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/*
* Copyright (C) 2012 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER “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 THE COPYRIGHT HOLDER 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.
*/
#ifndef StyleCustomFilterProgram_h
#define StyleCustomFilterProgram_h
#if ENABLE(CSS_SHADERS)
#include "CachedResourceClient.h"
#include "CachedResourceHandle.h"
#include "CachedShader.h"
#include "CustomFilterProgram.h"
#include "StyleShader.h"
#include <wtf/FastAllocBase.h>
namespace WebCore {
// CSS Shaders
class StyleCustomFilterProgram : public CustomFilterProgram, public CachedResourceClient {
WTF_MAKE_FAST_ALLOCATED;
public:
static PassRefPtr<StyleCustomFilterProgram> create(PassRefPtr<StyleShader> vertexShader, PassRefPtr<StyleShader> fragmentShader)
{
return adoptRef(new StyleCustomFilterProgram(vertexShader, fragmentShader));
}
void setVertexShader(PassRefPtr<StyleShader> shader) { m_vertexShader = shader; }
StyleShader* vertexShader() const { return m_vertexShader.get(); }
void setFragmentShader(PassRefPtr<StyleShader> shader) { m_fragmentShader = shader; }
StyleShader* fragmentShader() const { return m_fragmentShader.get(); }
virtual String vertexShaderString() const
{
ASSERT(isLoaded());
return m_cachedVertexShader.get() ? m_cachedVertexShader->shaderString() : String();
}
virtual String fragmentShaderString() const
{
ASSERT(isLoaded());
return m_cachedFragmentShader.get() ? m_cachedFragmentShader->shaderString() : String();
}
virtual bool isLoaded() const
{
// Do not use the CachedResource:isLoaded method here, because it actually means !isLoading(),
// so missing and canceled resources will have isLoaded set to true, even if they are not loaded yet.
return (!m_cachedVertexShader.get() || m_isVertexShaderLoaded)
&& (!m_cachedFragmentShader.get() || m_isFragmentShaderLoaded);
}
virtual void willHaveClients()
{
if (m_vertexShader) {
m_cachedVertexShader = m_vertexShader->cachedShader();
m_cachedVertexShader->addClient(this);
}
if (m_fragmentShader) {
m_cachedFragmentShader = m_fragmentShader->cachedShader();
m_cachedFragmentShader->addClient(this);
}
}
virtual void didRemoveLastClient()
{
if (m_cachedVertexShader.get()) {
m_cachedVertexShader->removeClient(this);
m_cachedVertexShader = 0;
m_isVertexShaderLoaded = false;
}
if (m_cachedFragmentShader.get()) {
m_cachedFragmentShader->removeClient(this);
m_cachedFragmentShader = 0;
m_isFragmentShaderLoaded = false;
}
}
virtual void notifyFinished(CachedResource* resource)
{
if (resource->errorOccurred())
return;
if (resource == m_cachedVertexShader.get())
m_isVertexShaderLoaded = true;
else if (resource == m_cachedFragmentShader.get())
m_isFragmentShaderLoaded = true;
if (isLoaded())
notifyClients();
}
CachedShader* cachedVertexShader() const { return m_vertexShader ? m_vertexShader->cachedShader() : 0; }
CachedShader* cachedFragmentShader() const { return m_fragmentShader ? m_fragmentShader->cachedShader() : 0; }
virtual bool operator==(const CustomFilterProgram& o) const
{
// The following cast is ugly, but StyleCustomFilterProgram is the single implementation of CustomFilterProgram.
const StyleCustomFilterProgram* other = static_cast<const StyleCustomFilterProgram*>(&o);
return cachedVertexShader() == other->cachedVertexShader() && cachedFragmentShader() == other->cachedFragmentShader();
}
private:
StyleCustomFilterProgram(PassRefPtr<StyleShader> vertexShader, PassRefPtr<StyleShader> fragmentShader)
: m_vertexShader(vertexShader)
, m_fragmentShader(fragmentShader)
, m_isVertexShaderLoaded(false)
, m_isFragmentShaderLoaded(false)
{
}
RefPtr<StyleShader> m_vertexShader;
RefPtr<StyleShader> m_fragmentShader;
CachedResourceHandle<CachedShader> m_cachedVertexShader;
CachedResourceHandle<CachedShader> m_cachedFragmentShader;
bool m_isVertexShaderLoaded;
bool m_isFragmentShaderLoaded;
};
} // namespace WebCore
#endif // ENABLE(CSS_SHADERS)
#endif // StyleCustomFilterProgram_h
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