Additional fix for http://code.google.com/p/jmonkeyengine/issues/detail?id=504.

Fixes displaying leftover characters in BitmapText when setting the text to a smaller string and a weird situation where the scene would stop rendering do to improper buffer limit. git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10060 75d07b2b-3a1a-0410-a2c5-0572b91ccdca
12 years ago · ab5282fb2d
parent 609d51dbfd
commit ab5282fb2d
1 changed files with 94 additions and 94 deletions
--- a/engine/src/android/com/jme3/renderer/android/OGLESShaderRenderer.java
+++ b/engine/src/android/com/jme3/renderer/android/OGLESShaderRenderer.java
@ -116,7 +116,7 @@ public class OGLESShaderRenderer implements Renderer {

        nameBuf.rewind();
    }
-    
+
    private void checkGLError() {
        int error;
        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
@ -131,7 +131,7 @@ public class OGLESShaderRenderer implements Renderer {
    public EnumSet<Caps> getCaps() {
        return caps;
    }
-    
+
    private int extractVersion(String prefixStr, String versionStr) {
        if (versionStr != null) {
            int spaceIdx = versionStr.indexOf(" ", prefixStr.length());
@ -152,32 +152,32 @@ public class OGLESShaderRenderer implements Renderer {
        logger.log(Level.INFO, "Renderer: {0}", GLES20.glGetString(GLES20.GL_RENDERER));
        logger.log(Level.INFO, "Version: {0}", GLES20.glGetString(GLES20.GL_VERSION));
        logger.log(Level.INFO, "Shading Language Version: {0}", GLES20.glGetString(GLES20.GL_SHADING_LANGUAGE_VERSION));
-        
+
        powerVr = GLES20.glGetString(GLES20.GL_RENDERER).contains("PowerVR");
-        
+
        // Fix issue in TestRenderToMemory when GL_FRONT is the main
        // buffer being used.

 //        initialDrawBuf = GLES20.glGetIntegeri(GLES20.GL_DRAW_BUFFER);
 //        initialReadBuf = GLES20.glGetIntegeri(GLES20.GL_READ_BUFFER);

