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XCEngine/engine/src/Resources/Shader/ShaderAuthoringParser.cpp

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#include "ShaderAuthoringParser.h"
#include "ShaderSourceUtils.h"
#include <sstream>
#include <string>
#include <unordered_set>
#include <vector>
namespace XCEngine {
namespace Resources {
struct ExtractedProgramBlock {
enum class Kind {
SharedInclude,
PassProgram
};
Kind kind = Kind::PassProgram;
Containers::String sourceText;
size_t markerLine = 0;
};
bool TryTokenizeQuotedArguments(const std::string& line, std::vector<std::string>& outTokens);
std::string StripAuthoringLineComment(const std::string& line) {
bool inString = false;
bool escaped = false;
for (size_t index = 0; index + 1 < line.size(); ++index) {
const char ch = line[index];
if (escaped) {
escaped = false;
continue;
}
if (ch == '\\') {
escaped = true;
continue;
}
if (ch == '"') {
inString = !inString;
continue;
}
if (!inString && ch == '/' && line[index + 1] == '/') {
return line.substr(0, index);
}
}
return line;
}
bool StartsWithKeyword(const std::string& line, const char* keyword) {
const std::string keywordString(keyword);
if (line.size() < keywordString.size() ||
line.compare(0, keywordString.size(), keywordString) != 0) {
return false;
}
return line.size() == keywordString.size() ||
std::isspace(static_cast<unsigned char>(line[keywordString.size()])) != 0;
}
void SplitShaderAuthoringLines(
const std::string& sourceText,
std::vector<std::string>& outLines) {
outLines.clear();
std::istringstream stream(sourceText);
std::string rawLine;
while (std::getline(stream, rawLine)) {
std::string line = TrimCopy(StripAuthoringLineComment(rawLine));
if (line.empty()) {
continue;
}
if (!StartsWithKeyword(line, "Tags") &&
line.size() > 1 &&
line.back() == '{') {
line.pop_back();
const std::string prefix = TrimCopy(line);
if (!prefix.empty()) {
outLines.push_back(prefix);
}
outLines.push_back("{");
continue;
}
if (line.size() > 1 && line.front() == '}') {
outLines.push_back("}");
line = TrimCopy(line.substr(1));
if (!line.empty()) {
outLines.push_back(line);
}
continue;
}
outLines.push_back(line);
}
}
bool TryExtractProgramBlocks(
const std::string& sourceText,
std::vector<ExtractedProgramBlock>& outBlocks,
Containers::String* outError) {
outBlocks.clear();
std::istringstream stream(sourceText);
std::string rawLine;
bool insideBlock = false;
ExtractedProgramBlock currentBlock = {};
std::string blockSource;
size_t lineNumber = 0;
auto fail = [&outError](const std::string& message, size_t humanLine) -> bool {
if (outError != nullptr) {
*outError = Containers::String(
("Unity-style shader parse error at line " + std::to_string(humanLine) + ": " + message).c_str());
}
return false;
};
while (std::getline(stream, rawLine)) {
++lineNumber;
const std::string normalizedLine = TrimCopy(StripAuthoringLineComment(rawLine));
if (!insideBlock) {
if (normalizedLine == "HLSLINCLUDE" || normalizedLine == "CGINCLUDE") {
insideBlock = true;
currentBlock = {};
currentBlock.kind = ExtractedProgramBlock::Kind::SharedInclude;
currentBlock.markerLine = lineNumber;
blockSource.clear();
} else if (normalizedLine == "HLSLPROGRAM" || normalizedLine == "CGPROGRAM") {
insideBlock = true;
currentBlock = {};
currentBlock.kind = ExtractedProgramBlock::Kind::PassProgram;
currentBlock.markerLine = lineNumber;
blockSource.clear();
}
continue;
}
if (normalizedLine == "ENDHLSL" || normalizedLine == "ENDCG") {
currentBlock.sourceText = blockSource.c_str();
outBlocks.push_back(std::move(currentBlock));
insideBlock = false;
blockSource.clear();
continue;
}
blockSource += rawLine;
blockSource += '\n';
}
if (insideBlock) {
return fail("program block was not closed", lineNumber);
}
return true;
}
bool ContainsBackendPragma(const std::vector<std::string>& lines) {
for (const std::string& line : lines) {
if (line.rfind("#pragma backend", 0) == 0) {
return true;
}
}
return false;
}
bool ContainsResourcesBlock(const std::vector<std::string>& lines) {
for (const std::string& line : lines) {
if (line == "Resources" || StartsWithKeyword(line, "Resources")) {
return true;
}
}
return false;
}
bool ContainsSingleSourceAuthoringConstructs(const std::vector<std::string>& lines) {
for (const std::string& line : lines) {
if (line == "HLSLINCLUDE" || line == "CGINCLUDE") {
return true;
}
if (line.rfind("#pragma target", 0) == 0) {
return true;
}
}
return false;
}
MaterialRenderState BuildUnityDefaultFixedFunctionState() {
MaterialRenderState state = {};
state.blendEnable = false;
state.srcBlend = MaterialBlendFactor::One;
state.dstBlend = MaterialBlendFactor::Zero;
state.srcBlendAlpha = MaterialBlendFactor::One;
state.dstBlendAlpha = MaterialBlendFactor::Zero;
state.blendOp = MaterialBlendOp::Add;
state.blendOpAlpha = MaterialBlendOp::Add;
state.colorWriteMask = 0xF;
state.depthTestEnable = true;
state.depthWriteEnable = true;
state.depthFunc = MaterialComparisonFunc::LessEqual;
state.cullMode = MaterialCullMode::Back;
return state;
}
void EnsureAuthoringFixedFunctionStateInitialized(
bool& hasFixedFunctionState,
MaterialRenderState& fixedFunctionState) {
if (!hasFixedFunctionState) {
hasFixedFunctionState = true;
fixedFunctionState = BuildUnityDefaultFixedFunctionState();
}
}
bool TryParseUnityStyleBoolDirectiveToken(const std::string& token, bool& outValue) {
const Containers::String normalized = Containers::String(token.c_str()).Trim().ToLower();
if (normalized == "on") {
outValue = true;
return true;
}
if (normalized == "off") {
outValue = false;
return true;
}
return false;
}
bool TryParseUnityStyleCullMode(const std::string& token, MaterialCullMode& outMode) {
const Containers::String normalized = Containers::String(token.c_str()).Trim().ToLower();
if (normalized == "back") {
outMode = MaterialCullMode::Back;
return true;
}
if (normalized == "front") {
outMode = MaterialCullMode::Front;
return true;
}
if (normalized == "off") {
outMode = MaterialCullMode::None;
return true;
}
return false;
}
bool TryParseUnityStyleComparisonFunc(const std::string& token, MaterialComparisonFunc& outFunc) {
