From 10fd8bbea23fed2f7a0ea76f4b2f7802f7745095 Mon Sep 17 00:00:00 2001
From: LHoG <1476261+lhog@users.noreply.github.com>
Date: Sat, 13 Mar 2021 16:29:54 +0300
Subject: [PATCH] Fixed 625af772e5e0ce09eab9fdece959169893e97e9e

---
 rts/Game/UI/MiniMap.cpp | 23 +++++++++++++++++++++++
 rts/Game/UI/MiniMap.h   |  8 ++++++++
 2 files changed, 31 insertions(+)

diff --git a/rts/Game/UI/MiniMap.cpp b/rts/Game/UI/MiniMap.cpp
index fa9de56cf9..d7fc2571e4 100644
--- a/rts/Game/UI/MiniMap.cpp
+++ b/rts/Game/UI/MiniMap.cpp
@@ -393,6 +393,29 @@ void CMiniMap::UpdateGeometry()
 		curPos.x = Clamp(curPos.x, 0, globalRendering->viewSizeX - curDim.x);
 	}
 
+	{
+		// Draw{WorldStuff} transform
+		viewMats[0].LoadIdentity();
+		viewMats[0].Translate(UpVector);
+		viewMats[0].Scale({ +1.0f / (mapDims.mapx * SQUARE_SIZE), -1.0f / (mapDims.mapy * SQUARE_SIZE), 1.0f });
+		viewMats[0].RotateX(90.0f * math::DEG_TO_RAD); // rotate to match real 'world' coordinates
+		viewMats[0].Scale(XZVector + UpVector * 0.0001f); // (invertibly) flatten; LuaOpenGL::DrawScreen uses persp-proj so z-values influence x&y
+
+		viewMats[1].LoadIdentity();
+		viewMats[1].Translate(UpVector);
+		// heightmap (squares) to minimap
+		viewMats[1].Scale({ 1.0f / mapDims.mapx, -1.0f / mapDims.mapy, 1.0f });
+		// worldmap (elmos) to minimap
+		// viewMats[1].Scale({1.0f / (mapDims.mapx * SQUARE_SIZE), -1.0f / (mapDims.mapy * SQUARE_SIZE), 1.0f});
+
+		viewMats[2].LoadIdentity();
+		viewMats[2].Scale({ 1.0f / curDim.x, 1.0f / curDim.y, 1.0f });
+
+		projMats[0] = CMatrix44f::ClipOrthoProj01();
+		projMats[1] = CMatrix44f::ClipOrthoProj(0.0f, 1.0f, 0.0f, 1.0f, 0.0f, -1.0f, globalRendering->supportClipSpaceControl * 1.0f);
+		projMats[2] = projMats[1];
+	}
+
 	lastWindowSizeX = globalRendering->viewSizeX;
 	lastWindowSizeY = globalRendering->viewSizeY;
 
diff --git a/rts/Game/UI/MiniMap.h b/rts/Game/UI/MiniMap.h
index 61779ba437..a7aad702d3 100644
--- a/rts/Game/UI/MiniMap.h
+++ b/rts/Game/UI/MiniMap.h
@@ -7,6 +7,7 @@
 #include <deque>
 #include "InputReceiver.h"
 #include "Rendering/GL/FBO.h"
+#include "System/Matrix44f.h"
 #include "System/Color.h"
 #include "System/float3.h"
 #include "System/type2.h"
@@ -69,6 +70,9 @@ class CMiniMap : public CInputReceiver {
 	const unsigned char* GetAllyTeamIconColor() const { return &allyColor[0]; }
 	const unsigned char* GetEnemyTeamIconColor() const { return &enemyColor[0]; }
 
+	const CMatrix44f& GetViewMat(unsigned int idx) const { return viewMats[idx]; }
+	const CMatrix44f& GetProjMat(unsigned int idx) const { return projMats[idx]; }
+
 	void ApplyConstraintsMatrix() const;
 
 protected:
@@ -171,6 +175,10 @@ class CMiniMap : public CInputReceiver {
 	SColor allyColor;
 	SColor enemyColor;
 
+	// transforms for [0] := Draw, [1] := DrawInMiniMap, [2] := Lua DrawInMiniMap
+	CMatrix44f viewMats[3];
+	CMatrix44f projMats[3];
+
 	FBO fbo;
 	FBO fboResolve;
 	GLuint minimapTex = 0;