8023794: [macosx] LCD Rendering hints seems not working without FRACTIONALMETRICS=ON

Reviewed-by: serb, prr

src/macosx/classes/sun/lwawt/macosx/LWCToolkit.java

@@ -366,8 +366,7 @@ public final class LWCToolkit extends LWToolkit {
     protected void initializeDesktopProperties() {
         super.initializeDesktopProperties();
         Map <Object, Object> fontHints = new HashMap<>();
-        fontHints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
-        fontHints.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
+        fontHints.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
         desktopProperties.put(SunToolkit.DESKTOPFONTHINTS, fontHints);
         desktopProperties.put("awt.mouse.numButtons", BUTTONS);
 

src/macosx/native/sun/font/AWTStrike.m

@@ -311,22 +311,27 @@ JNF_COCOA_ENTER(env);
 
     jlong *glyphInfos =
         (*env)->GetPrimitiveArrayCritical(env, glyphInfoLongArray, NULL);
-    if (glyphInfos != NULL) {
+
     jint *rawGlyphCodes =
             (*env)->GetPrimitiveArrayCritical(env, glyphCodes, NULL);
-
-        if (rawGlyphCodes != NULL) {
+    @try {
+        if (rawGlyphCodes != NULL && glyphInfos != NULL) {
             CGGlyphImages_GetGlyphImagePtrs(glyphInfos, awtStrike,
                     rawGlyphCodes, len);
-
+        }
+    }
+    @finally {
+        if (rawGlyphCodes != NULL) {
             (*env)->ReleasePrimitiveArrayCritical(env, glyphCodes,
                                                   rawGlyphCodes, JNI_ABORT);
         }
+        if (glyphInfos != NULL) {
             // Do not use JNI_COMMIT, as that will not free the buffer copy
             // when +ProtectJavaHeap is on.
             (*env)->ReleasePrimitiveArrayCritical(env, glyphInfoLongArray,
                                                   glyphInfos, 0);
         }
+    }
 
 JNF_COCOA_EXIT(env);
 }

src/macosx/native/sun/font/CGGlyphImages.m

@@ -195,19 +195,41 @@ DUMP_GLYPHINFO(const GlyphInfo *info)
 
 
 #pragma mark --- Font Rendering Mode Descriptors ---
+static Int32 reverseGamma = 0;
+
+static UInt8 reverseGammaLut[256] = { 0 };
+
+static inline UInt8* getReverseGammaLut() {
+    if (reverseGamma == 0) {
+        // initialize gamma lut
+        double gamma;
+        int i;
+        const char* pGammaEnv = getenv("J2D_LCD_REVERSE_GAMMA");
+        if (pGammaEnv != NULL) {
+            reverseGamma = atol(pGammaEnv);
+        }
+
+        if (reverseGamma < 100 || reverseGamma > 250) {
+            reverseGamma = 180;
+        }
+
+        gamma = 100.0 / reverseGamma;
+        for (i = 0; i < 256; i++) {
+            double x = ((double)i) / 255.0;
+            reverseGammaLut[i] = (UInt8)(255 * pow(x, gamma));
+        }
+    }
+    return reverseGammaLut;
+}
 
 static inline void
 CGGI_CopyARGBPixelToRGBPixel(const UInt32 p, UInt8 *dst)
 {
-#if __LITTLE_ENDIAN__
-    *(dst + 2) = 0xFF - (p >> 24 & 0xFF);
-    *(dst + 1) = 0xFF - (p >> 16 & 0xFF);
-    *(dst) = 0xFF - (p >> 8 & 0xFF);
-#else
-    *(dst) = 0xFF - (p >> 16 & 0xFF);
-    *(dst + 1) = 0xFF - (p >> 8 & 0xFF);
-    *(dst + 2) = 0xFF - (p & 0xFF);
-#endif
+    UInt8* lut = getReverseGammaLut();
+
+    *(dst + 0) = lut[0xFF - (p >> 16 & 0xFF)];  // red
+    *(dst + 1) = lut[0xFF - (p >>  8 & 0xFF)];  // green
+    *(dst + 2) = lut[0xFF - (p & 0xFF)];        // blue
 }
 
