3b11e33a09
Sets `AlignOperands` to `DontAlign`. `clang-format` developers seem to mostly care about space-based indentation and every other version of clang-format breaks the bad mismatch of tabs and spaces that it seems to use for operand alignment. So it's better without, so that it respects our two-tabs `ContinuationIndentWidth`.
1038 lines
34 KiB
GLSL
1038 lines
34 KiB
GLSL
// Functions related to lighting
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// This returns the G_GGX function divided by 2 cos_theta_m, where in practice cos_theta_m is either N.L or N.V.
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// We're dividing this factor off because the overall term we'll end up looks like
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// (see, for example, the first unnumbered equation in B. Burley, "Physically Based Shading at Disney", SIGGRAPH 2012):
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//
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// F(L.V) D(N.H) G(N.L) G(N.V) / (4 N.L N.V)
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//
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// We're basically regouping this as
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//
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// F(L.V) D(N.H) [G(N.L)/(2 N.L)] [G(N.V) / (2 N.V)]
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//
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// and thus, this function implements the [G(N.m)/(2 N.m)] part with m = L or V.
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//
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// The contents of the D and G (G1) functions (GGX) are taken from
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// E. Heitz, "Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs", J. Comp. Graph. Tech. 3 (2) (2014).
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// Eqns 71-72 and 85-86 (see also Eqns 43 and 80).
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float G_GGX_2cos(float cos_theta_m, float alpha) {
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// Schlick's approximation
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// C. Schlick, "An Inexpensive BRDF Model for Physically-based Rendering", Computer Graphics Forum. 13 (3): 233 (1994)
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// Eq. (19), although see Heitz (2014) the about the problems with his derivation.
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// It nevertheless approximates GGX well with k = alpha/2.
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float k = 0.5 * alpha;
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return 0.5 / (cos_theta_m * (1.0 - k) + k);
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// float cos2 = cos_theta_m * cos_theta_m;
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// float sin2 = (1.0 - cos2);
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// return 1.0 / (cos_theta_m + sqrt(cos2 + alpha * alpha * sin2));
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}
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float D_GGX(float cos_theta_m, float alpha) {
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float alpha2 = alpha * alpha;
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float d = 1.0 + (alpha2 - 1.0) * cos_theta_m * cos_theta_m;
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return alpha2 / (M_PI * d * d);
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}
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float G_GGX_anisotropic_2cos(float cos_theta_m, float alpha_x, float alpha_y, float cos_phi, float sin_phi) {
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float cos2 = cos_theta_m * cos_theta_m;
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float sin2 = (1.0 - cos2);
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float s_x = alpha_x * cos_phi;
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float s_y = alpha_y * sin_phi;
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return 1.0 / max(cos_theta_m + sqrt(cos2 + (s_x * s_x + s_y * s_y) * sin2), 0.001);
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}
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float D_GGX_anisotropic(float cos_theta_m, float alpha_x, float alpha_y, float cos_phi, float sin_phi) {
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float cos2 = cos_theta_m * cos_theta_m;
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float sin2 = (1.0 - cos2);
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float r_x = cos_phi / alpha_x;
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float r_y = sin_phi / alpha_y;
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float d = cos2 + sin2 * (r_x * r_x + r_y * r_y);
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return 1.0 / max(M_PI * alpha_x * alpha_y * d * d, 0.001);
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}
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float SchlickFresnel(float u) {
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float m = 1.0 - u;
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float m2 = m * m;
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return m2 * m2 * m; // pow(m,5)
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}
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float GTR1(float NdotH, float a) {
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if (a >= 1.0)
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return 1.0 / M_PI;
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float a2 = a * a;
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float t = 1.0 + (a2 - 1.0) * NdotH * NdotH;
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return (a2 - 1.0) / (M_PI * log(a2) * t);
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}
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vec3 F0(float metallic, float specular, vec3 albedo) {
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float dielectric = 0.16 * specular * specular;
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// use albedo * metallic as colored specular reflectance at 0 angle for metallic materials;
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// see https://google.github.io/filament/Filament.md.html
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return mix(vec3(dielectric), albedo, vec3(metallic));
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}
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void light_compute(vec3 N, vec3 L, vec3 V, float A, vec3 light_color, float attenuation, vec3 f0, uint orms, float specular_amount,
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#ifdef LIGHT_BACKLIGHT_USED
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vec3 backlight,
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#endif
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#ifdef LIGHT_TRANSMITTANCE_USED
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vec4 transmittance_color,
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float transmittance_depth,
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float transmittance_boost,
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float transmittance_z,
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#endif
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#ifdef LIGHT_RIM_USED
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float rim, float rim_tint, vec3 rim_color,
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#endif
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#ifdef LIGHT_CLEARCOAT_USED
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float clearcoat, float clearcoat_gloss,
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#endif
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#ifdef LIGHT_ANISOTROPY_USED
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vec3 B, vec3 T, float anisotropy,
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#endif
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#ifdef USE_SHADOW_TO_OPACITY
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inout float alpha,
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#endif
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inout vec3 diffuse_light, inout vec3 specular_light) {
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vec4 orms_unpacked = unpackUnorm4x8(orms);
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float roughness = orms_unpacked.y;
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float metallic = orms_unpacked.z;
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#if defined(LIGHT_CODE_USED)
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// light is written by the light shader
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vec3 normal = N;
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vec3 light = L;
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vec3 view = V;
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#CODE : LIGHT
