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-rw-r--r--dom/canvas/WebGLBuffer.cpp290
1 files changed, 290 insertions, 0 deletions
diff --git a/dom/canvas/WebGLBuffer.cpp b/dom/canvas/WebGLBuffer.cpp
new file mode 100644
index 000000000..f202c9950
--- /dev/null
+++ b/dom/canvas/WebGLBuffer.cpp
@@ -0,0 +1,290 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLBuffer.h"
+
+#include "GLContext.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "WebGLContext.h"
+#include "WebGLElementArrayCache.h"
+
+namespace mozilla {
+
+WebGLBuffer::WebGLBuffer(WebGLContext* webgl, GLuint buf)
+ : WebGLRefCountedObject(webgl)
+ , mGLName(buf)
+ , mContent(Kind::Undefined)
+ , mUsage(LOCAL_GL_STATIC_DRAW)
+ , mByteLength(0)
+ , mTFBindCount(0)
+ , mNonTFBindCount(0)
+{
+ mContext->mBuffers.insertBack(this);
+}
+
+WebGLBuffer::~WebGLBuffer()
+{
+ DeleteOnce();
+}
+
+void
+WebGLBuffer::SetContentAfterBind(GLenum target)
+{
+ if (mContent != Kind::Undefined)
+ return;
+
+ switch (target) {
+ case LOCAL_GL_ELEMENT_ARRAY_BUFFER:
+ mContent = Kind::ElementArray;
+ if (!mCache) {
+ mCache.reset(new WebGLElementArrayCache);
+ }
+ break;
+
+ case LOCAL_GL_ARRAY_BUFFER:
+ case LOCAL_GL_PIXEL_PACK_BUFFER:
+ case LOCAL_GL_PIXEL_UNPACK_BUFFER:
+ case LOCAL_GL_UNIFORM_BUFFER:
+ case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
+ case LOCAL_GL_COPY_READ_BUFFER:
+ case LOCAL_GL_COPY_WRITE_BUFFER:
+ mContent = Kind::OtherData;
+ break;
+
+ default:
+ MOZ_CRASH("GFX: invalid target");
+ }
+}
+
+void
+WebGLBuffer::Delete()
+{
+ mContext->MakeContextCurrent();
+ mContext->gl->fDeleteBuffers(1, &mGLName);
+ mByteLength = 0;
+ mCache = nullptr;
+ LinkedListElement<WebGLBuffer>::remove(); // remove from mContext->mBuffers
+}
+
+////////////////////////////////////////
+
+static bool
+ValidateBufferUsageEnum(WebGLContext* webgl, const char* funcName, GLenum usage)
+{
+ switch (usage) {
+ case LOCAL_GL_STREAM_DRAW:
+ case LOCAL_GL_STATIC_DRAW:
+ case LOCAL_GL_DYNAMIC_DRAW:
+ return true;
+
+ case LOCAL_GL_DYNAMIC_COPY:
+ case LOCAL_GL_DYNAMIC_READ:
+ case LOCAL_GL_STATIC_COPY:
+ case LOCAL_GL_STATIC_READ:
+ case LOCAL_GL_STREAM_COPY:
+ case LOCAL_GL_STREAM_READ:
+ if (MOZ_LIKELY(webgl->IsWebGL2()))
+ return true;
+ break;
+
+ default:
+ break;
+ }
+
+ webgl->ErrorInvalidEnum("%s: Invalid `usage`: 0x%04x", funcName, usage);
+ return false;
+}
+
+void
+WebGLBuffer::BufferData(GLenum target, size_t size, const void* data, GLenum usage)
+{
+ const char funcName[] = "bufferData";
+
+ // Careful: data.Length() could conceivably be any uint32_t, but GLsizeiptr
+ // is like intptr_t.
+ if (!CheckedInt<GLsizeiptr>(size).isValid())
+ return mContext->ErrorOutOfMemory("%s: bad size", funcName);
+
+ if (!ValidateBufferUsageEnum(mContext, funcName, usage))
+ return;
+
+ const auto& gl = mContext->gl;
+ gl->MakeCurrent();
+ const ScopedLazyBind lazyBind(gl, target, this);
+ mContext->InvalidateBufferFetching();
+
+#ifdef XP_MACOSX
+ // bug 790879
+ if (gl->WorkAroundDriverBugs() &&
+ size > INT32_MAX)
+ {
+ mContext->ErrorOutOfMemory("%s: Allocation size too large.", funcName);
+ return;
+ }
+#endif
+
+ const bool sizeChanges = (size != ByteLength());
+ if (sizeChanges) {
+ gl::GLContext::LocalErrorScope errorScope(*gl);
+ gl->fBufferData(target, size, data, usage);
+ const auto error = errorScope.GetError();
+
+ if (error) {
+ MOZ_ASSERT(error == LOCAL_GL_OUT_OF_MEMORY);
+ mContext->ErrorOutOfMemory("%s: Error from driver: 0x%04x", funcName, error);
+ return;
+ }
+ } else {
+ gl->fBufferData(target, size, data, usage);
+ }
+
+ mUsage = usage;
+ mByteLength = size;
+
+ // Warning: Possibly shared memory. See bug 1225033.
