ffb285c6ff
-Nametag bubble visbility is oddly inconsistent. May vanish with future planned UI merges... -VBOs are PAINFULLY slow on ATI hardware. This repos self-compiled davep/shining-fixes branch, so I'll leave the ball in LL's court for now regarding that.
136 lines
4.1 KiB
GLSL
136 lines
4.1 KiB
GLSL
/**
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* @file sunLightSSAOF.glsl
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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 gl_FragColor;
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#endif
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//class 1 -- no shadow, SSAO only
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uniform sampler2DRect depthMap;
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uniform sampler2DRect normalMap;
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uniform sampler2D noiseMap;
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// Inputs
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uniform mat4 shadow_matrix[6];
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uniform vec4 shadow_clip;
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uniform float ssao_radius;
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uniform float ssao_max_radius;
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uniform float ssao_factor;
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uniform float ssao_factor_inv;
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VARYING vec2 vary_fragcoord;
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uniform mat4 inv_proj;
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uniform vec2 screen_res;
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uniform float shadow_bias;
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uniform float shadow_offset;
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vec4 getPosition(vec2 pos_screen)
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{
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float depth = texture2DRect(depthMap, pos_screen.xy).r;
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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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//calculate decreases in ambient lighting when crowded out (SSAO)
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float calcAmbientOcclusion(vec4 pos, vec3 norm)
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{
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float ret = 1.0;
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vec2 kern[8];
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// exponentially (^2) distant occlusion samples spread around origin
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kern[0] = vec2(-1.0, 0.0) * 0.125*0.125;
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kern[1] = vec2(1.0, 0.0) * 0.250*0.250;
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kern[2] = vec2(0.0, 1.0) * 0.375*0.375;
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kern[3] = vec2(0.0, -1.0) * 0.500*0.500;
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kern[4] = vec2(0.7071, 0.7071) * 0.625*0.625;
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kern[5] = vec2(-0.7071, -0.7071) * 0.750*0.750;
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kern[6] = vec2(-0.7071, 0.7071) * 0.875*0.875;
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kern[7] = vec2(0.7071, -0.7071) * 1.000*1.000;
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vec2 pos_screen = vary_fragcoord.xy;
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vec3 pos_world = pos.xyz;
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vec2 noise_reflect = texture2D(noiseMap, vary_fragcoord.xy/128.0).xy;
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float angle_hidden = 0.0;
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int points = 0;
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float scale = min(ssao_radius / -pos_world.z, ssao_max_radius);
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// it was found that keeping # of samples a constant was the fastest, probably due to compiler optimizations unrolling?)
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for (int i = 0; i < 8; i++)
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{
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vec2 samppos_screen = pos_screen + scale * reflect(kern[i], noise_reflect);
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vec3 samppos_world = getPosition(samppos_screen).xyz;
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vec3 diff = pos_world - samppos_world;
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float dist2 = dot(diff, diff);
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// assume each sample corresponds to an occluding sphere with constant radius, constant x-sectional area
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// --> solid angle shrinking by the square of distance
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//radius is somewhat arbitrary, can approx with just some constant k * 1 / dist^2
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//(k should vary inversely with # of samples, but this is taken care of later)
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angle_hidden = angle_hidden + float(dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) * min(1.0/dist2, ssao_factor_inv);
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// 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion"
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points = points + int(diff.z > -1.0);
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}
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angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0);
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ret = (1.0 - (float(points != 0) * angle_hidden));
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return min(ret, 1.0);
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}
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void main()
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{
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vec2 pos_screen = vary_fragcoord.xy;
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//try doing an unproject here
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vec4 pos = getPosition(pos_screen);
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vec3 norm = texture2DRect(normalMap, pos_screen).xyz;
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norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
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gl_FragColor[0] = 1.0;
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gl_FragColor[1] = calcAmbientOcclusion(pos, norm);
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gl_FragColor[2] = 1.0;
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gl_FragColor[3] = 1.0;
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}
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