ShaderLang.cpp

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Author : zmo@google.com
Date : 2011-04-23 01:30:07
Hash : fd747b86
Message : Implement shader identifier name mapping. The name mapping happens when an identifier is longer than 32 characters. The name mapping is behind a flag, so it won't happen by default. Also, functions to query the mapped names are added. The purpose of this CL is for the drivers that can't handle long names. For example, linux NVIDIA driver can't handle 256 character name, whereas WebGL spec requires that. This CL also fixes the issue that some of the TIntermSymbols' ids are 0s. ANGLEBUG=144 TEST=test manually with shaders with long identifier names. Review URL: http://codereview.appspot.com/4428058 git-svn-id: https://angleproject.googlecode.com/svn/trunk@619 736b8ea6-26fd-11df-bfd4-992fa37f6226

src/compiler/ShaderLang.cpp

//
// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

//
// Implement the top-level of interface to the compiler,
// as defined in ShaderLang.h
//

#include "GLSLANG/ShaderLang.h"

#include "compiler/InitializeDll.h"
#include "compiler/ShHandle.h"

//
// This is the platform independent interface between an OGL driver
// and the shading language compiler.
//

static int getVariableMaxLength(const TVariableInfoList& varList)
{
    TString::size_type maxLen = 0;
    for (TVariableInfoList::const_iterator i = varList.begin();
         i != varList.end(); ++i)
    {
        maxLen = std::max(maxLen, i->name.size());
    }
    // Add 1 to include null-termination character.
    return static_cast<int>(maxLen) + 1;
}

static void getVariableInfo(ShShaderInfo varType,
                            const ShHandle handle,
                            int index,
                            int* length,
                            int* size,
                            ShDataType* type,
                            char* name,
                            char* mappedName)
{
    if (!handle || !size || !type || !name)
        return;
    ASSERT((varType == SH_ACTIVE_ATTRIBUTES) ||
           (varType == SH_ACTIVE_UNIFORMS));

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

    const TVariableInfoList& varList = varType == SH_ACTIVE_ATTRIBUTES ?
        compiler->getAttribs() : compiler->getUniforms();
    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;
    strcpy(name, varInfo.name.c_str());
    if (mappedName)
        strcpy(mappedName, varInfo.mappedName.c_str());
}

//
// Driver must call this first, once, before doing any other
// compiler operations.
//
int ShInitialize()
{
    if (!InitProcess())
        return 0;

    return 1;
}

//
// Cleanup symbol tables
//
int ShFinalize()
{
    if (!DetachProcess())
        return 0;

    return 1;
}

//
// Initialize built-in resources with minimum expected values.
//
void ShInitBuiltInResources(ShBuiltInResources* resources)
{
    // Constants.
    resources->MaxVertexAttribs = 8;
    resources->MaxVertexUniformVectors = 128;
    resources->MaxVaryingVectors = 8;
    resources->MaxVertexTextureImageUnits = 0;
    resources->MaxCombinedTextureImageUnits = 8;
    resources->MaxTextureImageUnits = 8;
    resources->MaxFragmentUniformVectors = 16;
    resources->MaxDrawBuffers = 1;

    // Extensions.
    resources->OES_standard_derivatives = 0;
}

//
// Driver calls these to create and destroy compiler objects.
//
ShHandle ShConstructCompiler(ShShaderType type, ShShaderSpec spec,
                             const ShBuiltInResources* resources)
{
    if (!InitThread())
        return 0;

    TShHandleBase* base = static_cast<TShHandleBase*>(ConstructCompiler(type, spec));
    TCompiler* compiler = base->getAsCompiler();
    if (compiler == 0)
        return 0;

    // Generate built-in symbol table.
    if (!compiler->Init(*resources)) {
        ShDestruct(base);
        return 0;
    }

    return reinterpret_cast<void*>(base);
}

void ShDestruct(ShHandle handle)
{
    if (handle == 0)
        return;

    TShHandleBase* base = static_cast<TShHandleBase*>(handle);

    if (base->getAsCompiler())
        DeleteCompiler(base->getAsCompiler());
}

//
// 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,
    int compileOptions)
{
    if (!InitThread())
        return 0;

    if (handle == 0)
        return 0;

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

    bool success = compiler->compile(shaderStrings, numStrings, compileOptions);
    return success ? 1 : 0;
}

void ShGetInfo(const ShHandle handle, ShShaderInfo pname, int* params)
{
    if (!handle || !params)
        return;

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

    switch(pname)
    {
    case SH_INFO_LOG_LENGTH:
        *params = compiler->getInfoSink().info.size() + 1;
        break;
    case SH_OBJECT_CODE_LENGTH:
        *params = compiler->getInfoSink().obj.size() + 1;
        break;
    case SH_ACTIVE_UNIFORMS:
        *params = compiler->getUniforms().size();
        break;
    case SH_ACTIVE_UNIFORM_MAX_LENGTH:
        *params = getVariableMaxLength(compiler->getUniforms());
        break;
    case SH_ACTIVE_ATTRIBUTES:
        *params = compiler->getAttribs().size();
        break;
    case SH_ACTIVE_ATTRIBUTE_MAX_LENGTH:
        *params = getVariableMaxLength(compiler->getAttribs());
        break;
    case SH_MAPPED_NAME_MAX_LENGTH:
        *params = compiler->getMappedNameMaxLength();
        break;
    default: UNREACHABLE();
    }
}

//
// Return any compiler log of messages for the application.
//
void ShGetInfoLog(const ShHandle handle, char* infoLog)
{
    if (!handle || !infoLog)
        return;

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

    TInfoSink& infoSink = compiler->getInfoSink();
    strcpy(infoLog, infoSink.info.c_str());
}

//
// Return any object code.
//
void ShGetObjectCode(const ShHandle handle, char* objCode)
{
    if (!handle || !objCode)
        return;

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

    TInfoSink& infoSink = compiler->getInfoSink();
    strcpy(objCode, infoSink.obj.c_str());
}

void ShGetActiveAttrib(const ShHandle handle,
                       int index,
                       int* length,
                       int* size,
                       ShDataType* type,
                       char* name,
                       char* mappedName)
{
    getVariableInfo(SH_ACTIVE_ATTRIBUTES,
                    handle, index, length, size, type, name, mappedName);
}

void ShGetActiveUniform(const ShHandle handle,
                        int index,
                        int* length,
                        int* size,
                        ShDataType* type,
                        char* name,
                        char* mappedName)
{
    getVariableInfo(SH_ACTIVE_UNIFORMS,
                    handle, index, length, size, type, name, mappedName);
}

kc3-lang/angle/src/compiler/ShaderLang.cpp

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kc3-lang/angle /src/compiler/ShaderLang.cpp