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Shading: Add Map Range node to Cycles and EEVEE.

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This patch adds a new Map Range node that linearly remaps an input
value from a range to another. This node is similar to the compositor's
Map Range node.

Reviewers: brecht, JacquesLucke

Differential Revision: https://developer.blender.org/D5471
This commit is contained in:
OmarSquircleArt
2019-08-13 16:29:32 +02:00
parent aef08fda3a
commit 71641ab56d
17 changed files with 244 additions and 0 deletions
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69
intern/cycles/render/nodes.cpp
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@@ -5259,6 +5259,75 @@ void OutputNode::compile(OSLCompiler &compiler)
compiler.add(this, "node_output_displacement");
}
/* Map Range Node */
NODE_DEFINE(MapRangeNode)
{
NodeType *type = NodeType::add("map_range", create, NodeType::SHADER);
SOCKET_IN_FLOAT(value, "Value", 1.0f);
SOCKET_IN_FLOAT(from_min, "From Min", 0.0f);
SOCKET_IN_FLOAT(from_max, "From Max", 1.0f);
SOCKET_IN_FLOAT(to_min, "To Min", 0.0f);
SOCKET_IN_FLOAT(to_max, "To Max", 1.0f);
SOCKET_OUT_FLOAT(result, "Result");
return type;
}
MapRangeNode::MapRangeNode() : ShaderNode(node_type)
{
}
void MapRangeNode::constant_fold(const ConstantFolder &folder)
{
if (folder.all_inputs_constant()) {
float result;
if (from_max != from_min) {
result = to_min + ((value - from_min) / (from_max - from_min)) * (to_max - to_min);
}
else {
result = 0.0f;
}
folder.make_constant(result);
}
}
void MapRangeNode::compile(SVMCompiler &compiler)
{
ShaderInput *value_in = input("Value");
ShaderInput *from_min_in = input("From Min");
ShaderInput *from_max_in = input("From Max");
ShaderInput *to_min_in = input("To Min");
ShaderInput *to_max_in = input("To Max");
ShaderOutput *result_out = output("Result");
int value_stack_offset = compiler.stack_assign(value_in);
int from_min_stack_offset = compiler.stack_assign_if_linked(from_min_in);
int from_max_stack_offset = compiler.stack_assign_if_linked(from_max_in);
int to_min_stack_offset = compiler.stack_assign_if_linked(to_min_in);
int to_max_stack_offset = compiler.stack_assign_if_linked(to_max_in);
int result_stack_offset = compiler.stack_assign(result_out);
compiler.add_node(
NODE_MAP_RANGE,
value_stack_offset,
compiler.encode_uchar4(
from_min_stack_offset, from_max_stack_offset, to_min_stack_offset, to_max_stack_offset),
result_stack_offset);
compiler.add_node(__float_as_int(from_min),
__float_as_int(from_max),
__float_as_int(to_min),
__float_as_int(to_max));
}
void MapRangeNode::compile(OSLCompiler &compiler)
{
compiler.add(this, "node_map_range");
}
/* Math */
NODE_DEFINE(MathNode)