From 0f80162dcf0f669630e8e338e358910b95cac196 Mon Sep 17 00:00:00 2001 From: Dave Houlton Date: Fri, 28 Aug 2020 10:33:48 -0600 Subject: SL-13768 de-obfuscate cloud/sky vertex shaders --- .../shaders/class2/windlight/cloudsV.glsl | 76 ++++++++++------------ .../shaders/class2/windlight/skyV.glsl | 64 ++++++++---------- 2 files changed, 61 insertions(+), 79 deletions(-) (limited to 'indra/newview/app_settings/shaders/class2/windlight') diff --git a/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl b/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl index 7d736b8fcc..e4c36ee657 100644 --- a/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl +++ b/indra/newview/app_settings/shaders/class2/windlight/cloudsV.glsl @@ -94,75 +94,66 @@ void main() vary_texcoord3 = vary_texcoord1 * 16.; // Get relative position - vec3 P = position.xyz - camPosLocal.xyz + vec3(0,50,0); + vec3 rel_pos = position.xyz - camPosLocal.xyz + vec3(0,50,0); // fade clouds beyond a certain point so the bottom of the sky dome doesn't look silly at high altitude - altitude_blend_factor = clamp((P.y + 512.0) / max_y, 0.0, 1.0); + altitude_blend_factor = clamp((rel_pos.y + 512.0) / max_y, 0.0, 1.0); // Set altitude - if (P.y > 0.) + if (rel_pos.y > 0.) { - P *= (max_y / P.y); + rel_pos *= (max_y / rel_pos.y); } else { - P *= (-32000. / P.y); + rel_pos *= (-32000. / rel_pos.y); } // Can normalize then - vec3 Pn = normalize(P); - float Plen = length(P); + vec3 rel_pos_norm = normalize(rel_pos); + float rel_pos_len = length(rel_pos); // Initialize temp variables - vec4 temp1 = vec4(0.); - vec4 temp2 = vec4(0.); - vec4 blue_weight; - vec4 haze_weight; - //vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color; vec4 sunlight = sunlight_color; vec4 light_atten; - float dens_mul = density_multiplier; - // Sunlight attenuation effect (hue and brightness) due to atmosphere // this is used later for sunlight modulation at various altitudes - light_atten = (blue_density + vec4(haze_density * 0.25)) * (dens_mul * max_y); + light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y); // Calculate relative weights - temp1 = abs(blue_density) + vec4(abs(haze_density)); - blue_weight = blue_density / temp1; - haze_weight = haze_density / temp1; + vec4 combined_haze = abs(blue_density) + vec4(abs(haze_density)); + vec4 blue_weight = blue_density / combined_haze; + vec4 haze_weight = haze_density / combined_haze; - // Compute sunlight from P & lightnorm (for long rays like sky) - temp2.y = max(0., max(0., Pn.y) * 1.0 + lightnorm.y ); - temp2.y = 1. / temp2.y; - sunlight *= exp( - light_atten * temp2.y); + // Compute sunlight from rel_pos & lightnorm (for long rays like sky) + float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y); + sunlight *= exp( - light_atten * off_axis); // Distance - temp2.z = Plen * dens_mul; + float density_dist = rel_pos_len * density_multiplier; - // Transparency (-> temp1) - // ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati + // Transparency (-> combined_haze) + // ATI Bugfix -- can't store combined_haze*density_dist in a variable because the ati // compiler gets confused. - temp1 = exp(-temp1 * temp2.z); + combined_haze = exp(-combined_haze * density_dist); // Compute haze glow - temp2.x = dot(Pn, lightnorm.xyz); - temp2.x = 1. - temp2.x; - // temp2.x is 0 at the sun and increases away from sun - temp2.x = max(temp2.x, .001); + float haze_glow = 1.0 - dot(rel_pos_norm, lightnorm.xyz); + // haze_glow is 0 at the sun and increases away from sun + haze_glow = max(haze_glow, .001); // Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot) - temp2.x *= glow.x; + haze_glow *= glow.x; // Higher glow.x gives dimmer glow (because next step is 1 / "angle") - temp2.x = pow(temp2.x, glow.z); + haze_glow = pow(haze_glow, glow.z); // glow.z should be negative, so we're doing a sort of (1 / "angle") function - temp2.x *= sun_moon_glow_factor; + haze_glow *= sun_moon_glow_factor; // Add "minimum anti-solar illumination" // For sun, add to glow. For moon, remove glow entirely. SL-13768 - temp2.x = (sun_moon_glow_factor < 1.0) ? 0.0 : (temp2.x + 0.25); + haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (haze_glow + 0.25); // Increase ambient when there are more clouds vec4 tmpAmbient = ambient_color; @@ -173,23 +164,22 @@ void main() // Haze color below cloud vec4 additiveColorBelowCloud = ( blue_horizon * blue_weight * (sunlight + tmpAmbient) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + tmpAmbient) + + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient) ); // CLOUDS - temp2.y = max(0., lightnorm.y * 2.); - temp2.y = 1. / temp2.y; - sunlight *= exp( - light_atten * temp2.y); + off_axis = 1.0 / max(1e-6, lightnorm.y * 2.); + sunlight *= exp( - light_atten * off_axis); // Cloud color out - vary_CloudColorSun = (sunlight * temp2.x) * cloud_color; + vary_CloudColorSun = (sunlight * haze_glow) * cloud_color; vary_CloudColorAmbient = tmpAmbient * cloud_color; // Attenuate cloud color by atmosphere - temp1 = sqrt(temp1); //less atmos opacity (more transparency) below clouds - vary_CloudColorSun *= temp1; - vary_CloudColorAmbient *= temp1; - vec4 oHazeColorBelowCloud = additiveColorBelowCloud * (1. - temp1); + combined_haze = sqrt(combined_haze); //less atmos opacity (more transparency) below clouds + vary_CloudColorSun *= combined_haze; + vary_CloudColorAmbient *= combined_haze; + vec4 oHazeColorBelowCloud = additiveColorBelowCloud * (1. - combined_haze); // Make a nice cloud density based on the cloud_shadow value that was passed in. vary_CloudDensity = 2. * (cloud_shadow - 0.25); diff --git a/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl b/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl index 1361f6a11d..1ee9c33c1a 100644 --- a/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl +++ b/indra/newview/app_settings/shaders/class2/windlight/skyV.glsl @@ -66,77 +66,69 @@ void main() gl_Position = pos; // Get relative position - vec3 P = position.xyz - camPosLocal.xyz + vec3(0,50,0); + vec3 rel_pos = position.xyz - camPosLocal.xyz + vec3(0,50,0); // Set altitude - if (P.y > 0.) + if (rel_pos.y > 0.) { - P *= (max_y / P.y); + rel_pos *= (max_y / rel_pos.y); } else { - P *= (-32000. / P.y); + rel_pos *= (-32000. / rel_pos.y); } // Can normalize then - vec3 Pn = normalize(P); + vec3 rel_pos_norm = normalize(rel_pos); - float Plen = length(P); + float rel_pos_len = length(rel_pos); // Initialize temp variables - vec4 temp1 = vec4(0.); - vec4 temp2 = vec4(0.); - vec4 blue_weight; - vec4 haze_weight; vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color; vec4 light_atten; - float dens_mul = density_multiplier; - // Sunlight attenuation effect (hue and brightness) due to atmosphere // this is used later for sunlight modulation at various altitudes - light_atten = (blue_density + vec4(haze_density * 0.25)) * (dens_mul * max_y); + light_atten = (blue_density + vec4(haze_density * 0.25)) * (density_multiplier * max_y); // Calculate relative weights - temp1 = abs(blue_density) + vec4(abs(haze_density)); - blue_weight = blue_density / temp1; - haze_weight = haze_density / temp1; + vec4 combined_haze = abs(blue_density) + vec4(abs(haze_density)); + vec4 blue_weight = blue_density / combined_haze; + vec4 haze_weight = haze_density / combined_haze; - // Compute sunlight from P & lightnorm (for long rays like sky) - temp2.y = max(0., max(0., Pn.y) * 1.0 + lightnorm.y ); - temp2.y = 1. / temp2.y; - sunlight *= exp( - light_atten * temp2.y); + // Compute sunlight from rel_pos & lightnorm (for long rays like sky) + float off_axis = 1.0 / max(1e-6, max(0., rel_pos_norm.y) + lightnorm.y); + sunlight *= exp( - light_atten * off_axis); // Distance - temp2.z = Plen * dens_mul; + float density_dist = rel_pos_len * density_multiplier; - // Transparency (-> temp1) - // ATI Bugfix -- can't store temp1*temp2.z in a variable because the ati + // Transparency (-> combined_haze) + // ATI Bugfix -- can't store combined_haze*density_dist in a variable because the ati // compiler gets confused. - temp1 = exp(-temp1 * temp2.z); + combined_haze = exp(-combined_haze * density_dist); // Compute haze glow - temp2.x = dot(Pn, lightnorm.xyz); - temp2.x = 1. - temp2.x; - // temp2.x is 0 at the sun and increases away from sun - temp2.x = max(temp2.x, .001); + float haze_glow = 1.0 - dot(rel_pos_norm, lightnorm.xyz); + // haze_glow is 0 at the sun and increases away from sun + haze_glow = max(haze_glow, .001); // Set a minimum "angle" (smaller glow.y allows tighter, brighter hotspot) - temp2.x *= glow.x; + haze_glow *= glow.x; // Higher glow.x gives dimmer glow (because next step is 1 / "angle") - temp2.x = pow(temp2.x, glow.z); + haze_glow = pow(haze_glow, glow.z); // glow.z should be negative, so we're doing a sort of (1 / "angle") function // Add "minimum anti-solar illumination" // For sun, add to glow. For moon, remove glow entirely. SL-13768 - temp2.x = (sun_moon_glow_factor < 1.0) ? 0.0 : (temp2.x + 0.25); + haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (haze_glow + 0.25); vec4 color = ( blue_horizon * blue_weight * (sunlight + ambient_color) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + ambient_color) + + (haze_horizon * haze_weight) * (sunlight * haze_glow + ambient_color) ); // Final atmosphere additive - color *= (1. - temp1); + color *= (1. - combined_haze); // Increase ambient when there are more clouds vec4 tmpAmbient = ambient_color; @@ -147,14 +139,14 @@ void main() // Haze color below cloud vec4 additiveColorBelowCloud = ( blue_horizon * blue_weight * (sunlight + tmpAmbient) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + tmpAmbient) + + (haze_horizon * haze_weight) * (sunlight * haze_glow + tmpAmbient) ); // Attenuate cloud color by atmosphere - temp1 = sqrt(temp1); //less atmos opacity (more transparency) below clouds + combined_haze = sqrt(combined_haze); //less atmos opacity (more transparency) below clouds // At horizon, blend high altitude sky color towards the darker color below the clouds - color += (additiveColorBelowCloud - color) * (1. - sqrt(temp1)); + color += (additiveColorBelowCloud - color) * (1. - sqrt(combined_haze)); // Haze color above cloud vary_HazeColor = color; -- cgit v1.2.3