/indra/newview/app_settings/shaders/class1/deferred/softenLightF.glsl

  1/** 
  2 * @file softenLightF.glsl
  3 *
  4 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
  5 * Second Life Viewer Source Code
  6 * Copyright (C) 2007, Linden Research, Inc.
  7 * 
  8 * This library is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU Lesser General Public
 10 * License as published by the Free Software Foundation;
 11 * version 2.1 of the License only.
 12 * 
 13 * This library is distributed in the hope that it will be useful,
 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16 * Lesser General Public License for more details.
 17 * 
 18 * You should have received a copy of the GNU Lesser General Public
 19 * License along with this library; if not, write to the Free Software
 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 21 * 
 22 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 23 * $/LicenseInfo$
 24 */
 25 
 26#extension GL_ARB_texture_rectangle : enable
 27
 28#ifdef DEFINE_GL_FRAGCOLOR
 29out vec4 gl_FragColor;
 30#endif
 31
 32uniform sampler2DRect diffuseRect;
 33uniform sampler2DRect specularRect;
 34uniform sampler2DRect positionMap;
 35uniform sampler2DRect normalMap;
 36uniform sampler2DRect lightMap;
 37uniform sampler2DRect depthMap;
 38uniform samplerCube environmentMap;
 39uniform sampler2D	  lightFunc;
 40
 41uniform float blur_size;
 42uniform float blur_fidelity;
 43
 44// Inputs
 45uniform vec4 morphFactor;
 46uniform vec3 camPosLocal;
 47//uniform vec4 camPosWorld;
 48uniform vec4 gamma;
 49uniform vec4 lightnorm;
 50uniform vec4 sunlight_color;
 51uniform vec4 ambient;
 52uniform vec4 blue_horizon;
 53uniform vec4 blue_density;
 54uniform vec4 haze_horizon;
 55uniform vec4 haze_density;
 56uniform vec4 cloud_shadow;
 57uniform vec4 density_multiplier;
 58uniform vec4 distance_multiplier;
 59uniform vec4 max_y;
 60uniform vec4 glow;
 61uniform float scene_light_strength;
 62uniform mat3 env_mat;
 63uniform mat3 ssao_effect_mat;
 64
 65uniform vec3 sun_dir;
 66VARYING vec2 vary_fragcoord;
 67
 68vec3 vary_PositionEye;
 69
 70vec3 vary_SunlitColor;
 71vec3 vary_AmblitColor;
 72vec3 vary_AdditiveColor;
 73vec3 vary_AtmosAttenuation;
 74
 75uniform mat4 inv_proj;
 76uniform vec2 screen_res;
 77
 78vec4 getPosition_d(vec2 pos_screen, float depth)
 79{
 80	vec2 sc = pos_screen.xy*2.0;
 81	sc /= screen_res;
 82	sc -= vec2(1.0,1.0);
 83	vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
 84	vec4 pos = inv_proj * ndc;
 85	pos /= pos.w;
 86	pos.w = 1.0;
 87	return pos;
 88}
 89
 90vec4 getPosition(vec2 pos_screen)
 91{ //get position in screen space (world units) given window coordinate and depth map
 92	float depth = texture2DRect(depthMap, pos_screen.xy).a;
 93	return getPosition_d(pos_screen, depth);
 94}
 95
 96vec3 getPositionEye()
 97{
 98	return vary_PositionEye;
 99}
100vec3 getSunlitColor()
101{
102	return vary_SunlitColor;
103}
104vec3 getAmblitColor()
105{
106	return vary_AmblitColor;
107}
108vec3 getAdditiveColor()
109{
110	return vary_AdditiveColor;
111}
112vec3 getAtmosAttenuation()
113{
114	return vary_AtmosAttenuation;
115}
116
117
118void setPositionEye(vec3 v)