-        // Check OpenGL version 
+        // Check OpenGL version
        int openGlVer = extractVersion("OpenGL ES ", GLES20.glGetString(GLES20.GL_VERSION));
        if (openGlVer == -1) {
            glslVer = -1;
            throw new UnsupportedOperationException("OpenGL ES 2.0+ is required for OGLESShaderRenderer!");
        }
-        
+
        // Check shader language version
        glslVer = extractVersion("OpenGL ES GLSL ES ", GLES20.glGetString(GLES20.GL_SHADING_LANGUAGE_VERSION));
        switch (glslVer) {
-            // TODO: When new versions of OpenGL ES shader language come out, 
+            // TODO: When new versions of OpenGL ES shader language come out,
            // update this.
            default:
                caps.add(Caps.GLSL100);
                break;
        }
-        
+
        GLES20.glGetIntegerv(GLES20.GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, intBuf16);
        vertexTextureUnits = intBuf16.get(0);
        logger.log(Level.INFO, "VTF Units: {0}", vertexTextureUnits);
@ -188,20 +188,20 @@ public class OGLESShaderRenderer implements Renderer {
        GLES20.glGetIntegerv(GLES20.GL_MAX_TEXTURE_IMAGE_UNITS, intBuf16);
        fragTextureUnits = intBuf16.get(0);
        logger.log(Level.INFO, "Texture Units: {0}", fragTextureUnits);
-        
+
        // Multiply vector count by 4 to get float count.
        GLES20.glGetIntegerv(GLES20.GL_MAX_VERTEX_UNIFORM_VECTORS, intBuf16);
        vertexUniforms = intBuf16.get(0) * 4;
        logger.log(Level.FINER, "Vertex Uniforms: {0}", vertexUniforms);
-        
+
        GLES20.glGetIntegerv(GLES20.GL_MAX_FRAGMENT_UNIFORM_VECTORS, intBuf16);
        fragUniforms = intBuf16.get(0) * 4;
        logger.log(Level.FINER, "Fragment Uniforms: {0}", fragUniforms);
-        
+
        GLES20.glGetIntegerv(GLES20.GL_MAX_VARYING_VECTORS, intBuf16);
        int varyingFloats = intBuf16.get(0) * 4;
        logger.log(Level.FINER, "Varying Floats: {0}", varyingFloats);
-        
+
        GLES20.glGetIntegerv(GLES20.GL_MAX_VERTEX_ATTRIBS, intBuf16);
        vertexAttribs = intBuf16.get(0);
        logger.log(Level.INFO, "Vertex Attributes: {0}", vertexAttribs);
@ -209,15 +209,15 @@ public class OGLESShaderRenderer implements Renderer {
        GLES20.glGetIntegerv(GLES20.GL_SUBPIXEL_BITS, intBuf16);
        int subpixelBits = intBuf16.get(0);
        logger.log(Level.INFO, "Subpixel Bits: {0}", subpixelBits);
-        
+
 //        GLES10.glGetIntegerv(GLES10.GL_MAX_ELEMENTS_VERTICES, intBuf16);
 //        maxVertCount = intBuf16.get(0);
 //        logger.log(Level.FINER, "Preferred Batch Vertex Count: {0}", maxVertCount);
-//        
+//
 //        GLES10.glGetIntegerv(GLES10.GL_MAX_ELEMENTS_INDICES, intBuf16);
 //        maxTriCount = intBuf16.get(0);
 //        logger.log(Level.FINER, "Preferred Batch Index Count: {0}", maxTriCount);
-        
+
        GLES20.glGetIntegerv(GLES20.GL_MAX_TEXTURE_SIZE, intBuf16);
        maxTexSize = intBuf16.get(0);
        logger.log(Level.INFO, "Maximum Texture Resolution: {0}", maxTexSize);
@ -233,23 +233,23 @@ public class OGLESShaderRenderer implements Renderer {
        caps.add(Caps.FloatColorBuffer);
        }
        }
-        
+
        if (ctxCaps.GL_ARB_depth_buffer_float){
        caps.add(Caps.FloatDepthBuffer);
        }
-        
+
        if (ctxCaps.GL_ARB_draw_instanced)
        caps.add(Caps.MeshInstancing);
-        
+
        if (ctxCaps.GL_ARB_texture_buffer_object)
        caps.add(Caps.TextureBuffer);
-        
+
        if (ctxCaps.GL_ARB_texture_float){
        if (ctxCaps.GL_ARB_half_float_pixel){
        caps.add(Caps.FloatTexture);
        }
        }
-        
+
        if (ctxCaps.GL_EXT_packed_float){
        caps.add(Caps.PackedFloatColorBuffer);
        if (ctxCaps.GL_ARB_half_float_pixel){
@ -258,32 +258,32 @@ public class OGLESShaderRenderer implements Renderer {
        caps.add(Caps.PackedFloatTexture);
        }
        }
-        
+
        if (ctxCaps.GL_EXT_texture_array)
        caps.add(Caps.TextureArray);
-        
+
        if (ctxCaps.GL_EXT_texture_shared_exponent)
        caps.add(Caps.SharedExponentTexture);
-        
+
        if (ctxCaps.GL_EXT_framebuffer_object){
        caps.add(Caps.FrameBuffer);
-        
+
        glGetInteger(GL_MAX_RENDERBUFFER_SIZE_EXT, intBuf16);
        maxRBSize = intBuf16.get(0);
        logger.log(Level.FINER, "FBO RB Max Size: {0}", maxRBSize);
-        
+
        glGetInteger(GL_MAX_COLOR_ATTACHMENTS_EXT, intBuf16);
        maxFBOAttachs = intBuf16.get(0);
        logger.log(Level.FINER, "FBO Max renderbuffers: {0}", maxFBOAttachs);
-        
+
        if (ctxCaps.GL_EXT_framebuffer_multisample){
        caps.add(Caps.FrameBufferMultisample);
-        
+
        glGetInteger(GL_MAX_SAMPLES_EXT, intBuf16);
        maxFBOSamples = intBuf16.get(0);
        logger.log(Level.FINER, "FBO Max Samples: {0}", maxFBOSamples);
        }
-        
+
        if (ctxCaps.GL_ARB_draw_buffers){
        caps.add(Caps.FrameBufferMRT);
        glGetInteger(ARBDrawBuffers.GL_MAX_DRAW_BUFFERS_ARB, intBuf16);
@ -291,7 +291,7 @@ public class OGLESShaderRenderer implements Renderer {
        logger.log(Level.FINER, "FBO Max MRT renderbuffers: {0}", maxMRTFBOAttachs);
        }
        }
-        
+
        if (ctxCaps.GL_ARB_multisample){
        glGetInteger(ARBMultisample.GL_SAMPLE_BUFFERS_ARB, intBuf16);
        boolean available = intBuf16.get(0) != 0;
@ -314,13 +314,13 @@ public class OGLESShaderRenderer implements Renderer {
        }