const Containers::String normalized = Containers::String(token.c_str()).Trim().ToLower();
if (normalized == "never") {
outFunc = MaterialComparisonFunc::Never;
return true;
}
if (normalized == "less") {
outFunc = MaterialComparisonFunc::Less;
return true;
}
if (normalized == "equal") {
outFunc = MaterialComparisonFunc::Equal;
return true;
}
if (normalized == "lequal" || normalized == "lessequal" || normalized == "less_equal") {
outFunc = MaterialComparisonFunc::LessEqual;
return true;
}
if (normalized == "greater") {
outFunc = MaterialComparisonFunc::Greater;
return true;
}
if (normalized == "notequal" || normalized == "not_equal") {
outFunc = MaterialComparisonFunc::NotEqual;
return true;
}
if (normalized == "gequal" || normalized == "greaterequal" || normalized == "greater_equal") {
outFunc = MaterialComparisonFunc::GreaterEqual;
return true;
}
if (normalized == "always") {
outFunc = MaterialComparisonFunc::Always;
return true;
}
return false;
}
bool TryParseUnityStyleBlendFactor(const std::string& token, MaterialBlendFactor& outFactor) {
const Containers::String normalized = Containers::String(token.c_str()).Trim().ToLower();
if (normalized == "zero") {
outFactor = MaterialBlendFactor::Zero;
return true;
}
if (normalized == "one") {
outFactor = MaterialBlendFactor::One;
return true;
}
if (normalized == "srccolor" || normalized == "src_color") {
outFactor = MaterialBlendFactor::SrcColor;
return true;
}
if (normalized == "oneminussrccolor" || normalized == "one_minus_src_color" || normalized == "invsrccolor") {
outFactor = MaterialBlendFactor::InvSrcColor;
return true;
}
if (normalized == "srcalpha" || normalized == "src_alpha") {
outFactor = MaterialBlendFactor::SrcAlpha;
return true;
}
if (normalized == "oneminussrcalpha" || normalized == "one_minus_src_alpha" || normalized == "invsrcalpha") {
outFactor = MaterialBlendFactor::InvSrcAlpha;
return true;
}
if (normalized == "dstalpha" || normalized == "dst_alpha") {
outFactor = MaterialBlendFactor::DstAlpha;
return true;
}
if (normalized == "oneminusdstalpha" || normalized == "one_minus_dst_alpha" || normalized == "invdstalpha") {
outFactor = MaterialBlendFactor::InvDstAlpha;
return true;
}
if (normalized == "dstcolor" || normalized == "dst_color") {
outFactor = MaterialBlendFactor::DstColor;
return true;
}
if (normalized == "oneminusdstcolor" || normalized == "one_minus_dst_color" || normalized == "invdstcolor") {
outFactor = MaterialBlendFactor::InvDstColor;
return true;
}
if (normalized == "srcalphasaturate" || normalized == "src_alpha_saturate" || normalized == "srcalphasat") {
outFactor = MaterialBlendFactor::SrcAlphaSat;
return true;
}
return false;
}
bool TryParseUnityStyleColorMask(const std::string& token, Core::uint8& outMask) {
const Containers::String normalized = Containers::String(token.c_str()).Trim().ToUpper();
if (normalized == "0") {
outMask = 0u;
return true;
}
Core::uint8 mask = 0u;
for (size_t index = 0; index < normalized.Length(); ++index) {
switch (normalized[index]) {
case 'R':
mask |= 0x1u;
break;
case 'G':
mask |= 0x2u;
break;
case 'B':
mask |= 0x4u;
break;
case 'A':
mask |= 0x8u;
break;
default:
return false;
}
}
outMask = mask;
return true;
}
bool TryParseUnityStyleBlendDirective(
const std::vector<std::string>& tokens,
MaterialRenderState& outState) {
std::vector<std::string> normalizedTokens;
normalizedTokens.reserve(tokens.size());
for (const std::string& token : tokens) {
if (token == ",") {
continue;
}
std::string normalizedToken = token;
while (!normalizedToken.empty() && normalizedToken.back() == ',') {
normalizedToken.pop_back();
}
if (!normalizedToken.empty()) {
normalizedTokens.push_back(std::move(normalizedToken));
}
}
if (normalizedTokens.size() != 2u &&
normalizedTokens.size() != 3u &&
normalizedTokens.size() != 5u) {
return false;
}
if (normalizedTokens.size() == 2u) {
bool enabled = false;
if (!TryParseUnityStyleBoolDirectiveToken(normalizedTokens[1], enabled)) {
return false;
}
outState.blendEnable = enabled;
if (!enabled) {
outState.srcBlend = MaterialBlendFactor::One;
outState.dstBlend = MaterialBlendFactor::Zero;
outState.srcBlendAlpha = MaterialBlendFactor::One;
outState.dstBlendAlpha = MaterialBlendFactor::Zero;
}
return true;
}
MaterialBlendFactor srcBlend = MaterialBlendFactor::One;
MaterialBlendFactor dstBlend = MaterialBlendFactor::Zero;
if (!TryParseUnityStyleBlendFactor(normalizedTokens[1], srcBlend) ||
!TryParseUnityStyleBlendFactor(normalizedTokens[2], dstBlend)) {
return false;
}
outState.blendEnable = true;
outState.srcBlend = srcBlend;
outState.dstBlend = dstBlend;
if (normalizedTokens.size() == 5u) {
if (!TryParseUnityStyleBlendFactor(normalizedTokens[3], outState.srcBlendAlpha) ||
!TryParseUnityStyleBlendFactor(normalizedTokens[4], outState.dstBlendAlpha)) {
return false;
}
} else {
outState.srcBlendAlpha = srcBlend;
outState.dstBlendAlpha = dstBlend;
}
return true;
}
void SetOrReplaceAuthoringTag(
std::vector<AuthoringTagEntry>& tags,
const Containers::String& name,
const Containers::String& value) {
for (AuthoringTagEntry& tag : tags) {
if (tag.name == name) {
tag.value = value;
return;
}
}
tags.push_back({ name, value });
}
ShaderAuthoringStyle DetectShaderAuthoringStyle(const std::string& sourceText) {
std::vector<std::string> lines;
SplitShaderAuthoringLines(sourceText, lines);
if (lines.empty() || !StartsWithKeyword(lines.front(), "Shader")) {
return ShaderAuthoringStyle::NotShaderAuthoring;
}
const bool hasBackendPragma = ContainsBackendPragma(lines);
const bool hasSingleSourceConstructs = ContainsSingleSourceAuthoringConstructs(lines);
if (hasBackendPragma && !hasSingleSourceConstructs) {
return ShaderAuthoringStyle::LegacyBackendSplit;
}
if (ContainsResourcesBlock(lines)) {
return ShaderAuthoringStyle::UnityStyleSingleSource;
}
if (hasSingleSourceConstructs) {
return ShaderAuthoringStyle::UnityStyleSingleSource;
}
return ShaderAuthoringStyle::UnityStyleSingleSource;
}
void AppendAuthoringSourceBlock(
Containers::String& target,
const Containers::String& sourceBlock) {
if (sourceBlock.Empty()) {
return;
}
if (!target.Empty()) {
target += '\n';
}
target += sourceBlock;
}
