From 737ce277a6e49d88a04be1e384eef09d486f513b Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 6 Apr 2024 00:47:37 +0100
Subject: Split water from terrain

Shares the geo data instance, and still has the same implementation at this stage.
---
 game/water.cpp | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 game/water.cpp

(limited to 'game/water.cpp')

diff --git a/game/water.cpp b/game/water.cpp
new file mode 100644
index 0000000..1c0e9ca
--- /dev/null
+++ b/game/water.cpp
@@ -0,0 +1,59 @@
+#include "water.h"
+#include "game/geoData.h"
+#include "gfx/models/texture.h"
+#include <algorithm>
+#include <cstddef>
+#include <gfx/gl/sceneShader.h>
+#include <gfx/gl/shadowMapper.h>
+#include <gfx/image.h>
+#include <gfx/models/mesh.h>
+#include <gfx/models/vertex.h>
+#include <glm/glm.hpp>
+#include <iterator>
+#include <location.h>
+#include <maths.h>
+#include <utility>
+#include <vector>
+
+Water::Water(std::shared_ptr<GeoData> tm) : geoData {std::move(tm)}, water {std::make_shared<Texture>("water.png")}
+{
+	generateMeshes();
+}
+
+void
+Water::generateMeshes()
+{
+	std::vector<unsigned int> indices;
+	indices.reserve(geoData->n_faces() * 3);
+	std::vector<Vertex> vertices;
+	vertices.reserve(geoData->n_vertices());
+	std::map<GeoData::VertexHandle, size_t> vertexIndex;
+	std::transform(geoData->vertices_sbegin(), geoData->vertices_end(), std::back_inserter(vertices),
+			[this, &vertexIndex](const GeoData::VertexHandle v) {
+				vertexIndex.emplace(v, vertexIndex.size());
+				const auto p = geoData->point(v);
+				return Vertex {p, RelativePosition2D(p) / 10000.F, geoData->normal(v)};
+			});
+	std::for_each(
+			geoData->faces_sbegin(), geoData->faces_end(), [this, &vertexIndex, &indices](const GeoData::FaceHandle f) {
+				std::transform(geoData->fv_begin(f), geoData->fv_end(f), std::back_inserter(indices),
+						[&vertexIndex](const GeoData::VertexHandle v) {
+							return vertexIndex[v];
+						});
+			});
+	meshes.create<Mesh>(vertices, indices);
+}
+
+void
+Water::tick(TickDuration dur)
+{
+	waveCycle += dur.count();
+}
+
+void
+Water::render(const SceneShader & shader) const
+{
+	shader.water.use(waveCycle);
+	water->bind();
+	meshes.apply(&Mesh::Draw);
+}
-- 
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