gl constants <-> string mappings

[anarchotron]

Does LWJGL have a mapping from gl constants to string representations of those constants?  E.g. I need to convert "GL_TEXTURE" to GL_TEXTURE and so on, and vice-versa.  I don't see anything like this but I thought I'd check.

[princec]

Nope, it's beyond the remit of LWJGL, but fortunately I have a thingy to do it for me in SPGL

Cas

[Riven]

Using reflection it's a piece of cake.

If you have to do it often, you can cache the results in a HashMap.



But you shouldn't do it often for obvious reasons...

Games published by our own members! Check 'em out!

[princec]

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/** A map of constant names to values */      private static final HashMap glConstantsMap = new HashMap(513, 1.0f);        static {       loadGLConstants();    }    /**     * Decode a gl string constant     */    public static int decode(String glstring) throws OpenGLException {       Integer i = (Integer) glConstantsMap.get(glstring.toUpperCase());       if (i == null)          throw new OpenGLException(glstring+" is not a recognised GL constant");       else          return i.intValue();          }        /**     * Recode a gl constant back into a string     */    public static String recode(int code) {       for (Iterator i = glConstantsMap.keySet().iterator(); i.hasNext(); ) {          String s = (String) i.next();          Integer n = (Integer) glConstantsMap.get(s);          if (n.intValue() == code)             return s;       }       throw new OpenGLException(code+" is not a known GL code");    }    private static void loadGLConstants(Class intf) {       Field[] field = intf.getFields();       for (int i = 0; i < field.length; i ++) {          try {             if (Modifier.isStatic(field[i].getModifiers()) && Modifier.isPublic(field[i].getModifiers()) && Modifier.isFinal(field[i].getModifiers()) && field[i].getType().equals(int.class))                glConstantsMap.put(field[i].getName(), new Integer(field[i].getInt(null)));          } catch (Exception e) {          }       }    }    /**     * Reads all the constant enumerations from this class and stores them     * so we can decode them from strings.     * @see #decode()     * @see #recode()     */    private static void loadGLConstants() {       Class[] classes = new Class[] {          GL11.class,          GL12.class,          GL13.class,          GL14.class,          GL15.class,          ARBMultitexture.class,          ARBTextureCubeMap.class,          ARBDepthTexture.class,          ARBFragmentProgram.class,          ARBMatrixPalette.class,          ARBMultisample.class,          ARBPointParameters.class,          ARBShadow.class,          ARBShadowAmbient.class,          ARBTextureBorderClamp.class,          ARBTextureCompression.class,          ARBTextureEnvCombine.class,          ARBTextureEnvDot3.class,          ARBTextureMirroredRepeat.class,          ARBTransposeMatrix.class,          ARBVertexBlend.class,          ARBVertexBufferObject.class,          ARBVertexProgram.class,          ARBWindowPos.class,          EXTDrawRangeElements.class,          EXTAbgr.class,          EXTBgra.class,          EXTBlendFuncSeparate.class,          EXTBlendSubtract.class,          EXTCompiledVertexArray.class,          EXTFogCoord.class,          EXTMultiDrawArrays.class,          EXTPackedPixels.class,          EXTPointParameters.class,          EXTRescaleNormal.class,          EXTSecondaryColor.class,          EXTSeparateSpecularColor.class,          EXTSharedTexturePalette.class,          EXTStencilTwoSide.class,          EXTStencilWrap.class,          EXTTextureCompressionS3TC.class,          EXTTextureEnvCombine.class,          EXTTextureEnvDot3.class,          EXTTextureFilterAnisotropic.class,          EXTTextureLODBias.class,          EXTVertexShader.class,          EXTVertexWeighting.class,          ATIElementArray.class,          ATIEnvmapBumpmap.class,          ATIFragmentShader.class,          ATIPnTriangles.class,          ATISeparateStencil.class,          ATITextureMirrorOnce.class,          ATIVertexArrayObject.class,          ATIVertexStreams.class,          NVCopyDepthToColor.class,          NVDepthClamp.class,          NVEvaluators.class,          NVFence.class,          NVFogDistance.class,          NVLightMaxExponent.class,          NVOcclusionQuery.class,          NVPackedDepthStencil.class,          NVPointSprite.class,          NVRegisterCombiners.class,          NVRegisterCombiners2.class,          NVTexgenReflection.class,          NVTextureEnvCombine4.class,          NVTextureRectangle.class,          NVTextureShader.class,          NVTextureShader2.class,          NVTextureShader3.class,          NVVertexArrayRange.class,          NVVertexArrayRange2.class,          NVVertexProgram.class       };       for (int i = 0; i < classes.length; i ++) {          loadGLConstants(classes[i]);       }    }

Cas

[Riven]

recode(..) would be much faster if it used a HashMap with the keys/values of the glConstantsMap flipped.

[princec]

Well, it might be, except that I only use that method during development to read XML files in...

Cas