503 lines
12 KiB
GLSL
503 lines
12 KiB
GLSL
/**
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* @file softenLightF.glsl
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*
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2007, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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//#extension GL_ARB_texture_rectangle : enable
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#ifdef DEFINE_GL_FRAGCOLOR
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out vec4 frag_color;
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#else
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#define frag_color gl_FragColor
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#endif
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uniform sampler2DRect diffuseRect;
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uniform sampler2DRect specularRect;
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uniform sampler2DRect normalMap;
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uniform sampler2DRect lightMap;
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uniform sampler2DRect depthMap;
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uniform samplerCube environmentMap;
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uniform sampler2D lightFunc;
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uniform float blur_size;
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uniform float blur_fidelity;
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// Inputs
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uniform vec4 morphFactor;
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uniform vec3 camPosLocal;
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//uniform vec4 camPosWorld;
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uniform vec4 gamma;
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uniform vec4 lightnorm;
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uniform vec4 sunlight_color;
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uniform vec4 ambient;
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uniform vec4 blue_horizon;
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uniform vec4 blue_density;
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uniform float haze_horizon;
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uniform float haze_density;
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uniform float cloud_shadow;
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uniform float density_multiplier;
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uniform float distance_multiplier;
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uniform float max_y;
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uniform vec4 glow;
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uniform float global_gamma;
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uniform float scene_light_strength;
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uniform mat3 env_mat;
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uniform vec4 shadow_clip;
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uniform float ssao_effect;
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uniform vec3 sun_dir;
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VARYING vec2 vary_fragcoord;
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vec3 vary_PositionEye;
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vec3 vary_SunlitColor;
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vec3 vary_AmblitColor;
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vec3 vary_AdditiveColor;
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vec3 vary_AtmosAttenuation;
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uniform mat4 inv_proj;
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uniform vec2 screen_res;
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vec3 srgb_to_linear(vec3 cs)
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{
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vec3 low_range = cs / vec3(12.92);
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vec3 high_range = pow((cs+vec3(0.055))/vec3(1.055), vec3(2.4));
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bvec3 lte = lessThanEqual(cs,vec3(0.04045));
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#ifdef OLD_SELECT
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vec3 result;
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result.r = lte.r ? low_range.r : high_range.r;
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result.g = lte.g ? low_range.g : high_range.g;
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result.b = lte.b ? low_range.b : high_range.b;
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return result;
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#else
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return mix(high_range, low_range, lte);
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#endif
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}
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vec3 linear_to_srgb(vec3 cl)
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{
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cl = clamp(cl, vec3(0), vec3(1));
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vec3 low_range = cl * 12.92;
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vec3 high_range = 1.055 * pow(cl, vec3(0.41666)) - 0.055;
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bvec3 lt = lessThan(cl,vec3(0.0031308));
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#ifdef OLD_SELECT
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vec3 result;
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result.r = lt.r ? low_range.r : high_range.r;
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result.g = lt.g ? low_range.g : high_range.g;
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result.b = lt.b ? low_range.b : high_range.b;
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return result;
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#else
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return mix(high_range, low_range, lt);
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#endif
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}
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vec2 encode_normal(vec3 n)
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{
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float f = sqrt(8 * n.z + 8);
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return n.xy / f + 0.5;
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}
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vec3 decode_normal (vec2 enc)
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{
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vec2 fenc = enc*4-2;
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float f = dot(fenc,fenc);
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float g = sqrt(1-f/4);
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vec3 n;
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n.xy = fenc*g;
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n.z = 1-f/2;
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return n;
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}
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vec4 getPosition_d(vec2 pos_screen, float depth)
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{
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vec2 sc = pos_screen.xy*2.0;
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sc /= screen_res;
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sc -= vec2(1.0,1.0);
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vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
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vec4 pos = inv_proj * ndc;
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pos /= pos.w;
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pos.w = 1.0;
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return pos;
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}
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vec4 getPosition(vec2 pos_screen)
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{ //get position in screen space (world units) given window coordinate and depth map
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float depth = texture2DRect(depthMap, pos_screen.xy).r;
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return getPosition_d(pos_screen, depth);
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}
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vec3 getPositionEye()
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{
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return vary_PositionEye;
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}
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vec3 getSunlitColor()
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{
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return vary_SunlitColor;
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}
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vec3 getAmblitColor()
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{
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return vary_AmblitColor;
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}
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vec3 getAdditiveColor()
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{
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return vary_AdditiveColor;
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}
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vec3 getAtmosAttenuation()
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{
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return vary_AtmosAttenuation;
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}
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void setPositionEye(vec3 v)
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{
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vary_PositionEye = v;
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}
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void setSunlitColor(vec3 v)
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{
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vary_SunlitColor = v;
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}
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void setAmblitColor(vec3 v)
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{
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vary_AmblitColor = v;
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}
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void setAdditiveColor(vec3 v)
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{
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vary_AdditiveColor = v;
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}
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void setAtmosAttenuation(vec3 v)
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{
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vary_AtmosAttenuation = v;
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}
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void calcAtmospherics(vec3 inPositionEye, float ambFactor) {
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vec3 P = inPositionEye;
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setPositionEye(P);
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vec3 tmpLightnorm = lightnorm.xyz;
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vec3 Pn = normalize(P);
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float Plen = length(P);
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vec4 temp1 = vec4(0);
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vec3 temp2 = vec3(0);
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vec4 blue_weight;
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vec4 haze_weight;
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vec4 sunlight = sunlight_color;
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vec4 light_atten;
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//sunlight attenuation effect (hue and brightness) due to atmosphere
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//this is used later for sunlight modulation at various altitudes
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light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y);
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//I had thought blue_density and haze_density should have equal weighting,
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//but attenuation due to haze_density tends to seem too strong
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temp1 = blue_density + vec4(haze_density);
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blue_weight = blue_density / temp1;
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haze_weight = vec4(haze_density) / temp1;
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//(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain)
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temp2.y = max(0.0, tmpLightnorm.y);
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temp2.y = 1. / temp2.y;
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sunlight *= exp( - light_atten * temp2.y);
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// main atmospheric scattering line integral
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temp2.z = Plen * density_multiplier;
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// Transparency (-> temp1)
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// ATI Bugfix -- can't store temp1*temp2.z*distance_multiplier in a variable because the ati
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// compiler gets confused.