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#else
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float NdotL = min(A + dot(N, L), 1.0);
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float cNdotL = max(NdotL, 0.0); // clamped NdotL
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float NdotV = dot(N, V);
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float cNdotV = max(NdotV, 0.0);
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#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_CLEARCOAT_USED)
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vec3 H = normalize(V + L);
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#endif
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#if defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_CLEARCOAT_USED)
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float cNdotH = clamp(A + dot(N, H), 0.0, 1.0);
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#endif
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#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_CLEARCOAT_USED)
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float cLdotH = clamp(A + dot(L, H), 0.0, 1.0);
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#endif
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if (metallic < 1.0) {
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float diffuse_brdf_NL; // BRDF times N.L for calculating diffuse radiance
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#if defined(DIFFUSE_LAMBERT_WRAP)
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// energy conserving lambert wrap shader
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diffuse_brdf_NL = max(0.0, (NdotL + roughness) / ((1.0 + roughness) * (1.0 + roughness)));
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#elif defined(DIFFUSE_TOON)
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diffuse_brdf_NL = smoothstep(-roughness, max(roughness, 0.01), NdotL);
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#elif defined(DIFFUSE_BURLEY)
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{
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float FD90_minus_1 = 2.0 * cLdotH * cLdotH * roughness - 0.5;
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float FdV = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotV);
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float FdL = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotL);
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diffuse_brdf_NL = (1.0 / M_PI) * FdV * FdL * cNdotL;
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/*
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float energyBias = mix(roughness, 0.0, 0.5);
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float energyFactor = mix(roughness, 1.0, 1.0 / 1.51);
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float fd90 = energyBias + 2.0 * VoH * VoH * roughness;
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float f0 = 1.0;
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float lightScatter = f0 + (fd90 - f0) * pow(1.0 - cNdotL, 5.0);
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float viewScatter = f0 + (fd90 - f0) * pow(1.0 - cNdotV, 5.0);
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diffuse_brdf_NL = lightScatter * viewScatter * energyFactor;
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*/
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}
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#else
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// lambert
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diffuse_brdf_NL = cNdotL * (1.0 / M_PI);
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#endif
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diffuse_light += light_color * diffuse_brdf_NL * attenuation;
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#if defined(LIGHT_BACKLIGHT_USED)
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diffuse_light += light_color * (vec3(1.0 / M_PI) - diffuse_brdf_NL) * backlight * attenuation;
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#endif
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#if defined(LIGHT_RIM_USED)
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float rim_light = pow(max(0.0, 1.0 - cNdotV), max(0.0, (1.0 - roughness) * 16.0));
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diffuse_light += rim_light * rim * mix(vec3(1.0), rim_color, rim_tint) * light_color;
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#endif
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#ifdef LIGHT_TRANSMITTANCE_USED
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{
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#ifdef SSS_MODE_SKIN
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float scale = 8.25 / transmittance_depth;
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float d = scale * abs(transmittance_z);
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float dd = -d * d;
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vec3 profile = vec3(0.233, 0.455, 0.649) * exp(dd / 0.0064) +
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vec3(0.1, 0.336, 0.344) * exp(dd / 0.0484) +
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vec3(0.118, 0.198, 0.0) * exp(dd / 0.187) +
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vec3(0.113, 0.007, 0.007) * exp(dd / 0.567) +
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vec3(0.358, 0.004, 0.0) * exp(dd / 1.99) +
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vec3(0.078, 0.0, 0.0) * exp(dd / 7.41);
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diffuse_light += profile * transmittance_color.a * light_color * clamp(transmittance_boost - NdotL, 0.0, 1.0) * (1.0 / M_PI);
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#else
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float scale = 8.25 / transmittance_depth;
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float d = scale * abs(transmittance_z);
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float dd = -d * d;
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diffuse_light += exp(dd) * transmittance_color.rgb * transmittance_color.a * light_color * clamp(transmittance_boost - NdotL, 0.0, 1.0) * (1.0 / M_PI);
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#endif
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}
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#else
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#endif //LIGHT_TRANSMITTANCE_USED
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}
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if (roughness > 0.0) { // FIXME: roughness == 0 should not disable specular light entirely
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// D
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#if defined(SPECULAR_BLINN)
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//normalized blinn
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float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
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float blinn = pow(cNdotH, shininess);
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blinn *= (shininess + 2.0) * (1.0 / (8.0 * M_PI));
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specular_light += light_color * attenuation * specular_amount * blinn * f0 * orms_unpacked.w;
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#elif defined(SPECULAR_PHONG)
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vec3 R = normalize(-reflect(L, N));
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float cRdotV = clamp(A + dot(R, V), 0.0, 1.0);
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float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
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float phong = pow(cRdotV, shininess);
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phong *= (shininess + 1.0) * (1.0 / (8.0 * M_PI));
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specular_light += light_color * attenuation * specular_amount * phong * f0 * orms_unpacked.w;
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#elif defined(SPECULAR_TOON)
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vec3 R = normalize(-reflect(L, N));
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float RdotV = dot(R, V);
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float mid = 1.0 - roughness;
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mid *= mid;
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float intensity = smoothstep(mid - roughness * 0.5, mid + roughness * 0.5, RdotV) * mid;
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diffuse_light += light_color * intensity * attenuation * specular_amount; // write to diffuse_light, as in toon shading you generally want no reflection
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#elif defined(SPECULAR_DISABLED)
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// none..
