Fix T83494: Eevee clamp node incorrect when min > max.

In glsl the clamp function has undefined behavior when min > max. For
the clamp node this resulted in differences between cycles and eevee.
This patch adds the expected implementation for minmax.

The old clamp function is still used in cases where we know for certain
that the input values are correct (math node clamp option). GPU uses
optimized code and silicon in these cases.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl
index b196aed690f..f89608feff1 100644
--- a/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl
@@ -3,6 +3,11 @@ void clamp_value(float value, float min, float max, out float result)
   result = clamp(value, min, max);
 }
 
+void clamp_minmax(float value, float min_allowed, float max_allowed, out float result)
+{
+  result = min(max(value, min_allowed), max_allowed);
+}
+
 void clamp_range(float value, float min, float max, out float result)
 {
   result = (max > min) ? clamp(value, min, max) : clamp(value, max, min);