From cd17687f01420952712a500107e0f93e7ab8d5f8 Mon Sep 17 00:00:00 2001
From: Jacek Antonelli
Date: Fri, 15 Aug 2008 23:45:34 -0500
Subject: Second Life viewer sources 1.19.1.0

---
 linden/indra/newview/llvowlsky.h | 110 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 linden/indra/newview/llvowlsky.h

(limited to 'linden/indra/newview/llvowlsky.h')

diff --git a/linden/indra/newview/llvowlsky.h b/linden/indra/newview/llvowlsky.h
new file mode 100644
index 0000000..3a5cb3a
--- /dev/null
+++ b/linden/indra/newview/llvowlsky.h
@@ -0,0 +1,110 @@
+/** 
+ * @file llvowlsky.h
+ * @brief LLVOWLSky class definition
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007-2008, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_VOWLSKY_H
+#define LL_VOWLSKY_H
+
+#include "llviewerobject.h"
+
+class LLVOWLSky : public LLStaticViewerObject {
+private:
+	static const F32 DISTANCE_TO_STARS;
+
+	// anything less than 3 makes it impossible to create a closed dome.
+	static const U32 MIN_SKY_DETAIL;
+	// anything bigger than about 180 will cause getStripsNumVerts() to exceed 65535.
+	static const U32 MAX_SKY_DETAIL;
+
+	inline static U32 getNumStacks(void);
+	inline static U32 getNumSlices(void);
+	inline static U32 getFanNumVerts(void);
+	inline static U32 getFanNumIndices(void);
+	inline static U32 getStripsNumVerts(void);
+	inline static U32 getStripsNumIndices(void);
+	inline static U32 getStarsNumVerts(void);
+	inline static U32 getStarsNumIndices(void);
+
+public:
+	LLVOWLSky(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp);
+
+	void initSunDirection(LLVector3 const & sun_direction,
+		LLVector3 const & sun_angular_velocity);
+
+	/*virtual*/ BOOL		 idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time);
+	/*virtual*/ BOOL		 isActive(void) const;
+	/*virtual*/ LLDrawable * createDrawable(LLPipeline *pipeline);
+	/*virtual*/ BOOL		 updateGeometry(LLDrawable *drawable);
+
+	void drawStars(void);
+	void drawDome(void);
+	void resetVertexBuffers(void);
+	
+	void cleanupGL();
+	void restoreGL();
+
+private:
+	// a tiny helper function for controlling the sky dome tesselation.
+	static F32 calcPhi(U32 i);
+
+	// helper function for initializing the stars.
+	void initStars();
+
+	// helper function for building the fan vertex buffer.
+	static void buildFanBuffer(LLStrider<LLVector3> & vertices,
+							   LLStrider<LLVector2> & texCoords,
+							   LLStrider<U16> & indices);
+
+	// helper function for building the strips vertex buffer.
+	// note begin_stack and end_stack follow stl iterator conventions,
+	// begin_stack is the first stack to be included, end_stack is the first
+	// stack not to be included.
+	static void buildStripsBuffer(U32 begin_stack, U32 end_stack,
+								  LLStrider<LLVector3> & vertices,
+								  LLStrider<LLVector2> & texCoords,
+								  LLStrider<U16> & indices);
+
+	// helper function for updating the stars colors.
+	void updateStarColors();
+
+	// helper function for updating the stars geometry.
+	BOOL updateStarGeometry(LLDrawable *drawable);
+
+private:
+	LLPointer<LLVertexBuffer>					mFanVerts;
+	std::vector< LLPointer<LLVertexBuffer> >	mStripsVerts;
+	LLPointer<LLVertexBuffer>					mStarsVerts;
+
+	std::vector<LLVector3>	mStarVertices;				// Star verticies
+	std::vector<LLColor4>	mStarColors;				// Star colors
+	std::vector<F32>		mStarIntensities;			// Star intensities
+};
+
+#endif // LL_VOWLSKY_H
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