void CollectQuotedIncludeDependencyPaths(
const Containers::String& sourcePath,
const Containers::String& sourceText,
std::unordered_set<std::string>& seenPaths,
Containers::Array<Containers::String>& outDependencies) {
std::istringstream stream(ToStdString(sourceText));
std::string rawLine;
while (std::getline(stream, rawLine)) {
const std::string line = TrimCopy(StripAuthoringLineComment(rawLine));
if (line.rfind("#include", 0) != 0) {
continue;
}
const size_t firstQuote = line.find('"');
if (firstQuote == std::string::npos) {
continue;
}
const size_t secondQuote = line.find('"', firstQuote + 1);
if (secondQuote == std::string::npos || secondQuote <= firstQuote + 1) {
continue;
}
const Containers::String includePath(line.substr(firstQuote + 1, secondQuote - firstQuote - 1).c_str());
const Containers::String resolvedPath = ResolveShaderDependencyPath(includePath, sourcePath);
const std::string key = ToStdString(resolvedPath);
if (!key.empty() && seenPaths.insert(key).second) {
outDependencies.PushBack(resolvedPath);
}
}
}
bool IsUnityStyleAuthoringPragmaDirective(const std::string& line) {
std::vector<std::string> pragmaTokens;
if (!TryTokenizeQuotedArguments(line, pragmaTokens) ||
pragmaTokens.empty() ||
pragmaTokens[0] != "#pragma" ||
pragmaTokens.size() < 2u) {
return false;
}
return pragmaTokens[1] == "vertex" ||
pragmaTokens[1] == "fragment" ||
pragmaTokens[1] == "target" ||
pragmaTokens[1] == "multi_compile" ||
pragmaTokens[1] == "multi_compile_local" ||
pragmaTokens[1] == "shader_feature" ||
pragmaTokens[1] == "shader_feature_local" ||
pragmaTokens[1] == "backend";
}
Containers::String StripUnityStyleAuthoringPragmas(const Containers::String& sourceText) {
std::istringstream stream(ToStdString(sourceText));
std::string rawLine;
std::string strippedSource;
while (std::getline(stream, rawLine)) {
const std::string normalizedLine = TrimCopy(StripAuthoringLineComment(rawLine));
if (IsUnityStyleAuthoringPragmaDirective(normalizedLine)) {
continue;
}
strippedSource += rawLine;
strippedSource += '\n';
}
return strippedSource.c_str();
}
Containers::String BuildShaderKeywordSetSignature(const ShaderKeywordSet& keywordSet) {
ShaderKeywordSet normalizedKeywords = keywordSet;
NormalizeShaderKeywordSetInPlace(normalizedKeywords);
Containers::String signature;
for (size_t keywordIndex = 0; keywordIndex < normalizedKeywords.enabledKeywords.Size(); ++keywordIndex) {
if (keywordIndex > 0) {
signature += ";";
}
signature += normalizedKeywords.enabledKeywords[keywordIndex];
}
return signature;
}
std::vector<ShaderKeywordSet> BuildShaderKeywordVariantSets(
const Containers::Array<ShaderKeywordDeclaration>& declarations) {
std::vector<ShaderKeywordSet> keywordSets(1);
for (const ShaderKeywordDeclaration& declaration : declarations) {
if (declaration.options.Empty()) {
continue;
}
std::vector<ShaderKeywordSet> nextKeywordSets;
std::unordered_set<std::string> seenSignatures;
nextKeywordSets.reserve(keywordSets.size() * declaration.options.Size());
for (const ShaderKeywordSet& currentKeywordSet : keywordSets) {
for (const Containers::String& option : declaration.options) {
ShaderKeywordSet nextKeywordSet = currentKeywordSet;
const Containers::String normalizedKeyword = NormalizeShaderKeywordToken(option);
if (!normalizedKeyword.Empty()) {
nextKeywordSet.enabledKeywords.PushBack(normalizedKeyword);
}
NormalizeShaderKeywordSetInPlace(nextKeywordSet);
const std::string signature =
ToStdString(BuildShaderKeywordSetSignature(nextKeywordSet));
if (seenSignatures.insert(signature).second) {
nextKeywordSets.push_back(std::move(nextKeywordSet));
}
}
}
if (!nextKeywordSets.empty()) {
keywordSets = std::move(nextKeywordSets);
}
}
if (keywordSets.empty()) {
keywordSets.emplace_back();
}
return keywordSets;
}
Containers::String BuildKeywordVariantSource(
const Containers::String& baseSource,
const ShaderKeywordSet& requiredKeywords) {
if (requiredKeywords.enabledKeywords.Empty()) {
return baseSource;
}
std::string defineBlock;
for (const Containers::String& keyword : requiredKeywords.enabledKeywords) {
defineBlock += "#define ";
defineBlock += ToStdString(keyword);
defineBlock += " 1\n";
}
if (baseSource.Empty()) {
return Containers::String(defineBlock.c_str());
}
const std::string sourceText = ToStdString(baseSource);
size_t lineStart = 0;
while (lineStart < sourceText.size()) {
const size_t lineEnd = sourceText.find_first_of("\r\n", lineStart);
const size_t lineLength =
lineEnd == std::string::npos ? sourceText.size() - lineStart : lineEnd - lineStart;
const std::string line = sourceText.substr(lineStart, lineLength);
const std::string trimmedLine = TrimCopy(line);
if (trimmedLine.empty() ||
trimmedLine.rfind("//", 0) == 0u ||
trimmedLine.rfind("/*", 0) == 0u ||
trimmedLine.rfind("*", 0) == 0u) {
if (lineEnd == std::string::npos) {
break;
}
lineStart = lineEnd + 1u;
if (sourceText[lineEnd] == '\r' &&
lineStart < sourceText.size() &&
sourceText[lineStart] == '\n') {
++lineStart;
}
continue;
}
if (trimmedLine.rfind("#version", 0) != 0u) {
break;
}
size_t insertionPos = lineEnd == std::string::npos ? sourceText.size() : lineEnd + 1u;
if (lineEnd != std::string::npos &&
sourceText[lineEnd] == '\r' &&
insertionPos < sourceText.size() &&
sourceText[insertionPos] == '\n') {
++insertionPos;
}
std::string variantSource = sourceText.substr(0, insertionPos);
variantSource += defineBlock;
variantSource += sourceText.substr(insertionPos);
return Containers::String(variantSource.c_str());
}
std::string variantSource = defineBlock;
variantSource += '\n';
variantSource += sourceText;
return Containers::String(variantSource.c_str());
}
bool TryParseShaderKeywordDeclarationPragma(
const std::vector<std::string>& pragmaTokens,
ShaderKeywordDeclaration& outDeclaration) {
outDeclaration = {};
if (pragmaTokens.size() < 3u) {
return false;
}
if (pragmaTokens[1] == "multi_compile") {
outDeclaration.type = ShaderKeywordDeclarationType::MultiCompile;
} else if (pragmaTokens[1] == "multi_compile_local") {
outDeclaration.type = ShaderKeywordDeclarationType::MultiCompileLocal;
} else if (pragmaTokens[1] == "shader_feature") {
