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/*
* Copyright (C) 2009-2021 Apple 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. ``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
* 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.
*/
#pragma once
#if ENABLE(WEBGL)
#include "WebGLObject.h"
#include <variant>
#include <wtf/HashMap.h>
#include <wtf/RefCounted.h>
#include <wtf/Vector.h>
namespace JSC {
class AbstractSlotVisitor;
}
namespace WTF {
class AbstractLocker;
}
namespace WebCore {
class WebGLRenderbuffer;
class WebGLTexture;
class WebGLFramebuffer final : public WebGLObject {
public:
virtual ~WebGLFramebuffer();
static RefPtr<WebGLFramebuffer> create(WebGLRenderingContextBase&);
#if ENABLE(WEBXR)
static RefPtr<WebGLFramebuffer> createOpaque(WebGLRenderingContextBase&);
#endif
struct TextureAttachment {
RefPtr<WebGLTexture> texture;
GCGLenum texTarget;
GCGLint level;
friend bool operator==(const TextureAttachment&, const TextureAttachment&) = default;
};
struct TextureLayerAttachment {
RefPtr<WebGLTexture> texture;
GCGLint level;
GCGLint layer;
friend bool operator==(const TextureLayerAttachment&, const TextureLayerAttachment&) = default;
};
using AttachmentEntry = std::variant<RefPtr<WebGLRenderbuffer>, TextureAttachment, TextureLayerAttachment>;
void setAttachmentForBoundFramebuffer(GCGLenum target, GCGLenum attachment, AttachmentEntry);
// Below are nonnull. RefPtr instead of Ref due to call site object identity
// purposes, call site uses i.e pointer operator==.
using AttachmentObject = std::variant<RefPtr<WebGLRenderbuffer>, RefPtr<WebGLTexture>>;
// If an object is attached to the currently bound framebuffer, remove it.
void removeAttachmentFromBoundFramebuffer(const AbstractLocker&, GCGLenum target, AttachmentObject);
std::optional<AttachmentObject> getAttachmentObject(GCGLenum) const;
void didBind() { m_hasEverBeenBound = true; }
// Wrapper for drawBuffersEXT/drawBuffersARB to work around a driver bug.
void drawBuffers(const Vector<GCGLenum>& bufs);
GCGLenum getDrawBuffer(GCGLenum);
void addMembersToOpaqueRoots(const AbstractLocker&, JSC::AbstractSlotVisitor&);
#if ENABLE(WEBXR)
bool isOpaque() const { return m_isOpaque; }
#endif
bool isUsable() const { return object() && !isDeleted(); }
bool isInitialized() const { return m_hasEverBeenBound; }
private:
enum class Type : bool {
Plain,
#if ENABLE(WEBXR)
Opaque
#endif
};
WebGLFramebuffer(WebGLRenderingContextBase&, PlatformGLObject, Type);
void deleteObjectImpl(const AbstractLocker&, GraphicsContextGL*, PlatformGLObject) override;
// If a given attachment point for the currently bound framebuffer is not null, remove the attached object.
void removeAttachmentFromBoundFramebuffer(const AbstractLocker&, GCGLenum target, GCGLenum attachment);
// Check if the framebuffer is currently bound to the given target.
bool isBound(GCGLenum target) const;
// Check if a new drawBuffers call should be issued. This is called when we add or remove an attachment.
void drawBuffersIfNecessary(bool force);
void setAttachmentInternal(GCGLenum attachment, AttachmentEntry);
// If a given attachment point for the currently bound framebuffer is not
// null, remove the attached object.
void removeAttachmentInternal(const AbstractLocker&, GCGLenum attachment);
UncheckedKeyHashMap<GCGLenum, AttachmentEntry> m_attachments;
bool m_hasEverBeenBound { false };
Vector<GCGLenum> m_drawBuffers;
Vector<GCGLenum> m_filteredDrawBuffers;
#if ENABLE(WEBXR)
const bool m_isOpaque;
#endif
};
} // namespace WebCore
#endif
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