From 7d0decccaac3aa564b549d91a36279e7aca0814e Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Fri, 24 Feb 2023 19:30:30 +0000
Subject: Support for recursive colouring of asset factory faces

Updates colours in sample model.
---
 assetFactory/style.cpp | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 assetFactory/style.cpp

(limited to 'assetFactory/style.cpp')

diff --git a/assetFactory/style.cpp b/assetFactory/style.cpp
new file mode 100644
index 0000000..099d81a
--- /dev/null
+++ b/assetFactory/style.cpp
@@ -0,0 +1,59 @@
+#include "style.h"
+
+ModelFactoryMesh::Color
+Style::parseColour(const std::string_view & in)
+{
+	if (in.empty()) {
+		return {};
+	}
+	if (in[0] == '#') {
+		ModelFactoryMesh::Color out {0, 0, 0, 1};
+		std::generate_n(out.begin(), (in.length() - 1) / 2, [in = in.data() + 1]() mutable {
+			uint8_t channel;
+			std::from_chars(in, in + 2, channel, 16);
+			in += 2;
+			return static_cast<float>(channel) / 256.F;
+		});
+		return out;
+	}
+	return {};
+}
+
+void
+Style::applyStyle(ModelFactoryMesh & mesh, const StyleStack & parents, const Shape::CreatedFaces & faces) const
+{
+	if (const auto effectiveColour = getProperty(parents, &Style::colour); !effectiveColour.empty()) {
+		const auto parsedColour = parseColour(effectiveColour);
+		for (const auto & face : faces) {
+			mesh.set_color(face.second, parsedColour);
+		}
+	}
+}
+
+void
+Style::applyStyle(ModelFactoryMesh & mesh, const StyleStack & parents, const ModelFactoryMesh::FaceHandle & face) const
+{
+	if (const auto effectiveColour = getProperty(parents, &Style::colour); !effectiveColour.empty()) {
+		const auto parsedColour = parseColour(effectiveColour);
+		mesh.set_color(face, parsedColour);
+	}
+}
+
+std::string_view
+Style::getProperty(const StyleStack & parents, std::string Style::*member)
+{
+	if (const auto itr = std::find_if(parents.rbegin(), parents.rend(),
+				[&member](auto && s) {
+					return !(s->*member).empty();
+				});
+			itr != parents.rend()) {
+		return (*itr)->*member;
+	}
+	return {};
+}
+
+bool
+Style::persist(Persistence::PersistenceStore & store)
+{
+	return STORE_MEMBER(colour);
+}
-- 
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