diff --git a/rsg_generator.c b/rsg_generator.c
new file mode 100644
index 0000000..a4d659d
--- /dev/null
+++ b/rsg_generator.c
@@ -0,0 +1,291 @@
+
+
+#include "lex.yy.c"
+
+void printFileHeader(FILE *f)
+{
+    fprintf(f, "/*\n");
+    fprintf(f, " * Copyright (C) 2009 The Android Open Source Project\n");
+    fprintf(f, " *\n");
+    fprintf(f, " * Licensed under the Apache License, Version 2.0 (the \"License\");\n");
+    fprintf(f, " * you may not use this file except in compliance with the License.\n");
+    fprintf(f, " * You may obtain a copy of the License at\n");
+    fprintf(f, " *\n");
+    fprintf(f, " *      http://www.apache.org/licenses/LICENSE-2.0\n");
+    fprintf(f, " *\n");
+    fprintf(f, " * Unless required by applicable law or agreed to in writing, software\n");
+    fprintf(f, " * distributed under the License is distributed on an \"AS IS\" BASIS,\n");
+    fprintf(f, " * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n");
+    fprintf(f, " * See the License for the specific language governing permissions and\n");
+    fprintf(f, " * limitations under the License.\n");
+    fprintf(f, " */\n\n");
+}
+
+void printVarType(FILE *f, const VarType *vt)
+{
+    int ct;
+    if (vt->isConst) {
+        fprintf(f, "const ");
+    }
+
+    switch(vt->type) {
+    case 0:
+        fprintf(f, "void");
+        break;
+    case 1:
+        fprintf(f, "int%i_t", vt->bits);
+        break;
+    case 2:
+        fprintf(f, "uint%i_t", vt->bits);
+        break;
+    case 3:
+        if (vt->bits == 32)
+            fprintf(f, "float");
+        else
+            fprintf(f, "double");
+        break;
+    case 4:
+        fprintf(f, "%s", vt->typename);
+        break;
+    }
+
+    if(vt->ptrLevel) {
+        fprintf(f, " ");
+        for(ct=0; ct < vt->ptrLevel; ct++) {
+            fprintf(f, "*");
+        }
+    }
+
+    if(vt->name[0]) {
+        fprintf(f, " %s", vt->name);
+    }
+}
+
+void printArgList(FILE *f, const ApiEntry * api, int assumePrevious)
+{
+    int ct;
+    for(ct=0; ct < api->paramCount; ct++) {
+        if (ct || assumePrevious) {
+            fprintf(f, ", ");
+        }
+        printVarType(f, &api->params[ct]);
+    }
+}
+
+void printStructures(FILE *f)
+{
+    int ct;
+    int ct2;
+
+    for(ct=0; ct < apiCount; ct++) {
+        fprintf(f, "typedef struct RS_CMD_%s_rec RS_CMD_%s;\n", apis[ct].name, apis[ct].name);
+    }
+    fprintf(f, "\n");
+
+    for(ct=0; ct < apiCount; ct++) {
+        const ApiEntry * api = &apis[ct];
+        fprintf(f, "#define RS_CMD_ID_%s %i\n", api->name, ct+1);
+        fprintf(f, "struct RS_CMD_%s_rec {\n", api->name);
+        //fprintf(f, "    RsCommandHeader _hdr;\n");
+
+        for(ct2=0; ct2 < api->paramCount; ct2++) {
+            fprintf(f, "    ");
+            printVarType(f, &api->params[ct2]);
+            fprintf(f, ";\n");
+        }
+        fprintf(f, "};\n\n");
+    }
+}
+
+void printFuncDecl(FILE *f, const ApiEntry *api, const char *prefix, int addContext)
+{
+    printVarType(f, &api->ret);
+    fprintf(f, " %s%s (", prefix, api->name);
+    if (addContext) {
+        fprintf(f, "Context *");
+    }
+    printArgList(f, api, addContext);
+    fprintf(f, ")");
+}
+
+void printFuncDecls(FILE *f, const char *prefix, int addContext)
+{
+    int ct;
+    for(ct=0; ct < apiCount; ct++) {
+        printFuncDecl(f, &apis[ct], prefix, addContext);
+        fprintf(f, ";\n");
+    }
+    fprintf(f, "\n\n");
+}
+
+void printPlaybackFuncs(FILE *f, const char *prefix)
+{
+    int ct;
+    for(ct=0; ct < apiCount; ct++) {
+        fprintf(f, "void %s%s (Context *, const void *);\n", prefix, apis[ct].name);
+    }
+}
+
+void printApiCpp(FILE *f)
+{
+    int ct;
+    int ct2;
+
+    fprintf(f, "#include \"rsDevice.h\"\n");
+    fprintf(f, "#include \"rsContext.h\"\n");
+    fprintf(f, "#include \"rsThreadIO.h\"\n");
+    //fprintf(f, "#include \"rsgApiStructs.h\"\n");
+    fprintf(f, "#include \"rsgApiFuncDecl.h\"\n");
+    fprintf(f, "\n");
+    fprintf(f, "using namespace android;\n");
+    fprintf(f, "using namespace android::renderscript;\n");
+    fprintf(f, "\n");
+
+    for(ct=0; ct < apiCount; ct++) {
+        int needFlush = 0;
+        const ApiEntry * api = &apis[ct];
+
+        printFuncDecl(f, api, "rs", 0);
