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axmol/cocos/2d/CCClippingNode.cpp

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/*
* Copyright (c) 2012 Pierre-David Bélanger
* Copyright (c) 2012 cocos2d-x.org
* Copyright (c) 2013-2014 Chukong Technologies Inc.
*
* cocos2d-x: http://www.cocos2d-x.org
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "2d/CCClippingNode.h"
#include "2d/CCDrawingPrimitives.h"
#include "renderer/CCGLProgramCache.h"
#include "renderer/ccGLStateCache.h"
#include "renderer/CCRenderer.h"
#include "renderer/CCRenderState.h"
#include "base/CCDirector.h"
#include "base/CCStencilStateManager.hpp"
#if (CC_TARGET_PLATFORM == CC_PLATFORM_MAC || CC_TARGET_PLATFORM == CC_PLATFORM_WIN32 || CC_TARGET_PLATFORM == CC_PLATFORM_LINUX)
#define CC_CLIPPING_NODE_OPENGLES 0
#else
#define CC_CLIPPING_NODE_OPENGLES 1
#endif
NS_CC_BEGIN
#if CC_CLIPPING_NODE_OPENGLES
static void setProgram(Node *n, GLProgram *p)
{
n->setGLProgram(p);
auto& children = n->getChildren();
for(const auto &child : children) {
setProgram(child, p);
}
}
#endif
ClippingNode::ClippingNode()
: _stencil(nullptr)
,_stencilStateManager(new StencilStateManager())
{
}
ClippingNode::~ClippingNode()
{
if (_stencil)
{
_stencil->stopAllActions();
_stencil->release();
}
CC_SAFE_DELETE(_stencilStateManager);
}
ClippingNode* ClippingNode::create()
{
ClippingNode *ret = new (std::nothrow) ClippingNode();
if (ret && ret->init())
{
ret->autorelease();
}
else
{
CC_SAFE_DELETE(ret);
}
return ret;
}
ClippingNode* ClippingNode::create(Node *pStencil)
{
ClippingNode *ret = new (std::nothrow) ClippingNode();
if (ret && ret->init(pStencil))
{
ret->autorelease();
}
else
{
CC_SAFE_DELETE(ret);
}
return ret;
}
bool ClippingNode::init()
{
return init(nullptr);
}
bool ClippingNode::init(Node *stencil)
{
setStencil(stencil);
return true;
}
void ClippingNode::onEnter()
{
#if CC_ENABLE_SCRIPT_BINDING
if (_scriptType == kScriptTypeJavascript)
{
if (ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnEnter))
return;
}
#endif
Node::onEnter();
if (_stencil != nullptr)
{
_stencil->onEnter();
}
else
{
CCLOG("ClippingNode warning: _stencil is nil.");
}
}
void ClippingNode::onEnterTransitionDidFinish()
{
#if CC_ENABLE_SCRIPT_BINDING
if (_scriptType == kScriptTypeJavascript)
{
if (ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnEnterTransitionDidFinish))
return;
}
#endif
Node::onEnterTransitionDidFinish();
if (_stencil != nullptr)
{
_stencil->onEnterTransitionDidFinish();
}
}
void ClippingNode::onExitTransitionDidStart()
{
#if CC_ENABLE_SCRIPT_BINDING
if (_scriptType == kScriptTypeJavascript)
{
if (ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnExitTransitionDidStart))
return;
}
#endif
if (_stencil != nullptr)
{
_stencil->onExitTransitionDidStart();
}
Node::onExitTransitionDidStart();
}
void ClippingNode::onExit()
{
#if CC_ENABLE_SCRIPT_BINDING
if (_scriptType == kScriptTypeJavascript)
{
if (ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnExit))
return;
}
#endif
if (_stencil != nullptr)
{
_stencil->onExit();
}
Node::onExit();
}
void ClippingNode::visit(Renderer *renderer, const Mat4 &parentTransform, uint32_t parentFlags)
{
if (!_visible || !hasContent())
return;
uint32_t flags = processParentFlags(parentTransform, parentFlags);
// IMPORTANT:
// To ease the migration to v3.0, we still support the Mat4 stack,
// but it is deprecated and your code should not rely on it
Director* director = Director::getInstance();
CCASSERT(nullptr != director, "Director is null when setting matrix stack");
