ShaderLang.cpp

Branch :
Show log
Commit
Author : kbr@chromium.org
Date : 2011-10-26 01:18:28
Hash : 22152117
Message : Limit copied uniform and vertex attribute names to the implicit size of the buffers passed in. Increase the size of the buffer the client will allocate for mapped names to be equal to the maximum token length. BUG=http://code.google.com/p/angleproject/issues/detail?id=234 TEST=WebGL conformance test to be checked in soon Review URL: http://codereview.appspot.com/5306063 git-svn-id: https://angleproject.googlecode.com/svn/trunk@804 736b8ea6-26fd-11df-bfd4-992fa37f6226
src/compiler/ShaderLang.cpp
//
// Copyright (c) 2002-2011 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/preprocessor/length_limits.h"
#include "compiler/ShHandle.h"

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

static bool checkActiveUniformAndAttribMaxLengths(const ShHandle handle,
                                                  int expectedValue)
{
    int activeUniformLimit = 0;
    ShGetInfo(handle, SH_ACTIVE_UNIFORM_MAX_LENGTH, &activeUniformLimit);
    int activeAttribLimit = 0;
    ShGetInfo(handle, SH_ACTIVE_ATTRIBUTE_MAX_LENGTH, &activeAttribLimit);
    return (expectedValue == activeUniformLimit && expectedValue == activeAttribLimit);
}

static bool checkMappedNameMaxLength(const ShHandle handle, int expectedValue)
{
    int mappedNameMaxLength = 0;
    ShGetInfo(handle, SH_MAPPED_NAME_MAX_LENGTH, &mappedNameMaxLength);
    return (expectedValue == mappedNameMaxLength);
}

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;

    // This size must match that queried by
    // SH_ACTIVE_UNIFORM_MAX_LENGTH and SH_ACTIVE_ATTRIBUTE_MAX_LENGTH
    // in ShGetInfo, below.
    int activeUniformAndAttribLength = 1 + MAX_SYMBOL_NAME_LEN;
    ASSERT(checkActiveUniformAndAttribMaxLengths(handle, activeUniformAndAttribLength));
    strncpy(name, varInfo.name.c_str(), activeUniformAndAttribLength);
    if (mappedName) {
        // This size must match that queried by
        // SH_MAPPED_NAME_MAX_LENGTH in ShGetInfo, below.
        int maxMappedNameLength = 1 + MAX_SYMBOL_NAME_LEN;
        ASSERT(checkMappedNameMaxLength(handle, maxMappedNameLength));
        strncpy(mappedName, varInfo.mappedName.c_str(), maxMappedNameLength);
    }
}

//
// 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;
    resources->OES_EGL_image_external = 0;
}

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

    TShHandleBase* base = static_cast<TShHandleBase*>(ConstructCompiler(type, spec, output));
    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 = 1 +  MAX_SYMBOL_NAME_LEN;
        break;
    case SH_ACTIVE_ATTRIBUTES:
        *params = compiler->getAttribs().size();
        break;
    case SH_ACTIVE_ATTRIBUTE_MAX_LENGTH:
        *params = 1 + MAX_SYMBOL_NAME_LEN;
        break;
    case SH_MAPPED_NAME_MAX_LENGTH:
        // Use longer length than MAX_SHORTENED_IDENTIFIER_SIZE to
        // handle array and struct dereferences.
        *params = 1 + MAX_SYMBOL_NAME_LEN;
        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

Commit

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