From 172beac34e82c86f8c16b8a1be5fca9d7ccfc0d1 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 18 Aug 2024 16:14:29 +0100
Subject: Update asset stencils from shadow mapper

---
 gfx/gl/shadowMapper.cpp     |  9 +++++++++
 gfx/gl/shadowStenciller.cpp | 15 +++++++--------
 gfx/gl/shadowStenciller.h   |  3 ++-
 3 files changed, 18 insertions(+), 9 deletions(-)

(limited to 'gfx/gl')

diff --git a/gfx/gl/shadowMapper.cpp b/gfx/gl/shadowMapper.cpp
index a846a3d..9b9e404 100644
--- a/gfx/gl/shadowMapper.cpp
+++ b/gfx/gl/shadowMapper.cpp
@@ -1,6 +1,7 @@
 #include "shadowMapper.h"
 #include "camera.h"
 #include "collections.h"
+#include "game/gamestate.h"
 #include "gfx/gl/shaders/fs-shadowDynamicPointInstWithTextures.h"
 #include "gfx/gl/shaders/gs-commonShadowPoint.h"
 #include "gfx/gl/shaders/gs-shadowDynamicPointInstWithTextures.h"
@@ -8,6 +9,8 @@
 #include "gfx/gl/shaders/vs-shadowDynamicPointInst.h"
 #include "gfx/gl/shaders/vs-shadowDynamicPointInstWithTextures.h"
 #include "gfx/gl/shaders/vs-shadowLandmass.h"
+#include "gfx/gl/shadowStenciller.h"
+#include "gfx/renderable.h"
 #include "gl_traits.h"
 #include "location.h"
 #include "maths.h"
@@ -74,6 +77,12 @@ ShadowMapper::getBandViewExtents(const Camera & camera, const glm::mat4 & lightV
 ShadowMapper::Definitions
 ShadowMapper::update(const SceneProvider & scene, const Direction3D & dir, const Camera & camera) const
 {
+	ShadowStenciller shadowStenciller {dir, up};
+	for (const auto & [id, asset] : gameState->assets) {
+		if (const auto r = std::dynamic_pointer_cast<const Renderable>(asset)) {
+			r->updateStencil(shadowStenciller);
+		}
+	}
 	glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
 	glClear(GL_DEPTH_BUFFER_BIT);
 	glCullFace(GL_FRONT);
diff --git a/gfx/gl/shadowStenciller.cpp b/gfx/gl/shadowStenciller.cpp
index dc87d76..9f13808 100644
--- a/gfx/gl/shadowStenciller.cpp
+++ b/gfx/gl/shadowStenciller.cpp
@@ -1,15 +1,14 @@
 #include "shadowStenciller.h"
-#include "config/types.h"
 #include "gfx/gl/program.h"
 #include "gfx/gl/shaders/fs-shadowStencil.h"
 #include "gfx/gl/shaders/vs-shadowStencil.h"
 #include "gfx/models/mesh.h"
 #include "glArrays.h"
 #include "gl_traits.h"
-#include "maths.h"
 #include <stdexcept>
 
-ShadowStenciller::ShadowStenciller() : shadowCaster {shadowStencil_vs, shadowStencil_fs}
+ShadowStenciller::ShadowStenciller(const Direction3D & lightDir, const Direction3D & lightDirUp) :
+	shadowCaster {shadowStencil_vs, shadowStencil_fs}, lightDirMat {glm::lookAt(-lightDir, {}, lightDirUp)}
 {
 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 	glDrawBuffer(GL_NONE);
@@ -47,10 +46,10 @@ ShadowStenciller::renderStencil(const glTexture & stencil, const MeshBase & mesh
 	glClear(GL_DEPTH_BUFFER_BIT);
 	glViewport(0, 0, 256, 256);
 	glEnable(GL_DEPTH_TEST);
-	const auto & mins = mesh.getDimensions().minExtent;
-	const auto & maxs = mesh.getDimensions().maxExtent;
-	const auto extents = glm::ortho(mins.x, maxs.x, mins.z, maxs.z, mins.y, maxs.y);
-	const auto lightDir = glm::lookAt({}, north, up);
-	glUniform(viewProjectionLoc, extents * lightDir);
+	const auto & centre = mesh.getDimensions().centre;
+	const auto & size = mesh.getDimensions().size;
+	const auto extentsMat
+			= glm::translate(glm::ortho(-size, size, -size, size, -size, size), {-centre.x, -centre.z, -centre.y});
+	glUniform(viewProjectionLoc, extentsMat * lightDirMat);
 	mesh.Draw();
 }
diff --git a/gfx/gl/shadowStenciller.h b/gfx/gl/shadowStenciller.h
index bf6d204..87dc044 100644
--- a/gfx/gl/shadowStenciller.h
+++ b/gfx/gl/shadowStenciller.h
@@ -7,7 +7,7 @@
 
 class ShadowStenciller {
 public:
-	ShadowStenciller();
+	ShadowStenciller(const Direction3D & lightDir, const Direction3D & lightDirUp);
 
 	[[nodiscard]]
 	static glTexture createStencilTexture(GLsizei width, GLsizei height);
@@ -16,5 +16,6 @@ public:
 private:
 	glFrameBuffer fbo;
 	Program shadowCaster;
+	glm::mat4 lightDirMat;
 	Program::UniformLocation viewProjectionLoc {shadowCaster, "viewProjection"};
 };
-- 
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