        TextureUtil.loadTextureFeatures(extensions);
-        
+
        applyRenderState(RenderState.DEFAULT);
        GLES20.glDisable(GLES20.GL_DITHER);

        useVBO = false;
-        
-        // NOTE: SDK_INT is only available since 1.6, 
+
+        // NOTE: SDK_INT is only available since 1.6,
        // but for jME3 it doesn't matter since android versions 1.5 and below
        // are not supported.
        if (Build.VERSION.SDK_INT >= 9){
@ -329,8 +329,8 @@ public class OGLESShaderRenderer implements Renderer {
        } else {
            useVBO = false;
        }
-        
-        logger.log(Level.INFO, "Caps: {0}", caps);        
+
+        logger.log(Level.INFO, "Caps: {0}", caps);
    }

    /**
@ -400,7 +400,7 @@ public class OGLESShaderRenderer implements Renderer {
            GLES20.glDisable(GLES20.GL_DEPTH_TEST);
            context.depthTestEnabled = false;
        }
-        
+
        if (state.isDepthWrite() && !context.depthWriteEnabled) {
            GLES20.glDepthMask(true);
            context.depthWriteEnabled = true;
@ -594,7 +594,7 @@ public class OGLESShaderRenderer implements Renderer {
            statistics.onShaderUse(shader, false);
        }
    }
-    
+
    protected void updateUniform(Shader shader, Uniform uniform) {
        int shaderId = shader.getId();

@ -752,7 +752,7 @@ public class OGLESShaderRenderer implements Renderer {
            }
            source.setId(id);
        }
-        
+
        if (!source.getLanguage().equals("GLSL100")) {
            throw new RendererException("This shader cannot run in OpenGL ES. "
                                      + "Only GLSL 1.0 shaders are supported.");
@ -876,7 +876,7 @@ public class OGLESShaderRenderer implements Renderer {
            }
        }
    }
-    
+
    public void setShader(Shader shader) {
        if (shader == null) {
            throw new IllegalArgumentException("Shader cannot be null");
@ -885,7 +885,7 @@ public class OGLESShaderRenderer implements Renderer {
                updateShaderData(shader);
            }

-            // NOTE: might want to check if any of the 
+            // NOTE: might want to check if any of the
            // sources need an update?