+ if (!ElementArrayCacheBufferData(data, size)) {
+ mByteLength = 0;
+ mContext->ErrorOutOfMemory("%s: Failed update index buffer cache.", funcName);
+ }
+}
+
+bool
+WebGLBuffer::ValidateRange(const char* funcName, size_t byteOffset, size_t byteLen) const
+{
+ auto availLength = mByteLength;
+ if (byteOffset > availLength) {
+ mContext->ErrorInvalidValue("%s: Offset passes the end of the buffer.", funcName);
+ return false;
+ }
+ availLength -= byteOffset;
+
+ if (byteLen > availLength) {
+ mContext->ErrorInvalidValue("%s: Offset+size passes the end of the buffer.",
+ funcName);
+ return false;
+ }
+
+ return true;
+}
+
+////////////////////////////////////////
+
+bool
+WebGLBuffer::ElementArrayCacheBufferData(const void* ptr,
+ size_t bufferSizeInBytes)
+{
+ if (mContext->IsWebGL2())
+ return true;
+
+ if (mContent == Kind::ElementArray)
+ return mCache->BufferData(ptr, bufferSizeInBytes);
+
+ return true;
+}
+
+void
+WebGLBuffer::ElementArrayCacheBufferSubData(size_t pos, const void* ptr,
+ size_t updateSizeInBytes)
+{
+ if (mContext->IsWebGL2())
+ return;
+
+ if (mContent == Kind::ElementArray)
+ mCache->BufferSubData(pos, ptr, updateSizeInBytes);
+}
+
+size_t
+WebGLBuffer::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
+{
+ size_t sizeOfCache = mCache ? mCache->SizeOfIncludingThis(mallocSizeOf)
+ : 0;
+ return mallocSizeOf(this) + sizeOfCache;
+}
+
+bool
+WebGLBuffer::Validate(GLenum type, uint32_t maxAllowed, size_t first, size_t count) const
+{
+ if (mContext->IsWebGL2())
+ return true;
+
+ return mCache->Validate(type, maxAllowed, first, count);
+}
+
+bool
+WebGLBuffer::IsElementArrayUsedWithMultipleTypes() const
+{
+ if (mContext->IsWebGL2())
+ return false;
+
+ return mCache->BeenUsedWithMultipleTypes();
+}
+
+////
+
+bool
+WebGLBuffer::ValidateCanBindToTarget(const char* funcName, GLenum target)
+{
+ /* https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.1
+ *
+ * In the WebGL 2 API, buffers have their WebGL buffer type
+ * initially set to undefined. Calling bindBuffer, bindBufferRange
+ * or bindBufferBase with the target argument set to any buffer
+ * binding point except COPY_READ_BUFFER or COPY_WRITE_BUFFER will
+ * then set the WebGL buffer type of the buffer being bound
+ * according to the table above.
+ *
+ * Any call to one of these functions which attempts to bind a
+ * WebGLBuffer that has the element array WebGL buffer type to a
+ * binding point that falls under other data, or bind a
+ * WebGLBuffer which has the other data WebGL buffer type to
+ * ELEMENT_ARRAY_BUFFER will generate an INVALID_OPERATION error,
+ * and the state of the binding point will remain untouched.
+ */
+
+ if (mContent == WebGLBuffer::Kind::Undefined)
+ return true;
+
+ switch (target) {
+ case LOCAL_GL_COPY_READ_BUFFER:
+ case LOCAL_GL_COPY_WRITE_BUFFER:
+ return true;
+
+ case LOCAL_GL_ELEMENT_ARRAY_BUFFER:
+ if (mContent == WebGLBuffer::Kind::ElementArray)
+ return true;
+ break;
+
+ case LOCAL_GL_ARRAY_BUFFER:
+ case LOCAL_GL_PIXEL_PACK_BUFFER:
+ case LOCAL_GL_PIXEL_UNPACK_BUFFER:
+ case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
+ case LOCAL_GL_UNIFORM_BUFFER:
+ if (mContent == WebGLBuffer::Kind::OtherData)
+ return true;
+ break;
+
+ default:
+ MOZ_CRASH();
+ }
+
+ const auto dataType = (mContent == WebGLBuffer::Kind::OtherData) ? "other"
+ : "element";
+ mContext->ErrorInvalidOperation("%s: Buffer already contains %s data.", funcName,
+ dataType);
+ return false;
+}
+
+JSObject*
+WebGLBuffer::WrapObject(JSContext* cx, JS::Handle<JSObject*> givenProto)
+{
+ return dom::WebGLBufferBinding::Wrap(cx, this, givenProto);
+}
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(WebGLBuffer)
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLBuffer, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLBuffer, Release)
+
+} // namespace mozilla
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