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#elif defined(SPECULAR_SCHLICK_GGX)
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// shlick+ggx as default
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#if defined(LIGHT_ANISOTROPY_USED)
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float alpha_ggx = roughness * roughness;
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float aspect = sqrt(1.0 - anisotropy * 0.9);
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float ax = alpha_ggx / aspect;
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float ay = alpha_ggx * aspect;
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float XdotH = dot(T, H);
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float YdotH = dot(B, H);
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float D = D_GGX_anisotropic(cNdotH, ax, ay, XdotH, YdotH);
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float G = G_GGX_anisotropic_2cos(cNdotL, ax, ay, XdotH, YdotH) * G_GGX_anisotropic_2cos(cNdotV, ax, ay, XdotH, YdotH);
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#else
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float alpha_ggx = roughness * roughness;
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float D = D_GGX(cNdotH, alpha_ggx);
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float G = G_GGX_2cos(cNdotL, alpha_ggx) * G_GGX_2cos(cNdotV, alpha_ggx);
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#endif
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// F
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float cLdotH5 = SchlickFresnel(cLdotH);
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vec3 F = mix(vec3(cLdotH5), vec3(1.0), f0);
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vec3 specular_brdf_NL = cNdotL * D * F * G;
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specular_light += specular_brdf_NL * light_color * attenuation * specular_amount;
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#endif
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#if defined(LIGHT_CLEARCOAT_USED)
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#if !defined(SPECULAR_SCHLICK_GGX)
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float cLdotH5 = SchlickFresnel(cLdotH);
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#endif
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float Dr = GTR1(cNdotH, mix(.1, .001, clearcoat_gloss));
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float Fr = mix(.04, 1.0, cLdotH5);
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float Gr = G_GGX_2cos(cNdotL, .25) * G_GGX_2cos(cNdotV, .25);
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float clearcoat_specular_brdf_NL = 0.25 * clearcoat * Gr * Fr * Dr * cNdotL;
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specular_light += clearcoat_specular_brdf_NL * light_color * attenuation * specular_amount;
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#endif
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}
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#ifdef USE_SHADOW_TO_OPACITY
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alpha = min(alpha, clamp(1.0 - attenuation, 0.0, 1.0));
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#endif
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#endif //defined(LIGHT_CODE_USED)
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}
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#ifndef SHADOWS_DISABLED
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// Interleaved Gradient Noise
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// https://www.iryoku.com/next-generation-post-processing-in-call-of-duty-advanced-warfare
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float quick_hash(vec2 pos) {
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const vec3 magic = vec3(0.06711056f, 0.00583715f, 52.9829189f);
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return fract(magic.z * fract(dot(pos, magic.xy)));
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}
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float sample_directional_pcf_shadow(texture2D shadow, vec2 shadow_pixel_size, vec4 coord) {
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vec2 pos = coord.xy;
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float depth = coord.z;
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//if only one sample is taken, take it from the center
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if (sc_directional_soft_shadow_samples == 0) {
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return textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(pos, depth, 1.0));
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}
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mat2 disk_rotation;
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{
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float r = quick_hash(gl_FragCoord.xy) * 2.0 * M_PI;
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float sr = sin(r);
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float cr = cos(r);
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disk_rotation = mat2(vec2(cr, -sr), vec2(sr, cr));
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}
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float avg = 0.0;
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for (uint i = 0; i < sc_directional_soft_shadow_samples; i++) {
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avg += textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(pos + shadow_pixel_size * (disk_rotation * scene_data.directional_soft_shadow_kernel[i].xy), depth, 1.0));
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}
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return avg * (1.0 / float(sc_directional_soft_shadow_samples));
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}
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float sample_pcf_shadow(texture2D shadow, vec2 shadow_pixel_size, vec3 coord) {
