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| author | Clément Foucault <foucault.clem@gmail.com> | 2020-01-29 02:32:45 +0300 |
|---|---|---|
| committer | Clément Foucault <foucault.clem@gmail.com> | 2020-01-29 03:02:14 +0300 |
| commit | 3d73609832da4039ac0d4c4a3089ea180213fd1b (patch) | |
| tree | c1aef873a005d4865f601895a84714acab98725a /source/blender/draw/engines/eevee/shaders/ltc_lib.glsl | |
| parent | f9e1e088a4c7000158aa1e99d32a7785bc36e9e5 (diff) | |
Fix T67060 EEVEE: Noise caused by disk lights
This is an issue on some drivers that might output NaN out of sqrt if the
number is infinity.
Diffstat (limited to 'source/blender/draw/engines/eevee/shaders/ltc_lib.glsl')
| -rw-r--r-- | source/blender/draw/engines/eevee/shaders/ltc_lib.glsl | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/ltc_lib.glsl b/source/blender/draw/engines/eevee/shaders/ltc_lib.glsl index 2cf8501de9b..61d34e2afdc 100644 --- a/source/blender/draw/engines/eevee/shaders/ltc_lib.glsl +++ b/source/blender/draw/engines/eevee/shaders/ltc_lib.glsl @@ -54,6 +54,9 @@ vec3 solve_cubic(vec4 coefs) /* Discriminant */ float discr = dot(vec2(4.0 * delta.x, -delta.y), delta.zy); + /* Clamping avoid NaN output on some platform. (see T67060) */ + float sqrt_discr = sqrt(clamp(discr, 0.0, FLT_MAX)); + vec2 xlc, xsc; /* Algorithm A */ @@ -63,7 +66,7 @@ vec3 solve_cubic(vec4 coefs) float D_a = -2.0 * B * delta.x + delta.y; /* Take the cubic root of a normalized complex number */ - float theta = atan(sqrt(discr), -D_a) / 3.0; + float theta = atan(sqrt_discr, -D_a) / 3.0; float x_1a = 2.0 * sqrt(-C_a) * cos(theta); float x_3a = 2.0 * sqrt(-C_a) * cos(theta + (2.0 / 3.0) * M_PI); @@ -86,7 +89,7 @@ vec3 solve_cubic(vec4 coefs) float D_d = -D * delta.y + 2.0 * C * delta.z; /* Take the cubic root of a normalized complex number */ - float theta = atan(D * sqrt(discr), -D_d) / 3.0; + float theta = atan(D * sqrt_discr, -D_d) / 3.0; float x_1d = 2.0 * sqrt(-C_d) * cos(theta); float x_3d = 2.0 * sqrt(-C_d) * cos(theta + (2.0 / 3.0) * M_PI); |