outDeclaration.type = ShaderKeywordDeclarationType::ShaderFeature;
} else if (pragmaTokens[1] == "shader_feature_local") {
outDeclaration.type = ShaderKeywordDeclarationType::ShaderFeatureLocal;
} else {
return false;
}
for (size_t tokenIndex = 2; tokenIndex < pragmaTokens.size(); ++tokenIndex) {
outDeclaration.options.PushBack(pragmaTokens[tokenIndex].c_str());
}
return !outDeclaration.options.Empty();
}
size_t FindMatchingDelimiter(
const std::string& text,
size_t openPos,
char openChar,
char closeChar) {
if (openPos >= text.size() || text[openPos] != openChar) {
return std::string::npos;
}
bool inString = false;
bool escaped = false;
int depth = 0;
for (size_t pos = openPos; pos < text.size(); ++pos) {
const char ch = text[pos];
if (escaped) {
escaped = false;
continue;
}
if (ch == '\\') {
escaped = true;
continue;
}
if (ch == '"') {
inString = !inString;
continue;
}
if (inString) {
continue;
}
if (ch == openChar) {
++depth;
} else if (ch == closeChar) {
--depth;
if (depth == 0) {
return pos;
}
}
}
return std::string::npos;
}
size_t FindFirstTopLevelChar(const std::string& text, char target) {
bool inString = false;
bool escaped = false;
int roundDepth = 0;
int squareDepth = 0;
for (size_t pos = 0; pos < text.size(); ++pos) {
const char ch = text[pos];
if (escaped) {
escaped = false;
continue;
}
if (ch == '\\') {
escaped = true;
continue;
}
if (ch == '"') {
inString = !inString;
continue;
}
if (inString) {
continue;
}
if (ch == target && roundDepth == 0 && squareDepth == 0) {
return pos;
}
if (ch == '(') {
++roundDepth;
continue;
}
if (ch == ')') {
--roundDepth;
continue;
}
if (ch == '[') {
++squareDepth;
continue;
}
if (ch == ']') {
--squareDepth;
continue;
}
}
return std::string::npos;
}
bool SplitCommaSeparatedAuthoring(const std::string& text, std::vector<std::string>& outParts) {
outParts.clear();
bool inString = false;
bool escaped = false;
int roundDepth = 0;
int squareDepth = 0;
size_t partStart = 0;
for (size_t pos = 0; pos < text.size(); ++pos) {
const char ch = text[pos];
if (escaped) {
escaped = false;
continue;
}
if (ch == '\\') {
escaped = true;
continue;
}
if (ch == '"') {
inString = !inString;
continue;
}
if (inString) {
continue;
}
if (ch == '(') {
++roundDepth;
continue;
}
if (ch == ')') {
--roundDepth;
continue;
}
if (ch == '[') {
++squareDepth;
continue;
}
if (ch == ']') {
--squareDepth;
continue;
}
if (ch == ',' && roundDepth == 0 && squareDepth == 0) {
outParts.push_back(TrimCopy(text.substr(partStart, pos - partStart)));
partStart = pos + 1;
}
}
outParts.push_back(TrimCopy(text.substr(partStart)));
return true;
}
Containers::String UnquoteAuthoringValue(const std::string& text) {
const std::string trimmed = TrimCopy(text);
if (trimmed.size() >= 2 &&
trimmed.front() == '"' &&
trimmed.back() == '"') {
Containers::String parsed;
if (ParseQuotedString(trimmed, 0, parsed)) {
return parsed;
}
}
return Containers::String(trimmed.c_str());
}
bool TryTokenizeQuotedArguments(const std::string& line, std::vector<std::string>& outTokens) {
outTokens.clear();
std::string current;
bool inString = false;
bool escaped = false;
for (size_t pos = 0; pos < line.size(); ++pos) {
const char ch = line[pos];
if (escaped) {
current.push_back(ch);
escaped = false;
continue;
}
if (ch == '\\' && inString) {
escaped = true;
continue;
}
if (ch == '"') {
inString = !inString;
continue;
}
if (!inString && std::isspace(static_cast<unsigned char>(ch)) != 0) {
if (!current.empty()) {
outTokens.push_back(current);
current.clear();
}
continue;
}
current.push_back(ch);
}
if (inString) {
return false;
}
if (!current.empty()) {
outTokens.push_back(current);
}
return !outTokens.empty();
}
bool TryParseInlineTagAssignments(
const std::string& line,
std::vector<AuthoringTagEntry>& outTags) {
const size_t openBrace = line.find('{');
const size_t closeBrace = line.rfind('}');
if (openBrace == std::string::npos ||
closeBrace == std::string::npos ||
closeBrace <= openBrace) {
return false;
}
const std::string content = line.substr(openBrace + 1, closeBrace - openBrace - 1);
size_t pos = 0;
while (pos < content.size()) {
pos = SkipWhitespace(content, pos);
while (pos < content.size() && content[pos] == ',') {
++pos;
pos = SkipWhitespace(content, pos);
}
if (pos >= content.size()) {
break;
}
Containers::String key;
if (!ParseQuotedString(content, pos, key, &pos)) {
return false;
}
pos = SkipWhitespace(content, pos);
if (pos >= content.size() || content[pos] != '=') {
return false;
}
pos = SkipWhitespace(content, pos + 1);
Containers::String value;
if (!ParseQuotedString(content, pos, value, &pos)) {
return false;
}
outTags.push_back({ key, value });
}
return true;
}
bool TryParseSemanticAttributes(
const std::string& attributesText,
Containers::String& outSemantic) {
outSemantic.Clear();
size_t pos = 0;
while (pos < attributesText.size()) {
pos = attributesText.find('[', pos);
if (pos == std::string::npos) {
break;
}
const size_t closePos = FindMatchingDelimiter(attributesText, pos, '[', ']');
if (closePos == std::string::npos) {
return false;
}
const std::string attributeBody = TrimCopy(attributesText.substr(pos + 1, closePos - pos - 1));
if (attributeBody.size() > 10 &&
attributeBody.compare(0, 9, "Semantic(") == 0 &&
attributeBody.back() == ')') {
outSemantic = UnquoteAuthoringValue(attributeBody.substr(9, attributeBody.size() - 10));
}
pos = closePos + 1;
}
return true;
}
bool TryParseAuthoringPropertyLine(
const std::string& line,
ShaderPropertyDesc& outProperty) {
outProperty = {};
const size_t openParen = line.find('(');
if (openParen == std::string::npos) {
return false;
}
const size_t closeParen = FindMatchingDelimiter(line, openParen, '(', ')');
if (closeParen == std::string::npos) {
return false;
}
outProperty.name = Containers::String(TrimCopy(line.substr(0, openParen)).c_str());
if (outProperty.name.Empty()) {
return false;
}
std::vector<std::string> headerParts;
if (!SplitCommaSeparatedAuthoring(line.substr(openParen + 1, closeParen - openParen - 1), headerParts) ||
headerParts.size() < 2u) {
return false;
}
outProperty.displayName = UnquoteAuthoringValue(headerParts[0]);
std::string propertyTypeName = headerParts[1];
