226 lines
8.0 KiB
GLSL
226 lines
8.0 KiB
GLSL
/*
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-----------------------------------------------------------------------------
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This source file is part of OGRE
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(Object-oriented Graphics Rendering Engine)
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For the latest info, see http://www.ogre3d.org
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Copyright (c) 2000-2013 Torus Knot Software Ltd
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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 deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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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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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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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 FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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-----------------------------------------------------------------------------
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*/
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//-----------------------------------------------------------------------------
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// Program Name: FFPLib_Lighting
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// Program Desc: Lighting functions of the FFP.
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// Program Type: Vertex shader
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// Language: GLSL
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// Notes: Implements core functions for FFPLighting class.
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// based on lighting engine.
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// See http://msdn.microsoft.com/en-us/library/bb147178.aspx
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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void FFP_Light_Directional_Diffuse(in mat4 mWorldViewIT,
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in vec3 vNormal,
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in vec3 vNegLightDirView,
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in vec3 vDiffuseColour,
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in vec3 vBaseColour,
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out vec3 vOut)
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{
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vec3 vNormalView = normalize((mWorldViewIT * vec4(vNormal.xyz, 1.0)).xyz);
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float nDotL = dot(vNormalView, vNegLightDirView);
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vOut = vBaseColour + vDiffuseColour * clamp(nDotL, 0.0, 1.0);
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}
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//-----------------------------------------------------------------------------
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void FFP_Light_Directional_DiffuseSpecular(in mat4 mWorldView,
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in vec4 vPos,
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in mat4 mWorldViewIT,
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in vec3 vNormal,
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in vec3 vNegLightDirView,
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in vec3 vDiffuseColour,
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in vec3 vSpecularColour,
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in float fSpecularPower,
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in vec3 vBaseDiffuseColour,
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in vec3 vBaseSpecularColour,
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out vec3 vOutDiffuse,
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out vec3 vOutSpecular)
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{
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vOutDiffuse = vBaseDiffuseColour;
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vOutSpecular = vBaseSpecularColour;
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vec3 vNormalView = normalize((mWorldViewIT * vec4(vNormal.xyz, 1.0)).xyz);
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float nDotL = dot(vNormalView, vNegLightDirView);
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vec3 vView = -normalize((mWorldView* vPos).xyz);
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vec3 vHalfWay = normalize(vView + vNegLightDirView);
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float nDotH = dot(vNormalView, vHalfWay);
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if (nDotL > 0.0)
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{
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vOutDiffuse += vDiffuseColour * nDotL;
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vOutSpecular += vSpecularColour * pow(clamp(nDotH, 0.0, 1.0), fSpecularPower);
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}
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}
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//-----------------------------------------------------------------------------
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void FFP_Light_Point_Diffuse(in mat4 mWorldView,
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in vec4 vPos,
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in mat4 mWorldViewIT,
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in vec3 vNormal,
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in vec3 vLightPosView,
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in vec4 vAttParams,
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in vec3 vDiffuseColour,
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in vec3 vBaseColour,
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out vec3 vOut)
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{
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vOut = vBaseColour;
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vec3 vViewPos = (mWorldView * vPos).xyz;
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vec3 vLightView = vLightPosView - vViewPos;
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float fLightD = length(vLightView);
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vec3 vNormalView = normalize((mWorldViewIT * vec4(vNormal.xyz, 1.0)).xyz);
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float nDotL = dot(vNormalView, normalize(vLightView));
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if (nDotL > 0.0 && fLightD <= vAttParams.x)
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{
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float fAtten = 1.0 / (vAttParams.y + vAttParams.z*fLightD + vAttParams.w*fLightD*fLightD);
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vOut += vDiffuseColour * nDotL * fAtten;
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}
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}
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//-----------------------------------------------------------------------------
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void FFP_Light_Point_DiffuseSpecular(in mat4 mWorldView,
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in vec4 vPos,
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in mat4 mWorldViewIT,
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in vec3 vNormal,
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in vec3 vLightPosView,
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in vec4 vAttParams,
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in vec3 vDiffuseColour,
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in vec3 vSpecularColour,