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vec2 pos = coord.xy;
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float depth = coord.z;
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//if only one sample is taken, take it from the center
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if (sc_soft_shadow_samples == 0) {
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return textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(pos, depth, 1.0));
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}
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mat2 disk_rotation;
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{
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float r = quick_hash(gl_FragCoord.xy) * 2.0 * M_PI;
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float sr = sin(r);
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float cr = cos(r);
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disk_rotation = mat2(vec2(cr, -sr), vec2(sr, cr));
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}
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float avg = 0.0;
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for (uint i = 0; i < sc_soft_shadow_samples; i++) {
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avg += textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(pos + shadow_pixel_size * (disk_rotation * scene_data.soft_shadow_kernel[i].xy), depth, 1.0));
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}
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return avg * (1.0 / float(sc_soft_shadow_samples));
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}
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float sample_omni_pcf_shadow(texture2D shadow, float blur_scale, vec2 coord, vec4 uv_rect, vec2 flip_offset, float depth) {
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//if only one sample is taken, take it from the center
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if (sc_soft_shadow_samples == 0) {
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vec2 pos = coord * 0.5 + 0.5;
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pos = uv_rect.xy + pos * uv_rect.zw;
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return textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(pos, depth, 1.0));
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}
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mat2 disk_rotation;
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{
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float r = quick_hash(gl_FragCoord.xy) * 2.0 * M_PI;
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float sr = sin(r);
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float cr = cos(r);
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disk_rotation = mat2(vec2(cr, -sr), vec2(sr, cr));
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}
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float avg = 0.0;
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vec2 offset_scale = blur_scale * 2.0 * scene_data.shadow_atlas_pixel_size / uv_rect.zw;
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for (uint i = 0; i < sc_soft_shadow_samples; i++) {
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vec2 offset = offset_scale * (disk_rotation * scene_data.soft_shadow_kernel[i].xy);
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vec2 sample_coord = coord + offset;
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float sample_coord_length_sqaured = dot(sample_coord, sample_coord);
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bool do_flip = sample_coord_length_sqaured > 1.0;
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if (do_flip) {
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float len = sqrt(sample_coord_length_sqaured);
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sample_coord = sample_coord * (2.0 / len - 1.0);
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}
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sample_coord = sample_coord * 0.5 + 0.5;
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sample_coord = uv_rect.xy + sample_coord * uv_rect.zw;
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if (do_flip) {
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sample_coord += flip_offset;
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}
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avg += textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(sample_coord, depth, 1.0));
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}
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return avg * (1.0 / float(sc_soft_shadow_samples));
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}
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float sample_directional_soft_shadow(texture2D shadow, vec3 pssm_coord, vec2 tex_scale) {
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//find blocker
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float blocker_count = 0.0;
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float blocker_average = 0.0;
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mat2 disk_rotation;
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{
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float r = quick_hash(gl_FragCoord.xy) * 2.0 * M_PI;
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float sr = sin(r);
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float cr = cos(r);
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disk_rotation = mat2(vec2(cr, -sr), vec2(sr, cr));
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}
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for (uint i = 0; i < sc_directional_penumbra_shadow_samples; i++) {
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vec2 suv = pssm_coord.xy + (disk_rotation * scene_data.directional_penumbra_shadow_kernel[i].xy) * tex_scale;
