RedCore/cocos2d/cocos/platform/winrt/CCPrecompiledShaders.cpp

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#include "platform/winrt/CCPrecompiledShaders.h"
#include "platform/winrt/CCWinRTUtils.h"
#include "renderer/CCGLProgram.h"
#include "platform/winrt/sha1.h"

using namespace Windows::Graphics::Display;
using namespace Windows::Storage;
using namespace Platform;
using namespace Windows::Storage;
using namespace Windows::Storage::Pickers;
using namespace Windows::Storage::Streams;
using namespace concurrency;

NS_CC_BEGIN

// singleton stuff
static CCPrecompiledShaders *s_pPrecompiledShaders = nullptr;

#define SHADER_NAME_PREFIX "s_"


CCPrecompiledShaders* CCPrecompiledShaders::getInstance(void)
{
    if (!s_pPrecompiledShaders)
    {
        s_pPrecompiledShaders = new CCPrecompiledShaders();
    }

    return s_pPrecompiledShaders;
}

CCPrecompiledShaders::CCPrecompiledShaders(void) 
    : m_isDirty(false)
{
    Init();
}

void CCPrecompiledShaders::Init(void)
{
    m_programs.clear();
    m_precompiledPrograms.clear();

    // add existing precompiled programs to dictionary
    loadPrecompiledPrograms();
}

CCPrecompiledShaders::~CCPrecompiledShaders(void)
{
}

static std::string computeHash(const GLchar* vShaderByteArray, const GLchar* fShaderByteArray) 
{
    SHA1Context sha;
    int err;
    err = SHA1Reset(&sha);
    std::string result = "";
    uint8_t hash[SHA1HashSize];
    char hashString[SHA1HashSize * 2 + 1];

    if(!err)
    {
        err = SHA1Input(&sha,(const unsigned char *) vShaderByteArray,static_cast<unsigned int>(strlen(vShaderByteArray)));
    }
    if(!err)
    {
        err = SHA1Input(&sha,(const unsigned char *) fShaderByteArray, static_cast<unsigned int>(strlen(fShaderByteArray)));
    }
    if(!err)
    {
        char* shader_version = (char*) glGetString(GL_SHADING_LANGUAGE_VERSION);
        err = SHA1Input(&sha,(const unsigned char *) shader_version, static_cast<unsigned int>(strlen(shader_version)));
    }
    if(!err)
    {
        err = SHA1Result(&sha, hash);
    }
    if(!err)
    {
        SHA1ConvertMessageToString(hash, hashString);
        result = hashString;
    }

    return result;
}

std::string CCPrecompiledShaders::addShaders(const GLchar* vShaderByteArray, const GLchar* fShaderByteArray)
{
    return computeHash(vShaderByteArray, fShaderByteArray);
}


void CCPrecompiledShaders::loadPrecompiledPrograms()
{
    m_precompiledPrograms.clear();
#if defined(PRECOMPILED_SHADERS)
    for(int i = 0; i < s_numPrograms; i++)
    {
        PrecompiledProgram* p = new PrecompiledProgram();
        p->key = s_programKeys[i];
        p->program = s_programs[i];
        p->length = s_programLengths[i];
        m_precompiledPrograms[s_programKeys[i]] = p;
    }
#endif
}

void CCPrecompiledShaders::addPrecompiledProgram(const char* key, const unsigned char* program, int programLength)
{
    std::string id = key;
    PrecompiledProgram* p = nullptr;
    auto it = m_precompiledPrograms.find(id);
    if (it != m_precompiledPrograms.end())
    {
        p = it->second;
    }
    else
    {
        p = new PrecompiledProgram();
        m_precompiledPrograms[id] = p;
    }
    p->key = key;
    p->program = program;
    p->length = programLength;
}

bool CCPrecompiledShaders::loadProgram(GLuint program, const GLchar* vShaderByteArray, const GLchar* fShaderByteArray)
{
    std::string id = computeHash(vShaderByteArray, fShaderByteArray);

    auto it = m_precompiledPrograms.find(id);
    if(it == m_precompiledPrograms.end())
        return false;

    glProgramBinaryOES(program, GL_PROGRAM_BINARY_ANGLE, (const GLvoid*) it->second->program, it->second->length);

    return true;
}

bool CCPrecompiledShaders::addProgram(GLuint program, const std::string& id)
{
    int length;

    auto it = m_programs.find(id);
    if(it != m_programs.end())
        return true;

    auto it2 = m_precompiledPrograms.find(id);
    if(it2 == m_precompiledPrograms.end())
        m_isDirty = true;