for (size_t index = 2; index < headerParts.size(); ++index) {
propertyTypeName += ",";
propertyTypeName += headerParts[index];
}
propertyTypeName = TrimCopy(propertyTypeName);
const size_t rangePos = propertyTypeName.find('(');
if (rangePos != std::string::npos &&
TrimCopy(propertyTypeName.substr(0, rangePos)) == "Range") {
propertyTypeName = "Range";
}
if (!TryParseShaderPropertyType(propertyTypeName.c_str(), outProperty.type)) {
return false;
}
const size_t equalsPos = line.find('=', closeParen + 1);
if (equalsPos == std::string::npos) {
return false;
}
const std::string tail = TrimCopy(line.substr(equalsPos + 1));
const size_t attributePos = FindFirstTopLevelChar(tail, '[');
const std::string defaultValueText =
attributePos == std::string::npos ? tail : TrimCopy(tail.substr(0, attributePos));
if (defaultValueText.empty()) {
return false;
}
outProperty.defaultValue = UnquoteAuthoringValue(defaultValueText);
if (attributePos != std::string::npos &&
!TryParseSemanticAttributes(tail.substr(attributePos), outProperty.semantic)) {
return false;
}
return true;
}
bool TryParseAuthoringResourceLine(
const std::string& line,
ShaderResourceBindingDesc& outBinding) {
outBinding = {};
const size_t openParen = line.find('(');
if (openParen == std::string::npos) {
return false;
}
const size_t closeParen = FindMatchingDelimiter(line, openParen, '(', ')');
if (closeParen == std::string::npos) {
return false;
}
outBinding.name = Containers::String(TrimCopy(line.substr(0, openParen)).c_str());
if (outBinding.name.Empty()) {
return false;
}
std::vector<std::string> parts;
if (!SplitCommaSeparatedAuthoring(line.substr(openParen + 1, closeParen - openParen - 1), parts) ||
parts.size() != 3u) {
return false;
}
if (!TryParseShaderResourceType(parts[0].c_str(), outBinding.type)) {
return false;
}
try {
outBinding.set = static_cast<Core::uint32>(std::stoul(parts[1]));
outBinding.binding = static_cast<Core::uint32>(std::stoul(parts[2]));
} catch (...) {
return false;
}
const size_t attributePos = FindFirstTopLevelChar(line.substr(closeParen + 1), '[');
if (attributePos != std::string::npos) {
const std::string attributesText = line.substr(closeParen + 1 + attributePos);
if (!TryParseSemanticAttributes(attributesText, outBinding.semantic)) {
return false;
}
}
return true;
}
bool ParseLegacyBackendSplitShaderAuthoring(
const Containers::String& path,
const std::string& sourceText,
AuthoringShaderDesc& outDesc,
Containers::String* outError) {
(void)path;
outDesc = {};
enum class BlockKind {
None,
Shader,
Properties,
SubShader,
Pass,
Resources
};
auto fail = [&outError](const std::string& message, size_t lineNumber) -> bool {
if (outError != nullptr) {
*outError = Containers::String(
("Legacy shader parse error at line " + std::to_string(lineNumber) + ": " + message).c_str());
}
return false;
};
std::vector<std::string> lines;
SplitShaderAuthoringLines(sourceText, lines);
if (lines.empty()) {
return fail("shader file is empty", 0);
}
std::vector<BlockKind> blockStack;
BlockKind pendingBlock = BlockKind::None;
AuthoringSubShaderEntry* currentSubShader = nullptr;
AuthoringPassEntry* currentPass = nullptr;
bool inProgram = false;
auto currentBlock = [&blockStack]() -> BlockKind {
return blockStack.empty() ? BlockKind::None : blockStack.back();
};
for (size_t lineIndex = 0; lineIndex < lines.size(); ++lineIndex) {
const std::string& line = lines[lineIndex];
const size_t humanLine = lineIndex + 1;
if (inProgram) {
if (line == "ENDHLSL" || line == "ENDCG") {
inProgram = false;
continue;
}
std::vector<std::string> pragmaTokens;
if (!TryTokenizeQuotedArguments(line, pragmaTokens) || pragmaTokens.empty()) {
continue;
}
if (pragmaTokens[0] != "#pragma") {
continue;
}
if (pragmaTokens.size() >= 3u && pragmaTokens[1] == "vertex") {
currentPass->vertexEntryPoint = pragmaTokens[2].c_str();
continue;
}
if (pragmaTokens.size() >= 3u && pragmaTokens[1] == "fragment") {
currentPass->fragmentEntryPoint = pragmaTokens[2].c_str();
continue;
}
if (pragmaTokens.size() >= 6u && pragmaTokens[1] == "backend") {
AuthoringBackendVariantEntry backendVariant = {};
if (!TryParseShaderBackend(pragmaTokens[2].c_str(), backendVariant.backend)) {
return fail("invalid backend pragma backend name", humanLine);
}
if (!TryParseShaderLanguage(pragmaTokens[3].c_str(), backendVariant.language)) {
return fail("invalid backend pragma language name", humanLine);
}
backendVariant.vertexSourcePath = pragmaTokens[4].c_str();
backendVariant.fragmentSourcePath = pragmaTokens[5].c_str();
if (pragmaTokens.size() >= 7u) {
backendVariant.vertexProfile = pragmaTokens[6].c_str();
}
if (pragmaTokens.size() >= 8u) {
backendVariant.fragmentProfile = pragmaTokens[7].c_str();
}
currentPass->backendVariants.push_back(std::move(backendVariant));
continue;
}
if (pragmaTokens.size() >= 2u &&
(pragmaTokens[1] == "multi_compile" ||
pragmaTokens[1] == "multi_compile_local" ||
pragmaTokens[1] == "shader_feature" ||
pragmaTokens[1] == "shader_feature_local")) {
ShaderKeywordDeclaration declaration = {};
if (!TryParseShaderKeywordDeclarationPragma(pragmaTokens, declaration)) {
return fail("keyword pragma must declare at least one option", humanLine);
}
currentPass->keywordDeclarations.PushBack(declaration);
continue;
}
continue;
}
if (line == "{") {
switch (pendingBlock) {
case BlockKind::Shader:
blockStack.push_back(BlockKind::Shader);
break;
case BlockKind::Properties:
blockStack.push_back(BlockKind::Properties);
break;
case BlockKind::SubShader:
outDesc.subShaders.emplace_back();
currentSubShader = &outDesc.subShaders.back();
blockStack.push_back(BlockKind::SubShader);
break;
case BlockKind::Pass:
if (currentSubShader == nullptr) {
return fail("pass block must be inside a SubShader", humanLine);
}
currentSubShader->passes.emplace_back();
currentPass = &currentSubShader->passes.back();
blockStack.push_back(BlockKind::Pass);
break;
case BlockKind::Resources:
if (currentPass == nullptr) {
return fail("resources block must be inside a Pass", humanLine);
}
blockStack.push_back(BlockKind::Resources);
break;
case BlockKind::None:
default:
return fail("unexpected opening brace", humanLine);
