From 194148abd9ab89a5a514a37b7717b7c4de6aa758 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 10 Mar 2025 02:12:16 +0000
Subject: Pass a Frustum to shadow renderers

The frustum might not be correct at this stage.
---
 gfx/aabb.h               | 2 +-
 gfx/gl/sceneProvider.cpp | 2 +-
 gfx/gl/sceneProvider.h   | 2 +-
 gfx/gl/shadowMapper.cpp  | 9 ++++++++-
 gfx/renderable.cpp       | 2 +-
 gfx/renderable.h         | 2 +-
 6 files changed, 13 insertions(+), 6 deletions(-)

(limited to 'gfx')

diff --git a/gfx/aabb.h b/gfx/aabb.h
index a661f66..ce15a0f 100644
--- a/gfx/aabb.h
+++ b/gfx/aabb.h
@@ -37,5 +37,5 @@ public:
 				}));
 	}
 
-	V min, max;
+	V min {}, max {};
 };
diff --git a/gfx/gl/sceneProvider.cpp b/gfx/gl/sceneProvider.cpp
index 4e271db..e01532e 100644
--- a/gfx/gl/sceneProvider.cpp
+++ b/gfx/gl/sceneProvider.cpp
@@ -9,6 +9,6 @@ SceneProvider::environment(const SceneShader &, const SceneRenderer & renderer)
 }
 
 void
-SceneProvider::shadows(const ShadowMapper &) const
+SceneProvider::shadows(const ShadowMapper &, const Frustum &) const
 {
 }
diff --git a/gfx/gl/sceneProvider.h b/gfx/gl/sceneProvider.h
index 93b384f..f6b7009 100644
--- a/gfx/gl/sceneProvider.h
+++ b/gfx/gl/sceneProvider.h
@@ -16,5 +16,5 @@ public:
 	virtual void content(const SceneShader &, const Frustum &) const = 0;
 	virtual void environment(const SceneShader &, const SceneRenderer &) const;
 	virtual void lights(const SceneShader &) const = 0;
-	virtual void shadows(const ShadowMapper &) const;
+	virtual void shadows(const ShadowMapper &, const Frustum &) const;
 };
diff --git a/gfx/gl/shadowMapper.cpp b/gfx/gl/shadowMapper.cpp
index 231f203..dc461e0 100644
--- a/gfx/gl/shadowMapper.cpp
+++ b/gfx/gl/shadowMapper.cpp
@@ -118,7 +118,14 @@ ShadowMapper::update(const SceneProvider & scene, const LightDirection & dir, co
 				 &landmess, &dynamicPoint, &dynamicPointInst, &dynamicPointInstWithTextures, &stencilShadowProgram}) {
 		p->setView(out, sizes, lightViewPoint);
 	}
-	scene.shadows(*this);
+	ExtentsBoundingBox extents;
+	for (const auto & point : bandViewExtents.back()) {
+		extents += point;
+	}
+	const auto lightProjection
+			= glm::ortho(extents.min.x, extents.max.x, extents.min.y, extents.max.y, -extents.max.z, -extents.min.z);
+	Frustum frustum {lightViewPoint, lightViewDir, lightProjection};
+	scene.shadows(*this, frustum);
 
 	glCullFace(GL_BACK);
 
diff --git a/gfx/renderable.cpp b/gfx/renderable.cpp
index 3594968..27f2459 100644
--- a/gfx/renderable.cpp
+++ b/gfx/renderable.cpp
@@ -6,7 +6,7 @@ Renderable::lights(const SceneShader &) const
 }
 
 void
-Renderable::shadows(const ShadowMapper &) const
+Renderable::shadows(const ShadowMapper &, const Frustum &) const
 {
 }
 
diff --git a/gfx/renderable.h b/gfx/renderable.h
index 9fbeccd..140c570 100644
--- a/gfx/renderable.h
+++ b/gfx/renderable.h
@@ -15,7 +15,7 @@ public:
 
 	virtual void render(const SceneShader & shader, const Frustum &) const = 0;
 	virtual void lights(const SceneShader & shader) const;
-	virtual void shadows(const ShadowMapper & shadowMapper) const;
+	virtual void shadows(const ShadowMapper & shadowMapper, const Frustum &) const;
 
 	virtual void updateStencil(const ShadowStenciller & lightDir) const;
 };
-- 
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