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/*
* Copyright (C) 2021 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 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 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.
*/
#pragma once
#include "WebGLExtension.h"
#include <JavaScriptCore/TypedArrays.h>
namespace WebCore {
class WebGLMultiDraw final : public WebGLExtension {
WTF_MAKE_ISO_ALLOCATED(WebGLMultiDraw);
private:
template <class TypedArray, class DataType>
class TypedList {
public:
using ListTypeOptions = std::variant<RefPtr<TypedArray>, Vector<DataType>>;
TypedList(ListTypeOptions&& variant)
: m_variant(WTFMove(variant))
{
}
const DataType* data() const
{
return WTF::switchOn(m_variant,
[] (const RefPtr<TypedArray>& typedArray) -> const DataType* { return typedArray->data(); },
[] (const Vector<DataType>& vector) -> const DataType* { return vector.data(); }
);
}
GCGLsizei length() const
{
return WTF::switchOn(m_variant,
[] (const RefPtr<TypedArray>& typedArray) -> GCGLsizei { return typedArray->length(); },
[] (const Vector<DataType>& vector) -> GCGLsizei { return vector.size(); }
);
}
private:
ListTypeOptions m_variant;
};
public:
using Int32List = TypedList<Int32Array, int32_t>;
explicit WebGLMultiDraw(WebGLRenderingContextBase&);
virtual ~WebGLMultiDraw();
ExtensionName getName() const override;
static bool supported(GraphicsContextGL&);
void multiDrawArraysWEBGL(GCGLenum mode, Int32List firstsList, GCGLuint firstsOffset, Int32List countsList, GCGLuint countsOffset, GCGLsizei drawcount);
void multiDrawElementsWEBGL(GCGLenum mode, Int32List countsList, GCGLuint countsOffset, GCGLenum type, Int32List offsetsList, GCGLuint offsetsOffset, GCGLsizei drawcount);
void multiDrawArraysInstancedWEBGL(GCGLenum mode, Int32List firstsList, GCGLuint firstsOffset, Int32List countsList, GCGLuint countsOffset, Int32List instanceCountsList, GCGLuint instanceCountsOffset, GCGLsizei drawcount);
void multiDrawElementsInstancedWEBGL(GCGLenum mode, Int32List countsList, GCGLuint countsOffset, GCGLenum type, Int32List offsetsList, GCGLuint offsetsOffset, Int32List instanceCountsList, GCGLuint instanceCountsOffset, GCGLsizei drawcount);
private:
bool validateDrawcount(const char* functionName, GCGLsizei drawcount);
bool validateOffset(const char* functionName, const char* outOfBoundsDescription, GCGLsizei, GCGLuint offset, GCGLsizei drawcount);
};
} // namespace WebCore
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