119{
120	vary_PositionEye = v;
121}
122
123void setSunlitColor(vec3 v)
124{
125	vary_SunlitColor = v;
126}
127
128void setAmblitColor(vec3 v)
129{
130	vary_AmblitColor = v;
131}
132
133void setAdditiveColor(vec3 v)
134{
135	vary_AdditiveColor = v;
136}
137
138void setAtmosAttenuation(vec3 v)
139{
140	vary_AtmosAttenuation = v;
141}
142
143void calcAtmospherics(vec3 inPositionEye, float ambFactor) {
144
145	vec3 P = inPositionEye;
146	setPositionEye(P);
147	
148	vec3 tmpLightnorm = lightnorm.xyz;
149
150	vec3 Pn = normalize(P);
151	float Plen = length(P);
152
153	vec4 temp1 = vec4(0);
154	vec3 temp2 = vec3(0);
155	vec4 blue_weight;
156	vec4 haze_weight;
157	vec4 sunlight = sunlight_color;
158	vec4 light_atten;
159
160	//sunlight attenuation effect (hue and brightness) due to atmosphere
161	//this is used later for sunlight modulation at various altitudes
162	light_atten = (blue_density * 1.0 + vec4(haze_density.r) * 0.25) * (density_multiplier.x * max_y.x);
163		//I had thought blue_density and haze_density should have equal weighting,
164		//but attenuation due to haze_density tends to seem too strong
165
166	temp1 = blue_density + vec4(haze_density.r);
167	blue_weight = blue_density / temp1;
168	haze_weight = vec4(haze_density.r) / temp1;
169
170	//(TERRAIN) compute sunlight from lightnorm only (for short rays like terrain)
171	temp2.y = max(0.0, tmpLightnorm.y);
172	temp2.y = 1. / temp2.y;
173	sunlight *= exp( - light_atten * temp2.y);
174
175	// main atmospheric scattering line integral
176	temp2.z = Plen * density_multiplier.x;
177
178	// Transparency (-> temp1)
179	// ATI Bugfix -- can't store temp1*temp2.z*distance_multiplier.x in a variable because the ati
180	// compiler gets confused.
181	temp1 = exp(-temp1 * temp2.z * distance_multiplier.x);
182
183	//final atmosphere attenuation factor
184	setAtmosAttenuation(temp1.rgb);
185	
186	//compute haze glow
187	//(can use temp2.x as temp because we haven't used it yet)
188	temp2.x = dot(Pn, tmpLightnorm.xyz);
189	temp2.x = 1. - temp2.x;
190		//temp2.x is 0 at the sun and increases away from sun
191	temp2.x = max(temp2.x, .03);	//was glow.y
192		//set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot)
193	temp2.x *= glow.x;
194		//higher glow.x gives dimmer glow (because next step is 1 / "angle")
195	temp2.x = pow(temp2.x, glow.z);
196		//glow.z should be negative, so we're doing a sort of (1 / "angle") function
197
198	//add "minimum anti-solar illumination"
199	temp2.x += .25;
200	
201	//increase ambient when there are more clouds
202	vec4 tmpAmbient = ambient + (vec4(1.) - ambient) * cloud_shadow.x * 0.5;
203	
204	/*  decrease value and saturation (that in HSV, not HSL) for occluded areas
205	 * // for HSV color/geometry used here, see http://gimp-savvy.com/BOOK/index.html?node52.html
206	 * // The following line of code performs the equivalent of:
207	 * float ambAlpha = tmpAmbient.a;
208	 * float ambValue = dot(vec3(tmpAmbient), vec3(0.577)); // projection onto <1/rt(3), 1/rt(3), 1/rt(3)>, the neutral white-black axis
209	 * vec3 ambHueSat = vec3(tmpAmbient) - vec3(ambValue);
210	 * tmpAmbient = vec4(RenderSSAOEffect.valueFactor * vec3(ambValue) + RenderSSAOEffect.saturationFactor *(1.0 - ambFactor) * ambHueSat, ambAlpha);