 static void
@@ -222,17 +244,14 @@ CGGI_CopyImageFromCanvasToRGBInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
     size_t height = info->height;
 
     size_t y;
+    
+    // fill empty glyph image with black-on-white glyph
     for (y = 0; y < height; y++) {
         size_t destRow = y * destRowWidth * 3;
         size_t srcRow = y * srcRowWidth;
 
         size_t x;
         for (x = 0; x < destRowWidth; x++) {
-            // size_t x3 = x * 3;
-            // UInt32 p = src[srcRow + x];
-            // dest[destRow + x3] = 0xFF - (p >> 16 & 0xFF);
-            // dest[destRow + x3 + 1] = 0xFF - (p >> 8 & 0xFF);
-            // dest[destRow + x3 + 2] = 0xFF - (p & 0xFF);
             CGGI_CopyARGBPixelToRGBPixel(src[srcRow + x],
                                          dest + destRow + x * 3);
         }
@@ -260,13 +279,9 @@ CGGI_CopyImageFromCanvasToRGBInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
 //}
 
 static inline UInt8
-CGGI_ConvertPixelToGreyBit(UInt32 p)
+CGGI_ConvertBWPixelToByteGray(UInt32 p)
 {
-#ifdef __LITTLE_ENDIAN__
-    return 0xFF - ((p >> 24 & 0xFF) + (p >> 16 & 0xFF) + (p >> 8 & 0xFF)) / 3;
-#else
-    return 0xFF - ((p >> 16 & 0xFF) + (p >> 8 & 0xFF) + (p & 0xFF)) / 3;
-#endif
+    return 0xFF - (((p >> 24 & 0xFF) + (p >> 16 & 0xFF) + (p >> 8 & 0xFF)) / 3);
 }
 
 static void
@@ -281,14 +296,15 @@ CGGI_CopyImageFromCanvasToAlphaInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
     size_t height = info->height;
 
     size_t y;
+    
+    // fill empty glyph image with black-on-white glyph
     for (y = 0; y < height; y++) {
         size_t destRow = y * destRowWidth;
         size_t srcRow = y * srcRowWidth;
-
         size_t x;
         for (x = 0; x < destRowWidth; x++) {
             UInt32 p = src[srcRow + x];
-            dest[destRow + x] = CGGI_ConvertPixelToGreyBit(p);
+            dest[destRow + x] = CGGI_ConvertBWPixelToByteGray(p);
         }
     }
 }
@@ -316,13 +332,11 @@ CGGI_GetRenderingMode(const AWTStrike *strike)
 {
     CGGI_RenderingMode mode;
     mode.cgFontMode = strike->fStyle;
+    NSException *e = nil;
 
     switch (strike->fAAStyle) {
-    case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_DEFAULT:
     case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_OFF:
     case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_ON:
-    case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_GASP:
-    default:
         mode.glyphDescriptor = &grey;
         break;
     case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HRGB:
@@ -331,6 +345,17 @@ CGGI_GetRenderingMode(const AWTStrike *strike)
     case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VBGR:
         mode.glyphDescriptor = &rgb;
         break;
+    case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_GASP:
+    case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_DEFAULT:
+    default:
+        /* we expect that text antialiasing hint has been already
+         * evaluated. Report an error if we get 'unevaluated' hint here.
+         */
+        e = [NSException
+                exceptionWithName:@"IllegalArgumentException"
+                reason:@"Invalid hint value"
+                userInfo:nil];
+        @throw e;
     }
 
     return mode;
@@ -345,7 +370,8 @@ CGGI_GetRenderingMode(const AWTStrike *strike)
  */
 static inline void
 CGGI_InitCanvas(CGGI_GlyphCanvas *canvas,
-                const vImagePixelCount width, const vImagePixelCount height)
+                const vImagePixelCount width, const vImagePixelCount height,
+                const CGGI_RenderingMode* mode)
 {
     // our canvas is *always* 4-byte ARGB
     size_t bytesPerRow = width * sizeof(UInt32);
@@ -356,19 +382,26 @@ CGGI_InitCanvas(CGGI_GlyphCanvas *canvas,
     canvas->image->height = height;
     canvas->image->rowBytes = bytesPerRow;
 