}
pendingBlock = BlockKind::None;
continue;
}
if (line == "}") {
if (blockStack.empty()) {
return fail("unexpected closing brace", humanLine);
}
const BlockKind closingBlock = blockStack.back();
blockStack.pop_back();
if (closingBlock == BlockKind::Pass) {
currentPass = nullptr;
} else if (closingBlock == BlockKind::SubShader) {
currentSubShader = nullptr;
}
continue;
}
if (StartsWithKeyword(line, "Shader")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() < 2u) {
return fail("Shader declaration is missing a name", humanLine);
}
outDesc.name = tokens[1].c_str();
pendingBlock = BlockKind::Shader;
continue;
}
if (line == "Properties") {
pendingBlock = BlockKind::Properties;
continue;
}
if (currentBlock() == BlockKind::Shader && StartsWithKeyword(line, "Fallback")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() < 2u) {
return fail("Fallback directive is missing a value", humanLine);
}
outDesc.fallback = tokens[1].c_str();
continue;
}
if (StartsWithKeyword(line, "SubShader")) {
pendingBlock = BlockKind::SubShader;
continue;
}
if (StartsWithKeyword(line, "Pass")) {
pendingBlock = BlockKind::Pass;
continue;
}
if (line == "Resources") {
pendingBlock = BlockKind::Resources;
continue;
}
if (StartsWithKeyword(line, "Tags")) {
std::vector<AuthoringTagEntry> parsedTags;
if (!TryParseInlineTagAssignments(line, parsedTags)) {
return fail("Tags block must use inline key/value pairs", humanLine);
}
if (currentPass != nullptr) {
currentPass->tags.insert(currentPass->tags.end(), parsedTags.begin(), parsedTags.end());
} else if (currentSubShader != nullptr) {
currentSubShader->tags.insert(currentSubShader->tags.end(), parsedTags.begin(), parsedTags.end());
} else {
return fail("Tags block is only supported inside SubShader or Pass", humanLine);
}
continue;
}
if (currentBlock() == BlockKind::Properties) {
ShaderPropertyDesc property = {};
if (!TryParseAuthoringPropertyLine(line, property)) {
return fail("invalid Properties entry", humanLine);
}
outDesc.properties.PushBack(property);
continue;
}
if (currentBlock() == BlockKind::Resources) {
ShaderResourceBindingDesc resourceBinding = {};
if (!TryParseAuthoringResourceLine(line, resourceBinding)) {
return fail("invalid Resources entry", humanLine);
}
currentPass->resources.PushBack(resourceBinding);
continue;
}
if (currentBlock() == BlockKind::Pass && currentPass != nullptr) {
if (StartsWithKeyword(line, "Name")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() < 2u) {
return fail("pass Name directive is missing a value", humanLine);
}
currentPass->name = tokens[1].c_str();
continue;
}
if (line == "HLSLPROGRAM" || line == "CGPROGRAM") {
inProgram = true;
continue;
}
}
return fail("unsupported authoring statement: " + line, humanLine);
}
if (inProgram) {
return fail("program block was not closed", lines.size());
}
if (!blockStack.empty()) {
return fail("one or more blocks were not closed", lines.size());
}
if (outDesc.name.Empty()) {
return fail("shader name is missing", 0);
}
if (outDesc.subShaders.empty()) {
return fail("shader does not declare any SubShader blocks", 0);
}
for (const AuthoringSubShaderEntry& subShader : outDesc.subShaders) {
if (subShader.passes.empty()) {
continue;
}
for (const AuthoringPassEntry& pass : subShader.passes) {
if (pass.name.Empty()) {
return fail("a Pass is missing a Name directive", 0);
}
if (pass.backendVariants.empty()) {
return fail("a Pass is missing backend variants", 0);
}
}
}
return true;
}
bool ParseUnityStyleSingleSourceShaderAuthoring(
const Containers::String& path,
const std::string& sourceText,
AuthoringShaderDesc& outDesc,
Containers::String* outError) {
(void)path;
outDesc = {};
enum class BlockKind {
None,
Shader,
Properties,
SubShader,
Pass
};
auto fail = [&outError](const std::string& message, size_t lineNumber) -> bool {
if (outError != nullptr) {
*outError = Containers::String(
("Unity-style shader parse error at line " + std::to_string(lineNumber) + ": " + message).c_str());
}
return false;
};
std::vector<std::string> lines;
SplitShaderAuthoringLines(sourceText, lines);
if (lines.empty()) {
return fail("shader file is empty", 0);
}
std::vector<ExtractedProgramBlock> extractedBlocks;
Containers::String extractionError;
if (!TryExtractProgramBlocks(sourceText, extractedBlocks, &extractionError)) {
if (outError != nullptr) {
*outError = extractionError;
}
return false;
}
size_t nextExtractedBlock = 0;
std::vector<BlockKind> blockStack;
BlockKind pendingBlock = BlockKind::None;
AuthoringSubShaderEntry* currentSubShader = nullptr;
AuthoringPassEntry* currentPass = nullptr;
bool inProgramBlock = false;
bool inSharedIncludeBlock = false;
auto currentBlock = [&blockStack]() -> BlockKind {
return blockStack.empty() ? BlockKind::None : blockStack.back();
};
auto consumeExtractedBlock = [&](ExtractedProgramBlock::Kind expectedKind,
Containers::String& destination,
bool append,
size_t humanLine) -> bool {
if (nextExtractedBlock >= extractedBlocks.size()) {
return fail("program block source extraction is out of sync", humanLine);
}
const ExtractedProgramBlock& block = extractedBlocks[nextExtractedBlock++];
if (block.kind != expectedKind) {
return fail("program block source extraction mismatched block kind", humanLine);
}
if (append) {
AppendAuthoringSourceBlock(destination, block.sourceText);
} else {
destination = block.sourceText;
}
return true;
};
for (size_t lineIndex = 0; lineIndex < lines.size(); ++lineIndex) {
const std::string& line = lines[lineIndex];
const size_t humanLine = lineIndex + 1;
if (inSharedIncludeBlock || inProgramBlock) {
if (line == "ENDHLSL" || line == "ENDCG") {
inSharedIncludeBlock = false;
inProgramBlock = false;
continue;
}
std::vector<std::string> pragmaTokens;
if (!TryTokenizeQuotedArguments(line, pragmaTokens) || pragmaTokens.empty()) {
continue;
}
if (pragmaTokens[0] != "#pragma") {
continue;
}
if (pragmaTokens.size() >= 2u && pragmaTokens[1] == "backend") {
return fail("Unity-style single-source shaders must not use #pragma backend", humanLine);
}
if (inSharedIncludeBlock) {
continue;
}
if (pragmaTokens.size() >= 3u && pragmaTokens[1] == "vertex") {