211	 */
212	tmpAmbient = vec4(mix(ssao_effect_mat * tmpAmbient.rgb, tmpAmbient.rgb, ambFactor), tmpAmbient.a);
213
214	//haze color
215	setAdditiveColor(
216		vec3(blue_horizon * blue_weight * (sunlight*(1.-cloud_shadow.x) + tmpAmbient)
217	  + (haze_horizon.r * haze_weight) * (sunlight*(1.-cloud_shadow.x) * temp2.x
218		  + tmpAmbient)));
219
220	//brightness of surface both sunlight and ambient
221	setSunlitColor(vec3(sunlight * .5));
222	setAmblitColor(vec3(tmpAmbient * .25));
223	setAdditiveColor(getAdditiveColor() * vec3(1.0 - temp1));
224}
225
226vec3 atmosLighting(vec3 light)
227{
228	light *= getAtmosAttenuation().r;
229	light += getAdditiveColor();
230	return (2.0 * light);
231}
232
233vec3 atmosTransport(vec3 light) {
234	light *= getAtmosAttenuation().r;
235	light += getAdditiveColor() * 2.0;
236	return light;
237}
238vec3 atmosGetDiffuseSunlightColor()
239{
240	return getSunlitColor();
241}
242
243vec3 scaleDownLight(vec3 light)
244{
245	return (light / scene_light_strength );
246}
247
248vec3 scaleUpLight(vec3 light)
249{
250	return (light * scene_light_strength);
251}
252
253vec3 atmosAmbient(vec3 light)
254{
255	return getAmblitColor() + light / 2.0;
256}
257
258vec3 atmosAffectDirectionalLight(float lightIntensity)
259{
260	return getSunlitColor() * lightIntensity;
261}
262
263vec3 scaleSoftClip(vec3 light)
264{
265	//soft clip effect:
266	light = 1. - clamp(light, vec3(0.), vec3(1.));
267	light = 1. - pow(light, gamma.xxx);
268
269	return light;
270}
271
272void main() 
273{
274	vec2 tc = vary_fragcoord.xy;
275	float depth = texture2DRect(depthMap, tc.xy).r;
276	vec3 pos = getPosition_d(tc, depth).xyz;
277	vec3 norm = texture2DRect(normalMap, tc).xyz;
278	norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
279		
280	float da = max(dot(norm.xyz, sun_dir.xyz), 0.0);
281	
282	vec4 diffuse = texture2DRect(diffuseRect, tc);
283	vec4 spec = texture2DRect(specularRect, vary_fragcoord.xy);
284	
285	vec3 col;
286	float bloom = 0.0;
287	if (diffuse.a < 0.9)
288	{
289		calcAtmospherics(pos.xyz, 1.0);
290	
291		col = atmosAmbient(vec3(0));
292		col += atmosAffectDirectionalLight(max(min(da, 1.0), diffuse.a));
293	
294		col *= diffuse.rgb;
295	
296		if (spec.a > 0.0) // specular reflection
297		{
298			// the old infinite-sky shiny reflection
299			//
300			vec3 refnormpersp = normalize(reflect(pos.xyz, norm.xyz));
301			float sa = dot(refnormpersp, sun_dir.xyz);
302			vec3 dumbshiny = vary_SunlitColor*texture2D(lightFunc, vec2(sa, spec.a)).r;
303			
304			// add the two types of shiny together
305			vec3 spec_contrib = dumbshiny * spec.rgb;
306			bloom = dot(spec_contrib, spec_contrib);
307			col += spec_contrib;
308
309			//add environmentmap
310			vec3 env_vec = env_mat * refnormpersp;
311			col = mix(col.rgb, textureCube(environmentMap, env_vec).rgb, 
312				max(spec.a-diffuse.a*2.0, 0.0)); 
313		}
314	
315		col = atmosLighting(col);
316		col = scaleSoftClip(col);
317
318		col = mix(col.rgb, diffuse.rgb, diffuse.a);
319	}
320	else
321	{
322		col = diffuse.rgb;
323	}
324
325	gl_FragColor.rgb = col;
326
327	gl_FragColor.a = bloom;
328}