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float d = textureLod(sampler2D(shadow, material_samplers[SAMPLER_LINEAR_CLAMP]), suv, 0.0).r;
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if (d < pssm_coord.z) {
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blocker_average += d;
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blocker_count += 1.0;
|
|
}
|
|
}
|
|
|
|
if (blocker_count > 0.0) {
|
|
//blockers found, do soft shadow
|
|
blocker_average /= blocker_count;
|
|
float penumbra = (pssm_coord.z - blocker_average) / blocker_average;
|
|
tex_scale *= penumbra;
|
|
|
|
float s = 0.0;
|
|
for (uint i = 0; i < sc_directional_penumbra_shadow_samples; i++) {
|
|
vec2 suv = pssm_coord.xy + (disk_rotation * scene_data.directional_penumbra_shadow_kernel[i].xy) * tex_scale;
|
|
s += textureProj(sampler2DShadow(shadow, shadow_sampler), vec4(suv, pssm_coord.z, 1.0));
|
|
}
|
|
|
|
return s / float(sc_directional_penumbra_shadow_samples);
|
|
|
|
} else {
|
|
//no blockers found, so no shadow
|
|
return 1.0;
|
|
}
|
|
}
|
|
|
|
#endif // SHADOWS_DISABLED
|
|
|
|
float get_omni_attenuation(float distance, float inv_range, float decay) {
|
|
float nd = distance * inv_range;
|
|
nd *= nd;
|
|
nd *= nd; // nd^4
|
|
nd = max(1.0 - nd, 0.0);
|
|
nd *= nd; // nd^2
|
|
return nd * pow(max(distance, 0.0001), -decay);
|
|
}
|
|
|
|
float light_process_omni_shadow(uint idx, vec3 vertex, vec3 normal) {
|
|
#ifndef SHADOWS_DISABLED
|
|
if (omni_lights.data[idx].shadow_enabled) {
|
|
// there is a shadowmap
|
|
vec2 texel_size = scene_data.shadow_atlas_pixel_size;
|
|
vec4 base_uv_rect = omni_lights.data[idx].atlas_rect;
|
|
base_uv_rect.xy += texel_size;
|
|
base_uv_rect.zw -= texel_size * 2.0;
|
|
|
|
// Omni lights use direction.xy to store to store the offset between the two paraboloid regions
|
|
vec2 flip_offset = omni_lights.data[idx].direction.xy;
|
|
|
|
vec3 local_vert = (omni_lights.data[idx].shadow_matrix * vec4(vertex, 1.0)).xyz;
|
|
|
|
float shadow_len = length(local_vert); //need to remember shadow len from here
|
|
vec3 shadow_dir = normalize(local_vert);
|
|
|
|
vec3 local_normal = normalize(mat3(omni_lights.data[idx].shadow_matrix) * normal);
|
|
vec3 normal_bias = local_normal * omni_lights.data[idx].shadow_normal_bias * (1.0 - abs(dot(local_normal, shadow_dir)));
|
|
|
|
float shadow;
|
|
|
|
if (sc_use_light_soft_shadows && omni_lights.data[idx].soft_shadow_size > 0.0) {
|
|
//soft shadow
|
|
|
|
//find blocker
|
|
|
|
float blocker_count = 0.0;
|
|
float blocker_average = 0.0;
|
|
|
|
mat2 disk_rotation;
|
|
{
|
|
float r = quick_hash(gl_FragCoord.xy) * 2.0 * M_PI;
|
|
float sr = sin(r);
|
|
float cr = cos(r);
|
|
disk_rotation = mat2(vec2(cr, -sr), vec2(sr, cr));
|
|
}
|
|
|
|
vec3 basis_normal = shadow_dir;
|
|
vec3 v0 = abs(basis_normal.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(0.0, 1.0, 0.0);
|
|
vec3 tangent = normalize(cross(v0, basis_normal));
|
|
vec3 bitangent = normalize(cross(tangent, basis_normal));
|
|
float z_norm = shadow_len * omni_lights.data[idx].inv_radius;
|
|
|
|
tangent *= omni_lights.data[idx].soft_shadow_size * omni_lights.data[idx].soft_shadow_scale;
|
|
bitangent *= omni_lights.data[idx].soft_shadow_size * omni_lights.data[idx].soft_shadow_scale;
|
|
|
|
for (uint i = 0; i < sc_penumbra_shadow_samples; i++) {
|
|
vec2 disk = disk_rotation * scene_data.penumbra_shadow_kernel[i].xy;
|
|
|
|
vec3 pos = local_vert + tangent * disk.x + bitangent * disk.y;
|
|
|
|
pos = normalize(pos);
|
|
|
|
vec4 uv_rect = base_uv_rect;
|
|
|
|
if (pos.z >= 0.0) {
|
|
uv_rect.xy += flip_offset;
|
|
}
|
|
|
|
pos.z = 1.0 + abs(pos.z);
|
|
pos.xy /= pos.z;
|
|
|
|
pos.xy = pos.xy * 0.5 + 0.5;
|
|
pos.xy = uv_rect.xy + pos.xy * uv_rect.zw;
|
|
|
|
float d = textureLod(sampler2D(shadow_atlas, material_samplers[SAMPLER_LINEAR_CLAMP]), pos.xy, 0.0).r;
|
|
if (d < z_norm) {
|
|
blocker_average += d;
|
|
blocker_count += 1.0;
|
|
}
|
|
}
|
|
|
|
if (blocker_count > 0.0) {
|
|
//blockers found, do soft shadow
|
|
blocker_average /= blocker_count;
|
|
float penumbra = (z_norm - blocker_average) / blocker_average;
|
|
tangent *= penumbra;
|
|
bitangent *= penumbra;
|
|
|
|
z_norm -= omni_lights.data[idx].inv_radius * omni_lights.data[idx].shadow_bias;
|
|
|
|
shadow = 0.0;
|
|
for (uint i = 0; i < sc_penumbra_shadow_samples; i++) {
|
|
vec2 disk = disk_rotation * scene_data.penumbra_shadow_kernel[i].xy;
|
|
vec3 pos = local_vert + tangent * disk.x + bitangent * disk.y;
|
|
|
|
pos = normalize(pos);
|
|
pos = normalize(pos + normal_bias);
|
|
|
|
vec4 uv_rect = base_uv_rect;
|
|
|
|
if (pos.z >= 0.0) {
|
|
uv_rect.xy += flip_offset;
|
|
}
|
|
|
|
pos.z = 1.0 + abs(pos.z);
|
|
pos.xy /= pos.z;
|
|
|
|
pos.xy = pos.xy * 0.5 + 0.5;
|
|
pos.xy = uv_rect.xy + pos.xy * uv_rect.zw;
|
|
shadow += textureProj(sampler2DShadow(shadow_atlas, shadow_sampler), vec4(pos.xy, z_norm, 1.0));
|
|
}
|
|
|
|
shadow /= float(sc_penumbra_shadow_samples);
|
|
|
|
} else {
|
|
//no blockers found, so no shadow
|
|
shadow = 1.0;
|
|
}
|
|
} else {
|
|
vec4 uv_rect = base_uv_rect;
|
|
|
|
vec3 shadow_sample = normalize(shadow_dir + normal_bias);
|
|
if (shadow_sample.z >= 0.0) {
|
|
uv_rect.xy += flip_offset;
|
|
flip_offset *= -1.0;
|
|
}
|
|
|
|
shadow_sample.z = 1.0 + abs(shadow_sample.z);
|
|
vec2 pos = shadow_sample.xy / shadow_sample.z;
|
|
float depth = shadow_len - omni_lights.data[idx].shadow_bias;
|
|
depth *= omni_lights.data[idx].inv_radius;
|
|
shadow = sample_omni_pcf_shadow(shadow_atlas, omni_lights.data[idx].soft_shadow_scale / shadow_sample.z, pos, uv_rect, flip_offset, depth);
|
|
}
|
|
|
|
return shadow;
|
|
}
|
|
#endif
|
|
|
|
return 1.0;
|
|
}
|
|
|
|
void light_process_omni(uint idx, vec3 vertex, vec3 eye_vec, vec3 normal, vec3 vertex_ddx, vec3 vertex_ddy, vec3 f0, uint orms, float shadow,
|
|
#ifdef LIGHT_BACKLIGHT_USED
|
|
vec3 backlight,
|
|
#endif
|
|
#ifdef LIGHT_TRANSMITTANCE_USED
|
|
vec4 transmittance_color,
|
|
float transmittance_depth,
|
|
float transmittance_boost,
|
|
#endif
|
|
#ifdef LIGHT_RIM_USED
|