-    canvas->image->data = (void *)calloc(byteCount, sizeof(UInt32));
+    canvas->image->data = (void *)calloc(byteCount, sizeof(UInt8));
     if (canvas->image->data == NULL) {
         [[NSException exceptionWithName:NSMallocException
             reason:@"Failed to allocate memory for the buffer which backs the CGContext for glyph strikes." userInfo:nil] raise];
     }
 
-    CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+    uint32_t bmpInfo = kCGImageAlphaPremultipliedFirst;
+    if (mode->glyphDescriptor == &rgb) {
+        bmpInfo |= kCGBitmapByteOrder32Host;
+    }
+
+    CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
     canvas->context = CGBitmapContextCreate(canvas->image->data,
                                             width, height, 8, bytesPerRow,
                                             colorSpace,
-                                            kCGImageAlphaPremultipliedFirst);
+                                            bmpInfo);
 
+    // set foreground color
     CGContextSetRGBFillColor(canvas->context, 0.0f, 0.0f, 0.0f, 1.0f);
+    
     CGContextSetFontSize(canvas->context, 1);
     CGContextSaveGState(canvas->context);
 
@@ -404,7 +437,9 @@ CGGI_FreeCanvas(CGGI_GlyphCanvas *canvas)
  * Quick and easy inline to check if this canvas is big enough.
  */
 static inline void
-CGGI_SizeCanvas(CGGI_GlyphCanvas *canvas, const vImagePixelCount width, const vImagePixelCount height, const JRSFontRenderingStyle style)
+CGGI_SizeCanvas(CGGI_GlyphCanvas *canvas, const vImagePixelCount width,
+        const vImagePixelCount height,
+        const CGGI_RenderingMode* mode)
 {
     if (canvas->image != NULL &&
         width  < canvas->image->width &&
@@ -418,8 +453,9 @@ CGGI_SizeCanvas(CGGI_GlyphCanvas *canvas, const vImagePixelCount width, const vI
     CGGI_FreeCanvas(canvas);
     CGGI_InitCanvas(canvas,
                     width * CGGI_GLYPH_CANVAS_SLACK,
-                    height * CGGI_GLYPH_CANVAS_SLACK);
-    JRSFontSetRenderingStyleOnContext(canvas->context, style);
+                    height * CGGI_GLYPH_CANVAS_SLACK,
+                    mode);
+    JRSFontSetRenderingStyleOnContext(canvas->context, mode->cgFontMode);
 }
 
 /*
@@ -443,6 +479,7 @@ CGGI_ClearCanvas(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
     Pixel_8888 opaqueWhite = { 0xFF, 0xFF, 0xFF, 0xFF };
 #endif
 
+    // clear canvas background and set foreground color
     vImageBufferFill_ARGB8888(&canvasRectToClear, opaqueWhite, kvImageNoFlags);
 }
 
@@ -577,7 +614,7 @@ CGGI_CreateImageForUnicode
     GlyphInfo *info = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
 
     // fix the context size, just in case the substituted character is unexpectedly large
-    CGGI_SizeCanvas(canvas, info->width, info->height, mode->cgFontMode);
+    CGGI_SizeCanvas(canvas, info->width, info->height, mode);
 
     // align the transform for the real CoreText strike
     CGContextSetTextMatrix(canvas->context, strike->fAltTx);
@@ -653,8 +690,11 @@ CGGI_FillImagesForGlyphsWithSizedCanvas(CGGI_GlyphCanvas *canvas,
 #endif
 }
 
-static NSString *threadLocalCanvasKey =
-    @"Java CoreGraphics Text Renderer Cached Canvas";
+static NSString *threadLocalAACanvasKey =
+    @"Java CoreGraphics Text Renderer Cached Canvas for AA";
+
+static NSString *threadLocalLCDCanvasKey =
+    @"Java CoreGraphics Text Renderer Cached Canvas for LCD";
 
