From 1a3fb9f5b3a78fcfc7f89305101a43890aa1de48 Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Wed, 11 Jun 2025 00:51:42 +0300
Subject: [PATCH] fix night shadows

---
 res/shaders/lib/shadows.glsl          | 7 +++++--
 src/graphics/render/WorldRenderer.cpp | 7 ++++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/res/shaders/lib/shadows.glsl b/res/shaders/lib/shadows.glsl
index aa1ca09b..6056427f 100644
--- a/res/shaders/lib/shadows.glsl
+++ b/res/shaders/lib/shadows.glsl
@@ -3,6 +3,7 @@
 
 uniform sampler2DShadow u_shadows[2];
 uniform mat4 u_shadowsMatrix[2];
+uniform float u_dayTime;
 
 uniform int u_shadowsRes;
 
@@ -22,7 +23,7 @@ float calc_shadow() {
         shadow = 0.0;
         
         // TODO: optimize
-        if (dot(a_realnormal, u_sunDir) < 0.0) {
+        if (dot(a_realnormal, u_sunDir) < 0.0 || true) {
             if (a_distance > 128) {
                 for (int y = -1; y <= 1; y++) {
                     for (int x = -1; x <= 1; x++) {
@@ -48,7 +49,9 @@ float calc_shadow() {
                 }
                 shadow /= 25;
             }
-            shadow = shadow * 0.5 + 0.5;
+            float s = abs(cos(u_dayTime * 3.141592 * 2.0));
+            s = pow(s, 0.7);
+            shadow = mix(0.5, shadow * 0.5 + 0.5, s);
         } else {
             shadow = 0.5;
         }
diff --git a/src/graphics/render/WorldRenderer.cpp b/src/graphics/render/WorldRenderer.cpp
index e9a0d4fe..dce8caec 100644
--- a/src/graphics/render/WorldRenderer.cpp
+++ b/src/graphics/render/WorldRenderer.cpp
@@ -370,7 +370,12 @@ void WorldRenderer::generateShadowsMap(
     shadowCamera.perspective = false;
     shadowCamera.setAspectRatio(1.0f);
 
-    float sunAngle = glm::radians(fmod(90.0f - worldInfo.daytime * 360.0f, 180.0f));
+    float t = worldInfo.daytime - 0.25f;
+    if (t < 0.0f) {
+        t += 1.0f;
+    }
+    t = fmod(t, 0.5f);
+    float sunAngle = glm::radians(90.0f - (t + 0.25f) * 360.0f);
     shadowCamera.rotate(
         sunAngle,
         glm::radians(-45.0f),