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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
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package com.sun.gluegen.runtime.opengl;

import java.util.*;
import com.sun.gluegen.runtime.*;

public class GLExtensionNames {
    //GL_XYZ : GL_XYZ, GL_XYZ_GL2, GL_XYZ_ARB, GL_XYZ_OES, GL_XYZ_OML
    //GL_XYZ : GL_XYZ, GL_GL2_XYZ, GL_ARB_XYZ, GL_OES_XYZ, GL_OML_XYZ
    //
    // Pass-1 Unify ARB extensions with the same value
    // Pass-2 Unify vendor extensions, 
    //        if exist as an ARB extension with the same value.
    // Pass-3 Emit

    public static final String[] extensionsARB = { "ARB", "GL2", "OES", "KHR", "OML" };
    public static final String[] extensionsVEN = { "3DFX", 
                                                   "AMD",
                                                   "APPLE",
                                                   "ATI",
                                                   "EXT",
                                                   "HP",
                                                   "IBM",
                                                   "MESA",
                                                   "MESAX",
                                                   "NV",
                                                   "SGI",
                                                   "SGIS",
                                                   "SGIX",
                                                   "SUN",
                                                   "WIN"
                                                   };


    public static final boolean isGLFunction(String str) {
        return str.startsWith("gl")  || /* str.startsWith("glu") || str.startsWith("glX") || */
               str.startsWith("egl") || str.startsWith("wgl") || str.startsWith("agl") ||
               str.startsWith("cgl") ;
    }

    public static final boolean isGLEnumeration(String str) {
        return str.startsWith("GL_")  || str.startsWith("GLU_") || str.startsWith("GLX_") ||
               str.startsWith("EGL_") || str.startsWith("WGL_") || str.startsWith("AGL_") ||
               str.startsWith("CGL_") ;
    }

    public static final int getExtensionIdx(String[] extensions, String str, boolean isGLFunc) {
        if(isGLFunc) {
            for(int i = extensions.length - 1 ; i>=0 ; i--) {
                if( str.endsWith(extensions[i]) ) {
                    return i;
                }
            }
        } else {
            for(int i = extensions.length - 1 ; i>=0 ; i--) {
                if( str.endsWith("_"+extensions[i]) ) {
                    return i;
                }
            }
        }
        return -1;
    }

    public static final boolean isExtension(String[] extensions, String str, boolean isGLFunc) {
        return getExtensionIdx(extensions, str, isGLFunc)>=0;
    }

    public static final String getExtensionSuffix(String str, boolean isGLFunc) {
        int idx = getExtensionIdx(extensionsARB, str, isGLFunc);
        if(idx>=0) {
            return extensionsARB[idx];
        }
        idx = getExtensionIdx(extensionsVEN, str, isGLFunc);
        if(idx>=0) {
            return extensionsVEN[idx];
        }
        return null;
    }

    public static final String normalize(String[] extensions, String str, boolean isGLFunc) {
        boolean touched = false;
        for(int i = extensions.length - 1 ; !touched && i>=0 ; i--) {
            if(isGLFunc) {
                if(str.endsWith(extensions[i])) {
                    // functions
                    str = str.substring(0, str.length()-extensions[i].length());
                    touched=true;
                }
            } else {
                if(str.endsWith("_"+extensions[i])) {
                    // enums
                    str = str.substring(0, str.length()-1-extensions[i].length());
                    touched=true;
                }
            }
        }
        return str;
    }
    public static final String normalizeARB(String str, boolean isGLFunc) {
        return normalize(extensionsARB, str, isGLFunc);
    }
    public static final boolean isExtensionARB(String str, boolean isGLFunc) {
        return isExtension(extensionsARB, str, isGLFunc);
    }
    public static final String normalizeVEN(String str, boolean isGLFunc) {
        return normalize(extensionsVEN, str, isGLFunc);
    }
    public static final boolean isExtensionVEN(String str, boolean isGLFunc) {
        return isExtension(extensionsVEN, str, isGLFunc);
    }
    public static final String normalize(String str, boolean isGLFunc) {
        if (isExtensionARB(str, isGLFunc)) {
            return normalizeARB(str, isGLFunc);
        }
        if (isExtensionVEN(str, isGLFunc)) {
            return normalizeVEN(str, isGLFunc);
        }
        return str;
    }
    public static final boolean isExtension(String str, boolean isGLFunc) {
        return isExtension(extensionsARB, str, isGLFunc) || 
               isExtension(extensionsVEN, str, isGLFunc);
    }

    public static final int getFuncNamePermutationNumber(String name) {
        if(isExtensionARB(name, true) || isExtensionVEN(name, true)) {
            // no name permutation, if it's already a known extension
            return 1;
        }
        return 1 + extensionsARB.length + extensionsVEN.length;
    }

    public static final String getFuncNamePermutation(String name, int i) {
        // identity
        if(i==0) {
            return name;
        }
        if(0>i || i>=(1+extensionsARB.length + extensionsVEN.length)) {
            throw new RuntimeException("Index out of range [0.."+(1+extensionsARB.length+extensionsVEN.length-1)+"]: "+i);
        }
        // ARB
        i-=1;
        if(i<extensionsARB.length) {
            return name+extensionsARB[i];
        }
        // VEN
        i-=extensionsARB.length;
        return name+extensionsVEN[i];
    }
}