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Differential D11428 Diff 37616 source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl

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source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl

Show First 20 Lines • Show All 158 Lines • ▼ Show 20 Linesvec3 ensure_valid_reflection(vec3 Ng, vec3 I, vec3 N)
float fac = 0.5 / a; float fac = 0.5 / a;
float N1_z2 = fac * (b + c), N2_z2 = fac * (-b + c); float N1_z2 = fac * (b + c), N2_z2 = fac * (-b + c);
bool valid1 = (N1_z2 > 1e-5) && (N1_z2 <= (1.0 + 1e-5)); bool valid1 = (N1_z2 > 1e-5) && (N1_z2 <= (1.0 + 1e-5));
bool valid2 = (N2_z2 > 1e-5) && (N2_z2 <= (1.0 + 1e-5)); bool valid2 = (N2_z2 > 1e-5) && (N2_z2 <= (1.0 + 1e-5));
vec2 N_new; vec2 N_new;
if (valid1 && valid2) { if (valid1 && valid2) {
/* If both are possible, do the expensive reflection-based check. */ /* If both are possible, do the expensive reflection-based check. */
vec2 N1 = vec2(sqrt(1.0 - N1_z2), sqrt(N1_z2)); vec2 N1 = vec2(safe_sqrt(1.0 - N1_z2), safe_sqrt(N1_z2));
vec2 N2 = vec2(sqrt(1.0 - N2_z2), sqrt(N2_z2)); vec2 N2 = vec2(safe_sqrt(1.0 - N2_z2), safe_sqrt(N2_z2));
float R1 = 2.0 * (N1.x * Ix + N1.y * Iz) * N1.y - Iz; float R1 = 2.0 * (N1.x * Ix + N1.y * Iz) * N1.y - Iz;
float R2 = 2.0 * (N2.x * Ix + N2.y * Iz) * N2.y - Iz; float R2 = 2.0 * (N2.x * Ix + N2.y * Iz) * N2.y - Iz;
valid1 = (R1 >= 1e-5); valid1 = (R1 >= 1e-5);
valid2 = (R2 >= 1e-5); valid2 = (R2 >= 1e-5);
if (valid1 && valid2) { if (valid1 && valid2) {
N_new = (R1 < R2) ? N1 : N2; N_new = (R1 < R2) ? N1 : N2;
} }
else { else {
N_new = (R1 > R2) ? N1 : N2; N_new = (R1 > R2) ? N1 : N2;
} }
} }
else if (valid1 || valid2) { else if (valid1 || valid2) {
float Nz2 = valid1 ? N1_z2 : N2_z2; float Nz2 = valid1 ? N1_z2 : N2_z2;
N_new = vec2(sqrt(1.0 - Nz2), sqrt(Nz2)); N_new = vec2(safe_sqrt(1.0 - Nz2), safe_sqrt(Nz2));
} }
else { else {
return Ng; return Ng;
} }
return N_new.x * X + N_new.y * Ng; return N_new.x * X + N_new.y * Ng;
} }
/* ----------- Cone angle Approximation --------- */ /* ----------- Cone angle Approximation --------- */
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