    CompiledProgram* p = new CompiledProgram();

    glGetProgramiv(program, GL_PROGRAM_BINARY_LENGTH_OES, &length);
    p->program.reserve(length);
    p->length = length;
    p->key = id;
    GLenum binaryFormat;
    glGetProgramBinaryOES(program, length, NULL, &binaryFormat, p->program.data());
    m_programs[id] = p;

    return true;
}

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)

void CCPrecompiledShaders::savePrecompiledPrograms(Windows::Storage::StorageFolder^ folder)
{
    Platform::String ^fileName = L"precompiledshaders.h";

    auto saveTask = create_task(folder->CreateFileAsync(fileName, CreationCollisionOption::ReplaceExisting));

    saveTask.then([this](StorageFile^ file)
    {
        InMemoryRandomAccessStream^ memoryStream = ref new InMemoryRandomAccessStream(); 
        DataWriter^ dataWriter = ref new DataWriter(memoryStream); 

        Platform::String^ programLengths = "const int s_programLengths[] = {";
        Platform::String^ programs = "const unsigned char* s_programs[] = {";
        Platform::String^ programKeys = "const char* s_programKeys[] = {";

        int numPrograms = 0;

        dataWriter->WriteString(L"#define PRECOMPILED_SHADERS\n\n");


        for (auto& iter : m_programs)
        {
            CompiledProgram* p = (CompiledProgram*)iter.second;
            Platform::String^ keyName = PlatformStringFromString(p->key);
            Platform::String^ programName = SHADER_NAME_PREFIX + keyName;

            dataWriter->WriteString("const unsigned char ");
            dataWriter->WriteString(programName);
            dataWriter->WriteString("[] = {\n");

            char temp[32];
            unsigned char* buffer = p->program.data();

            for(int i = 0; i < p->length - 1; i++)
            {
                if(i % 8 == 0)
                    dataWriter->WriteString("\n");
                sprintf_s(temp, "%3i, ", buffer[i]);
                dataWriter->WriteString(PlatformStringFromString(temp));
            }
            if((p->length - 1) % 8 == 0)
                dataWriter->WriteString("\n");
            sprintf_s(temp, "%3i, ", buffer[p->length - 1]);
            dataWriter->WriteString(PlatformStringFromString(temp));
            dataWriter->WriteString("\n};\n\n");

            if(numPrograms != 0)
            {
                programLengths += (",");
                programs += (",");
                programKeys += (",");
            }
            programLengths += p->length;
            programs += programName;
            programKeys += "\"" + keyName + "\"";
            numPrograms++;
        }

        programLengths += "};\n";
        programs += "};\n";
        programKeys += "};\n";

        Platform::String^ n = ref new Platform::String(L"const int s_numPrograms = ");
        n += numPrograms;
        n += ";\n";

        dataWriter->WriteString(n);
        dataWriter->WriteString(programLengths);
        dataWriter->WriteString(programs);
        dataWriter->WriteString(programKeys);

        return FileIO::WriteBufferAsync(file, dataWriter->DetachBuffer());
   });  

}

void CCPrecompiledShaders::savePrecompiledShaders()
{
    if(!m_isDirty)
        return;


    FolderPicker^ folderPicker = ref new FolderPicker();
    folderPicker->SuggestedStartLocation = PickerLocationId::Desktop;
    folderPicker->FileTypeFilter->Append(".h");

    auto saveTask = create_task(folderPicker->PickSingleFolderAsync());
    saveTask.then([this](StorageFolder^ folder)
    {
        if(folder != nullptr)
        {
            savePrecompiledPrograms(folder);
            m_isDirty = false;
       }
	});
}
#endif



NS_CC_END