxy.source_type.value());
if (proxy.internal_format.has_value())
sampler->setSourceFormat(proxy.internal_format.value());
sampler->setName(std::string{ mBlockName });
sampler->setResizeNonPowerOfTwoHint(false);
mTextures.emplace_back(sampler);
std::shared_ptr<Types::UniformBase> uniform = std::make_shared<Types::UniformBase>();
uniform->mSamplerType = type;
uniform->mName = std::string(mBlockName);
mDefinedUniforms.emplace_back(std::move(uniform));
}
template <class SrcT, class T>
SrcT Technique::getUniformValue()
{
constexpr bool isVec
= std::is_same_v<osg::Vec2f, SrcT> || std::is_same_v<osg::Vec3f, SrcT> || std::is_same_v<osg::Vec4f, SrcT>;
constexpr bool isFloat = std::is_same_v<float, SrcT>;
constexpr bool isInt = std::is_same_v<int, SrcT>;
constexpr bool isBool = std::is_same_v<bool, SrcT>;
static_assert(isVec || isFloat || isInt || isBool, "Unsupported type");
if constexpr (isVec)
{
return parseVec<SrcT, T>();
}
else if constexpr (isFloat)
{
return parseFloat();
}
else if constexpr (isInt)
{
return parseInteger();
}
else if constexpr (isBool)
{
return parseBool();
}
error(Misc::StringUtils::format("failed setting uniform type"));
}
template <class SrcT, class T>
void Technique::parseUniform()
{
if (findUniform(std::string(mBlockName)) != mDefinedUniforms.end())
error(Misc::StringUtils::format("redeclaration of uniform '%s'", std::string(mBlockName)));
std::shared_ptr<Types::UniformBase> uniform = std::make_shared<Types::UniformBase>();
Types::Uniform<SrcT> data = Types::Uniform<SrcT>();
while (!isNext<Lexer::Close_bracket>() && !isNext<Lexer::Eof>())
{
expect<Lexer::Literal>();
auto key = asLiteral();
expect<Lexer::Equal>("error parsing config for uniform block");
if (key == "default")
{
data.mDefault = getUniformValue<SrcT, T>();
}
else if (key == "size")
{
if constexpr (std::is_same_v<bool, SrcT>)
error("bool arrays currently unsupported");
int size = parseInteger();
if (size > 1)
data.mArray = std::vector<SrcT>(size);
}
else if (key == "min")
{
data.mMin = getUniformValue<SrcT, T>();
}
else if (key == "max")
{
data.mMax = getUniformValue<SrcT, T>();
}
else if (key == "step")
uniform->mStep = parseFloat();
else if (key == "static")
uniform->mStatic = parseBool();
else if (key == "description")
{
uniform->mDescription = parseString();
}
else if (key == "header")
{
uniform->mHeader = parseString();
}
else if (key == "display_name")
{
uniform->mDisplayName = parseString();
}
else if (key == "widget_type")
{
parseWidgetType<SrcT, T>(data);
}
else
error(Misc::StringUtils::format("unexpected key '%s'", std::string{ key }));
expect<Lexer::SemiColon>();
}
if (data.isArray())
uniform->mStatic = false;
uniform->mName = std::string(mBlockName);
uniform->mData = data;
uniform->mTechniqueName = mName;
if (data.mArray)
{
if constexpr (!std::is_same_v<bool, SrcT>)
{
if (auto cached = Settings::ShaderManager::get().getValue<std::vector<SrcT>>(mName, uniform->mName))
uniform->setValue(cached.value());
}
}
else if (auto cached = Settings::ShaderManager::get().getValue<SrcT>(mName, uniform->mName))
{
uniform->setValue(cached.value());
}
mDefinedUniforms.emplace_back(std::move(uniform));
}
template <>
void Technique::parseBlockImp<Lexer::Sampler_1D>()
{
parseSampler<Lexer::Sampler_1D>();
}
template <>
void Technique::parseBlockImp<Lexer::Sampler_2D>()
{
parseSampler<Lexer::Sampler_2D>();
}
template <>
void Technique::parseBlockImp<Lexer::Sampler_3D>()
{
parseSampler<Lexer::Sampler_3D>();
}
template <>
void Technique::parseBlockImp<Lexer::Uniform_Bool>()
{
parseUniform<bool, bool>();
}
template <>
void Technique::parseBlockImp<Lexer::Uniform_Float>()
{
parseUniform<float, float>();
}
template <>
void Technique::parseBlockImp<Lexer::Uniform_Int>()
{
parseUniform<int, int>();
}
template <>
void Technique::parseBlockImp<Lexer::Uniform_Vec2>()
{
parseUniform<osg::Vec2f, Lexer::Vec2>();
}
template <>
void Technique::parseBlockImp<Lexer::Uniform_Vec3>()
{