currentPass->vertexEntryPoint = pragmaTokens[2].c_str();
continue;
}
if (pragmaTokens.size() >= 3u && pragmaTokens[1] == "fragment") {
currentPass->fragmentEntryPoint = pragmaTokens[2].c_str();
continue;
}
if (pragmaTokens.size() >= 3u && pragmaTokens[1] == "target") {
currentPass->targetProfile = pragmaTokens[2].c_str();
continue;
}
if (pragmaTokens.size() >= 2u &&
(pragmaTokens[1] == "multi_compile" ||
pragmaTokens[1] == "multi_compile_local" ||
pragmaTokens[1] == "shader_feature" ||
pragmaTokens[1] == "shader_feature_local")) {
ShaderKeywordDeclaration declaration = {};
if (!TryParseShaderKeywordDeclarationPragma(pragmaTokens, declaration)) {
return fail("keyword pragma must declare at least one option", humanLine);
}
currentPass->keywordDeclarations.PushBack(declaration);
continue;
}
return fail("unsupported pragma in Unity-style single-source shader", humanLine);
}
if (line == "{") {
switch (pendingBlock) {
case BlockKind::Shader:
blockStack.push_back(BlockKind::Shader);
break;
case BlockKind::Properties:
blockStack.push_back(BlockKind::Properties);
break;
case BlockKind::SubShader:
outDesc.subShaders.emplace_back();
currentSubShader = &outDesc.subShaders.back();
blockStack.push_back(BlockKind::SubShader);
break;
case BlockKind::Pass:
if (currentSubShader == nullptr) {
return fail("pass block must be inside a SubShader", humanLine);
}
currentSubShader->passes.emplace_back();
currentPass = &currentSubShader->passes.back();
currentPass->hasFixedFunctionState = true;
currentPass->fixedFunctionState = BuildUnityDefaultFixedFunctionState();
if (currentSubShader->hasFixedFunctionState) {
currentPass->fixedFunctionState = currentSubShader->fixedFunctionState;
}
blockStack.push_back(BlockKind::Pass);
break;
case BlockKind::None:
default:
return fail("unexpected opening brace", humanLine);
}
pendingBlock = BlockKind::None;
continue;
}
if (line == "}") {
if (blockStack.empty()) {
return fail("unexpected closing brace", humanLine);
}
const BlockKind closingBlock = blockStack.back();
blockStack.pop_back();
if (closingBlock == BlockKind::Pass) {
currentPass = nullptr;
} else if (closingBlock == BlockKind::SubShader) {
currentSubShader = nullptr;
}
continue;
}
if (StartsWithKeyword(line, "Shader")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() < 2u) {
return fail("Shader declaration is missing a name", humanLine);
}
outDesc.name = tokens[1].c_str();
pendingBlock = BlockKind::Shader;
continue;
}
if (line == "Properties") {
pendingBlock = BlockKind::Properties;
continue;
}
if (currentBlock() == BlockKind::Shader && StartsWithKeyword(line, "Fallback")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() < 2u) {
return fail("Fallback directive is missing a value", humanLine);
}
outDesc.fallback = tokens[1].c_str();
continue;
}
if (StartsWithKeyword(line, "SubShader")) {
pendingBlock = BlockKind::SubShader;
continue;
}
if (StartsWithKeyword(line, "Pass")) {
pendingBlock = BlockKind::Pass;
continue;
}
if (line == "Resources" || StartsWithKeyword(line, "Resources")) {
return fail("Unity-style single-source shaders must not declare Resources blocks", humanLine);
}
if (StartsWithKeyword(line, "Tags")) {
std::vector<AuthoringTagEntry> parsedTags;
if (!TryParseInlineTagAssignments(line, parsedTags)) {
return fail("Tags block must use inline key/value pairs", humanLine);
}
if (currentPass != nullptr) {
currentPass->tags.insert(currentPass->tags.end(), parsedTags.begin(), parsedTags.end());
} else if (currentSubShader != nullptr) {
currentSubShader->tags.insert(currentSubShader->tags.end(), parsedTags.begin(), parsedTags.end());
} else {
return fail("Tags block is only supported inside SubShader or Pass", humanLine);
}
continue;
}
if (currentBlock() == BlockKind::Properties) {
ShaderPropertyDesc property = {};
if (!TryParseAuthoringPropertyLine(line, property)) {
return fail("invalid Properties entry", humanLine);
}
outDesc.properties.PushBack(property);
continue;
}
if (line == "HLSLINCLUDE" || line == "CGINCLUDE") {
if (currentPass != nullptr) {
return fail("HLSLINCLUDE is not supported inside a Pass block", humanLine);
}
Containers::String* destination = nullptr;
if (currentBlock() == BlockKind::Shader) {
destination = &outDesc.sharedProgramSource;
} else if (currentBlock() == BlockKind::SubShader && currentSubShader != nullptr) {
destination = &currentSubShader->sharedProgramSource;
} else {
return fail(
"HLSLINCLUDE is only supported directly inside Shader or SubShader in the new authoring mode",
humanLine);
}
inSharedIncludeBlock = true;
if (!consumeExtractedBlock(
ExtractedProgramBlock::Kind::SharedInclude,
*destination,
true,
humanLine)) {
return false;
}
continue;
}
if (currentBlock() == BlockKind::SubShader && StartsWithKeyword(line, "LOD")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() != 2u) {
return fail("LOD directive must provide a numeric value", humanLine);
}
try {
const Core::uint32 lodValue = static_cast<Core::uint32>(std::stoul(tokens[1]));
SetOrReplaceAuthoringTag(currentSubShader->tags, "LOD", std::to_string(lodValue).c_str());
} catch (...) {
return fail("LOD directive must provide a numeric value", humanLine);
}
continue;
}
if (currentBlock() == BlockKind::SubShader && currentSubShader != nullptr) {
if (StartsWithKeyword(line, "Cull")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() != 2u) {
return fail("Cull directive must use Front, Back, or Off", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentSubShader->hasFixedFunctionState,
currentSubShader->fixedFunctionState);
if (!TryParseUnityStyleCullMode(tokens[1], currentSubShader->fixedFunctionState.cullMode)) {
return fail("Cull directive must use Front, Back, or Off", humanLine);
}
continue;
}
if (StartsWithKeyword(line, "ZWrite")) {
std::vector<std::string> tokens;
bool enabled = false;
if (!TryTokenizeQuotedArguments(line, tokens) ||
tokens.size() != 2u ||
!TryParseUnityStyleBoolDirectiveToken(tokens[1], enabled)) {
return fail("ZWrite directive must use On or Off", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentSubShader->hasFixedFunctionState,
currentSubShader->fixedFunctionState);
