/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "rsContext.h"
#include "rsScriptC.h"
#include "rsMatrix.h"

#include "acc/acc.h"
#include "utils/String8.h"

#include <GLES/gl.h>
#include <GLES/glext.h>

using namespace android;
using namespace android::renderscript;

#define GET_TLS()  Context::ScriptTLSStruct * tls = \
    (Context::ScriptTLSStruct *)pthread_getspecific(Context::gThreadTLSKey); \
    Context * rsc = tls->mContext; \
    ScriptC * sc = (ScriptC *) tls->mScript


ScriptC::ScriptC()
{
    mAccScript = NULL;
    memset(&mProgram, 0, sizeof(mProgram));
}

ScriptC::~ScriptC()
{
    if (mAccScript) {
        accDeleteScript(mAccScript);
    }
}


bool ScriptC::run(Context *rsc, uint32_t launchIndex)
{
    Context::ScriptTLSStruct * tls =
    (Context::ScriptTLSStruct *)pthread_getspecific(Context::gThreadTLSKey);

    if (mEnviroment.mFragmentStore.get()) {
        rsc->setFragmentStore(mEnviroment.mFragmentStore.get());
    }
    if (mEnviroment.mFragment.get()) {
        rsc->setFragment(mEnviroment.mFragment.get());
    }
    if (mEnviroment.mVertex.get()) {
        rsc->setVertex(mEnviroment.mVertex.get());
    }

    bool ret = false;
    tls->mScript = this;
    ret = mProgram.mScript(launchIndex) != 0;
    tls->mScript = NULL;
    return ret;
}

ScriptCState::ScriptCState()
{
    clear();
}

ScriptCState::~ScriptCState()
{
    if (mAccScript) {
        accDeleteScript(mAccScript);
    }
}

void ScriptCState::clear()
{
    memset(&mProgram, 0, sizeof(mProgram));

    mConstantBufferTypes.clear();

    memset(&mEnviroment, 0, sizeof(mEnviroment));
    mEnviroment.mClearColor[0] = 0;
    mEnviroment.mClearColor[1] = 0;
    mEnviroment.mClearColor[2] = 0;
    mEnviroment.mClearColor[3] = 1;
    mEnviroment.mClearDepth = 1;
    mEnviroment.mClearStencil = 0;
    mEnviroment.mIsRoot = false;

    mAccScript = NULL;

}

static ACCvoid* symbolLookup(ACCvoid* pContext, const ACCchar* name)
{
    const ScriptCState::SymbolTable_t *sym = ScriptCState::lookupSymbol(name);
    if (sym) {
        return sym->mPtr;
    }
    LOGE("ScriptC sym lookup failed for %s", name);
    return NULL;
}

void ScriptCState::runCompiler(Context *rsc)
{
    mAccScript = accCreateScript();
    String8 tmp;

    rsc->appendNameDefines(&tmp);
    appendDecls(&tmp);
    tmp.append("#line 1\n");

    const char* scriptSource[] = {tmp.string(), mProgram.mScriptText};
    int scriptLength[] = {tmp.length(), mProgram.mScriptTextLength} ;
    accScriptSource(mAccScript, sizeof(scriptLength) / sizeof(int), scriptSource, scriptLength);
    accRegisterSymbolCallback(mAccScript, symbolLookup, NULL);
    accCompileScript(mAccScript);
    accGetScriptLabel(mAccScript, "main", (ACCvoid**) &mProgram.mScript);
    rsAssert(mProgram.mScript);

    if (!mProgram.mScript) {
        ACCchar buf[4096];
        ACCsizei len;
        accGetScriptInfoLog(mAccScript, sizeof(buf), &len, buf);
        LOGE(buf);

