cc: Defer texture allocation (to allow async allocations).

cc/resource_provider.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resource_provider.h"
 
 #include <limits.h>
 
 #include "base/debug/alias.h"
 #include "base/hash_tables.h"
@@ skipping 42 matching lines @@
     , glPixelBufferId(0)
     , glUploadQueryId(0)
     , pixels(0)
     , pixelBuffer(0)
     , lockForReadCount(0)
     , lockedForWrite(false)
     , external(false)
     , exported(false)
     , markedForDeletion(false)
     , pendingSetPixels(false)
+    , allocated(false)
     , size()
     , format(0)
     , filter(0)
     , type(static_cast<ResourceType>(0))
 {
 }
 
 ResourceProvider::Resource::Resource(unsigned textureId, const gfx::Size& size, GLenum format, GLenum filter)
     : glId(textureId)
     , glPixelBufferId(0)
     , glUploadQueryId(0)
     , pixels(0)
     , pixelBuffer(0)
     , lockForReadCount(0)
     , lockedForWrite(false)
     , external(false)
     , exported(false)
     , markedForDeletion(false)
     , pendingSetPixels(false)
+    , allocated(false)
     , size(size)
     , format(format)
     , filter(filter)
     , type(GLTexture)
 {
 }
 
 ResourceProvider::Resource::Resource(uint8_t* pixels, const gfx::Size& size, GLenum format, GLenum filter)
     : glId(0)
     , glPixelBufferId(0)
     , glUploadQueryId(0)
     , pixels(pixels)
     , pixelBuffer(0)
     , lockForReadCount(0)
     , lockedForWrite(false)
     , external(false)
     , exported(false)
     , markedForDeletion(false)
     , pendingSetPixels(false)
+    , allocated(false)
     , size(size)
     , format(format)
     , filter(filter)
     , type(Bitmap)
 {
 }
 
 ResourceProvider::Child::Child()
 {
 }
@@ skipping 66 matching lines @@
 {
     DCHECK_LE(size.width(), m_maxTextureSize);
     DCHECK_LE(size.height(), m_maxTextureSize);
 
     DCHECK(m_threadChecker.CalledOnValidThread());
     unsigned textureId = 0;
     WebGraphicsContext3D* context3d = m_outputSurface->Context3D();
     DCHECK(context3d);
     GLC(context3d, textureId = context3d->createTexture());
     GLC(context3d, context3d->bindTexture(GL_TEXTURE_2D, textureId));
+
+    // Set texture properties. Allocation is delayed until needed.
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_POOL_CHROMIUM, texturePool));
-
     if (m_useTextureUsageHint && hint == TextureUsageFramebuffer)
         GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_USAGE_ANGLE, GL_FRAMEBUFFER_ATTACHMENT_ANGLE));
-    if (m_useTextureStorageExt && isTextureFormatSupportedForStorage(format)) {
-        GLenum storageFormat = textureToStorageFormat(format);
-        GLC(context3d, context3d->texStorage2DEXT(GL_TEXTURE_2D, 1, storageFormat, size.width(), size.height()));
-    } else
-        GLC(context3d, context3d->texImage2D(GL_TEXTURE_2D, 0, format, size.width(), size.height(), 0, format, GL_UNSIGNED_BYTE, 0));
 
     ResourceId id = m_nextId++;
     Resource resource(textureId, size, format, GL_LINEAR);
+    resource.allocated = false;
     m_resources[id] = resource;
     return id;
 }
 
 ResourceProvider::ResourceId ResourceProvider::createBitmap(const gfx::Size& size)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
 
     uint8_t* pixels = new uint8_t[size.width() * size.height() * 4];
 
     ResourceId id = m_nextId++;
     Resource resource(pixels, size, GL_RGBA, GL_LINEAR);
+    resource.allocated = true;
     m_resources[id] = resource;
     return id;
 }
 
 ResourceProvider::ResourceId ResourceProvider::createResourceFromExternalTexture(unsigned textureId)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
 
     WebGraphicsContext3D* context3d = m_outputSurface->Context3D();
     DCHECK(context3d);
     GLC(context3d, context3d->bindTexture(GL_TEXTURE_2D, textureId));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
     GLC(context3d, context3d->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
 