currentSubShader->fixedFunctionState.depthWriteEnable = enabled;
continue;
}
if (StartsWithKeyword(line, "ZTest")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() != 2u) {
return fail("ZTest directive uses an unsupported compare function", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentSubShader->hasFixedFunctionState,
currentSubShader->fixedFunctionState);
if (!TryParseUnityStyleComparisonFunc(tokens[1], currentSubShader->fixedFunctionState.depthFunc)) {
return fail("ZTest directive uses an unsupported compare function", humanLine);
}
currentSubShader->fixedFunctionState.depthTestEnable = true;
continue;
}
if (StartsWithKeyword(line, "Blend")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens)) {
return fail("Blend directive could not be tokenized", humanLine);
}
for (size_t tokenIndex = 1; tokenIndex < tokens.size(); ++tokenIndex) {
if (!tokens[tokenIndex].empty() && tokens[tokenIndex].back() == ',') {
tokens[tokenIndex].pop_back();
}
}
EnsureAuthoringFixedFunctionStateInitialized(
currentSubShader->hasFixedFunctionState,
currentSubShader->fixedFunctionState);
if (!TryParseUnityStyleBlendDirective(tokens, currentSubShader->fixedFunctionState)) {
return fail("Blend directive uses an unsupported factor combination", humanLine);
}
continue;
}
if (StartsWithKeyword(line, "ColorMask")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) ||
(tokens.size() != 2u && tokens.size() != 3u)) {
return fail("ColorMask directive uses an unsupported channel mask", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentSubShader->hasFixedFunctionState,
currentSubShader->fixedFunctionState);
if (!TryParseUnityStyleColorMask(tokens[1], currentSubShader->fixedFunctionState.colorWriteMask)) {
return fail("ColorMask directive uses an unsupported channel mask", humanLine);
}
continue;
}
}
if (currentBlock() == BlockKind::Pass && currentPass != nullptr) {
if (StartsWithKeyword(line, "Name")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() < 2u) {
return fail("pass Name directive is missing a value", humanLine);
}
currentPass->name = tokens[1].c_str();
continue;
}
if (StartsWithKeyword(line, "Cull")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() != 2u) {
return fail("Cull directive must use Front, Back, or Off", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentPass->hasFixedFunctionState,
currentPass->fixedFunctionState);
if (!TryParseUnityStyleCullMode(tokens[1], currentPass->fixedFunctionState.cullMode)) {
return fail("Cull directive must use Front, Back, or Off", humanLine);
}
continue;
}
if (StartsWithKeyword(line, "ZWrite")) {
std::vector<std::string> tokens;
bool enabled = false;
if (!TryTokenizeQuotedArguments(line, tokens) ||
tokens.size() != 2u ||
!TryParseUnityStyleBoolDirectiveToken(tokens[1], enabled)) {
return fail("ZWrite directive must use On or Off", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentPass->hasFixedFunctionState,
currentPass->fixedFunctionState);
currentPass->fixedFunctionState.depthWriteEnable = enabled;
continue;
}
if (StartsWithKeyword(line, "ZTest")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) || tokens.size() != 2u) {
return fail("ZTest directive uses an unsupported compare function", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentPass->hasFixedFunctionState,
currentPass->fixedFunctionState);
if (!TryParseUnityStyleComparisonFunc(tokens[1], currentPass->fixedFunctionState.depthFunc)) {
return fail("ZTest directive uses an unsupported compare function", humanLine);
}
currentPass->fixedFunctionState.depthTestEnable = true;
continue;
}
if (StartsWithKeyword(line, "Blend")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens)) {
return fail("Blend directive could not be tokenized", humanLine);
}
for (size_t tokenIndex = 1; tokenIndex < tokens.size(); ++tokenIndex) {
if (!tokens[tokenIndex].empty() && tokens[tokenIndex].back() == ',') {
tokens[tokenIndex].pop_back();
}
}
EnsureAuthoringFixedFunctionStateInitialized(
currentPass->hasFixedFunctionState,
currentPass->fixedFunctionState);
if (!TryParseUnityStyleBlendDirective(tokens, currentPass->fixedFunctionState)) {
return fail("Blend directive uses an unsupported factor combination", humanLine);
}
continue;
}
if (StartsWithKeyword(line, "ColorMask")) {
std::vector<std::string> tokens;
if (!TryTokenizeQuotedArguments(line, tokens) ||
(tokens.size() != 2u && tokens.size() != 3u)) {
return fail("ColorMask directive uses an unsupported channel mask", humanLine);
}
EnsureAuthoringFixedFunctionStateInitialized(
currentPass->hasFixedFunctionState,
currentPass->fixedFunctionState);
if (!TryParseUnityStyleColorMask(tokens[1], currentPass->fixedFunctionState.colorWriteMask)) {
return fail("ColorMask directive uses an unsupported channel mask", humanLine);
}
continue;
}
if (line == "HLSLPROGRAM" || line == "CGPROGRAM") {
inProgramBlock = true;
if (!consumeExtractedBlock(
ExtractedProgramBlock::Kind::PassProgram,
currentPass->programSource,
false,
humanLine)) {
return false;
}
continue;
}
}
return fail("unsupported authoring statement: " + line, humanLine);
}
if (inSharedIncludeBlock || inProgramBlock) {
return fail("program block was not closed", lines.size());
}
if (!blockStack.empty()) {
return fail("one or more blocks were not closed", lines.size());
}
if (outDesc.name.Empty()) {
return fail("shader name is missing", 0);
}
if (outDesc.subShaders.empty()) {
return fail("shader does not declare any SubShader blocks", 0);
}
for (AuthoringSubShaderEntry& subShader : outDesc.subShaders) {
if (subShader.passes.empty()) {
continue;
}
for (AuthoringPassEntry& pass : subShader.passes) {
if (pass.name.Empty()) {
return fail("a Pass is missing a Name directive", 0);
}
if (pass.programSource.Empty()) {
return fail("a Pass is missing an HLSLPROGRAM block", 0);
}
if (pass.vertexEntryPoint.Empty()) {
return fail("a Pass is missing a #pragma vertex directive", 0);
}
if (pass.fragmentEntryPoint.Empty()) {
return fail("a Pass is missing a #pragma fragment directive", 0);
}
}
}
return true;
}
} // namespace Resources
} // namespace XCEngine
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