source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl

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);
}
GPU: Split gpu_shader_material into multiple files. This patch continue the efforts to split the `gpu_shader_material` file started in D5569. Dependency resolution is now recursive. Each shading node gets its own file. Additionally, some utility files are added to be shared between files, like `math_util`, `color_util`, and `hash`. Some files are always included because they may be used in the execution function, like `world_normals`. Some glsl functions appeared to be unused, so they were removed, like `output_node`, `bits_to_01`, and `exp_blender`. Other functions have been renamed to be more general and get used as utils, like `texco_norm` which became `vector_normalize`. A lot of the opengl tests fails, but those same tests also fail in master, so this is probably unrelated to this patch. Reviewers: brecht Differential Revision: https://developer.blender.org/D5616 2019-08-30 17:23:04 +02:00			`void clamp_value(float value, float min, float max, out float result)`
			`{`
			`result = clamp(value, min, max);`
			`}`
Shader Nodes: Add Interpolation modes to Map Range node Modes: Linear interpolation (default), stepped linear, smoothstep and smootherstep. This also includes an additional option for the Clamp node to switch between Min Max (default) and Range mode. This was needed to allow clamping when To Max is less than To Min. Reviewed By: JacquesLucke, brecht Differential Revision: https://developer.blender.org/D5827 2019-12-07 12:35:07 +00:00
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. 2020-12-18 10:26:02 +01:00			`void clamp_minmax(float value, float min_allowed, float max_allowed, out float result)`
			`{`
			`result = min(max(value, min_allowed), max_allowed);`
			`}`

Shader Nodes: Add Interpolation modes to Map Range node Modes: Linear interpolation (default), stepped linear, smoothstep and smootherstep. This also includes an additional option for the Clamp node to switch between Min Max (default) and Range mode. This was needed to allow clamping when To Max is less than To Min. Reviewed By: JacquesLucke, brecht Differential Revision: https://developer.blender.org/D5827 2019-12-07 12:35:07 +00:00			`void clamp_range(float value, float min, float max, out float result)`
			`{`
			`result = (max > min) ? clamp(value, min, max) : clamp(value, max, min);`
			`}`