|
float rim, float rim_tint, vec3 rim_color,
|
|
#endif
|
|
#ifdef LIGHT_CLEARCOAT_USED
|
|
float clearcoat, float clearcoat_gloss,
|
|
#endif
|
|
#ifdef LIGHT_ANISOTROPY_USED
|
|
vec3 binormal, vec3 tangent, float anisotropy,
|
|
#endif
|
|
#ifdef USE_SHADOW_TO_OPACITY
|
|
inout float alpha,
|
|
#endif
|
|
inout vec3 diffuse_light, inout vec3 specular_light) {
|
|
vec3 light_rel_vec = omni_lights.data[idx].position - vertex;
|
|
float light_length = length(light_rel_vec);
|
|
float omni_attenuation = get_omni_attenuation(light_length, omni_lights.data[idx].inv_radius, omni_lights.data[idx].attenuation);
|
|
float light_attenuation = omni_attenuation;
|
|
vec3 color = omni_lights.data[idx].color;
|
|
|
|
float size_A = 0.0;
|
|
|
|
if (sc_use_light_soft_shadows && omni_lights.data[idx].size > 0.0) {
|
|
float t = omni_lights.data[idx].size / max(0.001, light_length);
|
|
size_A = max(0.0, 1.0 - 1 / sqrt(1 + t * t));
|
|
}
|
|
|
|
#ifdef LIGHT_TRANSMITTANCE_USED
|
|
float transmittance_z = transmittance_depth; //no transmittance by default
|
|
transmittance_color.a *= light_attenuation;
|
|
{
|
|
vec4 clamp_rect = omni_lights.data[idx].atlas_rect;
|
|
|
|
//redo shadowmapping, but shrink the model a bit to avoid arctifacts
|
|
vec4 splane = (omni_lights.data[idx].shadow_matrix * vec4(vertex - normalize(normal_interp) * omni_lights.data[idx].transmittance_bias, 1.0));
|
|
|
|
float shadow_len = length(splane.xyz);
|
|
splane.xyz = normalize(splane.xyz);
|
|
|
|
if (splane.z >= 0.0) {
|
|
splane.z += 1.0;
|
|
clamp_rect.y += clamp_rect.w;
|
|
} else {
|
|
splane.z = 1.0 - splane.z;
|
|
}
|
|
|
|
splane.xy /= splane.z;
|
|
|
|
splane.xy = splane.xy * 0.5 + 0.5;
|
|
splane.z = shadow_len * omni_lights.data[idx].inv_radius;
|
|
splane.xy = clamp_rect.xy + splane.xy * clamp_rect.zw;
|
|
// splane.xy = clamp(splane.xy,clamp_rect.xy + scene_data.shadow_atlas_pixel_size,clamp_rect.xy + clamp_rect.zw - scene_data.shadow_atlas_pixel_size );
|
|
splane.w = 1.0; //needed? i think it should be 1 already
|
|
|
|
float shadow_z = textureLod(sampler2D(shadow_atlas, material_samplers[SAMPLER_LINEAR_CLAMP]), splane.xy, 0.0).r;
|
|
transmittance_z = (splane.z - shadow_z) / omni_lights.data[idx].inv_radius;
|
|
}
|
|
#endif
|
|
|
|
if (sc_use_light_projector && omni_lights.data[idx].projector_rect != vec4(0.0)) {
|
|
vec3 local_v = (omni_lights.data[idx].shadow_matrix * vec4(vertex, 1.0)).xyz;
|
|
local_v = normalize(local_v);
|
|
|
|
vec4 atlas_rect = omni_lights.data[idx].projector_rect;
|
|
|
|
if (local_v.z >= 0.0) {
|
|
atlas_rect.y += atlas_rect.w;
|
|
}
|
|
|
|
local_v.z = 1.0 + abs(local_v.z);
|
|
|
|
local_v.xy /= local_v.z;
|
|
local_v.xy = local_v.xy * 0.5 + 0.5;
|
|
vec2 proj_uv = local_v.xy * atlas_rect.zw;
|
|
|
|
if (sc_projector_use_mipmaps) {
|
|
vec2 proj_uv_ddx;
|
|
vec2 proj_uv_ddy;
|
|
{
|
|
vec3 local_v_ddx = (omni_lights.data[idx].shadow_matrix * vec4(vertex + vertex_ddx, 1.0)).xyz;
|
|
local_v_ddx = normalize(local_v_ddx);
|
|
|
|
if (local_v_ddx.z >= 0.0) {
|
|
local_v_ddx.z += 1.0;
|
|
} else {
|
|
local_v_ddx.z = 1.0 - local_v_ddx.z;
|
|
}
|
|
|
|
local_v_ddx.xy /= local_v_ddx.z;
|
|
local_v_ddx.xy = local_v_ddx.xy * 0.5 + 0.5;
|
|
|
|
proj_uv_ddx = local_v_ddx.xy * atlas_rect.zw - proj_uv;
|
|
|
|
vec3 local_v_ddy = (omni_lights.data[idx].shadow_matrix * vec4(vertex + vertex_ddy, 1.0)).xyz;
|
|
local_v_ddy = normalize(local_v_ddy);
|
|
|
|
if (local_v_ddy.z >= 0.0) {
|
|
local_v_ddy.z += 1.0;
|
|
} else {
|
|
local_v_ddy.z = 1.0 - local_v_ddy.z;
|
|
}
|
|
|
|
local_v_ddy.xy /= local_v_ddy.z;
|
|
local_v_ddy.xy = local_v_ddy.xy * 0.5 + 0.5;
|
|
|
|
proj_uv_ddy = local_v_ddy.xy * atlas_rect.zw - proj_uv;
|
|
}
|
|
|
|
vec4 proj = textureGrad(sampler2D(decal_atlas_srgb, light_projector_sampler), proj_uv + atlas_rect.xy, proj_uv_ddx, proj_uv_ddy);
|
|
color *= proj.rgb * proj.a;
|
|
} else {
|
|
vec4 proj = textureLod(sampler2D(decal_atlas_srgb, light_projector_sampler), proj_uv + atlas_rect.xy, 0.0);
|
|
color *= proj.rgb * proj.a;
|
|
}
|
|
}
|
|
|
|
light_attenuation *= shadow;
|
|
|
|
light_compute(normal, normalize(light_rel_vec), eye_vec, size_A, color, light_attenuation, f0, orms, omni_lights.data[idx].specular_amount,
|
|
#ifdef LIGHT_BACKLIGHT_USED
|
|
backlight,
|
|
#endif
|
|
#ifdef LIGHT_TRANSMITTANCE_USED
|
|
transmittance_color,
|
|
transmittance_depth,
|
|
transmittance_boost,
|
|
transmittance_z,
|
|
#endif
|
|
#ifdef LIGHT_RIM_USED
|
|
rim * omni_attenuation, rim_tint, rim_color,
|
|
#endif
|
|
#ifdef LIGHT_CLEARCOAT_USED
|
|
clearcoat, clearcoat_gloss,
|
|
#endif
|
|
#ifdef LIGHT_ANISOTROPY_USED
|
|
binormal, tangent, anisotropy,
|
|
#endif
|
|
#ifdef USE_SHADOW_TO_OPACITY
|
|
alpha,
|
|
#endif
|
|
diffuse_light,
|
|
specular_light);
|
|
}
|
|
|
|
float light_process_spot_shadow(uint idx, vec3 vertex, vec3 normal) {
|
|
#ifndef SHADOWS_DISABLED
|
|
if (spot_lights.data[idx].shadow_enabled) {
|
|
vec3 light_rel_vec = spot_lights.data[idx].position - vertex;
|
|
float light_length = length(light_rel_vec);
|
|
vec3 spot_dir = spot_lights.data[idx].direction;
|
|
|
|
vec3 shadow_dir = light_rel_vec / light_length;
|
|
vec3 normal_bias = normal * light_length * spot_lights.data[idx].shadow_normal_bias * (1.0 - abs(dot(normal, shadow_dir)));
|
|
|
|
//there is a shadowmap
|
|
vec4 v = vec4(vertex + normal_bias, 1.0);
|
|
|
|
vec4 splane = (spot_lights.data[idx].shadow_matrix * v);
|
|
splane.z -= spot_lights.data[idx].shadow_bias / (light_length * spot_lights.data[idx].inv_radius);
|
|
splane /= splane.w;
|
|
|
|
float shadow;
|
|
if (sc_use_light_soft_shadows && spot_lights.data[idx].soft_shadow_size > 0.0) {
|
|
//soft shadow
|
|
|
|
//find blocker
|
|
float z_norm = dot(spot_dir, -light_rel_vec) * spot_lights.data[idx].inv_radius;
|
|
|
|
vec2 shadow_uv = splane.xy * spot_lights.data[idx].atlas_rect.zw + spot_lights.data[idx].atlas_rect.xy;
|
|
|
|
float blocker_count = 0.0;
|
|
float blocker_average = 0.0;
|
|
|
|
mat2 disk_rotation;
|
|
{
|
|
float r = quick_hash(gl_FragCoord.xy) * 2.0 * M_PI;
|
|
float sr = sin(r);
|
|
