From 39ed87570bdb2f86969d4be821c94b722dc71179 Mon Sep 17 00:00:00 2001
From: Joe Ludwig <joe@valvesoftware.com>
Date: Wed, 26 Jun 2013 15:22:04 -0700
Subject: First version of the SOurce SDK 2013

---
 mp/src/game/client/view_scene.cpp | 155 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 mp/src/game/client/view_scene.cpp

(limited to 'mp/src/game/client/view_scene.cpp')

diff --git a/mp/src/game/client/view_scene.cpp b/mp/src/game/client/view_scene.cpp
new file mode 100644
index 00000000..33e3f4bf
--- /dev/null
+++ b/mp/src/game/client/view_scene.cpp
@@ -0,0 +1,155 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Responsible for drawing the scene
+//
+//===========================================================================//
+
+#include "cbase.h"
+#include "materialsystem/imaterialsystem.h"
+#include "materialsystem/imaterialvar.h"
+#include "materialsystem/imaterialsystemhardwareconfig.h"
+#include "rendertexture.h"
+#include "view_scene.h"
+#include "viewrender.h"
+#include "headtrack/isourcevirtualreality.h"
+#include "client_virtualreality.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Convars related to controlling rendering
+//-----------------------------------------------------------------------------
+ConVar r_updaterefracttexture( "r_updaterefracttexture", "1", FCVAR_CHEAT );
+ConVar r_depthoverlay( "r_depthoverlay", "0", FCVAR_CHEAT, "Replaces opaque objects with their grayscaled depth values. r_showz_power scales the output." );
+
+
+int g_viewscene_refractUpdateFrame = 0;
+bool g_bAllowMultipleRefractUpdatesPerScenePerFrame = false;
+
+#if defined( _X360 )
+class CAllowMultipleRefractsLogic : public CAutoGameSystem
+{
+public:
+	void LevelInitPreEntity()
+	{
+		// EP1 core room needs many refract updates per frame to avoid looking broken (ep1_citadel_03)
+		// Same with Kleiner's lab (d1_trainstation_05)
+		g_bAllowMultipleRefractUpdatesPerScenePerFrame = FStrEq( MapName(), "ep1_citadel_03" ) || FStrEq( MapName(), "d1_trainstation_05" );
+	}
+};
+static CAllowMultipleRefractsLogic s_AllowMultipleRefractsLogic;
+#endif
+
+void ViewTransform( const Vector &worldSpace, Vector &viewSpace )
+{
+	const VMatrix &viewMatrix = engine->WorldToViewMatrix();
+	Vector3DMultiplyPosition( viewMatrix, worldSpace, viewSpace );
+}
+
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Transforms a world-space position into a 2D position inside a supplied frustum.
+//-----------------------------------------------------------------------------
+int FrustumTransform( const VMatrix &worldToSurface, const Vector& point, Vector& screen )
+{
+	// UNDONE: Clean this up some, handle off-screen vertices
+	float w;
+
+	screen.x = worldToSurface[0][0] * point[0] + worldToSurface[0][1] * point[1] + worldToSurface[0][2] * point[2] + worldToSurface[0][3];
+	screen.y = worldToSurface[1][0] * point[0] + worldToSurface[1][1] * point[1] + worldToSurface[1][2] * point[2] + worldToSurface[1][3];
+	//	z		 = worldToSurface[2][0] * point[0] + worldToSurface[2][1] * point[1] + worldToSurface[2][2] * point[2] + worldToSurface[2][3];
+	w		 = worldToSurface[3][0] * point[0] + worldToSurface[3][1] * point[1] + worldToSurface[3][2] * point[2] + worldToSurface[3][3];
+
+	// Just so we have something valid here
+	screen.z = 0.0f;
+
+	bool behind;
+	if( w < 0.001f )
+	{
+		behind = true;
+		screen.x *= 100000;
+		screen.y *= 100000;
+	}
+	else
+	{
+		behind = false;
+		float invw = 1.0f / w;
+		screen.x *= invw;
+		screen.y *= invw;
+	}
+
+	return behind;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: UNDONE: Clean this up some, handle off-screen vertices
+// Input  : *point - 
+//			*screen - 
+// Output : int
+//-----------------------------------------------------------------------------
+int ScreenTransform( const Vector& point, Vector& screen )
+{
+	// UNDONE: Clean this up some, handle off-screen vertices
+	return FrustumTransform ( engine->WorldToScreenMatrix(), point, screen );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Same as ScreenTransform, but transforms to HUD space.
+//			These are totally different things in VR mode!
+//-----------------------------------------------------------------------------
+int HudTransform( const Vector& point, Vector& screen )
+{
+	if ( UseVR() )
+	{
+		return FrustumTransform ( g_ClientVirtualReality.GetHudProjectionFromWorld(), point, screen );
+	}
+	else
+	{
+		return FrustumTransform ( engine->WorldToScreenMatrix(), point, screen );
+	}
+}
+
+
+
+void UpdateFullScreenDepthTexture( void )
+{
+	if( !g_pMaterialSystemHardwareConfig->SupportsPixelShaders_2_b() )
+		return;
+
+	ITexture *pDepthTex = GetFullFrameDepthTexture();
+	CMatRenderContextPtr pRenderContext( materials );
+
+	if( IsX360() )
+	{	
+		pRenderContext->CopyRenderTargetToTextureEx( pDepthTex, -1, NULL, NULL );
+	}
+	else
+	{
+		pRenderContext->CopyRenderTargetToTextureEx( pDepthTex, 0, NULL, NULL );
+	}
+
+	pRenderContext->SetFullScreenDepthTextureValidityFlag( true );
+
+	if( r_depthoverlay.GetBool() )
+	{
+		IMaterial *pMaterial = materials->FindMaterial( "debug/showz", TEXTURE_GROUP_OTHER, true );
+		pMaterial->IncrementReferenceCount();
+		IMaterialVar *BaseTextureVar = pMaterial->FindVar( "$basetexture", NULL, false );
+		IMaterialVar *pDepthInAlpha = NULL;
+		if( IsPC() )
+		{
+			pDepthInAlpha = pMaterial->FindVar( "$ALPHADEPTH", NULL, false );
+			pDepthInAlpha->SetIntValue( 1 );
+		}
+		
+		BaseTextureVar->SetTextureValue( pDepthTex );
+
+		pRenderContext->OverrideDepthEnable( true, false ); //don't write to depth, or else we'll never see translucents
+		pRenderContext->DrawScreenSpaceQuad( pMaterial );
+		pRenderContext->OverrideDepthEnable( false, true );
+		pMaterial->DecrementReferenceCount();
+	}
+}
-- 
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