parseUniform<osg::Vec3f, Lexer::Vec3>();
}
template <>
void Technique::parseBlockImp<Lexer::Uniform_Vec4>()
{
parseUniform<osg::Vec4f, Lexer::Vec4>();
}
template <class T>
void Technique::expect(const std::string& err)
{
mToken = mLexer->next();
if (!std::holds_alternative<T>(mToken))
{
if (err.empty())
error(Misc::StringUtils::format("Expected %s", std::string(T::repr)));
else
error(Misc::StringUtils::format("%s. Expected %s", err, std::string(T::repr)));
}
}
template <class T, class T2>
void Technique::expect(const std::string& err)
{
mToken = mLexer->next();
if (!std::holds_alternative<T>(mToken) && !std::holds_alternative<T2>(mToken))
{
if (err.empty())
error(Misc::StringUtils::format(
"%s. Expected %s or %s", err, std::string(T::repr), std::string(T2::repr)));
else
error(Misc::StringUtils::format("Expected %s or %s", std::string(T::repr), std::string(T2::repr)));
}
}
template <class T>
bool Technique::isNext()
{
return std::holds_alternative<T>(mLexer->peek());
}
void Technique::parse(std::string&& buffer)
{
mBuffer = std::move(buffer);
Misc::StringUtils::replaceAll(mBuffer, "\r\n", "\n");
mLexer = std::make_unique<Lexer::Lexer>(mBuffer);
for (auto t = mLexer->next(); !std::holds_alternative<Lexer::Eof>(t); t = mLexer->next())
{
std::visit(
[this](auto&& arg) {
using T = std::decay_t<decltype(arg)>;
if constexpr (std::is_same_v<Lexer::Shared, T>)
parseBlock<Lexer::Shared>(false);
else if constexpr (std::is_same_v<Lexer::Technique, T>)
parseBlock<Lexer::Technique>(false);
else if constexpr (std::is_same_v<Lexer::Render_Target, T>)
parseBlock<Lexer::Render_Target>();
else if constexpr (std::is_same_v<Lexer::Vertex, T>)
parseBlock<Lexer::Vertex>();
else if constexpr (std::is_same_v<Lexer::Fragment, T>)
parseBlock<Lexer::Fragment>();
else if constexpr (std::is_same_v<Lexer::Compute, T>)
parseBlock<Lexer::Compute>();
else if constexpr (std::is_same_v<Lexer::Sampler_1D, T>)
parseBlock<Lexer::Sampler_1D>();
else if constexpr (std::is_same_v<Lexer::Sampler_2D, T>)
parseBlock<Lexer::Sampler_2D>();
else if constexpr (std::is_same_v<Lexer::Sampler_3D, T>)
parseBlock<Lexer::Sampler_3D>();
else if constexpr (std::is_same_v<Lexer::Uniform_Bool, T>)
parseBlock<Lexer::Uniform_Bool>();
else if constexpr (std::is_same_v<Lexer::Uniform_Float, T>)
parseBlock<Lexer::Uniform_Float>();
else if constexpr (std::is_same_v<Lexer::Uniform_Int, T>)
parseBlock<Lexer::Uniform_Int>();
else if constexpr (std::is_same_v<Lexer::Uniform_Vec2, T>)
parseBlock<Lexer::Uniform_Vec2>();
else if constexpr (std::is_same_v<Lexer::Uniform_Vec3, T>)
parseBlock<Lexer::Uniform_Vec3>();
else if constexpr (std::is_same_v<Lexer::Uniform_Vec4, T>)
parseBlock<Lexer::Uniform_Vec4>();
else
error("invalid top level block");
},
t);
}
}
template <class T>
void Technique::parseBlock(bool named)
{
mBlockName = T::repr;
if (named)
{
expect<Lexer::Literal>("name is required for preceeding block decleration");
mBlockName = std::get<Lexer::Literal>(mToken).value;
if (isNext<Lexer::Open_Parenthesis>())
parseBlockHeader();
}
expect<Lexer::Open_bracket>();
parseBlockImp<T>();
expect<Lexer::Close_bracket>();
}
template <class TDelimeter>
std::vector<std::string_view> Technique::parseLiteralList()
{
std::vector<std::string_view> data;
while (!isNext<Lexer::Eof>())
{
expect<Lexer::Literal>();
data.emplace_back(std::get<Lexer::Literal>(mToken).value);
if (!isNext<TDelimeter>())
break;
mLexer->next();
}
return data;
}
void Technique::parseBlockHeader()
{
expect<Lexer::Open_Parenthesis>();
if (isNext<Lexer::Close_Parenthesis>())
{
mLexer->next();
return;
}
auto& pass = mPassMap[mBlockName];
if (!pass)
pass = std::make_shared<fx::Pass>();
while (!isNext<Lexer::Eof>())
{
expect<Lexer::Literal>("invalid key in block header");
std::string_view key = std::get<Lexer::Literal>(mToken).value;
expect<Lexer::Equal>();
if (key == "target")
{
expect<Lexer::Literal>();
pass->mTarget = std::get<Lexer::Literal>(mToken).value;
}