 /*
  * This is the maximum length and height times the above slack squared
@@ -678,7 +718,7 @@ CGGI_FillImagesForGlyphs(jlong *glyphInfos, const AWTStrike *strike,
         CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK)
     {
         CGGI_GlyphCanvas *tmpCanvas = [[CGGI_GlyphCanvas alloc] init];
-        CGGI_InitCanvas(tmpCanvas, maxWidth, maxHeight);
+        CGGI_InitCanvas(tmpCanvas, maxWidth, maxHeight, mode);
         CGGI_FillImagesForGlyphsWithSizedCanvas(tmpCanvas, strike,
                 mode, glyphInfos, uniChars,
                 glyphs, len);
@@ -687,16 +727,19 @@ CGGI_FillImagesForGlyphs(jlong *glyphInfos, const AWTStrike *strike,
         [tmpCanvas release];
         return;
     }
-
     NSMutableDictionary *threadDict =
         [[NSThread currentThread] threadDictionary];
-    CGGI_GlyphCanvas *canvas = [threadDict objectForKey:threadLocalCanvasKey];
+
+    NSString* theKey = (mode->glyphDescriptor == &rgb) ?
+        threadLocalLCDCanvasKey : threadLocalAACanvasKey;
+    
+    CGGI_GlyphCanvas *canvas = [threadDict objectForKey:theKey];
     if (canvas == nil) {
         canvas = [[CGGI_GlyphCanvas alloc] init];
-        [threadDict setObject:canvas forKey:threadLocalCanvasKey];
+        [threadDict setObject:canvas forKey:theKey];
     }
 
-    CGGI_SizeCanvas(canvas, maxWidth, maxHeight, mode->cgFontMode);
+    CGGI_SizeCanvas(canvas, maxWidth, maxHeight, mode);
     CGGI_FillImagesForGlyphsWithSizedCanvas(canvas, strike, mode,
                                             glyphInfos, uniChars, glyphs, len);
 }

src/share/classes/sun/java2d/opengl/OGLSurfaceData.java

@@ -26,6 +26,7 @@
 package sun.java2d.opengl;
 
 import java.awt.AlphaComposite;
+import java.awt.Composite;
 import java.awt.GraphicsEnvironment;
 import java.awt.Rectangle;
 import java.awt.Transparency;
@@ -400,8 +401,8 @@ public abstract class OGLSurfaceData extends SurfaceData
     /**
      * For now, we can only render LCD text if:
      *   - the fragment shader extension is available, and
-     *   - blending is disabled, and
-     *   - the source color is opaque
+     *   - the source color is opaque, and
+     *   - blending is SrcOverNoEa or disabled
      *   - and the destination is opaque
      *
      * Eventually, we could enhance the native OGL text rendering code
@@ -411,9 +412,19 @@ public abstract class OGLSurfaceData extends SurfaceData
     public boolean canRenderLCDText(SunGraphics2D sg2d) {
         return
             graphicsConfig.isCapPresent(CAPS_EXT_LCD_SHADER) &&
-            sg2d.compositeState <= SunGraphics2D.COMP_ISCOPY &&
+            sg2d.surfaceData.getTransparency() == Transparency.OPAQUE &&
             sg2d.paintState <= SunGraphics2D.PAINT_OPAQUECOLOR &&
-            sg2d.surfaceData.getTransparency() == Transparency.OPAQUE;
+            (sg2d.compositeState <= SunGraphics2D.COMP_ISCOPY ||
+             (sg2d.compositeState <= SunGraphics2D.COMP_ALPHA && canHandleComposite(sg2d.composite)));
+    }
+
+    private boolean canHandleComposite(Composite c) {
+        if (c instanceof AlphaComposite) {
+            AlphaComposite ac = (AlphaComposite)c;
+
+            return ac.getRule() == AlphaComposite.SRC_OVER && ac.getAlpha() >= 1f;
+        }
+        return false;
     }
 
     public void validatePipe(SunGraphics2D sg2d) {

src/share/native/sun/java2d/opengl/OGLContext.c

@@ -748,7 +748,7 @@ OGLContext_IsLCDShaderSupportAvailable(JNIEnv *env,
     // finally, check to see if the hardware supports the required number
     // of texture units
     j2d_glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS_ARB, &maxTexUnits);
-    if (maxTexUnits < 4) {
+    if (maxTexUnits < 2) {
         J2dRlsTraceLn1(J2D_TRACE_INFO,
           "OGLContext_IsLCDShaderSupportAvailable: not enough tex units (%d)",
           maxTexUnits);

