From e6b5481cad3f81f18ff04ff6af86bd7ad5b9c5da Mon Sep 17 00:00:00 2001 From: Dave Parks Date: Wed, 14 Dec 2022 11:00:31 -0600 Subject: SL-18782 WIP -- stub for reflection probe display. --- .../shaders/class2/interface/reflectionprobeF.glsl | 42 ++++++++++++++++++++++ .../shaders/class2/interface/reflectionprobeV.glsl | 38 ++++++++++++++++++++ 2 files changed, 80 insertions(+) create mode 100644 indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl create mode 100644 indra/newview/app_settings/shaders/class2/interface/reflectionprobeV.glsl (limited to 'indra/newview/app_settings/shaders/class2/interface') diff --git a/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl b/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl new file mode 100644 index 0000000000..986b233e0b --- /dev/null +++ b/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl @@ -0,0 +1,42 @@ +/** + * @file reflectionprobeF.glsl + * + * $LicenseInfo:firstyear=2022&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2022, 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 + * $/LicenseInfo$ + */ + +out vec4 frag_color; + +in vec2 vary_fragcoord; + +vec4 getPositionWithDepth(vec2 pos_screen, float depth); +float getDepth(vec2 pos_screen); + +vec4 sampleReflectionProbesDebug(vec3 pos); + +void main() +{ + vec2 tc = vary_fragcoord.xy; + float depth = getDepth(tc.xy); + vec4 pos = getPositionWithDepth(tc, depth); + + frag_color = sampleReflectionProbesDebug(pos.xyz); +} diff --git a/indra/newview/app_settings/shaders/class2/interface/reflectionprobeV.glsl b/indra/newview/app_settings/shaders/class2/interface/reflectionprobeV.glsl new file mode 100644 index 0000000000..e45b1c288b --- /dev/null +++ b/indra/newview/app_settings/shaders/class2/interface/reflectionprobeV.glsl @@ -0,0 +1,38 @@ +/** + * @file reflectionprobeV.glsl + * + * $LicenseInfo:firstyear=2022&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2011, 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 + * $/LicenseInfo$ + */ + + +in vec3 position; + +out vec2 vary_fragcoord; + +void main() +{ + //transform vertex + vec4 pos = vec4(position.xyz, 1.0); + gl_Position = pos; + + vary_fragcoord = (pos.xy*0.5+0.5); +} -- cgit v1.2.3 From 10b8dcc497599042655dcc4037c9ae98d494bd6f Mon Sep 17 00:00:00 2001 From: Dave Parks Date: Mon, 30 Jan 2023 18:56:19 -0600 Subject: SL-19015 Bump probe resolution back to 256 by default (drop to 128 if vram < 2GB), remove irradiance map feedback loop (one bounce, but but more stable and allows for much brighter first bounce), make sky contribution to irradiance not tint the world blue. Make irradiance that appears in radiance maps match world irradiance. --- .../shaders/class2/interface/irradianceGenF.glsl | 231 +++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl (limited to 'indra/newview/app_settings/shaders/class2/interface') diff --git a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl new file mode 100644 index 0000000000..a4aec48c59 --- /dev/null +++ b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl @@ -0,0 +1,231 @@ +/** + * @file irradianceGenF.glsl + * + * $LicenseInfo:firstyear=2022&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2022, 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 + * $/LicenseInfo$ + */ + + +/*[EXTRA_CODE_HERE]*/ + + +#ifdef DEFINE_GL_FRAGCOLOR +out vec4 frag_color; +#else +#define frag_color gl_FragColor +#endif + +uniform samplerCubeArray reflectionProbes; +uniform int sourceIdx; + +uniform float max_probe_lod; + +VARYING vec3 vary_dir; + + +// Code below is derived from the Khronos GLTF Sample viewer: +// https://github.com/KhronosGroup/glTF-Sample-Viewer/blob/master/source/shaders/ibl_filtering.frag + + +#define MATH_PI 3.1415926535897932384626433832795 + +float u_roughness = 1.0; +int u_sampleCount = 64; +float u_lodBias = 2.0; +int u_width = 64; + +// Hammersley Points on the Hemisphere +// CC BY 3.0 (Holger Dammertz) +// http://holger.dammertz.org/stuff/notes_HammersleyOnHemisphere.html +// with adapted interface +float radicalInverse_VdC(uint bits) +{ + bits = (bits << 16u) | (bits >> 16u); + bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u); + bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u); + bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u); + bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u); + return float(bits) * 2.3283064365386963e-10; // / 0x100000000 +} + +// hammersley2d describes a sequence of points in the 2d unit square [0,1)^2 +// that can be used for quasi Monte Carlo integration +vec2 hammersley2d(int i, int N) { + return vec2(float(i)/float(N), radicalInverse_VdC(uint(i))); +} + +// Hemisphere Sample + +// TBN generates a tangent bitangent normal coordinate frame from the normal +// (the normal must be normalized) +mat3 generateTBN(vec3 normal) +{ + vec3 bitangent = vec3(0.0, 1.0, 0.0); + + float NdotUp = dot(normal, vec3(0.0, 1.0, 0.0)); + float epsilon = 0.0000001; + /*if (1.0 - abs(NdotUp) <= epsilon) + { + // Sampling +Y or -Y, so we need a more robust bitangent. + if (NdotUp > 0.0) + { + bitangent = vec3(0.0, 0.0, 1.0); + } + else + { + bitangent = vec3(0.0, 0.0, -1.0); + } + }*/ + + vec3 tangent = normalize(cross(bitangent, normal)); + bitangent = cross(normal, tangent); + + return mat3(tangent, bitangent, normal); +} + +struct MicrofacetDistributionSample +{ + float pdf; + float cosTheta; + float sinTheta; + float phi; +}; + +MicrofacetDistributionSample Lambertian(vec2 xi, float roughness) +{ + MicrofacetDistributionSample lambertian; + + // Cosine weighted hemisphere sampling + // http://www.pbr-book.org/3ed-2018/Monte_Carlo_Integration/2D_Sampling_with_Multidimensional_Transformations.html#Cosine-WeightedHemisphereSampling + lambertian.cosTheta = sqrt(1.0 - xi.y); + lambertian.sinTheta = sqrt(xi.y); // equivalent to `sqrt(1.0 - cosTheta*cosTheta)`; + lambertian.phi = 2.0 * MATH_PI * xi.x; + + lambertian.pdf = lambertian.cosTheta / MATH_PI; // evaluation for solid angle, therefore drop the sinTheta + + return lambertian; +} + + +// getImportanceSample returns an importance sample direction with pdf in the .w component +vec4 getImportanceSample(int sampleIndex, vec3 N, float roughness) +{ + // generate a quasi monte carlo point in the unit square [0.1)^2 + vec2 xi = hammersley2d(sampleIndex, u_sampleCount); + + MicrofacetDistributionSample importanceSample; + + // generate the points on the hemisphere with a fitting mapping for + // the distribution (e.g. lambertian uses a cosine importance) + importanceSample = Lambertian(xi, roughness); + + // transform the hemisphere sample to the normal coordinate frame + // i.e. rotate the hemisphere to the normal direction + vec3 localSpaceDirection = normalize(vec3( + importanceSample.sinTheta * cos(importanceSample.phi), + importanceSample.sinTheta * sin(importanceSample.phi), + importanceSample.cosTheta + )); + mat3 TBN = generateTBN(N); + vec3 direction = TBN * localSpaceDirection; + + return vec4(direction, importanceSample.pdf); +} + +// Mipmap Filtered Samples (GPU Gems 3, 20.4) +// https://developer.nvidia.com/gpugems/gpugems3/part-iii-rendering/chapter-20-gpu-based-importance-sampling +// https://cgg.mff.cuni.cz/~jaroslav/papers/2007-sketch-fis/Final_sap_0073.pdf +float computeLod(float pdf) +{ + // // Solid angle of current sample -- bigger for less likely samples + // float omegaS = 1.0 / (float(u_sampleCount) * pdf); + // // Solid angle of texel + // // note: the factor of 4.0 * MATH_PI + // float omegaP = 4.0 * MATH_PI / (6.0 * float(u_width) * float(u_width)); + // // Mip level is determined by the ratio