else if (key == "rt1")
{
expect<Lexer::Literal>();
pass->mRenderTargets[0] = std::get<Lexer::Literal>(mToken).value;
}
else if (key == "rt2")
{
expect<Lexer::Literal>();
pass->mRenderTargets[1] = std::get<Lexer::Literal>(mToken).value;
}
else if (key == "rt3")
{
expect<Lexer::Literal>();
pass->mRenderTargets[2] = std::get<Lexer::Literal>(mToken).value;
}
else if (key == "blend")
{
expect<Lexer::Open_Parenthesis>();
osg::BlendEquation::Equation blendEq = parseBlendEquation();
expect<Lexer::Comma>();
osg::BlendFunc::BlendFuncMode blendSrc = parseBlendFuncMode();
expect<Lexer::Comma>();
osg::BlendFunc::BlendFuncMode blendDest = parseBlendFuncMode();
expect<Lexer::Close_Parenthesis>();
pass->mBlendSource = blendSrc;
pass->mBlendDest = blendDest;
if (blendEq != osg::BlendEquation::FUNC_ADD)
pass->mBlendEq = blendEq;
}
else
error(Misc::StringUtils::format("unrecognized key '%s' in block header", std::string(key)));
mToken = mLexer->next();
if (std::holds_alternative<Lexer::Comma>(mToken))
{
if (std::holds_alternative<Lexer::Close_Parenthesis>(mLexer->peek()))
error(Misc::StringUtils::format("leading comma in '%s' is not allowed", std::string(mBlockName)));
else
continue;
}
if (std::holds_alternative<Lexer::Close_Parenthesis>(mToken))
return;
}
error("malformed block header");
}
std::string_view Technique::asLiteral() const
{
return std::get<Lexer::Literal>(mToken).value;
}
FlagsType Technique::parseFlags()
{
auto parseBit = [this](std::string_view term) {
for (const auto& [identifer, bit] : constants::TechniqueFlag)
{
if (Misc::StringUtils::ciEqual(term, identifer))
return bit;
}
error(Misc::StringUtils::format("unrecognized flag '%s'", std::string(term)));
};
FlagsType flag = 0;
for (const auto& bit : parseLiteralList<Lexer::Comma>())
flag |= parseBit(bit);
return flag;
}
osg::Texture::FilterMode Technique::parseFilterMode()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::FilterMode)
{
if (asLiteral() == identifer)
return mode;
}
error(Misc::StringUtils::format("unrecognized filter mode '%s'", std::string{ asLiteral() }));
}
osg::Texture::WrapMode Technique::parseWrapMode()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::WrapMode)
{
if (asLiteral() == identifer)
return mode;
}
if (asLiteral() == "clamp")
error(
"unsupported wrap mode 'clamp'; 'clamp_to_edge' was likely intended, look for an updated shader or "
"contact author");
error(Misc::StringUtils::format("unrecognized wrap mode '%s'", std::string{ asLiteral() }));
}
osg::Texture::InternalFormatMode Technique::parseCompression()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::Compression)
{
if (asLiteral() == identifer)
return mode;
}
error(Misc::StringUtils::format("unrecognized compression '%s'", std::string{ asLiteral() }));
}
int Technique::parseInternalFormat()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::InternalFormat)
{
if (asLiteral() == identifer)
return mode;
}
error(Misc::StringUtils::format("unrecognized internal format '%s'", std::string{ asLiteral() }));
}
int Technique::parseSourceType()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::SourceType)
{
if (asLiteral() == identifer)
return mode;
}
error(Misc::StringUtils::format("unrecognized source type '%s'", std::string{ asLiteral() }));
}
int Technique::parseSourceFormat()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::SourceFormat)
{
if (asLiteral() == identifer)
return mode;
}
error(Misc::StringUtils::format("unrecognized source format '%s'", std::string{ asLiteral() }));
}
osg::BlendEquation::Equation Technique::parseBlendEquation()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::BlendEquation)
{
if (asLiteral() == identifer)
return mode;
}
error(Misc::StringUtils::format("unrecognized blend equation '%s'", std::string{ asLiteral() }));
}
osg::BlendFunc::BlendFuncMode Technique::parseBlendFuncMode()
{
expect<Lexer::Literal>();
for (const auto& [identifer, mode] : constants::BlendFunc)
{