From 8740d30b01f6c12e2fcea0450df73736cd17dc87 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 10 Jan 2024 01:10:44 +0000
Subject: Add spot light definition, loader, and rendering

Rendering is untested, data is passed to whatever GL program is currently active.
---
 game/scenary/illuminator.cpp | 27 ++++++++++++++++++++++++---
 game/scenary/illuminator.h   | 21 ++++++++++++++++++++-
 res/lights.xml               |  1 +
 test/test-assetFactory.cpp   |  1 +
 4 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/game/scenary/illuminator.cpp b/game/scenary/illuminator.cpp
index 4989933..43b6e4e 100644
--- a/game/scenary/illuminator.cpp
+++ b/game/scenary/illuminator.cpp
@@ -4,10 +4,18 @@
 #include "gfx/models/texture.h"
 #include "location.h"
 
+bool
+Illuminator::SpotLight::persist(Persistence::PersistenceStore & store)
+{
+	return STORE_TYPE && STORE_MEMBER(position) && STORE_MEMBER(direction) && STORE_MEMBER(colour) && STORE_MEMBER(kq)
+			&& STORE_MEMBER(arc);
+}
+
 bool
 Illuminator::persist(Persistence::PersistenceStore & store)
 {
-	return STORE_TYPE && STORE_HELPER(bodyMesh, Asset::MeshConstruct) && Asset::persist(store);
+	return STORE_TYPE && STORE_HELPER(bodyMesh, Asset::MeshConstruct)
+			&& STORE_HELPER(spotLight, Persistence::Appender<decltype(spotLight)>) && Asset::persist(store);
 }
 
 void
@@ -16,6 +24,14 @@ Illuminator::postLoad()
 	texture = getTexture();
 	bodyMesh->configureVAO(instanceVAO)
 			.addAttribs<LocationVertex, &LocationVertex::first, &LocationVertex::second>(instances.bufferName(), 1);
+	VertexArrayObject {instancesSpotLightVAO}
+			.addAttribs<LocationVertex, &LocationVertex::first, &LocationVertex::second>(instances.bufferName(), 0)
+			.addAttribs<SpotLightVertex, &SpotLightVertex::position, &SpotLightVertex::direction,
+					&SpotLightVertex::colour, &SpotLightVertex::kq, &SpotLightVertex::arc>(
+					instancesSpotLight.bufferName(), 1);
+	std::transform(spotLight.begin(), spotLight.end(), std::back_inserter(spotLightInstances), [this](const auto & s) {
+		return instancesSpotLight.acquire(*s);
+	});
 }
 
 void
@@ -34,7 +50,12 @@ void
 Illuminator::lights(const SceneShader &) const
 {
 	if (const auto count = instances.size()) {
-		// shader.pointLight.use();
-		// bodyMesh->DrawInstanced(instanceVAO, static_cast<GLsizei>(count));
+		if (const auto scount = instancesSpotLight.size()) {
+			// shader.pointLight.use();
+			glBindVertexArray(instancesSpotLightVAO);
+			glDrawArraysInstanced(GL_POINTS, 0, static_cast<GLsizei>(count), static_cast<GLsizei>(scount));
+		}
+
+		glBindVertexArray(0);
 	}
 }
diff --git a/game/scenary/illuminator.h b/game/scenary/illuminator.h
index db9acfb..99b87eb 100644
--- a/game/scenary/illuminator.h
+++ b/game/scenary/illuminator.h
@@ -11,11 +11,27 @@ class Texture;
 class Illuminator : public Asset, public Renderable, public StdTypeDefs<Illuminator> {
 	Mesh::Ptr bodyMesh;
 	std::shared_ptr<Texture> texture;
-	glVertexArray instanceVAO;
+	glVertexArray instanceVAO, instancesSpotLightVAO;
+
+public:
+	struct SpotLightVertex {
+		RelativePosition3D position;
+		Direction3D direction;
+		RGB colour;
+		RelativeDistance kq;
+		Angle arc;
+	};
+
+	struct SpotLight : Persistence::Persistable, SpotLightVertex, StdTypeDefs<SpotLight> {
+	private:
+		friend Persistence::SelectionPtrBase<std::shared_ptr<SpotLight>>;
+		bool persist(Persistence::PersistenceStore & store) override;
+	};
 
 public:
 	using LocationVertex = std::pair<glm::mat4, GlobalPosition3D>;
 	mutable InstanceVertices<LocationVertex> instances;
+	mutable InstanceVertices<SpotLightVertex> instancesSpotLight;
 	void render(const SceneShader &) const override;
 	void lights(const SceneShader &) const override;
 
@@ -23,4 +39,7 @@ protected:
 	friend Persistence::SelectionPtrBase<std::shared_ptr<Illuminator>>;
 	bool persist(Persistence::PersistenceStore & store) override;
 	void postLoad() override;
+
+	std::vector<SpotLight::Ptr> spotLight;
+	std::vector<InstanceVertices<SpotLightVertex>::InstanceProxy> spotLightInstances;
 };
diff --git a/res/lights.xml b/res/lights.xml
index 137137d..5c11fdf 100644
--- a/res/lights.xml
+++ b/res/lights.xml
@@ -6,6 +6,7 @@
       <use type="cylinder" scale="0.07,0.07,3" position="0,0,1" colour="lightslategray"/>
       <use type="cylinder" scale="0.05,0.05,1.5" position="0,0.1,4" rotation="1.5,0,0" colour="lightslategray"/>
     </bodyMesh>
+    <spotLight position="0,1.4,4.1" direction="0,0,-1" colour=".9,.9,.9" kq="8000" arc="1.5"/>
   </asset>
   <!-- yes I'm hacking some floor to light up as though its a bush -->
   <asset p.typeid="Foliage" id="floor" name="floor">
diff --git a/test/test-assetFactory.cpp b/test/test-assetFactory.cpp
index e7ba19c..91a5321 100644
--- a/test/test-assetFactory.cpp
+++ b/test/test-assetFactory.cpp
@@ -49,6 +49,7 @@ public:
 	lights(const SceneShader & shader) const override
 	{
 		shader.pointLight.add({-3, 1, 5}, {1, 1, 1}, .1F);
+		objects.apply(&Renderable::lights, shader);
 	}
 
 	void
-- 
cgit v1.2.3