     ResourceId id = m_nextId++;
     Resource resource(textureId, gfx::Size(), 0, GL_LINEAR);
     resource.external = true;
+    resource.allocated = true;
     m_resources[id] = resource;
     return id;
 }
 
 void ResourceProvider::deleteResource(ResourceId id)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
     ResourceMap::iterator it = m_resources.find(id);
     CHECK(it != m_resources.end());
     Resource* resource = &it->second;
@@ skipping 47 matching lines @@
     DCHECK(m_threadChecker.CalledOnValidThread());
     ResourceMap::iterator it = m_resources.find(id);
     CHECK(it != m_resources.end());
     Resource* resource = &it->second;
     DCHECK(!resource->lockedForWrite);
     DCHECK(!resource->lockForReadCount);
     DCHECK(!resource->external);
     DCHECK(!resource->exported);
 
     if (resource->glId) {
+        DCHECK(!resource->pendingSetPixels);
         WebGraphicsContext3D* context3d = m_outputSurface->Context3D();
         DCHECK(context3d);
         DCHECK(m_textureUploader.get());
         context3d->bindTexture(GL_TEXTURE_2D, resource->glId);
+        lazyAllocateTexture(context3d, resource);
         m_textureUploader->upload(image,
                                   imageRect,
                                   sourceRect,
                                   destOffset,
                                   resource->format,
                                   resource->size);
     }
 
     if (resource->pixels) {
+        DCHECK(resource->allocated);
         DCHECK(resource->format == GL_RGBA);
         SkBitmap srcFull;
         srcFull.setConfig(SkBitmap::kARGB_8888_Config, imageRect.width(), imageRect.height());
         srcFull.setPixels(const_cast<uint8_t*>(image));
         SkBitmap srcSubset;
         SkIRect skSourceRect = SkIRect::MakeXYWH(sourceRect.x(), sourceRect.y(), sourceRect.width(), sourceRect.height());
         skSourceRect.offset(-imageRect.x(), -imageRect.y());
         srcFull.extractSubset(&srcSubset, skSourceRect);
 
         ScopedWriteLockSoftware lock(this, id);
@@ skipping 54 matching lines @@
 }
 
 const ResourceProvider::Resource* ResourceProvider::lockForRead(ResourceId id)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
     ResourceMap::iterator it = m_resources.find(id);
     CHECK(it != m_resources.end());
     Resource* resource = &it->second;
     DCHECK(!resource->lockedForWrite);
     DCHECK(!resource->exported);
+    DCHECK(resource->allocated);
     resource->lockForReadCount++;
     return resource;
 }
 
 void ResourceProvider::unlockForRead(ResourceId id)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
     ResourceMap::iterator it = m_resources.find(id);
     CHECK(it != m_resources.end());
     Resource* resource = &it->second;
@@ skipping 241 matching lines @@
     }
     Child& childInfo = m_children.find(child)->second;
     for (TransferableResourceArray::const_iterator it = resources.resources.begin(); it != resources.resources.end(); ++it) {
         unsigned textureId;
         GLC(context3d, textureId = context3d->createTexture());
         GLC(context3d, context3d->bindTexture(GL_TEXTURE_2D, textureId));
         GLC(context3d, context3d->consumeTextureCHROMIUM(GL_TEXTURE_2D, it->mailbox.name));
         ResourceId id = m_nextId++;
         Resource resource(textureId, it->size, it->format, it->filter);
         resource.mailbox.setName(it->mailbox.name);
+        // Don't allocate a texture for a child.
+        resource.allocated = true;
         m_resources[id] = resource;
         childInfo.parentToChildMap[id] = it->id;
         childInfo.childToParentMap[it->id] = id;
     }
 }
 
 void ResourceProvider::receiveFromParent(const TransferableResourceList& resources)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
     WebGraphicsContext3D* context3d = m_outputSurface->Context3D();
@@ skipping 20 matching lines @@
 bool ResourceProvider::transferResource(WebGraphicsContext3D* context, ResourceId id, TransferableResource* resource)
 {
     DCHECK(m_threadChecker.CalledOnValidThread());
     WebGraphicsContext3D* context3d = m_outputSurface->Context3D();
     ResourceMap::iterator it = m_resources.find(id);
     CHECK(it != m_resources.end());
     Resource* source = &it->second;
     DCHECK(!source->lockedForWrite);
     DCHECK(!source->lockForReadCount);
     DCHECK(!source->external);
+    DCHECK(source->allocated);
     if (source->exported)
         return false;
     resource->id = id;
     resource->format = source->format;
     resource->filter = source->filter;
     resource->size = source->size;
 
