1 files changed, 93 insertions, 0 deletions
diff --git a/mp/src/materialsystem/stdshaders/debugmodifyvertex.cpp b/mp/src/materialsystem/stdshaders/debugmodifyvertex.cpp
new file mode 100644
index 00000000..c497ca95
--- /dev/null
+++ b/mp/src/materialsystem/stdshaders/debugmodifyvertex.cpp
@@ -0,0 +1,93 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: This is an example of a material that modifies vertex data
+// in the shader. NOTE: Every pass is given a clean set of vertex data.
+// Modifications made in the first pass are *not* carried over to the next pass
+// Modifications must take place during the DYNAMIC_STATE block.
+// Use the function MeshBuilder() to build the mesh 
+//
+// Also note: Using thie feature is *really expensive*! It makes a copy of
+// the vertex data *per pass!* If you wish to modify vertex data to be used
+// with all passes, your best bet is to construct a dynamic mesh instead.
+//
+// $Header: $
+// $NoKeywords: $
+//===========================================================================//
+
+#include "shaderlib/cshader.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+BEGIN_SHADER_FLAGS( DebugModifyVertex, "Help for DebugModifyVertex", SHADER_NOT_EDITABLE )
+	BEGIN_SHADER_PARAMS
+		SHADER_PARAM( WAVE, SHADER_PARAM_TYPE_FLOAT, "1.0", "wave amplitude" )
+	END_SHADER_PARAMS
+
+	SHADER_INIT
+	{
+		LoadTexture( BASETEXTURE );
+	}
+
+	SHADER_DRAW
+	{
+		if( g_pHardwareConfig->GetSamplerCount() >= 2 )
+		{
+			// lightmap
+			SHADOW_STATE
+			{
+				pShaderShadow->EnableTexture( SHADER_SAMPLER0, true );
+				pShaderShadow->EnableVertexDataPreprocess( true );
+				pShaderShadow->DrawFlags( SHADER_DRAW_POSITION | SHADER_DRAW_TEXCOORD0 );
+				FogToFogColor();
+			}
+
+			DYNAMIC_STATE
+			{
+				BindTexture( SHADER_SAMPLER0, BASETEXTURE, FRAME );
+
+				float amp = params[WAVE]->GetFloatValue();
+				float currTime = pShaderAPI->CurrentTime();
+				for (int i = 0; i < MeshBuilder()->NumVertices(); ++i)
+				{
+					float const* pPos = MeshBuilder()->Position();
+					MeshBuilder()->Position3f( pPos[0] + amp * sin( currTime + pPos[2] / 4 ),
+												pPos[1] + amp * sin( currTime + pPos[2] / 4 + 2 * 3.14 / 3 ),
+												pPos[2] + amp * sin( currTime + pPos[2] / 4 + 4 * 3.14 / 3 ) );
+					MeshBuilder()->AdvanceVertex();
+				}
+			}
+			Draw();
+
+			// base * vertex color
+			SHADOW_STATE
+			{
+				pShaderShadow->DrawFlags( SHADER_DRAW_POSITION | SHADER_DRAW_COLOR | 
+					SHADER_DRAW_TEXCOORD0 );
+				FogToFogColor();
+			}
+			DYNAMIC_STATE
+			{
+				BindTexture( SHADER_SAMPLER0, BASETEXTURE, FRAME );
+
+				// Notice here that since we didn't modify the position, and this is a second
+				// pass, the position has been reset to it's initial, unmodified position
+				float currTime = pShaderAPI->CurrentTime();
+				for (int i = 0; i < MeshBuilder()->NumVertices(); ++i)
+				{
+					float const* pPos = MeshBuilder()->Position();
+					MeshBuilder()->Color3f( ( sin( currTime + pPos[0] ) + 1.0F) * 0.5,
+											( sin( currTime + pPos[1] ) + 1.0F) * 0.5,
+											( sin( currTime + pPos[2] ) + 1.0F) * 0.5 );
+					MeshBuilder()->AdvanceVertex();
+				}
+			}
+			Draw();
+		}
+		else
+		{
+			ShaderWarning( "DebugModifyVertex: not "
+				"implemented for single-texturing hardware\n" );
+		}
+	}
+END_SHADER