+        fprintf(f, "\n{\n");
+        fprintf(f, "    ThreadIO *io = gIO;\n");
+        //fprintf(f, "    LOGE(\"add command %s\\n\");\n", api->name);
+        fprintf(f, "    RS_CMD_%s *cmd = static_cast<RS_CMD_%s *>(io->mToCore.reserve(sizeof(RS_CMD_%s)));\n", api->name, api->name, api->name);
+        fprintf(f, "    uint32_t size = sizeof(RS_CMD_%s);\n", api->name);
+
+        for(ct2=0; ct2 < api->paramCount; ct2++) {
+            const VarType *vt = &api->params[ct2];
+            needFlush += vt->ptrLevel;
+            fprintf(f, "    cmd->%s = %s;\n", vt->name, vt->name);
+        }
+        if (api->ret.typename[0]) {
+            needFlush = 1;
+        }
+
+        fprintf(f, "    io->mToCore.commit");
+        if (needFlush) {
+            fprintf(f, "Sync");
+        }
+        fprintf(f, "(RS_CMD_ID_%s, size);\n", api->name);
+
+        if (api->ret.typename[0]) {
+            fprintf(f, "    return reinterpret_cast<");
+            printVarType(f, &api->ret);
+            fprintf(f, ">(io->mToCoreRet);\n");
+        }
+        fprintf(f, "};\n\n");
+    }
+}
+
+void printPlaybackCpp(FILE *f)
+{
+    int ct;
+    int ct2;
+
+    fprintf(f, "#include \"rsDevice.h\"\n");
+    fprintf(f, "#include \"rsContext.h\"\n");
+    fprintf(f, "#include \"rsThreadIO.h\"\n");
+    //fprintf(f, "#include \"rsgApiStructs.h\"\n");
+    fprintf(f, "#include \"rsgApiFuncDecl.h\"\n");
+    fprintf(f, "\n");
+    fprintf(f, "namespace android {\n");
+    fprintf(f, "namespace renderscript {\n");
+    fprintf(f, "\n");
+
+    for(ct=0; ct < apiCount; ct++) {
+        const ApiEntry * api = &apis[ct];
+
+        fprintf(f, "void rsp_%s(Context *con, const void *vp)\n", api->name);
+        fprintf(f, "{\n");
+        //fprintf(f, "    LOGE(\"play command %s\\n\");\n", api->name);
+        fprintf(f, "    const RS_CMD_%s *cmd = static_cast<const RS_CMD_%s *>(vp);\n", api->name, api->name);
+        fprintf(f, "    ");
+        if (api->ret.typename[0]) {
+            fprintf(f, "gIO->mToCoreRet = (intptr_t)");
+        }
+        fprintf(f, "rsi_%s(con", api->name);
+        for(ct2=0; ct2 < api->paramCount; ct2++) {
+            const VarType *vt = &api->params[ct2];
+            fprintf(f, ",");
+            fprintf(f, "\n           cmd->%s", vt->name);
+        }
+        fprintf(f, ");\n");
+
+        fprintf(f, "};\n\n");
+    }
+
+    fprintf(f, "RsPlaybackFunc gPlaybackFuncs[] = {\n");
+    fprintf(f, "    NULL,\n");
+    for(ct=0; ct < apiCount; ct++) {
+        fprintf(f, "    %s%s,\n", "rsp_", apis[ct].name);
+    }
+    fprintf(f, "};\n");
+
+    fprintf(f, "};\n");
+    fprintf(f, "};\n");
+}
+
+int main(int argc, char **argv)
+{
+    if (argc != 3) {
+        fprintf(stderr, "usage: %s commandFile outFile\n", argv[0]);
+        return 1;
+    }
+    const char* rsgFile = argv[1];
+    const char* outFile = argv[2];
+    FILE* input = fopen(rsgFile, "r");
+
+    char choice = fgetc(input);
+    fclose(input);
+
+    if (choice < '0' || choice > '3') {
+        fprintf(stderr, "Uknown command: \'%c\'\n", choice);
+        return -2;
+    }
+
+    yylex();
+    // printf("# of lines = %d\n", num_lines);
+
+    FILE *f = fopen(outFile, "w");
+
+    printFileHeader(f);
+    switch(choice) {
+        case '0': // rsgApiStructs.h
+        {
+            fprintf(f, "\n");
+            fprintf(f, "#include \"rsContext.h\"\n");
+            fprintf(f, "\n");
+            fprintf(f, "namespace android {\n");
+            fprintf(f, "namespace renderscript {\n");
+            printStructures(f);
+            printFuncDecls(f, "rsi_", 1);
+            printPlaybackFuncs(f, "rsp_");
+            fprintf(f, "\n\ntypedef void (*RsPlaybackFunc)(Context *, const void *);\n");
+            fprintf(f, "extern RsPlaybackFunc gPlaybackFuncs[];\n");
+
+            fprintf(f, "}\n");
+            fprintf(f, "}\n");
+        }
+        break;
+
+        case '1': // rsgApiFuncDecl.h
+        {
+            printFuncDecls(f, "rs", 0);
+        }
+        break;
+
+        case '2': // rsgApi.cpp
+        {
+            printApiCpp(f);
+        }
+        break;
+
+        case '3': // rsgApiReplay.cpp
+        {
+            printFileHeader(f);
+            printPlaybackCpp(f);
+        }
+        break;
+    }
+    fclose(f);
+    return 0;
+}