From 7e9033821a96a9d6e80b58fafb4c7da63807b9d4 Mon Sep 17 00:00:00 2001 From: Graham Linden Date: Thu, 6 Dec 2018 10:59:11 -0800 Subject: De-duplicate deferred gbuffer access for getPosition/getNorm. De-duplicate ambient occlusion shader code and move to new aoUtil.glsl Split shared shadow tap funcs into shadowUtil.glsl --- .../shaders/class1/deferred/aoUtil.glsl | 93 ++++++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl (limited to 'indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl') diff --git a/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl new file mode 100644 index 0000000000..3bb59dd7f9 --- /dev/null +++ b/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl @@ -0,0 +1,93 @@ +/** + * @file class1/deferred/aoUtil.glsl + * + * $LicenseInfo:firstyear=2007&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2007, Linden Research, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; + * version 2.1 of the License only. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA + * $/LicenseInfo$ + */ + +uniform sampler2D noiseMap; + +uniform float ssao_radius; +uniform float ssao_max_radius; +uniform float ssao_factor; +uniform float ssao_factor_inv; + +vec4 getPosition(vec2 pos_screen); + +vec2 getKern(int i) +{ + vec2 kern[8]; + // exponentially (^2) distant occlusion samples spread around origin + kern[0] = vec2(-1.0, 0.0) * 0.125*0.125; + kern[1] = vec2(1.0, 0.0) * 0.250*0.250; + kern[2] = vec2(0.0, 1.0) * 0.375*0.375; + kern[3] = vec2(0.0, -1.0) * 0.500*0.500; + kern[4] = vec2(0.7071, 0.7071) * 0.625*0.625; + kern[5] = vec2(-0.7071, -0.7071) * 0.750*0.750; + kern[6] = vec2(-0.7071, 0.7071) * 0.875*0.875; + kern[7] = vec2(0.7071, -0.7071) * 1.000*1.000; + + return kern[i]; +} + +//calculate decreases in ambient lighting when crowded out (SSAO) +float calcAmbientOcclusion(vec4 pos, vec3 norm, vec2 pos_screen) +{ + float ret = 1.0; + vec3 pos_world = pos.xyz; + vec2 noise_reflect = texture2D(noiseMap, pos_screen.xy/128.0).xy; + + float angle_hidden = 0.0; + float points = 0; + + float scale = min(ssao_radius / -pos_world.z, ssao_max_radius); + + // it was found that keeping # of samples a constant was the fastest, probably due to compiler optimizations (unrolling?) + for (int i = 0; i < 8; i++) + { + vec2 samppos_screen = pos_screen + scale * reflect(getKern(i), noise_reflect); + vec3 samppos_world = getPosition(samppos_screen).xyz; + + vec3 diff = pos_world - samppos_world; + float dist2 = dot(diff, diff); + + // assume each sample corresponds to an occluding sphere with constant radius, constant x-sectional area + // --> solid angle shrinking by the square of distance + //radius is somewhat arbitrary, can approx with just some constant k * 1 / dist^2 + //(k should vary inversely with # of samples, but this is taken care of later) + + float funky_val = (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) ? 1.0 : 0.0; + angle_hidden = angle_hidden + funky_val * min(1.0/dist2, ssao_factor_inv); + + // 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion" + float diffz_val = (diff.z > -1.0) ? 1.0 : 0.0; + points = points + diffz_val; + } + + angle_hidden = min(ssao_factor*angle_hidden/points, 1.0); + + float points_val = (points > 0.0) ? 1.0 : 0.0; + ret = (1.0 - (points_val * angle_hidden)); + + ret = max(ret, 0.0); + return min(ret, 1.0); +} + -- cgit v1.2.3 From deb6110098569fb90ca7e5073c2e98fabbb23a82 Mon Sep 17 00:00:00 2001 From: Graham Linden Date: Wed, 30 Jan 2019 13:26:35 -0800 Subject: Eliminate helper GLSL modules depending on further GLSL modules to give Intel HD x000 compiler a fighting chance. More WIP for edge-specific water shader for 9996. --- .../shaders/class1/deferred/aoUtil.glsl | 34 ++++++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) (limited to 'indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl') diff --git a/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl b/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl index 3bb59dd7f9..23adbded5e 100644 --- a/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl +++ b/indra/newview/app_settings/shaders/class1/deferred/aoUtil.glsl @@ -24,13 +24,43 @@ */ uniform sampler2D noiseMap; +uniform sampler2DRect normalMap; +uniform sampler2DRect depthMap; uniform float ssao_radius; uniform float ssao_max_radius; uniform float ssao_factor; uniform float ssao_factor_inv; -vec4 getPosition(vec2 pos_screen); +uniform mat4 inv_proj; +uniform vec2 screen_res; + +vec2 getScreenCoordinateAo(vec2 screenpos) +{ + vec2 sc = screenpos.xy * 2.0; + if (screen_res.x > 0 && screen_res.y > 0) + { + sc /= screen_res; + } + return sc - vec2(1.0, 1.0); +} + +float getDepthAo(vec2 pos_screen) +{ + float depth = texture2DRect(depthMap, pos_screen).r; + return depth; +} + +vec4 getPositionAo(vec2 pos_screen) +{ + float depth = getDepthAo(pos_screen); + vec2 sc = getScreenCoordinateAo(pos_screen); + vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0); + vec4 pos = inv_proj * ndc; + pos /= pos.w; + pos.w = 1.0; + return pos; +} vec2 getKern(int i) { @@ -64,7 +94,7 @@ float calcAmbientOcclusion(vec4 pos, vec3 norm, vec2 pos_screen) for (int i = 0; i < 8; i++) { vec2 samppos_screen = pos_screen + scale * reflect(getKern(i), noise_reflect); - vec3 samppos_world = getPosition(samppos_screen).xyz; + vec3 samppos_world = getPositionAo(samppos_screen).xyz; vec3 diff = pos_world - samppos_world; float dist2 = dot(diff, diff); -- cgit v1.2.3