director->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, _modelViewTransform);
//Add group command
_groupCommand.init(_globalZOrder);
renderer->addCommand(&_groupCommand);
renderer->pushGroup(_groupCommand.getRenderQueueID());
_beforeVisitCmd.init(_globalZOrder);
_beforeVisitCmd.func = CC_CALLBACK_0(StencilStateManager::onBeforeVisit, _stencilStateManager);
renderer->addCommand(&_beforeVisitCmd);
auto alphaThreshold = this->getAlphaThreshold();
if (alphaThreshold < 1)
{
#if CC_CLIPPING_NODE_OPENGLES
// since glAlphaTest do not exists in OES, use a shader that writes
// pixel only if greater than an alpha threshold
GLProgram *program = GLProgramCache::getInstance()->getGLProgram(GLProgram::SHADER_NAME_POSITION_TEXTURE_ALPHA_TEST_NO_MV);
GLint alphaValueLocation = glGetUniformLocation(program->getProgram(), GLProgram::UNIFORM_NAME_ALPHA_TEST_VALUE);
// set our alphaThreshold
program->use();
program->setUniformLocationWith1f(alphaValueLocation, alphaThreshold);
// we need to recursively apply this shader to all the nodes in the stencil node
// FIXME: we should have a way to apply shader to all nodes without having to do this
setProgram(_stencil, program);
#endif
}
_stencil->visit(renderer, _modelViewTransform, flags);
_afterDrawStencilCmd.init(_globalZOrder);
_afterDrawStencilCmd.func = CC_CALLBACK_0(StencilStateManager::onAfterDrawStencil, _stencilStateManager);
renderer->addCommand(&_afterDrawStencilCmd);
int i = 0;
bool visibleByCamera = isVisitableByVisitingCamera();
if(!_children.empty())
{
sortAllChildren();
// draw children zOrder < 0
for( ; i < _children.size(); i++ )
{
auto node = _children.at(i);
if ( node && node->getLocalZOrder() < 0 )
node->visit(renderer, _modelViewTransform, flags);
else
break;
}
// self draw
if (visibleByCamera)
this->draw(renderer, _modelViewTransform, flags);
for(auto it=_children.cbegin()+i; it != _children.cend(); ++it)
(*it)->visit(renderer, _modelViewTransform, flags);
}
else if (visibleByCamera)
{
this->draw(renderer, _modelViewTransform, flags);
}
_afterVisitCmd.init(_globalZOrder);
_afterVisitCmd.func = CC_CALLBACK_0(StencilStateManager::onAfterVisit, _stencilStateManager);
renderer->addCommand(&_afterVisitCmd);
renderer->popGroup();
director->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
}
void ClippingNode::setCameraMask(unsigned short mask, bool applyChildren)
{
Node::setCameraMask(mask, applyChildren);
if (_stencil)
_stencil->setCameraMask(mask, applyChildren);
}
Node* ClippingNode::getStencil() const
{
return _stencil;
}
void ClippingNode::setStencil(Node *stencil)
{
#if CC_ENABLE_GC_FOR_NATIVE_OBJECTS
auto sEngine = ScriptEngineManager::getInstance()->getScriptEngine();
if (sEngine)
{
if (_stencil)
sEngine->releaseScriptObject(this, _stencil);
if (stencil)
sEngine->retainScriptObject(this, stencil);
}
#endif // CC_ENABLE_GC_FOR_NATIVE_OBJECTS
CC_SAFE_RETAIN(stencil);
CC_SAFE_RELEASE(_stencil);
_stencil = stencil;
}
bool ClippingNode::hasContent() const
{
return _children.size() > 0;
}
GLfloat ClippingNode::getAlphaThreshold() const
{
return _stencilStateManager->getAlphaThreshold();
}
void ClippingNode::setAlphaThreshold(GLfloat alphaThreshold)
{
_stencilStateManager->setAlphaThreshold(alphaThreshold);
}
bool ClippingNode::isInverted() const
{
return _stencilStateManager->isInverted();
}
void ClippingNode::setInverted(bool inverted)
{
_stencilStateManager->setInverted(inverted);
}
NS_CC_END
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