            assert shader.getId() > 0;
@ -900,7 +900,7 @@ public class OGLESShaderRenderer implements Renderer {
            logger.warning("Shader source is not uploaded to GPU, cannot delete.");
            return;
        }
-        
+
        source.clearUpdateNeeded();
        GLES20.glDeleteShader(source.getId());
        source.resetObject();
@ -911,14 +911,14 @@ public class OGLESShaderRenderer implements Renderer {
            logger.warning("Shader is not uploaded to GPU, cannot delete.");
            return;
        }
-        
+
        for (ShaderSource source : shader.getSources()) {
            if (source.getId() != -1) {
                GLES20.glDetachShader(shader.getId(), source.getId());
                deleteShaderSource(source);
            }
        }
-        
+
        GLES20.glDeleteProgram(shader.getId());
        statistics.onDeleteShader();
        shader.resetObject();
@ -942,18 +942,18 @@ public class OGLESShaderRenderer implements Renderer {
    int dstW = 0;
    int dstH = 0;
    int prevFBO = context.boundFBO;
-    
+
    if (src != null && src.isUpdateNeeded())
    updateFrameBuffer(src);
-    
+
    if (dst != null && dst.isUpdateNeeded())
    updateFrameBuffer(dst);
-    
+
    if (src == null){
    glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
    //                srcW = viewWidth;
    //                srcH = viewHeight;
-    }else{  
+    }else{
    glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, src.getId());
    srcW = src.getWidth();
    srcH = src.getHeight();
@ -971,7 +971,7 @@ public class OGLESShaderRenderer implements Renderer {
    0, 0, dstW, dstH,
    GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT,
    GL_NEAREST);
-    
+
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, prevFBO);
    try {
    checkFrameBufferError();
@ -1034,16 +1034,16 @@ public class OGLESShaderRenderer implements Renderer {
    id = intBuf1.get(0);
    rb.setId(id);
    }
-    
+
    if (context.boundRB != id){
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, id);
    context.boundRB = id;
    }
-    
+
    if (fb.getWidth() > maxRBSize || fb.getHeight() > maxRBSize)
    throw new UnsupportedOperationException("Resolution "+fb.getWidth()+
    ":"+fb.getHeight()+" is not supported.");
-    
+
    if (fb.getSamples() > 0 && GLContext.getCapabilities().GL_EXT_framebuffer_multisample){
    int samples = fb.getSamples();
    if (maxFBOSamples < samples){
@ -1075,7 +1075,7 @@ public class OGLESShaderRenderer implements Renderer {
    }else if (attachmentSlot < 0 || attachmentSlot >= 16){
    throw new UnsupportedOperationException("Invalid FBO attachment slot: "+attachmentSlot);
    }
-    
+
    return GL_COLOR_ATTACHMENT0_EXT + attachmentSlot;
    }
     */
@ -1089,7 +1089,7 @@ public class OGLESShaderRenderer implements Renderer {
    Image image = tex.getImage();
    if (image.isUpdateNeeded())
    updateTexImageData(image, tex.getType(), tex.getMinFilter().usesMipMapLevels());
-    
+
    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
    convertAttachmentSlot(rb.getSlot()),
    convertTextureType(tex.getType()),
@ -1133,41 +1133,41 @@ public class OGLESShaderRenderer implements Renderer {
    id = intBuf1.get(0);
    fb.setId(id);
    objManager.registerForCleanup(fb);
-    
+
    statistics.onNewFrameBuffer();
    }
-    
+
    if (context.boundFBO != id){
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id);
    // binding an FBO automatically sets draw buf to GL_COLOR_ATTACHMENT0
    context.boundDrawBuf = 0;
    context.boundFBO = id;
    }
-    
+
    FrameBuffer.RenderBuffer depthBuf = fb.getDepthBuffer();
    if (depthBuf != null){
    updateFrameBufferAttachment(fb, depthBuf);
    }
-    
+
    for (int i = 0; i < fb.getNumColorBuffers(); i++){
    FrameBuffer.RenderBuffer colorBuf = fb.getColorBuffer(i);
    updateFrameBufferAttachment(fb, colorBuf);
    }
-    
+
    fb.clearUpdateNeeded();
    }
     */

