diff options
Diffstat (limited to 'indra/newview')
| -rw-r--r-- | indra/newview/app_settings/shaders/class2/deferred/skyF.glsl | 102 |
1 files changed, 40 insertions, 62 deletions
diff --git a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl index 0c9892acad..b9e561c112 100644 --- a/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl +++ b/indra/newview/app_settings/shaders/class2/deferred/skyF.glsl @@ -92,110 +92,88 @@ void main() { // World / view / projection - // Get relative position - vec3 P = pos.xyz - camPosLocal.xyz + vec3(0,50,0); - - // Set altitude - if (P.y > 0.) - { - P *= (max_y / P.y); - } - else - { - P *= (-32000. / P.y); - } - - // Can normalize then - vec3 Pn = normalize(P); - float Plen = length(P); + // Get relative position (offset why?) + vec3 rel_pos = pos.xyz - camPosLocal.xyz + vec3(0,50,0); - // 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; + // Adj position vector to clamp altitude + if (rel_pos.y > 0.) { rel_pos *= (max_y / rel_pos.y); } + if (rel_pos.y < 0.) { rel_pos *= (-32000. / rel_pos.y); } + + // Normalized + vec3 rel_pos_norm = normalize(rel_pos); + float rel_pos_len = length(rel_pos); - float dens_mul = density_multiplier; + // Initialize temp variables + vec4 sunlight = (sun_up_factor == 1) ? sunlight_color : moonlight_color; // 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); + vec4 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 = dot(rel_pos_norm, lightnorm.xyz); + haze_glow = 1. - haze_glow; + // 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 : (sun_moon_glow_factor * (temp2.x + 0.25)); + haze_glow = (sun_moon_glow_factor < 1.0) ? 0.0 : (sun_moon_glow_factor * (haze_glow + 0.25)); // Haze color above cloud - vec4 color = ( blue_horizon * blue_weight * (sunlight + ambient_color) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + ambient_color) - ); + vec4 color = blue_horizon * blue_weight * (sunlight + 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; - tmpAmbient += max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5; + // TODO 9/20: DJH what does this do? max(0,(1-ambient)) will change the color + vec4 ambient = ambient_color + max(vec4(0), (1. - ambient_color)) * cloud_shadow * 0.5; // Dim sunlight by cloud shadow percentage sunlight *= max(0.0, (1. - cloud_shadow)); // Haze color below cloud - vec4 additiveColorBelowCloud = (blue_horizon * blue_weight * (sunlight + tmpAmbient) - + (haze_horizon * haze_weight) * (sunlight * temp2.x + tmpAmbient) - ); - - + vec4 add_below_cloud = blue_horizon * blue_weight * (sunlight + ambient) + + haze_horizon * haze_weight * (sunlight * haze_glow + ambient); // 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 += (add_below_cloud - color) * (1. - sqrt(combined_haze)); - float optic_d = dot(Pn, lightnorm.xyz); - + float optic_d = dot(rel_pos_norm, lightnorm.xyz); vec3 halo_22 = halo22(optic_d); - color.rgb += rainbow(optic_d); - color.rgb += halo_22; - color.rgb *= 2.; color.rgb = scaleSoftClip(color.rgb); - /// Gamma correct for WL (soft clip effect). + // Gamma correct for WL (soft clip effect). frag_data[0] = vec4(color.rgb, 1.0); frag_data[1] = vec4(0.0,0.0,0.0,0.0); frag_data[2] = vec4(0.0,0.0,0.0,1.0); //1.0 in norm.w masks off fog |