126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/**
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* @ Version: SCREEN SPACE SHADERS - UPDATE 11.3
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* @ Description: SSS implementation
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* @ Modified time: 2023-12-11 08:23
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* @ Author: https://www.moddb.com/members/ascii1457
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* @ Mod: https://www.moddb.com/mods/stalker-anomaly/addons/screen-space-shaders
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*/
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#include "screenspace_common.h"
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#include "settings_screenspace_SSS.h"
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float SSFX_ScreenSpaceShadows_Far(float4 P, float2 tc, uint iSample)
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{
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if ( abs(P.w - MAT_FLORA) > 0.03f )
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return 1;
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// Light vector
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float3 L_dir = mul(m_V, float4(-normalize(L_sun_dir_w), 0)).xyz;
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RayTrace sss_ray = SSFX_ray_init(P.xyz, L_dir, 2.5, 2, 1);
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[unroll (2)]
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for (int i = 0; i < 2; i++)
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{
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// Break the march if ray go out of screen...
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if (!SSFX_is_valid_uv(sss_ray.r_pos))
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return 1;
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// Sample current ray pos ( x = difference | y = sample depth | z = current ray len )
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float3 depth_ray = SSFX_ray_intersect(sss_ray, iSample);
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// Check depth difference
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float diff = depth_ray.x;
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// No Sky
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diff *= depth_ray.y > SKY_EPS;
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// Negative: Ray is closer to the camera ( not occluded )
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// Positive: Ray is beyond the depth sample ( occluded )
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if (diff > 0 && diff < 3)
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{
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return 0;
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}
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// Step the ray
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sss_ray.r_pos += sss_ray.r_step;
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}
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return 1;
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}
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float SSFX_ScreenSpaceShadows(float4 P, float2 tc, uint iSample)
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{
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// Light vector
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float3 L_dir = mul(m_V, float4(-normalize(L_sun_dir_w), 0)).xyz;
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// Material conditions...
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bool mat_flora = abs(P.w - MAT_FLORA) <= 0.02f;
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bool mat_terrain = abs(P.w - 0.95f) <= 0.02f;
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// Weapons mask. Depth below or equal to 1.2
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bool weapon_mask = P.z >= 1.2f;
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// Weapon Factor.
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float pLen = length(P.z);
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float wpn_f = smoothstep(G_SSDO_WEAPON_LENGTH * 0.75f, G_SSDO_WEAPON_LENGTH, pLen);
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//wpn_f = saturate(wpn_f + mat_terrain);
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// Adjust Settings for weapons and scene.
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float ray_hardness = lerp(10.0f * G_SSDO_WEAPON_HARDNESS, 15.0f * G_SSDO_SCENARY_HARDNESS, wpn_f);
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float ray_detail = clamp(pLen * 0.003f, G_SSS_DETAILS, 10);
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float ray_thick = (0.3f - wpn_f * 0.23f) + (pLen * 0.001f * wpn_f);
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float ray_len = lerp(G_SSDO_WEAPON_SHADOW_LENGTH, G_SSDO_SCENARY_SHADOW_LENGTH, wpn_f);
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// Grass overwrite. ( Sadly some weapons use MAT_FLORA, let's remove low depth values from the overwrite )
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if (mat_flora && weapon_mask)
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{
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ray_hardness = G_SSDO_GRASS_HARDNESS * 5.0f;
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ray_len = G_SSDO_GRASS_SHADOW_LENGTH;
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}
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if (ray_hardness <= 0)
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return 1.0f;
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RayTrace sss_ray = SSFX_ray_init(P, L_dir, ray_len, G_SSS_STEPS, SSFX_noise(tc));
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float fade_len = 1.0f + sss_ray.r_step;
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float shadow = 0;
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[unroll (G_SSS_STEPS)]
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for (int i = 0; i < G_SSS_STEPS; i++)
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{
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// Break the march if ray go out of screen...
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if (!SSFX_is_valid_uv(sss_ray.r_pos))
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break;
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// Sample current ray pos ( x = difference | y = sample depth | z = current ray len )
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float3 depth_ray = SSFX_ray_intersect(sss_ray, iSample);
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// Check depth difference
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float diff = depth_ray.x;
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// No Sky
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diff *= depth_ray.y > SKY_EPS;
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// Disable weapons at some point to avoid wrong shadows on the ground
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if (weapon_mask)
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diff *= depth_ray.y >= 1.0f;
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// Negative: Ray is closer to the camera ( not occluded )
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// Positive: Ray is beyond the depth sample ( occluded )
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if (diff > ray_detail && diff < ray_thick)
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{
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shadow += (fade_len - depth_ray.z) * (1.0f - smoothstep( G_SSS_STEPS * G_SSS_FORCE_FADE, G_SSS_STEPS + 1, i));
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}
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// Step the ray
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sss_ray.r_pos += sss_ray.r_step;
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}
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// Calc shadow and return.
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return 1.0f - saturate(shadow * (1.0f / G_SSS_STEPS) * ray_hardness) * G_SSS_INTENSITY;
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} |