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in float fSpecularPower,
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in vec3 vBaseDiffuseColour,
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in vec3 vBaseSpecularColour,
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out vec3 vOutDiffuse,
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out vec3 vOutSpecular)
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{
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vOutDiffuse = vBaseDiffuseColour;
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vOutSpecular = vBaseSpecularColour;
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vec3 vViewPos = (mWorldView * vPos).xyz;
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vec3 vLightView = vLightPosView - vViewPos;
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float fLightD = length(vLightView);
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vLightView = normalize(vLightView);
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vec3 vNormalView = normalize((mWorldViewIT * vec4(vNormal.xyz, 1.0)).xyz);
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float nDotL = dot(vNormalView, vLightView);
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if (nDotL > 0.0 && fLightD <= vAttParams.x)
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{
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vec3 vView = -normalize(vViewPos);
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vec3 vHalfWay = normalize(vView + vLightView);
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float nDotH = dot(vNormalView, vHalfWay);
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float fAtten = 1.0 / (vAttParams.y + vAttParams.z*fLightD + vAttParams.w*fLightD*fLightD);
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vOutDiffuse += vDiffuseColour * nDotL * fAtten;
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vOutSpecular += vSpecularColour * pow(clamp(nDotH, 0.0, 1.0), fSpecularPower) * fAtten;
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}
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}
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//-----------------------------------------------------------------------------
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void FFP_Light_Spot_Diffuse(in mat4 mWorldView,
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in vec4 vPos,
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in mat4 mWorldViewIT,
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in vec3 vNormal,
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in vec3 vLightPosView,
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in vec3 vNegLightDirView,
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in vec4 vAttParams,
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in vec3 vSpotParams,
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in vec3 vDiffuseColour,
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in vec3 vBaseColour,
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out vec3 vOut)
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{
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vOut = vBaseColour;
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vec3 vViewPos = (mWorldView * vPos).xyz;
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vec3 vLightView = vLightPosView - vViewPos;
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float fLightD = length(vLightView);
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vLightView = normalize(vLightView);
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vec3 vNormalView = normalize((mWorldViewIT * vec4(vNormal.xyz, 1.0)).xyz);
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float nDotL = dot(vNormalView, vLightView);
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if (nDotL > 0.0 && fLightD <= vAttParams.x)
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{
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float fAtten = 1.0 / (vAttParams.y + vAttParams.z*fLightD + vAttParams.w*fLightD*fLightD);
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float rho = dot(vNegLightDirView, vLightView);
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float fSpotE = clamp((rho - vSpotParams.y) / (vSpotParams.x - vSpotParams.y), 0.0, 1.0);
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float fSpotT = pow(fSpotE, vSpotParams.z);
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vOut += vDiffuseColour * nDotL * fAtten * fSpotT;
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}
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}
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//-----------------------------------------------------------------------------
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void FFP_Light_Spot_DiffuseSpecular(in mat4 mWorldView,
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in vec4 vPos,
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in mat4 mWorldViewIT,
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in vec3 vNormal,
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in vec3 vLightPosView,
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in vec3 vNegLightDirView,
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in vec4 vAttParams,
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in vec3 vSpotParams,
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in vec3 vDiffuseColour,
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in vec3 vSpecularColour,
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in float fSpecularPower,
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in vec3 vBaseDiffuseColour,
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in vec3 vBaseSpecularColour,
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out vec3 vOutDiffuse,
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out vec3 vOutSpecular)
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{
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vOutDiffuse = vBaseDiffuseColour;
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vOutSpecular = vBaseSpecularColour;
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vec3 vViewPos = (mWorldView * vPos).xyz;
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vec3 vLightView = vLightPosView - vViewPos;
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float fLightD = length(vLightView);
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vLightView = normalize(vLightView);
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vec3 vNormalView = normalize((mWorldViewIT * vec4(vNormal.xyz, 1.0)).xyz);
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float nDotL = dot(vNormalView, vLightView);
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if (nDotL > 0.0 && fLightD <= vAttParams.x)
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{
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vec3 vView = -normalize(vViewPos);
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vec3 vHalfWay = normalize(vView + vLightView);
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float nDotH = dot(vNormalView, vHalfWay);
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float fAtten = 1.0 / (vAttParams.y + vAttParams.z*fLightD + vAttParams.w*fLightD*fLightD);
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float rho = dot(vNegLightDirView, vLightView);
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float fSpotE = clamp((rho - vSpotParams.y) / (vSpotParams.x - vSpotParams.y), 0.0, 1.0);
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float fSpotT = pow(fSpotE, vSpotParams.z);
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vOutDiffuse += vDiffuseColour * nDotL * fAtten * fSpotT;
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vOutSpecular += vSpecularColour * pow(clamp(nDotH, 0.0, 1.0), fSpecularPower) * fAtten * fSpotT;
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}
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}
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