src/share/native/sun/java2d/opengl/OGLTextRenderer.c

@@ -275,12 +275,9 @@ OGLTR_AddToGlyphCache(GlyphInfo *glyph, jboolean rgbOrder)
  * changes, we will modify the "src_adj" value in OGLTR_UpdateLCDTextColor()).
  *
  * The "main" function is executed for each "fragment" (or pixel) in the
- * glyph image.  We have determined that the pow() function can be quite
- * slow and it only operates on scalar values, not vectors as we require.
- * So instead we build two 3D textures containing gamma (and inverse gamma)
- * lookup tables that allow us to approximate a component-wise pow() function
- * with a single 3D texture lookup.  This approach is at least 2x faster
- * than the equivalent pow() calls.
+ * glyph image. The pow() routine operates on vectors, gives precise results,
+ * and provides acceptable level of performance, so we use it to perform
+ * the gamma adjustment.
  *
  * The variables involved in the equation can be expressed as follows:
  *
@@ -299,8 +296,8 @@ static const char *lcdTextShaderSource =
     "uniform vec3 src_adj;"
     "uniform sampler2D glyph_tex;"
     "uniform sampler2D dst_tex;"
-    "uniform sampler3D invgamma_tex;"
-    "uniform sampler3D gamma_tex;"
+    "uniform vec3 gamma;"
+    "uniform vec3 invgamma;"
     ""
     "void main(void)"
     "{"
@@ -312,12 +309,12 @@ static const char *lcdTextShaderSource =
     "    }"
          // load the RGB value from the corresponding destination pixel
     "    vec3 dst_clr = vec3(texture2D(dst_tex, gl_TexCoord[1].st));"
-         // gamma adjust the dest color using the invgamma LUT
-    "    vec3 dst_adj = vec3(texture3D(invgamma_tex, dst_clr.stp));"
+         // gamma adjust the dest color
+    "    vec3 dst_adj = pow(dst_clr.rgb, gamma);"
          // linearly interpolate the three color values
     "    vec3 result = mix(dst_adj, src_adj, glyph_clr);"
          // gamma re-adjust the resulting color (alpha is always set to 1.0)
-    "    gl_FragColor = vec4(vec3(texture3D(gamma_tex, result.stp)), 1.0);"
+    "    gl_FragColor = vec4(pow(result.rgb, invgamma), 1.0);"
     "}";
 
 /**
@@ -348,10 +345,6 @@ OGLTR_CreateLCDTextProgram()
     j2d_glUniform1iARB(loc, 0); // texture unit 0
     loc = j2d_glGetUniformLocationARB(lcdTextProgram, "dst_tex");
     j2d_glUniform1iARB(loc, 1); // texture unit 1
-    loc = j2d_glGetUniformLocationARB(lcdTextProgram, "invgamma_tex");
-    j2d_glUniform1iARB(loc, 2); // texture unit 2
-    loc = j2d_glGetUniformLocationARB(lcdTextProgram, "gamma_tex");
-    j2d_glUniform1iARB(loc, 3); // texture unit 3
 
     // "unuse" the program object; it will be re-bound later as needed
     j2d_glUseProgramObjectARB(0);
@@ -360,108 +353,26 @@ OGLTR_CreateLCDTextProgram()
 }
 
