Initial import attempt, just to play with. Many things disabled/removed

ui/cc/TrackingTextureAllocator.cpp

Index: ui/cc/TrackingTextureAllocator.cpp
diff --git a/ui/cc/TrackingTextureAllocator.cpp b/ui/cc/TrackingTextureAllocator.cpp
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index 0000000000000000000000000000000000000000..427966763a6ee45be4696f90c235a2cd12d39be2
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+++ b/ui/cc/TrackingTextureAllocator.cpp
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+/*
+ * Copyright (C) 2011, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "TrackingTextureAllocator.h"
+
+#include "Extensions3DChromium.h"
+#include "GraphicsContext3D.h"
+#include "IntRect.h"
+#include "LayerRendererChromium.h" // For the GLC() macro
+
+namespace WebCore {
+
+TrackingTextureAllocator::TrackingTextureAllocator(WebKit::WebGraphicsContext3D* context)
+    : m_context(context)
+    , m_currentMemoryUseBytes(0)
+    , m_textureUsageHint(Any)
+    , m_useTextureStorageExt(false)
+{
+    ASSERT(m_context);
+}
+
+TrackingTextureAllocator::~TrackingTextureAllocator()
+{
+    ASSERT(!m_currentMemoryUseBytes);
+}
+
+static GC3Denum textureToStorageFormat(GC3Denum textureFormat)
+{
+    GC3Denum storageFormat = GL_RGBA8_OES;
+    switch (textureFormat) {
+    case GL_RGBA:
+        break;
+    case GL_BGRA_EXT:
+        storageFormat = GL_BGRA8_EXT;
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+        break;
+    }
+
+    return storageFormat;
+}
+
+static bool isTextureFormatSupportedForStorage(GC3Denum format)
+{
+    return (format == GL_RGBA || format == GL_BGRA_EXT);
+}
+
+unsigned TrackingTextureAllocator::createTexture(const IntSize& size, GC3Denum format)
+{
+    m_currentMemoryUseBytes += TextureManager::memoryUseBytes(size, format);
+
+    unsigned textureId = 0;
+    GLC(m_context, textureId = m_context->createTexture());
+    GLC(m_context, m_context->bindTexture(GL_TEXTURE_2D, textureId));
+    // Do basic linear filtering on resize.
+    GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
+    GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
+    // NPOT textures in GL ES only work when the wrap mode is set to GL_CLAMP_TO_EDGE.
+    GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
+    GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
+
+    if (m_textureUsageHint == FramebufferAttachment)
+        GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_USAGE_ANGLE, GL_FRAMEBUFFER_ATTACHMENT_ANGLE));
+    if (m_useTextureStorageExt && isTextureFormatSupportedForStorage(format)) {
+        GC3Denum storageFormat = textureToStorageFormat(format);
+        m_context->texStorage2DEXT(GL_TEXTURE_2D, 1, storageFormat, size.width(), size.height());
+    } else
+        GLC(m_context, m_context->texImage2D(GL_TEXTURE_2D, 0, format, size.width(), size.height(), 0, format, GL_UNSIGNED_BYTE, 0));
+    m_allocatedTextureIds.add(textureId);
+    return textureId;
+}
+
+void TrackingTextureAllocator::deleteTexture(unsigned textureId, const IntSize& size, GC3Denum format)
+{
+    m_currentMemoryUseBytes -= TextureManager::memoryUseBytes(size, format);
+    GLC(m_context, m_context->deleteTexture(textureId));
+    GLC(m_context, m_context->deleteTexture(textureId));
+    ASSERT(m_allocatedTextureIds.contains(textureId));
+    m_allocatedTextureIds.remove(textureId);
+}
+
+void TrackingTextureAllocator::deleteAllTextures()
+{
+    for (HashSet<unsigned>::const_iterator it = m_allocatedTextureIds.begin(); it != m_allocatedTextureIds.end(); ++it)
+        GLC(m_context, m_context->deleteTexture(*it));
+    m_currentMemoryUseBytes = 0;
+    m_allocatedTextureIds.clear();
+}
+
+}
+