of our sample's solid angle to a texel's solid angle + // // note that 0.5 * log2 is equivalent to log4 + // float lod = 0.5 * log2(omegaS / omegaP); + + // babylon introduces a factor of K (=4) to the solid angle ratio + // this helps to avoid undersampling the environment map + // this does not appear in the original formulation by Jaroslav Krivanek and Mark Colbert + // log4(4) == 1 + // lod += 1.0; + + // We achieved good results by using the original formulation from Krivanek & Colbert adapted to cubemaps + + // https://cgg.mff.cuni.cz/~jaroslav/papers/2007-sketch-fis/Final_sap_0073.pdf + float lod = 0.5 * log2( 6.0 * float(u_width) * float(u_width) / (float(u_sampleCount) * pdf)); + + + return lod; +} + +vec4 filterColor(vec3 N) +{ + //return textureLod(uCubeMap, N, 3.0).rgb; + vec4 color = vec4(0.f); + float weight = 0.0f; + + for(int i = 0; i < u_sampleCount; ++i) + { + vec4 importanceSample = getImportanceSample(i, N, 1.0); + + vec3 H = vec3(importanceSample.xyz); + float pdf = importanceSample.w; + + // mipmap filtered samples (GPU Gems 3, 20.4) + float lod = computeLod(pdf); + + // apply the bias to the lod + lod += u_lodBias; + + lod = clamp(lod, 0, max_probe_lod); + // sample lambertian at a lower resolution to avoid fireflies + vec4 lambertian = textureLod(reflectionProbes, vec4(H, sourceIdx), lod); + + color += lambertian; + } + + if(weight != 0.0f) + { + color /= weight; + } + else + { + color /= float(u_sampleCount); + } + + color = min(color*1.9, vec4(1)); + color = pow(color, vec4(0.5)); + return color; +} + +// entry point +void main() +{ + vec4 color = vec4(0); + + color = filterColor(vary_dir); + + frag_color = color; +} + -- cgit v1.2.3 From c9d56e212aa0117661f9c76545ca84b39412bae7 Mon Sep 17 00:00:00 2001 From: Dave Parks Date: Tue, 31 Jan 2023 15:01:05 -0600 Subject: SL-19015 Balance sun/sky ambiance with punctual light ambiance. Prevent irradiance maps from being brighter than the environment. --- .../shaders/class2/interface/irradianceGenF.glsl | 29 ++++++---------------- 1 file changed, 8 insertions(+), 21 deletions(-) (limited to 'indra/newview/app_settings/shaders/class2/interface') diff --git a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl index a4aec48c59..c7da23fb00 100644 --- a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl +++ b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl @@ -26,20 +26,15 @@ /*[EXTRA_CODE_HERE]*/ - -#ifdef DEFINE_GL_FRAGCOLOR out vec4 frag_color; -#else -#define frag_color gl_FragColor -#endif uniform samplerCubeArray reflectionProbes; uniform int sourceIdx; uniform float max_probe_lod; +uniform float ambiance_scale; -VARYING vec3 vary_dir; - +in vec3 vary_dir; // Code below is derived from the Khronos GLTF Sample viewer: // https://github.com/KhronosGroup/glTF-Sample-Viewer/blob/master/source/shaders/ibl_filtering.frag @@ -48,7 +43,7 @@ VARYING vec3 vary_dir; #define MATH_PI 3.1415926535897932384626433832795 float u_roughness = 1.0; -int u_sampleCount = 64; +int u_sampleCount = 32; float u_lodBias = 2.0; int u_width = 64; @@ -183,8 +178,7 @@ vec4 filterColor(vec3 N) { //return textureLod(uCubeMap, N, 3.0).rgb; vec4 color = vec4(0.f); - float weight = 0.0f; - + for(int i = 0; i < u_sampleCount; ++i) { vec4 importanceSample = getImportanceSample(i, N, 1.0); @@ -198,24 +192,17 @@ vec4 filterColor(vec3 N) // apply the bias to the lod lod += u_lodBias; - lod = clamp(lod, 0, max_probe_lod); + lod = clamp(lod, 0, 7); // sample lambertian at a lower resolution to avoid fireflies vec4 lambertian = textureLod(reflectionProbes, vec4(H, sourceIdx), lod); color += lambertian; } - if(weight != 0.0f) - { - color /= weight; - } - else - { - color /= float(u_sampleCount); - } + color /= float(u_sampleCount); + + color.rgb *= ambiance_scale; - color = min(color*1.9, vec4(1)); - color = pow(color, vec4(0.5)); return color; } -- cgit v1.2.3 From e5e94b5fa832c62dc0df239fdb4aefc23e559c0c Mon Sep 17 00:00:00 2001 From: Dave Parks Date: Thu, 23 Feb 2023 11:47:24 -0600 Subject: DRTVWR-559 Fix for irradiance maps going black at 128x128 radiance map resolution. Improve radiance map anti-aliasing and default to 128x128 everywhere. --- .../newview/app_settings/shaders/class2/interface/irradianceGenF.glsl | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'indra/newview/app_settings/shaders/class2/interface') diff --git a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl index c7da23fb00..baf68e11f4 100644 --- a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl +++ b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl @@ -176,7 +176,6 @@ float computeLod(float pdf) vec4 filterColor(vec3 N) { - //return textureLod(uCubeMap, N, 3.0).rgb; vec4 color = vec4(0.f); for(int i = 0; i < u_sampleCount; ++i) @@ -192,7 +191,7 @@ vec4 filterColor(vec3 N) // apply the bias to the lod lod += u_lodBias; - lod = clamp(lod, 0, 7); + lod = clamp(lod, 0, max_probe_lod); // sample lambertian at a lower resolution to avoid fireflies vec4 lambertian = textureLod(reflectionProbes, vec4(H, sourceIdx), lod); -- cgit v1.2.3 From 698966f8e7ddcc0b123a83d7c4e381778f8cd8ab Mon Sep 17 00:00:00 2001 From: RunitaiLinden Date: Tue, 4 Apr 2023 12:29:12 -0500 Subject: =?UTF-8?q?SL-19538=20Remove=20hacky=20ambiance=20scale=20and=20ta?= =?UTF-8?q?ke=20the=20mittens=20off=20probe=20a=E2=80=A6=20(#151)?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * SL-19538 Remove hacky ambiance scale and take the mittens off probe ambiance values. Fix for sky brightening being done in sRGB space. --- .../newview/app_settings/shaders/class2/interface/irradianceGenF.glsl | 3 --- 1 file changed, 3 deletions(-) (limited to 'indra/newview/app_settings/shaders/class2/interface') diff --git a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl index baf68e11f4..d21af946e0 100644 --- a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl +++ b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl @@ -32,7 +32,6 @@ uniform samplerCubeArray reflectionProbes; uniform int sourceIdx; uniform float max_probe_lod; -uniform float ambiance_scale; in vec3 vary_dir; @@ -200,8 +199,6 @@ vec4 filterColor(vec3 N) color /= float(u_sampleCount); - color.rgb *= ambiance_scale; - return color; } -- cgit v1.2.3 From bb79718c8f0050569c80a1bfe4dd428321706d1a Mon Sep 17 00:00:00 2001 From: Dave Parks Date: Thu, 6 Apr 2023 13:21:25 -0500 Subject: SL-19538 Followup -- scrub all possible sources of NaNs, make dynamic exposure controls not persist, limit exposure range, and do a debug gl pass. --- indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl | 2 +- .../newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'indra/newview/app_settings/shaders/class2/interface') diff --git a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl index d21af946e0..0753e73dc8 100644 --- a/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl +++ b/indra/newview/app_settings/shaders/class2/interface/irradianceGenF.glsl @@ -209,6 +209,6 @@ void main() color = filterColor(vary_dir); - frag_color = color; + frag_color = max(color, vec4(0)); } diff --git a/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl b/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl index 986b233e0b..c858531998 100644 --- a/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl +++ b/indra/newview/app_settings/shaders/class2/interface/reflectionprobeF.glsl @@ -38,5 +38,5 @@ void main() float depth = getDepth(tc.xy); vec4 pos = getPositionWithDepth(tc, depth); - frag_color = sampleReflectionProbesDebug(pos.xyz); + frag_color = max(sampleReflectionProbesDebug(pos.xyz), vec4(0)); } -- cgit v1.2.3