 /**
- * Initializes a 3D texture object for use as a three-dimensional gamma
- * lookup table.  Note that the wrap mode is initialized to GL_LINEAR so
- * that the table will interpolate adjacent values when the index falls
- * somewhere in between.
- */
-static GLuint
-OGLTR_InitGammaLutTexture()
-{
-    GLuint lutTextureID;
-
-    j2d_glGenTextures(1, &lutTextureID);
-    j2d_glBindTexture(GL_TEXTURE_3D, lutTextureID);
-    j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
-
-    return lutTextureID;
-}
-
-/**
- * Updates the lookup table in the given texture object with the float
- * values in the given system memory buffer.  Note that we could use
- * glTexSubImage3D() when updating the texture after its first
- * initialization, but since we're updating the entire table (with
- * power-of-two dimensions) and this is a relatively rare event, we'll
- * just stick with glTexImage3D().
- */
-static void
-OGLTR_UpdateGammaLutTexture(GLuint texID, GLfloat *lut, jint size)
-{
-    j2d_glBindTexture(GL_TEXTURE_3D, texID);
-    j2d_glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB8,
-                     size, size, size, 0, GL_RGB, GL_FLOAT, lut);
-}
-
-/**
- * (Re)Initializes the gamma lookup table textures.
+ * (Re)Initializes the gamma related uniforms.
  *
  * The given contrast value is an int in the range [100, 250] which we will
- * then scale to fit in the range [1.0, 2.5].  We create two LUTs, one
- * that essentially calculates pow(x, gamma) and the other calculates
- * pow(x, 1/gamma).  These values are replicated in all three dimensions, so
- * given a single 3D texture coordinate (typically this will be a triplet
- * in the form (r,g,b)), the 3D texture lookup will return an RGB triplet:
- *
- *     (pow(r,g), pow(y,g), pow(z,g)
- *
- * where g is either gamma or 1/gamma, depending on the table.
+ * then scale to fit in the range [1.0, 2.5].
  */
 static jboolean
 OGLTR_UpdateLCDTextContrast(jint contrast)
 {
-    double gamma = ((double)contrast) / 100.0;
-    double ig = gamma;
-    double g = 1.0 / ig;
-    GLfloat lut[LUT_EDGE][LUT_EDGE][LUT_EDGE][3];
-    GLfloat invlut[LUT_EDGE][LUT_EDGE][LUT_EDGE][3];
-    int min = 0;
-    int max = LUT_EDGE - 1;
-    int x, y, z;
+    double g = ((double)contrast) / 100.0;
+    double ig = 1.0 / g;
+    GLint loc;
 
     J2dTraceLn1(J2D_TRACE_INFO,
                 "OGLTR_UpdateLCDTextContrast: contrast=%d", contrast);
 
-    for (z = min; z <= max; z++) {
-        double zval = ((double)z) / max;
-        GLfloat gz = (GLfloat)pow(zval, g);
-        GLfloat igz = (GLfloat)pow(zval, ig);
-
-        for (y = min; y <= max; y++) {
-            double yval = ((double)y) / max;
-            GLfloat gy = (GLfloat)pow(yval, g);
-            GLfloat igy = (GLfloat)pow(yval, ig);
+    loc = j2d_glGetUniformLocationARB(lcdTextProgram, "gamma");
+    j2d_glUniform3fARB(loc, g, g, g);
 
-            for (x = min; x <= max; x++) {
-                double xval = ((double)x) / max;
-                GLfloat gx = (GLfloat)pow(xval, g);
-                GLfloat igx = (GLfloat)pow(xval, ig);
-
-                lut[z][y][x][0] = gx;
-                lut[z][y][x][1] = gy;
-                lut[z][y][x][2] = gz;
-
-                invlut[z][y][x][0] = igx;
-                invlut[z][y][x][1] = igy;
-                invlut[z][y][x][2] = igz;
-            }
-        }
-    }
-
-    if (gammaLutTextureID == 0) {
-        gammaLutTextureID = OGLTR_InitGammaLutTexture();
-    }
-    OGLTR_UpdateGammaLutTexture(gammaLutTextureID, (GLfloat *)lut, LUT_EDGE);
-
-    if (invGammaLutTextureID == 0) {
-        invGammaLutTextureID = OGLTR_InitGammaLutTexture();
-    }
-    OGLTR_UpdateGammaLutTexture(invGammaLutTextureID,
-                                (GLfloat *)invlut, LUT_EDGE);
+    loc = j2d_glGetUniformLocationARB(lcdTextProgram, "invgamma");
+    j2d_glUniform3fARB(loc, ig, ig, ig);
 
     return JNI_TRUE;
 }