cocos-enhance-kit/cocos2d-x/cocos/renderer/renderer/Light.cpp

/****************************************************************************
 Copyright (c) 2018 Xiamen Yaji Software Co., Ltd.

 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
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 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,
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 THE SOFTWARE.
 ****************************************************************************/

#include "Light.h"
#include <new>
#include "gfx/DeviceGraphics.h"
#include "gfx/Texture2D.h"
#include "gfx/RenderBuffer.h"
#include "gfx/FrameBuffer.h"

RENDERER_BEGIN

Light::Light()
{
    _worldRT = Mat4();
}

Light::~Light()
{
    RENDERER_SAFE_RELEASE(_shadowFrameBuffer);
    RENDERER_SAFE_RELEASE(_shadowDepthBuffer);
    RENDERER_SAFE_RELEASE(_node);
    RENDERER_SAFE_RELEASE(_shadowMap);
}

void Light::setColor(float r, float g, float b)
{
    _color.set(r, g, b);
    _colorUniform.set(r * _intensity, g * _intensity, b * _intensity);
}

void Light::setIntensity(float val)
{
    _intensity = val;
    _colorUniform.set(_color.r * _intensity,
                      _color.g * _intensity,
                      _color.b * _intensity);
}

void Light::setSpotAngle(float val)
{
    _spotAngle = val;
    _spotUniform[0] = std::cos(_spotAngle * 0.5f);
}

void Light::setSpotExp(float val)
{
    _spotExp = val;
    _spotUniform[1] = _spotExp;
}

void Light::setShadowType(ShadowType val)
{
    if (ShadowType::NONE == _shadowType &&
        ShadowType::NONE != val)
    {
        _shadowMapDirty = true;
    }
    
    _shadowType = val;
}

void Light::setShadowResolution(uint32_t val)
{
    if (_shadowResolution != val)
    {
        _shadowMapDirty = true;
        _shadowResolution = val;
    }
}

float Light::getShadowMinDepth() const
{
    if (LightType::DIRECTIONAL == _type)
        return 1.0f;
    else
        return _shadowMinDepth;
}

float Light::getShadowMaxDepth() const
{
    if (LightType::DIRECTIONAL == _type)
        return 1.0f;
    else
        return _shadowMaxDepth;
}

void Light::setWorldMatrix(const Mat4& worldMatrix)
{
    _worldMatrix = worldMatrix;
    Quaternion rotation;
    Vec3 translation;
    _worldMatrix.decompose(nullptr, &rotation, &translation);
    Mat4::createRotation(rotation, &_worldRT);
    _worldRT.translate(translation);
}

void Light::setNode(NodeProxy* node)
{
    if (_node == node)
    {
        return;
    }
    
    if (_node != nullptr)
    {
        _node->release();
    }
    _node = node;
    if (_node != nullptr)
    {
        _node->retain();
    }
}

void Light::extractView(View& out, const std::vector<std::string>& stages)
{
    out.shadowLight = const_cast<Light*>(this);
    out.rect = { 0, 0, (float)_shadowResolution, (float)_shadowResolution };
    
    // clear options
    out.color.set(1.f, 1.f, 1.f, 1.f);
    out.depth = 1;
    out.stencil = 1;
    out.clearFlags = ClearFlag::COLOR | ClearFlag::DEPTH;
    
    // stage & framebuffer
    out.stages = stages;
    out.frameBuffer = _shadowFrameBuffer;
    
    // view projection matrix
    switch (_type)
    {
        case LightType::SPOT:
            computeSpotLightViewProjMatrix(out.matView, out.matProj);
            break;
        case LightType::DIRECTIONAL:
            computeDirectionalLightViewProjMatrix(out.matView, out.matProj);
            break;
        case LightType::POINT:
            computePointLightViewProjMatrix(out.matView, out.matProj);
            break;
        case LightType::AMBIENT:
            break;
        default:
            RENDERER_LOGW("Shadow of this light type is not supported");
            break;
    }
    
