Index: source/renderer/Renderer.cpp
===================================================================
--- source/renderer/Renderer.cpp
+++ source/renderer/Renderer.cpp
@@ -644,6 +644,7 @@
 	m->postprocManager.Resize();
 
 	m_WaterManager->Resize();
+	m->terrainRenderer.Resize();
 }
 
 //////////////////////////////////////////////////////////////////////////////////////////
Index: source/renderer/TerrainRenderer.h
===================================================================
--- source/renderer/TerrainRenderer.h
+++ source/renderer/TerrainRenderer.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2012 Wildfire Games.
+/* Copyright (C) 2019 Wildfire Games.
  * This file is part of 0 A.D.
  *
  * 0 A.D. is free software: you can redistribute it and/or modify
@@ -144,6 +144,11 @@
 	 */
 	void RenderTerrainOverlayTexture(int cullGroup, CMatrix3D& textureMatrix);
 
+	/**
+	* Remebers that screen width, height changed and needs to send new data
+	* to shader in next draw call
+	*/
+	void Resize();
 private:
 	TerrainRendererInternals* m;
 
Index: source/renderer/TerrainRenderer.cpp
===================================================================
--- source/renderer/TerrainRenderer.cpp
+++ source/renderer/TerrainRenderer.cpp
@@ -88,6 +88,8 @@
 	CShaderProgramPtr fancyWaterShader;
 
 	CSimulation2* simulation;
+
+	bool resized;
 };
 
 
@@ -572,6 +574,11 @@
 #endif
 }
 
+// Remember that screen changed size
+void TerrainRenderer::Resize()
+{
+	m->resized = true;
+}
 
 ///////////////////////////////////////////////////////////////////
 // Scissor rectangle of water patches
@@ -662,6 +669,7 @@
 			return false;
 		}
 		WaterMgr->m_NeedsReloading = false;
+		m->resized = true;
 	}
 
 	CLOSTexture& losTexture = g_Renderer.GetScene().GetLOSTexture();
@@ -780,6 +788,10 @@
 		if (WaterMgr->m_WaterReflection)
 			m->fancyWaterShader->Uniform(str_reflectionMatrix, WaterMgr->m_ReflectionMatrix);
 	}
+
+	if (m->resized)
+		m->fancyWaterShader->Uniform(str_screenSize, (float)g_Renderer.GetWidth(), (float)g_Renderer.GetHeight(), 0.0f, 0.0f);
+
 	m->fancyWaterShader->Uniform(str_sunDir, lightEnv.GetSunDir());
 	m->fancyWaterShader->Uniform(str_sunColor, lightEnv.m_SunColor);
 	m->fancyWaterShader->Uniform(str_color, WaterMgr->m_WaterColor);
@@ -793,7 +805,6 @@
 	m->fancyWaterShader->Uniform(str_fogColor, lightEnv.m_FogColor);
 	m->fancyWaterShader->Uniform(str_fogParams, lightEnv.m_FogFactor, lightEnv.m_FogMax, 0.f, 0.f);
 	m->fancyWaterShader->Uniform(str_time, (float)time);
-	m->fancyWaterShader->Uniform(str_screenSize, (float)g_Renderer.GetWidth(), (float)g_Renderer.GetHeight(), 0.0f, 0.0f);
 
 	if (WaterMgr->m_WaterType == L"clap")
 	{
@@ -831,6 +842,7 @@
 	glDepthFunc(GL_LEQUAL);
 	glDisable(GL_BLEND);
 
+	m->resized = false;
 	return true;
 }