diff options
| author | Joe Ludwig <[email protected]> | 2013-06-26 15:22:04 -0700 |
|---|---|---|
| committer | Joe Ludwig <[email protected]> | 2013-06-26 15:22:04 -0700 |
| commit | 39ed87570bdb2f86969d4be821c94b722dc71179 (patch) | |
| tree | abc53757f75f40c80278e87650ea92808274aa59 /mp/src/game/client/c_tracer.cpp | |
| download | source-sdk-2013-39ed87570bdb2f86969d4be821c94b722dc71179.tar.xz source-sdk-2013-39ed87570bdb2f86969d4be821c94b722dc71179.zip | |
First version of the SOurce SDK 2013
Diffstat (limited to 'mp/src/game/client/c_tracer.cpp')
| -rw-r--r-- | mp/src/game/client/c_tracer.cpp | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/mp/src/game/client/c_tracer.cpp b/mp/src/game/client/c_tracer.cpp new file mode 100644 index 00000000..4377dc42 --- /dev/null +++ b/mp/src/game/client/c_tracer.cpp @@ -0,0 +1,152 @@ +//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+#include "cbase.h"
+#include "particledraw.h"
+#include "materialsystem/imesh.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Sees if the tracer is behind the camera or should be culled
+//-----------------------------------------------------------------------------
+
+static bool ClipTracer( const Vector &start, const Vector &delta, Vector &clippedStart, Vector &clippedDelta )
+{
+ // dist1 = start dot forward - origin dot forward
+ // dist2 = (start + delta ) dot forward - origin dot forward
+ // in camera space this is -start[2] since origin = 0 and vecForward = (0, 0, -1)
+ float dist1 = -start[2];
+ float dist2 = dist1 - delta[2];
+
+ // Clipped, skip this tracer
+ if ( dist1 <= 0 && dist2 <= 0 )
+ return true;
+
+ clippedStart = start;
+ clippedDelta = delta;
+
+ // Needs to be clipped
+ if ( dist1 <= 0 || dist2 <= 0 )
+ {
+ float fraction = dist2 - dist1;
+
+ // Too close to clipping plane
+ if ( fraction < 1e-3 && fraction > -1e-3 )
+ return true;
+
+ fraction = -dist1 / fraction;
+
+ if ( dist1 <= 0 )
+ {
+ VectorMA( start, fraction, delta, clippedStart );
+ }
+ else
+ {
+ VectorMultiply( delta, fraction, clippedDelta );
+ }
+ }
+
+ return false;
+}
+
+
+//-----------------------------------------------------------------------------
+// Computes the four verts to draw the tracer with
+//-----------------------------------------------------------------------------
+bool Tracer_ComputeVerts( const Vector &start, const Vector &delta, float width, Vector *pVerts )
+{
+ Vector clippedStart, clippedDelta;
+
+ // Clip the tracer
+ if ( ClipTracer( start, delta, clippedStart, clippedDelta ) )
+ return false;
+
+ // Figure out direction in camera space of the normal
+ Vector normal;
+ CrossProduct( clippedDelta, clippedStart, normal );
+
+ // don't draw if they are parallel
+ float sqLength = DotProduct( normal, normal );
+ if (sqLength < 1e-3)
+ return false;
+
+ // Resize the normal to be appropriate based on the width
+ VectorScale( normal, 0.5f * width / sqrt(sqLength), normal );
+
+ VectorSubtract( clippedStart, normal, pVerts[0] );
+ VectorAdd( clippedStart, normal, pVerts[1] );
+
+ VectorAdd( pVerts[0], clippedDelta, pVerts[2] );
+ VectorAdd( pVerts[1], clippedDelta, pVerts[3] );
+
+ return true;
+}
+
+
+void Tracer_Draw( CMeshBuilder *pMeshBuilder, Vector& start, Vector& delta, float width, float* color, float startV, float endV )
+{
+ // Clip the tracer
+ Vector verts[4];
+ if (!Tracer_ComputeVerts( start, delta, width, verts ))
+ return;
+
+ // NOTE: Gotta get the winding right so it's not backface culled
+ // (we need to turn of backface culling for these bad boys)
+ pMeshBuilder->Position3f( verts[0].x, verts[0].y, verts[0].z );
+ pMeshBuilder->TexCoord2f( 0, 0.0f, startV );
+ if (color)
+ {
+ pMeshBuilder->Color4fv( color );
+ }
+ else
+ {
+ pMeshBuilder->Color4ub( 255, 255, 255, 255 );
+ }
+ pMeshBuilder->AdvanceVertex();
+
+ pMeshBuilder->Position3f( verts[1].x, verts[1].y, verts[1].z );
+ pMeshBuilder->TexCoord2f( 0, 1.0f, startV );
+ if (color)
+ {
+ pMeshBuilder->Color4fv( color );
+ }
+ else
+ {
+ pMeshBuilder->Color4ub( 255, 255, 255, 255 );
+ }
+ pMeshBuilder->AdvanceVertex();
+
+ pMeshBuilder->Position3f( verts[3].x, verts[3].y, verts[3].z );
+ pMeshBuilder->TexCoord2f( 0, 1.0f, endV );
+ if (color)
+ pMeshBuilder->Color4fv( color );
+ else
+ pMeshBuilder->Color4ub( 255, 255, 255, 255 );
+ pMeshBuilder->AdvanceVertex();
+
+ pMeshBuilder->Position3f( verts[2].x, verts[2].y, verts[2].z );
+ pMeshBuilder->TexCoord2f( 0, 0.0f, endV );
+ if (color)
+ pMeshBuilder->Color4fv( color );
+ else
+ pMeshBuilder->Color4ub( 255, 255, 255, 255 );
+ pMeshBuilder->AdvanceVertex();
+}
+
+
+//-----------------------------------------------------------------------------
+// draw a tracer.
+//-----------------------------------------------------------------------------
+void Tracer_Draw( ParticleDraw* pDraw, Vector& start, Vector& delta, float width, float* color, float startV, float endV )
+{
+ if( !pDraw->GetMeshBuilder() )
+ return;
+
+ Tracer_Draw( pDraw->GetMeshBuilder(), start, delta, width, color, startV, endV );
+}
|