Revert of Consolidate GPU buffer implementations

src/gpu/gl/GrGLBufferImpl.cpp

Index: src/gpu/gl/GrGLBufferImpl.cpp
diff --git a/src/gpu/gl/GrGLBufferImpl.cpp b/src/gpu/gl/GrGLBufferImpl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2babce80285cc1f2bb61e34e657db58b727a7142
--- /dev/null
+++ b/src/gpu/gl/GrGLBufferImpl.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLBufferImpl.h"
+#include "GrGLGpu.h"
+
+#define GL_CALL(GPU, X) GR_GL_CALL(GPU->glInterface(), X)
+
+#ifdef SK_DEBUG
+#define VALIDATE() this->validate()
+#else
+#define VALIDATE() do {} while(false)
+#endif
+
+GrGLBufferImpl::GrGLBufferImpl(GrGLGpu* gpu, const Desc& desc, GrGLenum bufferType)
+    : fDesc(desc)
+    , fBufferType(bufferType)
+    , fMapPtr(nullptr) {
+    if (0 == desc.fID) {
+        if (gpu->caps()->mustClearUploadedBufferData()) {
+            fCPUData = sk_calloc_throw(desc.fSizeInBytes);
+        } else {
+            fCPUData = sk_malloc_flags(desc.fSizeInBytes, SK_MALLOC_THROW);
+        }
+        fGLSizeInBytes = 0;
+    } else {
+        fCPUData = nullptr;
+        // We assume that the GL buffer was created at the desc's size initially.
+        fGLSizeInBytes = fDesc.fSizeInBytes;
+    }
+    VALIDATE();
+}
+
+void GrGLBufferImpl::release(GrGLGpu* gpu) {
+    VALIDATE();
+    // make sure we've not been abandoned or already released
+    if (fCPUData) {
+        sk_free(fCPUData);
+        fCPUData = nullptr;
+    } else if (fDesc.fID) {
+        gpu->releaseBuffer(fDesc.fID, fBufferType);
+        fDesc.fID = 0;
+        fGLSizeInBytes = 0;
+    }
+    fMapPtr = nullptr;
+    VALIDATE();
+}
+
+void GrGLBufferImpl::abandon() {
+    fDesc.fID = 0;
+    fGLSizeInBytes = 0;
+    fMapPtr = nullptr;
+    sk_free(fCPUData);
+    fCPUData = nullptr;
+    VALIDATE();
+}
+
+void* GrGLBufferImpl::map(GrGLGpu* gpu) {
+    VALIDATE();
+    SkASSERT(!this->isMapped());
+    if (0 == fDesc.fID) {
+        fMapPtr = fCPUData;
+    } else {
+        fMapPtr = gpu->mapBuffer(fDesc.fID, fBufferType, fDesc.fUsage, fGLSizeInBytes,
+                                 fDesc.fSizeInBytes);
+        fGLSizeInBytes = fDesc.fSizeInBytes;
+    }
+    VALIDATE();
+    return fMapPtr;
+}
+
+void GrGLBufferImpl::unmap(GrGLGpu* gpu) {
+    VALIDATE();
+    SkASSERT(this->isMapped());
+    if (0 != fDesc.fID) {
+        gpu->unmapBuffer(fDesc.fID, fBufferType, fMapPtr);
+    }
+    fMapPtr = nullptr;
+}
+
+bool GrGLBufferImpl::isMapped() const {
+    VALIDATE();
+    return SkToBool(fMapPtr);
+}
+
+bool GrGLBufferImpl::updateData(GrGLGpu* gpu, const void* src, size_t srcSizeInBytes) {
+    SkASSERT(!this->isMapped());
+    SkASSERT(GR_GL_ARRAY_BUFFER == fBufferType || GR_GL_ELEMENT_ARRAY_BUFFER == fBufferType);
+    VALIDATE();
+    if (srcSizeInBytes > fDesc.fSizeInBytes) {
+        return false;
+    }
+    if (0 == fDesc.fID) {
+        memcpy(fCPUData, src, srcSizeInBytes);
+        return true;
+    }
+    gpu->bufferData(fDesc.fID, fBufferType, fDesc.fUsage, fDesc.fSizeInBytes, src,
+                    srcSizeInBytes);
+#if GR_GL_USE_BUFFER_DATA_NULL_HINT
+    fGLSizeInBytes = fDesc.fSizeInBytes;
+#else
+    fGLSizeInBytes = srcSizeInBytes;
+#endif
+    VALIDATE();
+    return true;
+}
+
+void GrGLBufferImpl::validate() const {
+    SkASSERT(GR_GL_ARRAY_BUFFER == fBufferType || GR_GL_ELEMENT_ARRAY_BUFFER == fBufferType ||
+             GR_GL_PIXEL_PACK_BUFFER == fBufferType || GR_GL_PIXEL_UNPACK_BUFFER == fBufferType ||
+             GR_GL_PIXEL_PACK_TRANSFER_BUFFER_CHROMIUM == fBufferType ||
+             GR_GL_PIXEL_UNPACK_TRANSFER_BUFFER_CHROMIUM == fBufferType);
+    // The following assert isn't valid when the buffer has been abandoned:
+    // SkASSERT((0 == fDesc.fID) == (fCPUData));
+    SkASSERT(nullptr == fCPUData || 0 == fGLSizeInBytes);
+    SkASSERT(nullptr == fMapPtr || fCPUData || fGLSizeInBytes <= fDesc.fSizeInBytes);
+    SkASSERT(nullptr == fCPUData || nullptr == fMapPtr || fCPUData == fMapPtr);
+}