float cr = cos(r);
|
|
disk_rotation = mat2(vec2(cr, -sr), vec2(sr, cr));
|
|
}
|
|
|
|
float uv_size = spot_lights.data[idx].soft_shadow_size * z_norm * spot_lights.data[idx].soft_shadow_scale;
|
|
vec2 clamp_max = spot_lights.data[idx].atlas_rect.xy + spot_lights.data[idx].atlas_rect.zw;
|
|
for (uint i = 0; i < sc_penumbra_shadow_samples; i++) {
|
|
vec2 suv = shadow_uv + (disk_rotation * scene_data.penumbra_shadow_kernel[i].xy) * uv_size;
|
|
suv = clamp(suv, spot_lights.data[idx].atlas_rect.xy, clamp_max);
|
|
float d = textureLod(sampler2D(shadow_atlas, material_samplers[SAMPLER_LINEAR_CLAMP]), suv, 0.0).r;
|
|
if (d < splane.z) {
|
|
blocker_average += d;
|
|
blocker_count += 1.0;
|
|
}
|
|
}
|
|
|
|
if (blocker_count > 0.0) {
|
|
//blockers found, do soft shadow
|
|
blocker_average /= blocker_count;
|
|
float penumbra = (z_norm - blocker_average) / blocker_average;
|
|
uv_size *= penumbra;
|
|
|
|
shadow = 0.0;
|
|
for (uint i = 0; i < sc_penumbra_shadow_samples; i++) {
|
|
vec2 suv = shadow_uv + (disk_rotation * scene_data.penumbra_shadow_kernel[i].xy) * uv_size;
|
|
suv = clamp(suv, spot_lights.data[idx].atlas_rect.xy, clamp_max);
|
|
shadow += textureProj(sampler2DShadow(shadow_atlas, shadow_sampler), vec4(suv, splane.z, 1.0));
|
|
}
|
|
|
|
shadow /= float(sc_penumbra_shadow_samples);
|
|
|
|
} else {
|
|
//no blockers found, so no shadow
|
|
shadow = 1.0;
|
|
}
|
|
} else {
|
|
//hard shadow
|
|
vec3 shadow_uv = vec3(splane.xy * spot_lights.data[idx].atlas_rect.zw + spot_lights.data[idx].atlas_rect.xy, splane.z);
|
|
shadow = sample_pcf_shadow(shadow_atlas, spot_lights.data[idx].soft_shadow_scale * scene_data.shadow_atlas_pixel_size, shadow_uv);
|
|
}
|
|
|
|
return shadow;
|
|
}
|
|
|
|
#endif // SHADOWS_DISABLED
|
|
|
|
return 1.0;
|
|
}
|
|
|
|
vec2 normal_to_panorama(vec3 n) {
|
|
n = normalize(n);
|
|
vec2 panorama_coords = vec2(atan(n.x, n.z), acos(-n.y));
|
|
|
|
if (panorama_coords.x < 0.0) {
|
|
panorama_coords.x += M_PI * 2.0;
|
|
}
|
|
|
|
panorama_coords /= vec2(M_PI * 2.0, M_PI);
|
|
return panorama_coords;
|
|
}
|
|
|
|
void light_process_spot(uint idx, vec3 vertex, vec3 eye_vec, vec3 normal, vec3 vertex_ddx, vec3 vertex_ddy, vec3 f0, uint orms, float shadow,
|
|
#ifdef LIGHT_BACKLIGHT_USED
|
|
vec3 backlight,
|
|
#endif
|
|
#ifdef LIGHT_TRANSMITTANCE_USED
|
|
vec4 transmittance_color,
|
|
float transmittance_depth,
|
|
float transmittance_boost,
|
|
#endif
|
|
#ifdef LIGHT_RIM_USED
|
|
float rim, float rim_tint, vec3 rim_color,
|
|
#endif
|
|
#ifdef LIGHT_CLEARCOAT_USED
|
|
float clearcoat, float clearcoat_gloss,
|
|
#endif
|
|
#ifdef LIGHT_ANISOTROPY_USED
|
|
vec3 binormal, vec3 tangent, float anisotropy,
|
|
#endif
|
|
#ifdef USE_SHADOW_TO_OPACITY
|
|
inout float alpha,
|
|
#endif
|
|
inout vec3 diffuse_light,
|
|
inout vec3 specular_light) {
|
|
vec3 light_rel_vec = spot_lights.data[idx].position - vertex;
|
|
float light_length = length(light_rel_vec);
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float spot_attenuation = get_omni_attenuation(light_length, spot_lights.data[idx].inv_radius, spot_lights.data[idx].attenuation);
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vec3 spot_dir = spot_lights.data[idx].direction;
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float scos = max(dot(-normalize(light_rel_vec), spot_dir), spot_lights.data[idx].cone_angle);
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float spot_rim = max(0.0001, (1.0 - scos) / (1.0 - spot_lights.data[idx].cone_angle));
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spot_attenuation *= 1.0 - pow(spot_rim, spot_lights.data[idx].cone_attenuation);
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float light_attenuation = spot_attenuation;
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vec3 color = spot_lights.data[idx].color;
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float specular_amount = spot_lights.data[idx].specular_amount;
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|
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float size_A = 0.0;
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|
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if (sc_use_light_soft_shadows && spot_lights.data[idx].size > 0.0) {
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float t = spot_lights.data[idx].size / max(0.001, light_length);
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size_A = max(0.0, 1.0 - 1 / sqrt(1 + t * t));
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}
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|
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#ifdef LIGHT_TRANSMITTANCE_USED
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float transmittance_z = transmittance_depth;
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transmittance_color.a *= light_attenuation;
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{
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vec4 splane = (spot_lights.data[idx].shadow_matrix * vec4(vertex - normalize(normal_interp) * spot_lights.data[idx].transmittance_bias, 1.0));
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splane /= splane.w;
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splane.xy = splane.xy * spot_lights.data[idx].atlas_rect.zw + spot_lights.data[idx].atlas_rect.xy;
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|
|
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float shadow_z = textureLod(sampler2D(shadow_atlas, material_samplers[SAMPLER_LINEAR_CLAMP]), splane.xy, 0.0).r;
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|
|
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shadow_z = shadow_z * 2.0 - 1.0;
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float z_far = 1.0 / spot_lights.data[idx].inv_radius;
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float z_near = 0.01;
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shadow_z = 2.0 * z_near * z_far / (z_far + z_near - shadow_z * (z_far - z_near));
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|
