C++ TShHandleBase::getAsCompiler方法代码示例

void ShGetVariableInfo(const ShHandle handle,
                       ShShaderInfo varType,
                       int index,
                       size_t* length,
                       int* size,
                       ShDataType* type,
                       ShPrecisionType* precision,
                       int* staticUse,
                       char* name,
                       char* mappedName)
{
    if (!handle || !size || !type || !precision || !staticUse || !name)
        return;
    ASSERT((varType == SH_ACTIVE_ATTRIBUTES) ||
           (varType == SH_ACTIVE_UNIFORMS) ||
           (varType == SH_VARYINGS));

    TShHandleBase* base = reinterpret_cast<TShHandleBase*>(handle);
    TCompiler* compiler = base->getAsCompiler();
    if (compiler == 0)
        return;

    const TVariableInfoList& varList =
        varType == SH_ACTIVE_ATTRIBUTES ? compiler->getAttribs() :
            (varType == SH_ACTIVE_UNIFORMS ? compiler->getUniforms() :
                compiler->getVaryings());
    if (index < 0 || index >= static_cast<int>(varList.size()))
        return;

    const TVariableInfo& varInfo = varList[index];
    if (length) *length = varInfo.name.size();
    *size = varInfo.size;
    *type = varInfo.type;
    switch (varInfo.precision) {
    case EbpLow:
        *precision = SH_PRECISION_LOWP;
        break;
    case EbpMedium:
        *precision = SH_PRECISION_MEDIUMP;
        break;
    case EbpHigh:
        *precision = SH_PRECISION_HIGHP;
        break;
    default:
        // Some types does not support precision, for example, boolean.
        *precision = SH_PRECISION_UNDEFINED;
        break;
    }
    *staticUse = varInfo.staticUse ? 1 : 0;

    // This size must match that queried by
    // SH_ACTIVE_UNIFORM_MAX_LENGTH, SH_ACTIVE_ATTRIBUTE_MAX_LENGTH, SH_VARYING_MAX_LENGTH
    // in ShGetInfo, below.
    size_t variableLength = 1 + MAX_SYMBOL_NAME_LEN;
    ASSERT(checkVariableMaxLengths(handle, variableLength));
    strncpy(name, varInfo.name.c_str(), variableLength);
    name[variableLength - 1] = 0;
    if (mappedName) {
        // This size must match that queried by
        // SH_MAPPED_NAME_MAX_LENGTH in ShGetInfo, below.
        size_t maxMappedNameLength = 1 + MAX_SYMBOL_NAME_LEN;
        ASSERT(checkMappedNameMaxLength(handle, maxMappedNameLength));
        strncpy(mappedName, varInfo.mappedName.c_str(), maxMappedNameLength);
        mappedName[maxMappedNameLength - 1] = 0;
    }
}

//
// Do an actual compile on the given strings.  The result is left 
// in the given compile object.
//
// Return:  The return value of ShCompile is really boolean, indicating
// success or failure.
//
int ShCompile(
    const ShHandle handle,
    const char* const shaderStrings[],
    const int numStrings,
    const EShOptimizationLevel optLevel,
    const TBuiltInResource* resources,
    int debugOptions
    )
{
    if (!InitThread())
        return 0;

    if (handle == 0)
        return 0;

    TShHandleBase* base = reinterpret_cast<TShHandleBase*>(handle);
    TCompiler* compiler = base->getAsCompiler();
    if (compiler == 0)
        return 0;
    
    GlobalPoolAllocator.push();
    compiler->infoSink.info.erase();
    compiler->infoSink.debug.erase();

    if (numStrings == 0)
        return 1;

    TIntermediate intermediate(compiler->infoSink);
    TSymbolTable symbolTable(SymbolTables[compiler->getLanguage()]);
    
    generateBuiltInSymbolTable(resources, compiler->infoSink, &symbolTable, compiler->getLanguage());

    TParseContext parseContext(symbolTable, intermediate, compiler->getLanguage(), compiler->infoSink);
    parseContext.initializeExtensionBehavior();

    GlobalParseContext = &parseContext;
    
    setInitialState();

    InitPreprocessor();    
    //
    // Parse the application's shaders.  All the following symbol table
    // work will be throw-away, so push a new allocation scope that can
    // be thrown away, then push a scope for the current shader's globals.
    //
    bool success = true;
    
    symbolTable.push();
    if (!symbolTable.atGlobalLevel())
        parseContext.infoSink.info.message(EPrefixInternalError, "Wrong symbol table level");

    if (parseContext.insertBuiltInArrayAtGlobalLevel())
        success = false;

    int ret = PaParseStrings(const_cast<char**>(shaderStrings), 0, numStrings, parseContext);
    if (ret)
        success = false;

    if (success && parseContext.treeRoot) {
        if (optLevel == EShOptNoGeneration)
            parseContext.infoSink.info.message(EPrefixNone, "No errors.  No code generation or linking was requested.");
        else {
            success = intermediate.postProcess(parseContext.treeRoot, parseContext.language);

            if (success) {

                if (debugOptions & EDebugOpIntermediate)
                    intermediate.outputTree(parseContext.treeRoot);

                //
                // Call the machine dependent compiler
                //
                if (! compiler->compile(parseContext.treeRoot))
                    success = false;
            }
        }
    } else if (!success) {
        parseContext.infoSink.info.prefix(EPrefixError);
        parseContext.infoSink.info << parseContext.numErrors << " compilation errors.  No code generated.\n\n";
        success = false;
        if (debugOptions & EDebugOpIntermediate)
            intermediate.outputTree(parseContext.treeRoot);
    }

    intermediate.remove(parseContext.treeRoot);

    //
    // Ensure symbol table is returned to the built-in level,
    // throwing away all but the built-ins.
    //
    while (! symbolTable.atSharedBuiltInLevel())
        symbolTable.pop();

//.........这里部分代码省略.........