    public void setMainFrameBufferOverride(FrameBuffer fb){
    }
-    
+
    public void setFrameBuffer(FrameBuffer fb) {
    }
    /*
    public void setFrameBuffer(FrameBuffer fb) {
    if (lastFb == fb)
    return;
-    
+
    // generate mipmaps for last FB if needed
    if (lastFb != null){
    for (int i = 0; i < lastFb.getNumColorBuffers(); i++){
@ -1180,14 +1180,14 @@ public class OGLESShaderRenderer implements Renderer {
    }
    }
    }
-    
-    
+
+
    if (fb == null){
    // unbind any fbos
    if (context.boundFBO != 0){
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
    statistics.onFrameBufferUse(null, true);
-    
+
    context.boundFBO = 0;
    }
    // select back buffer
@ -1199,19 +1199,19 @@ public class OGLESShaderRenderer implements Renderer {
    glReadBuffer(initialReadBuf);
    context.boundReadBuf = -1;
    }
-    
+
    lastFb = null;
    }else{
    if (fb.isUpdateNeeded())
    updateFrameBuffer(fb);
-    
+
    if (context.boundFBO != fb.getId()){
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb.getId());
    statistics.onFrameBufferUse(fb, true);
-    
+
    // update viewport to reflect framebuffer's resolution
    setViewPort(0, 0, fb.getWidth(), fb.getHeight());
-    
+
    context.boundFBO = fb.getId();
    }else{
    statistics.onFrameBufferUse(fb, false);
@ -1233,12 +1233,12 @@ public class OGLESShaderRenderer implements Renderer {
    throw new UnsupportedOperationException("Framebuffer has more"
    + " targets than are supported"
    + " on the system!");
-    
+
    if (context.boundDrawBuf != 100 + fb.getNumColorBuffers()){
    intBuf16.clear();
    for (int i = 0; i < fb.getNumColorBuffers(); i++)
    intBuf16.put( GL_COLOR_ATTACHMENT0_EXT + i );
-    
+
    intBuf16.flip();
    glDrawBuffers(intBuf16);
    context.boundDrawBuf = 100 + fb.getNumColorBuffers();
@ -1252,12 +1252,12 @@ public class OGLESShaderRenderer implements Renderer {
    }
    }
    }
-    
+
    assert fb.getId() >= 0;
    assert context.boundFBO == fb.getId();
    lastFb = fb;
    }
-    
+
    try {
    checkFrameBufferError();
    } catch (IllegalStateException ex){
@ -1290,7 +1290,7 @@ public class OGLESShaderRenderer implements Renderer {
    if (rb == null)
    throw new IllegalArgumentException("Specified framebuffer" +
    " does not have a colorbuffer");
-    
+
    setFrameBuffer(fb);
    if (context.boundReadBuf != rb.getSlot()){
    glReadBuffer(GL_COLOR_ATTACHMENT0_EXT + rb.getSlot());
@ -1299,7 +1299,7 @@ public class OGLESShaderRenderer implements Renderer {
    }else{
    setFrameBuffer(null);
    }
-    
+
    glReadPixels(vpX, vpY, vpW, vpH, GL_RGBA GL_BGRA, GL_UNSIGNED_BYTE, byteBuf);
    }
     */
@ -1324,18 +1324,18 @@ public class OGLESShaderRenderer implements Renderer {
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
    context.boundFBO = 0;
    }
-    
+
    if (fb.getDepthBuffer() != null){
    deleteRenderBuffer(fb, fb.getDepthBuffer());
    }
    if (fb.getColorBuffer() != null){
    deleteRenderBuffer(fb, fb.getColorBuffer());
    }
-    
+
    intBuf1.put(0, fb.getId());
    glDeleteFramebuffersEXT(intBuf1);
    fb.resetObject();
-    
+
    statistics.onDeleteFrameBuffer();
    }
    }
@ -1417,16 +1417,16 @@ public class OGLESShaderRenderer implements Renderer {

        GLES20.glTexParameteri(target, GLES20.GL_TEXTURE_MIN_FILTER, minFilter);
        GLES20.glTexParameteri(target, GLES20.GL_TEXTURE_MAG_FILTER, magFilter);
-        
-        /*        
+
+        /*
        if (tex.getAnisotropicFilter() > 1){
-        
+
        if (GLContext.getCapabilities().GL_EXT_texture_filter_anisotropic){
        glTexParameterf(target,
        EXTTextureFilterAnisotropic.GL_TEXTURE_MAX_ANISOTROPY_EXT,
        tex.getAnisotropicFilter());
        }
-        
+
        }
         */
        // repeat modes
@ -1490,7 +1490,7 @@ public class OGLESShaderRenderer implements Renderer {
            GLES20.glBindTexture(target, texId);
            context.boundTextures[0] = img;
        }
-        
+
        boolean needMips = false;
        if (img.isGeneratedMipmapsRequired()) {
            needMips = true;
@ -1507,13 +1507,13 @@ public class OGLESShaderRenderer implements Renderer {
                throw new RendererException("Cannot upload texture " + img + ". The maximum supported texture resolution is " + maxTexSize);
            }
        }
-        
+
        if (target == GLES20.GL_TEXTURE_CUBE_MAP) {
            // Upload a cube map / sky box
            @SuppressWarnings("unchecked")
            List<AndroidImageInfo> bmps = (List<AndroidImageInfo>) img.getEfficentData();
            if (bmps != null) {
-                // Native android bitmap                                       
+                // Native android bitmap
                if (bmps.size() != 6) {
                    throw new UnsupportedOperationException("Invalid texture: " + img
                            + "Cubemap textures must contain 6 data units.");
@ -1752,7 +1752,7 @@ public class OGLESShaderRenderer implements Renderer {
            // delete buffer
            intBuf1.put(0, bufId);
            intBuf1.position(0).limit(1);
-           
+
            GLES20.glDeleteBuffers(1, intBuf1);
            vb.resetObject();
        }
@ -1824,7 +1824,7 @@ public class OGLESShaderRenderer implements Renderer {
                    context.boundArrayVBO = bufId;
                }