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temp1 = exp(-temp1 * temp2.z * distance_multiplier);
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//final atmosphere attenuation factor
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setAtmosAttenuation(temp1.rgb);
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//compute haze glow
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//(can use temp2.x as temp because we haven't used it yet)
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temp2.x = dot(Pn, tmpLightnorm.xyz);
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temp2.x = 1. - temp2.x;
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//temp2.x is 0 at the sun and increases away from sun
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temp2.x = max(temp2.x, .03); //was glow.y
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//set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
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temp2.x *= glow.x;
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//higher glow.x gives dimmer glow (because next step is 1 / "angle")
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temp2.x = pow(temp2.x, glow.z);
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//glow.z should be negative, so we're doing a sort of (1 / "angle") function
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//add "minimum anti-solar illumination"
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temp2.x += .25;
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//increase ambient when there are more clouds
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vec4 tmpAmbient = ambient + (vec4(1.) - ambient) * cloud_shadow * 0.5;
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//haze color
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setAdditiveColor(
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vec3(blue_horizon * blue_weight * (sunlight*(1.-cloud_shadow) + tmpAmbient)
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+ (haze_horizon * haze_weight) * (sunlight*(1.-cloud_shadow) * temp2.x
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+ tmpAmbient)));
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// decrease ambient value for occluded areas
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tmpAmbient *= mix(ssao_effect, 1.0, ambFactor);
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//brightness of surface both sunlight and ambient
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/*setSunlitColor(pow(vec3(sunlight * .5), vec3(global_gamma)) * global_gamma);
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setAmblitColor(pow(vec3(tmpAmbient * .25), vec3(global_gamma)) * global_gamma);
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setAdditiveColor(pow(getAdditiveColor() * vec3(1.0 - temp1), vec3(global_gamma)) * global_gamma);*/
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setSunlitColor(vec3(sunlight * .5));
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setAmblitColor(vec3(tmpAmbient * .25));
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setAdditiveColor(getAdditiveColor() * vec3(1.0 - temp1));
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}
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#ifdef WATER_FOG
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uniform vec4 waterPlane;
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uniform vec4 waterFogColor;
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uniform float waterFogDensity;
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uniform float waterFogKS;
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vec4 applyWaterFogDeferred(vec3 pos, vec4 color)
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{
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//normalize view vector
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vec3 view = normalize(pos);
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float es = -(dot(view, waterPlane.xyz));
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//find intersection point with water plane and eye vector
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//get eye depth
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float e0 = max(-waterPlane.w, 0.0);
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vec3 int_v = waterPlane.w > 0.0 ? view * waterPlane.w/es : vec3(0.0, 0.0, 0.0);
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//get object depth
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float depth = length(pos - int_v);
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//get "thickness" of water
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float l = max(depth, 0.1);
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float kd = waterFogDensity;
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float ks = waterFogKS;
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vec4 kc = waterFogColor;
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float F = 0.98;
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float t1 = -kd * pow(F, ks * e0);
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float t2 = kd + ks * es;
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float t3 = pow(F, t2*l) - 1.0;
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float L = min(t1/t2*t3, 1.0);
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float D = pow(0.98, l*kd);
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color.rgb = color.rgb * D + kc.rgb * L;
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color.a = kc.a + color.a;
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return color;
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}
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#endif
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vec3 atmosLighting(vec3 light)
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{
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light *= getAtmosAttenuation().r;
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light += getAdditiveColor();
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return (2.0 * light);
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}
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vec3 atmosTransport(vec3 light) {
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light *= getAtmosAttenuation().r;
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light += getAdditiveColor() * 2.0;
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return light;
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}
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vec3 fullbrightAtmosTransport(vec3 light) {
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float brightness = dot(light.rgb, vec3(0.33333));
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return mix(atmosTransport(light.rgb), light.rgb + getAdditiveColor().rgb, brightness * brightness);
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}
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vec3 atmosGetDiffuseSunlightColor()
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{
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return getSunlitColor();
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}
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vec3 scaleDownLight(vec3 light)
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{
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return (light / scene_light_strength );
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}
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vec3 scaleUpLight(vec3 light)
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{
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return (light * scene_light_strength);
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}
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vec3 atmosAmbient(vec3 light)
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{
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return getAmblitColor() + light / 2.0;
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}