    }

    mEnviroment.mFragment.set(rsc->getDefaultProgramFragment());
    mEnviroment.mVertex.set(rsc->getDefaultProgramVertex());
    mEnviroment.mFragmentStore.set(rsc->getDefaultProgramFragmentStore());

    if (mProgram.mScript) {
        const static int pragmaMax = 16;
        ACCsizei pragmaCount;
        ACCchar * str[pragmaMax];
        accGetPragmas(mAccScript, &pragmaCount, pragmaMax, &str[0]);

        for (int ct=0; ct < pragmaCount; ct+=2) {
            if (!strcmp(str[ct], "version")) {
                continue;
            }

            if (!strcmp(str[ct], "stateVertex")) {
                if (!strcmp(str[ct+1], "default")) {
                    continue;
                }
                if (!strcmp(str[ct+1], "parent")) {
                    mEnviroment.mVertex.clear();
                    continue;
                }
                ProgramVertex * pv = (ProgramVertex *)rsc->lookupName(str[ct+1]);
                if (pv != NULL) {
                    mEnviroment.mVertex.set(pv);
                    continue;
                }
                LOGE("Unreconized value %s passed to stateVertex", str[ct+1]);
            }

            if (!strcmp(str[ct], "stateRaster")) {
                LOGE("Unreconized value %s passed to stateRaster", str[ct+1]);
            }

            if (!strcmp(str[ct], "stateFragment")) {
                if (!strcmp(str[ct+1], "default")) {
                    continue;
                }
                if (!strcmp(str[ct+1], "parent")) {
                    mEnviroment.mFragment.clear();
                    continue;
                }
                ProgramFragment * pf = (ProgramFragment *)rsc->lookupName(str[ct+1]);
                if (pf != NULL) {
                    mEnviroment.mFragment.set(pf);
                    continue;
                }
                LOGE("Unreconized value %s passed to stateFragment", str[ct+1]);
            }

            if (!strcmp(str[ct], "stateFragmentStore")) {
                if (!strcmp(str[ct+1], "default")) {
                    continue;
                }
                if (!strcmp(str[ct+1], "parent")) {
                    mEnviroment.mFragmentStore.clear();
                    continue;
                }
                ProgramFragmentStore * pfs =
                    (ProgramFragmentStore *)rsc->lookupName(str[ct+1]);
                if (pfs != NULL) {
                    mEnviroment.mFragmentStore.set(pfs);
                    continue;
                }
                LOGE("Unreconized value %s passed to stateFragmentStore", str[ct+1]);
            }

        }


    } else {
        // Deal with an error.
    }

}

namespace android {
namespace renderscript {

void rsi_ScriptCBegin(Context * rsc)
{
    ScriptCState *ss = &rsc->mScriptC;
    ss->clear();
}

void rsi_ScriptCAddType(Context * rsc, RsType vt)
{
    ScriptCState *ss = &rsc->mScriptC;
    ss->mConstantBufferTypes.add(static_cast<const Type *>(vt));
}

void rsi_ScriptCSetScript(Context * rsc, void *vp)
{
    ScriptCState *ss = &rsc->mScriptC;
    ss->mProgram.mScript = reinterpret_cast<ScriptC::RunScript_t>(vp);
}

void rsi_ScriptCSetRoot(Context * rsc, bool isRoot)
{
    ScriptCState *ss = &rsc->mScriptC;
    ss->mEnviroment.mIsRoot = isRoot;
}

void rsi_ScriptCSetText(Context *rsc, const char *text, uint32_t len)
{
    ScriptCState *ss = &rsc->mScriptC;
    ss->mProgram.mScriptText = text;
    ss->mProgram.mScriptTextLength = len;
}


RsScript rsi_ScriptCCreate(Context * rsc)
{
    ScriptCState *ss = &rsc->mScriptC;

    ss->runCompiler(rsc);

    ScriptC *s = new ScriptC();
    s->incRef();
    s->mAccScript = ss->mAccScript;
    ss->mAccScript = NULL;
    s->mEnviroment = ss->mEnviroment;
    s->mProgram = ss->mProgram;
    ss->clear();

    return s;
}

}
}