|
|
//distance to light plane
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float z = dot(spot_dir, -light_rel_vec);
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transmittance_z = z - shadow_z;
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|
}
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|
#endif //LIGHT_TRANSMITTANCE_USED
|
|
|
|
if (sc_use_light_projector && spot_lights.data[idx].projector_rect != vec4(0.0)) {
|
|
vec4 splane = (spot_lights.data[idx].shadow_matrix * vec4(vertex, 1.0));
|
|
splane /= splane.w;
|
|
|
|
vec2 proj_uv = normal_to_panorama(splane.xyz) * spot_lights.data[idx].projector_rect.zw;
|
|
|
|
if (sc_projector_use_mipmaps) {
|
|
//ensure we have proper mipmaps
|
|
vec4 splane_ddx = (spot_lights.data[idx].shadow_matrix * vec4(vertex + vertex_ddx, 1.0));
|
|
splane_ddx /= splane_ddx.w;
|
|
vec2 proj_uv_ddx = normal_to_panorama(splane_ddx.xyz) * spot_lights.data[idx].projector_rect.zw - proj_uv;
|
|
|
|
vec4 splane_ddy = (spot_lights.data[idx].shadow_matrix * vec4(vertex + vertex_ddy, 1.0));
|
|
splane_ddy /= splane_ddy.w;
|
|
vec2 proj_uv_ddy = normal_to_panorama(splane_ddy.xyz) * spot_lights.data[idx].projector_rect.zw - proj_uv;
|
|
|
|
vec4 proj = textureGrad(sampler2D(decal_atlas_srgb, light_projector_sampler), proj_uv + spot_lights.data[idx].projector_rect.xy, proj_uv_ddx, proj_uv_ddy);
|
|
color *= proj.rgb * proj.a;
|
|
} else {
|
|
vec4 proj = textureLod(sampler2D(decal_atlas_srgb, light_projector_sampler), proj_uv + spot_lights.data[idx].projector_rect.xy, 0.0);
|
|
color *= proj.rgb * proj.a;
|
|
}
|
|
}
|
|
light_attenuation *= shadow;
|
|
|
|
light_compute(normal, normalize(light_rel_vec), eye_vec, size_A, color, light_attenuation, f0, orms, spot_lights.data[idx].specular_amount,
|
|
#ifdef LIGHT_BACKLIGHT_USED
|
|
backlight,
|
|
#endif
|
|
#ifdef LIGHT_TRANSMITTANCE_USED
|
|
transmittance_color,
|
|
transmittance_depth,
|
|
transmittance_boost,
|
|
transmittance_z,
|
|
#endif
|
|
#ifdef LIGHT_RIM_USED
|
|
rim * spot_attenuation, rim_tint, rim_color,
|
|
#endif
|
|
#ifdef LIGHT_CLEARCOAT_USED
|
|
clearcoat, clearcoat_gloss,
|
|
#endif
|
|
#ifdef LIGHT_ANISOTROPY_USED
|
|
binormal, tangent, anisotropy,
|
|
#endif
|
|
#ifdef USE_SHADOW_TO_OPACITY
|
|
alpha,
|
|
#endif
|
|
diffuse_light, specular_light);
|
|
}
|
|
|
|
void reflection_process(uint ref_index, vec3 vertex, vec3 normal, float roughness, vec3 ambient_light, vec3 specular_light, inout vec4 ambient_accum, inout vec4 reflection_accum) {
|
|
vec3 box_extents = reflections.data[ref_index].box_extents;
|
|
vec3 local_pos = (reflections.data[ref_index].local_matrix * vec4(vertex, 1.0)).xyz;
|
|
|
|
if (any(greaterThan(abs(local_pos), box_extents))) { //out of the reflection box
|
|
return;
|
|
}
|
|
|
|
vec3 ref_vec = normalize(reflect(vertex, normal));
|
|
|
|
vec3 inner_pos = abs(local_pos / box_extents);
|
|
float blend = max(inner_pos.x, max(inner_pos.y, inner_pos.z));
|
|
//make blend more rounded
|
|
blend = mix(length(inner_pos), blend, blend);
|
|
blend *= blend;
|
|
blend = max(0.0, 1.0 - blend);
|
|
|
|
if (reflections.data[ref_index].intensity > 0.0) { // compute reflection
|
|
|
|
vec3 local_ref_vec = (reflections.data[ref_index].local_matrix * vec4(ref_vec, 0.0)).xyz;
|
|
|
|
if (reflections.data[ref_index].box_project) { //box project
|
|
|
|
vec3 nrdir = normalize(local_ref_vec);
|
|
vec3 rbmax = (box_extents - local_pos) / nrdir;
|
|
vec3 rbmin = (-box_extents - local_pos) / nrdir;
|
|
|
|
vec3 rbminmax = mix(rbmin, rbmax, greaterThan(nrdir, vec3(0.0, 0.0, 0.0)));
|
|
|
|
float fa = min(min(rbminmax.x, rbminmax.y), rbminmax.z);
|
|
vec3 posonbox = local_pos + nrdir * fa;
|
|
local_ref_vec = posonbox - reflections.data[ref_index].box_offset;
|
|
}
|
|
|
|
vec4 reflection;
|
|
|
|
reflection.rgb = textureLod(samplerCubeArray(reflection_atlas, material_samplers[SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP]), vec4(local_ref_vec, reflections.data[ref_index].index), roughness * MAX_ROUGHNESS_LOD).rgb * sc_luminance_multiplier;
|
|
|
|
if (reflections.data[ref_index].exterior) {
|
|
reflection.rgb = mix(specular_light, reflection.rgb, blend);
|
|
}
|
|
|
|
reflection.rgb *= reflections.data[ref_index].intensity; //intensity
|
|
reflection.a = blend;
|
|
reflection.rgb *= reflection.a;
|
|
|
|
reflection_accum += reflection;
|
|
}
|
|
|
|
switch (reflections.data[ref_index].ambient_mode) {
|
|
case REFLECTION_AMBIENT_DISABLED: {
|
|
//do nothing
|
|
} break;
|
|
case REFLECTION_AMBIENT_ENVIRONMENT: {
|
|
//do nothing
|
|
vec3 local_amb_vec = (reflections.data[ref_index].local_matrix * vec4(normal, 0.0)).xyz;
|
|
|
|
vec4 ambient_out;
|
|
|
|
ambient_out.rgb = textureLod(samplerCubeArray(reflection_atlas, material_samplers[SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP]), vec4(local_amb_vec, reflections.data[ref_index].index), MAX_ROUGHNESS_LOD).rgb;
|
|
ambient_out.a = blend;
|
|
if (reflections.data[ref_index].exterior) {
|
|
ambient_out.rgb = mix(ambient_light, ambient_out.rgb, blend);
|
|
}
|
|
|
|
ambient_out.rgb *= ambient_out.a;
|
|
ambient_accum += ambient_out;
|
|
} break;
|
|
case REFLECTION_AMBIENT_COLOR: {
|
|
vec4 ambient_out;
|
|
ambient_out.a = blend;
|
|
ambient_out.rgb = reflections.data[ref_index].ambient;
|
|
if (reflections.data[ref_index].exterior) {
|
|
ambient_out.rgb = mix(ambient_light, ambient_out.rgb, blend);
|
|
}
|
|
ambient_out.rgb *= ambient_out.a;
|
|
ambient_accum += ambient_out;
|
|
} break;
|
|
}
|
|
}
|
|
|
|
float blur_shadow(float shadow) {
|
|
return shadow;
|
|
#if 0
|
|
//disabling for now, will investigate later
|
|
float interp_shadow = shadow;
|
|
if (gl_HelperInvocation) {
|
|
interp_shadow = -4.0; // technically anything below -4 will do but just to make sure
|
|
}
|
|
|
|
uvec2 fc2 = uvec2(gl_FragCoord.xy);
|
|
interp_shadow -= dFdx(interp_shadow) * (float(fc2.x & 1) - 0.5);
|
|
interp_shadow -= dFdy(interp_shadow) * (float(fc2.y & 1) - 0.5);
|
|
|
|
if (interp_shadow >= 0.0) {
|
|
shadow = interp_shadow;
|
|
}
|
|
return shadow;
|
|
#endif
|
|
}
|