     if (source->mailbox.isZero()) {
       GLbyte name[GL_MAILBOX_SIZE_CHROMIUM];
       GLC(context3d, context3d->genMailboxCHROMIUM(name));
@@ skipping 133 matching lines @@
     DCHECK(!resource->lockedForWrite);
     DCHECK(!resource->lockForReadCount);
     DCHECK(!resource->external);
     DCHECK(!resource->exported);
 
     if (resource->glId) {
         WebGraphicsContext3D* context3d = m_outputSurface->Context3D();
         DCHECK(context3d);
         DCHECK(resource->glPixelBufferId);
         context3d->bindTexture(GL_TEXTURE_2D, resource->glId);
+        lazyAllocateTexture(context3d, resource);
+
         context3d->bindBuffer(
             GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM,
             resource->glPixelBufferId);
         context3d->texSubImage2D(GL_TEXTURE_2D,
                                  0, /* level */
                                  0, /* x */
                                  0, /* y */
                                  resource->size.width(),
                                  resource->size.height(),
                                  resource->format,
@@ skipping 51 matching lines @@
         DCHECK(resource->glPixelBufferId);
         context3d->bindTexture(GL_TEXTURE_2D, resource->glId);
         context3d->bindBuffer(
             GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM,
             resource->glPixelBufferId);
         if (!resource->glUploadQueryId)
             resource->glUploadQueryId = context3d->createQueryEXT();
         context3d->beginQueryEXT(
             GL_ASYNC_PIXEL_TRANSFERS_COMPLETED_CHROMIUM,
             resource->glUploadQueryId);
-        context3d->asyncTexSubImage2DCHROMIUM(GL_TEXTURE_2D,
-                                              0, /* level */
-                                              0, /* x */
-                                              0, /* y */
-                                              resource->size.width(),
-                                              resource->size.height(),
-                                              resource->format,
-                                              GL_UNSIGNED_BYTE,
-                                              NULL);
+        if (!resource->allocated) {
+          resource->allocated = true;
+          context3d->asyncTexImage2DCHROMIUM(GL_TEXTURE_2D,
+                                             0, /* level */
+                                             resource->format,
+                                             resource->size.width(),
+                                             resource->size.height(),
+                                             0, /* border */
+                                             resource->format,
+                                             GL_UNSIGNED_BYTE,
+                                             NULL);
+        } else {
+          context3d->asyncTexSubImage2DCHROMIUM(GL_TEXTURE_2D,
+                                                0, /* level */
+                                                0, /* x */
+                                                0, /* y */
+                                                resource->size.width(),
+                                                resource->size.height(),
+                                                resource->format,
+                                                GL_UNSIGNED_BYTE,
+                                                NULL);
+        }
         context3d->endQueryEXT(GL_ASYNC_PIXEL_TRANSFERS_COMPLETED_CHROMIUM);
         context3d->bindBuffer(GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM, 0);
     }
 
     if (resource->pixels)
       setPixelsFromBuffer(id);
 
     resource->pendingSetPixels = true;
 }
 
@@ skipping 17 matching lines @@
         if (!complete)
             return false;
     }
 
     resource->pendingSetPixels = false;
     unlockForWrite(id);
 
     return true;
 }
 
+void ResourceProvider::lazyAllocateTexture(WebGraphicsContext3D* context3d, Resource* resource) {
+    DCHECK(context3d);
+    DCHECK(resource);
+    DCHECK(resource->glId);
+    if (!resource->allocated) {

[piman, 2012/12/18 04:12:34]

nit:
if (resource->allocated)
    return;

saves indentation below and clearly indicates the laziness aspect.

[epenner, 2012/12/18 04:23:52]

Good point. Didn't double-check my cut/paste.

Done.

+        resource->allocated = true;
+        gfx::Size& size = resource->size;
+        GLenum format = resource->format;
+        if (m_useTextureStorageExt && isTextureFormatSupportedForStorage(format)) {
+            GLenum storageFormat = textureToStorageFormat(format);
+            GLC(context3d, context3d->texStorage2DEXT(GL_TEXTURE_2D, 1, storageFormat, size.width(), size.height()));
+        } else
+            GLC(context3d, context3d->texImage2D(GL_TEXTURE_2D, 0, format, size.width(), size.height(), 0, format, GL_UNSIGNED_BYTE, 0));
+    }
+}
+
+
 }  // namespace cc