    // view-porjection
    Mat4::multiply(out.matProj, out.matView, &out.matViewProj);
    out.matInvViewProj = out.matViewProj.getInversed();
    
    _viewProjMatrix.set(out.matViewProj);
    
    out.cullingMask = 0xffffffff;
}

void Light::update(DeviceGraphics* device)
{
    updateLightPositionAndDirection();
    
    if (ShadowType::NONE == _shadowType)
        destroyShadowMap();
    else
    {
        destroyShadowMap();
        generateShadowMap(device);
        _shadowMapDirty = false;
    }
}

// private functions

void Light::updateLightPositionAndDirection()
{
    _worldMatrix = _node->getWorldMatrix();
    _worldMatrix.transformVector(_forward, &_directionUniform);
    _positionUniform.set(_worldMatrix.m[12], _worldMatrix.m[13], _worldMatrix.m[14]);
}

void Light::generateShadowMap(DeviceGraphics* device)
{
    _shadowMap = new (std::nothrow) Texture2D();
    if (!_shadowMap)
        return;
    
    _shadowDepthBuffer = new (std::nothrow) RenderBuffer();
    if (!_shadowDepthBuffer)
    {
        _shadowMap->release();
        _shadowMap = nullptr;
        
        return;
    }
    
    _shadowFrameBuffer = new (std::nothrow) FrameBuffer();
    if (!_shadowFrameBuffer)
    {
        _shadowMap->release();
        _shadowDepthBuffer->release();
        _shadowMap = nullptr;
        _shadowDepthBuffer = nullptr;
        
        return;
    }
    
    Texture2D::Options options;
    options.width = _shadowResolution;
    options.height = _shadowResolution;
    options.glFormat = GL_RGBA;
    options.wrapS = Texture2D::WrapMode::CLAMP;
    options.wrapT = Texture2D::WrapMode::CLAMP;
    _shadowMap->init(device, options);
    
    _shadowDepthBuffer->init(device, RenderBuffer::Format::D16, _shadowResolution, _shadowResolution);
    
    _shadowFrameBuffer->init(device, _shadowResolution, _shadowResolution);
    _shadowFrameBuffer->setColorBuffer(_shadowMap, 0);
    _shadowFrameBuffer->setDepthBuffer(_shadowDepthBuffer);
}

void Light::destroyShadowMap()
{
    if (_shadowMap)
    {
        _shadowMap->release();
        _shadowMap = nullptr;
        
        RENDERER_SAFE_RELEASE(_shadowDepthBuffer);
        _shadowDepthBuffer = nullptr;
        
        RENDERER_SAFE_RELEASE(_shadowFrameBuffer);
        _shadowFrameBuffer = nullptr;
    }
}

void Light::computeSpotLightViewProjMatrix(Mat4& matView, Mat4& matProj) const
{
    // view matrix
    _node->getWorldRT(&(const_cast<Light*>(this)->_worldRT));
    matView = _worldRT.getInversed();
    
    // proj matrix
    Mat4::createPerspective(_spotAngle * _spotAngleScale / 3.1415926 * 180,
                            1,
                            _shadowMinDepth,
                            _shadowMaxDepth,
                            &matProj);
}

void Light::computeDirectionalLightViewProjMatrix(Mat4& matView, Mat4& matProj) const
{
    // view matrix
    _node->getWorldRT(&(const_cast<Light*>(this)->_worldRT));
    matView = _worldRT.getInversed();
    
    // proj matrix
    float halfSize = _shadowFustumSize / 2;
    Mat4::createOrthographic(-halfSize, halfSize, -halfSize, halfSize, _shadowMinDepth, _shadowMaxDepth, &matProj);
}

void Light::computePointLightViewProjMatrix(Mat4& matView, Mat4& matProj) const
{
    //REFINE
}

RENDERER_END