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vec3 atmosAffectDirectionalLight(float lightIntensity)
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{
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return getSunlitColor() * lightIntensity;
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}
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vec3 scaleSoftClip(vec3 light)
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{
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//soft clip effect:
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light = 1. - clamp(light, vec3(0.), vec3(1.));
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light = 1. - pow(light, gamma.xxx);
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return light;
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}
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vec3 fullbrightScaleSoftClip(vec3 light)
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{
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//soft clip effect:
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return light;
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}
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float luminance(vec3 color)
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{
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/// CALCULATING LUMINANCE (Using NTSC lum weights)
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/// http://en.wikipedia.org/wiki/Luma_%28video%29
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return dot(color, vec3(0.299, 0.587, 0.114));
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}
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void main()
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{
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vec2 tc = vary_fragcoord.xy;
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float depth = texture2DRect(depthMap, tc.xy).r;
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vec3 pos = getPosition_d(tc, depth).xyz;
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vec4 norm = texture2DRect(normalMap, tc);
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float envIntensity = norm.z;
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norm.xyz = decode_normal(norm.xy); // unpack norm
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vec4 diffuse = texture2DRect(diffuseRect, tc);
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//convert to gamma space
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diffuse.rgb = linear_to_srgb(diffuse.rgb);
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vec3 col;
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float bloom = 0.0;
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{
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vec4 spec = texture2DRect(specularRect, vary_fragcoord.xy);
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bloom = spec.r*norm.w;
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if (norm.w < 0.5)
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{
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float da = max(dot(norm.xyz, sun_dir.xyz), 0.0);
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float light_gamma = 1.0/1.3;
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da = pow(da, light_gamma);
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vec2 scol_ambocc = texture2DRect(lightMap, vary_fragcoord.xy).rg;
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scol_ambocc = pow(scol_ambocc, vec2(light_gamma));
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float scol = max(scol_ambocc.r, diffuse.a);
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float ambocc = scol_ambocc.g;
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calcAtmospherics(pos.xyz, ambocc);
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col = atmosAmbient(vec3(0));
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float ambient = min(abs(dot(norm.xyz, sun_dir.xyz)), 1.0);
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ambient *= 0.5;
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ambient *= ambient;
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ambient = (1.0-ambient);
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col.rgb *= ambient;
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col += atmosAffectDirectionalLight(max(min(da, scol), 0.0));
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col *= diffuse.rgb;
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vec3 refnormpersp = normalize(reflect(pos.xyz, norm.xyz));
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if (spec.a > 0.0) // specular reflection
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{
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// the old infinite-sky shiny reflection
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//
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float sa = dot(refnormpersp, sun_dir.xyz);
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vec3 dumbshiny = vary_SunlitColor*scol_ambocc.r*(texture2D(lightFunc, vec2(sa, spec.a)).r);
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// add the two types of shiny together
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vec3 spec_contrib = dumbshiny * spec.rgb;
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bloom = dot(spec_contrib, spec_contrib) / 6;
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col += spec_contrib;
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}
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col = mix(col, diffuse.rgb, diffuse.a);
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if (envIntensity > 0.0)
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{ //add environmentmap
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vec3 env_vec = env_mat * refnormpersp;
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vec3 refcol = textureCube(environmentMap, env_vec).rgb; //Perhaps mix with a cubemap without sun, in the future.
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bloom = (luminance(refcol) - .45)*.25*scol_ambocc.r;
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col = mix(col.rgb, refcol,
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envIntensity);
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}
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//if (norm.w < 0.5)
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{
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col = mix(atmosLighting(col), fullbrightAtmosTransport(col), diffuse.a);
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col = mix(scaleSoftClip(col), fullbrightScaleSoftClip(col), diffuse.a);
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//bloom += (luminance(col))*.075; //This looks nice, but requires a larger glow rendertarget.
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}
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#ifdef WATER_FOG
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vec4 fogged = applyWaterFogDeferred(pos,vec4(col, bloom));
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col = fogged.rgb;
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bloom = fogged.a;
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#endif
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}
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else
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{
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col = diffuse.rgb;
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}
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col = srgb_to_linear(col);
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//col = vec3(1,0,1);
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//col.g = envIntensity;
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}
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frag_color.rgb = col;
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frag_color.a = bloom;
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}
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