mirror of
https://github.com/TorqueGameEngines/Torque3D.git
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74 lines
3.2 KiB
C++
74 lines
3.2 KiB
C++
//-----------------------------------------------------------------------------
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// Copyright (c) 2012 GarageGames, LLC
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//-----------------------------------------------------------------------------
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#include "platform/platform.h"
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#include "T3D/decal/decalInstance.h"
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#include "scene/sceneRenderState.h"
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void DecalInstance::getWorldMatrix( MatrixF *outMat, bool flip )
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{
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outMat->setPosition( mPosition );
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Point3F fvec;
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mCross( mNormal, mTangent, &fvec );
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outMat->setColumn( 0, mTangent );
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outMat->setColumn( 1, fvec );
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outMat->setColumn( 2, mNormal );
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}
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F32 DecalInstance::calcPixelSize( U32 viewportHeight, const Point3F &cameraPos, F32 worldToScreenScaleY ) const
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{
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// If fadeStartPixelSize is set less than zero this is interpreted to mean
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// pixelSize based fading is disabled and the decal always renders.
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// Returning a value of F32_MAX should be treated by the caller as
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// meaning "big enough to render at normal quality, dont LOD me.".
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if ( mDataBlock->fadeStartPixelSize < 0.0f )
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return F32_MAX;
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// This is an approximation since mSize is actually the xyz size of the
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// cube we use to clip geometry for the decal. In this case we are assuming
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// it is appropriate to use the radius of the sphere 'inscribed' in that
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// cube as the equivalent of mShape->radius for purposes of calculating
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// the pixelScale ( see TSShapeInstance::setDetailFromDistance ).
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const F32 radius = mSize * 0.5f;
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// Approximate distance to the decal.
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const F32 distance = ( cameraPos - mPosition ).len() - radius;
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// We are inside the decal's volume. There is no useful pixelSize for us
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// to return, it is essentially the entire screen.
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if ( distance <= 0.0f )
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return F32_MAX;
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// Lod is relative to a viewport with a heigh of 300. Could prescale this into decalSize...
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const F32 pixelScale = viewportHeight / 300.0f;
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// Inline of SceneState::projectRadius.
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const F32 pixelSize = mSize / distance * worldToScreenScaleY * pixelScale;
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// Optionally scale pixelSize by a detail adjust value here...
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// eg. pixelSize *= TSDetailAdjust...
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return pixelSize;
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}
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