-                vb.getData().clear();
+                vb.getData().rewind();

                Android22Workaround.glVertexAttribPointer(loc,
                                    vb.getNumComponents(),
@ -1935,7 +1935,7 @@ public class OGLESShaderRenderer implements Renderer {
                count);
                 */
            } else {
-                indexData.clear();
+                indexData.rewind();
                GLES20.glDrawElements(
                        convertElementMode(mesh.getMode()),
                        indexBuf.getData().limit(),
@ -1980,7 +1980,7 @@ public class OGLESShaderRenderer implements Renderer {
        id = temp.get(0);
        mesh.setId(id);
        }
-        
+
        if (context.boundVertexArray != id){
        //     ARBVertexArrayObject.glBindVertexArray(id);
        GLES20.glBindVertexArray(id);
@ -1992,9 +1992,9 @@ public class OGLESShaderRenderer implements Renderer {
            updateBufferData(interleavedData);
        }

-      
-        for (VertexBuffer vb : mesh.getBufferList().getArray()){         
-      
+
+        for (VertexBuffer vb : mesh.getBufferList().getArray()){
+
            if (vb.getBufferType() == Type.InterleavedData
                    || vb.getUsage() == Usage.CpuOnly // ignore cpu-only buffers
                    || vb.getBufferType() == Type.Index) {
@ -2019,7 +2019,7 @@ public class OGLESShaderRenderer implements Renderer {
     */
    private void renderMeshVertexArray(Mesh mesh, int lod, int count) {
      //  IntMap<VertexBuffer> buffers = mesh.getBuffers();
-         for (VertexBuffer vb : mesh.getBufferList().getArray()){         
+         for (VertexBuffer vb : mesh.getBufferList().getArray()){

            if (vb.getBufferType() == Type.InterleavedData
                    || vb.getUsage() == Usage.CpuOnly // ignore cpu-only buffers
@ -2065,8 +2065,8 @@ public class OGLESShaderRenderer implements Renderer {
        } else {
            indices = mesh.getBuffer(Type.Index);// buffers.get(Type.Index.ordinal());
        }
-        for (VertexBuffer vb : mesh.getBufferList().getArray()){         
-         
+        for (VertexBuffer vb : mesh.getBufferList().getArray()){
+
            if (vb.getBufferType() == Type.InterleavedData
                    || vb.getUsage() == Usage.CpuOnly // ignore cpu-only buffers
                    || vb.getBufferType() == Type.Index) {
@ -2131,7 +2131,7 @@ public class OGLESShaderRenderer implements Renderer {

        int vertCount = mesh.getVertexCount();
        Buffer indexData = indexBuf.getData();
-        indexData.clear();
+        indexData.rewind();

        if (mesh.getMode() == Mode.Hybrid) {
            int[] modeStart = mesh.getModeStart();
@ -2202,7 +2202,7 @@ public class OGLESShaderRenderer implements Renderer {
            if ((attribs[loc] != vb) || vb.isUpdateNeeded()) {
                // NOTE: Use data from interleaved buffer if specified
                VertexBuffer avb = idb != null ? idb : vb;
-                avb.getData().clear();
+                avb.getData().rewind();
                avb.getData().position(vb.getOffset());

                // Upload attribute data