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1 files changed, 111 insertions, 0 deletions

diff --git a/materialsystem/stdshaders/sample4x4_blend.cpp b/materialsystem/stdshaders/sample4x4_blend.cpp
new file mode 100644
index 0000000..4bdc8b1
--- /dev/null
+++ b/materialsystem/stdshaders/sample4x4_blend.cpp
@@ -0,0 +1,111 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "BaseVSShader.h"
+#include "common_hlsl_cpp_consts.h"
+
+
+BEGIN_VS_SHADER( Sample4x4_Blend, "Help for Sample4x4_Blend" )
+	BEGIN_SHADER_PARAMS
+		SHADER_PARAM( BASETEXTURE, SHADER_PARAM_TYPE_TEXTURE, "", "" )
+		SHADER_PARAM( PIXSHADER, SHADER_PARAM_TYPE_STRING, "sample4x4_ps20", "Name of the pixel shader to use" )
+	END_SHADER_PARAMS
+
+	SHADER_INIT
+	{
+		LoadTexture( BASETEXTURE );
+	}
+	
+	SHADER_FALLBACK
+	{
+		// Requires DX9 + above
+		if (!g_pHardwareConfig->SupportsVertexAndPixelShaders())
+		{
+			Assert( 0 );
+			return "Wireframe";
+		}
+		return 0;
+	}
+
+	SHADER_DRAW
+	{
+		SHADOW_STATE
+		{
+			pShaderShadow->EnableDepthWrites( false );
+			pShaderShadow->EnableAlphaWrites( true );
+			
+			pShaderShadow->EnableTexture( SHADER_SAMPLER0, true );
+			int fmt = VERTEX_POSITION;
+			pShaderShadow->VertexShaderVertexFormat( fmt, 1, 0, 0 );
+			
+			pShaderShadow->SetVertexShader( "Downsample_vs20", 0 );
+			
+			if( g_pHardwareConfig->SupportsPixelShaders_2_b() )
+			{
+				const char *szPixelShader = params[PIXSHADER]->GetStringValue();
+				size_t iLength = Q_strlen( szPixelShader );
+
+				if( (iLength > 5) && (Q_stricmp( &szPixelShader[iLength - 5], "_ps20" ) == 0) ) //detect if it's trying to load a ps20 shader
+				{
+					//replace it with the ps20b shader
+					char *szNewName = (char *)stackalloc( sizeof( char ) * (iLength + 2) );
+					memcpy( szNewName, szPixelShader, sizeof( char ) * iLength );
+					szNewName[iLength] = 'b';
+					szNewName[iLength + 1] = '\0';
+					pShaderShadow->SetPixelShader( szNewName, 0 );
+				}
+				else
+				{
+					pShaderShadow->SetPixelShader( params[PIXSHADER]->GetStringValue(), 0 );
+				}
+			}
+			else
+			{
+				pShaderShadow->SetPixelShader( params[PIXSHADER]->GetStringValue(), 0 );
+			}
+
+			pShaderShadow->EnableBlending( true );
+			pShaderShadow->BlendFunc( SHADER_BLEND_SRC_ALPHA,
+									  SHADER_BLEND_ONE_MINUS_SRC_ALPHA );
+		}
+
+		DYNAMIC_STATE
+		{
+			BindTexture( SHADER_SAMPLER0, BASETEXTURE, -1 );
+			ITexture *src_texture=params[BASETEXTURE]->GetTextureValue();
+
+			int width=src_texture->GetActualWidth();
+			int height=src_texture->GetActualHeight();
+
+			float v[4];
+			float dX = 1.0f / width;
+			float dY = 1.0f / height;
+
+			v[0] = -dX;
+			v[1] = -dY;
+			pShaderAPI->SetVertexShaderConstant( VERTEX_SHADER_SHADER_SPECIFIC_CONST_0, v, 1 );
+			v[0] = -dX;
+			v[1] = dY;
+			pShaderAPI->SetVertexShaderConstant( VERTEX_SHADER_SHADER_SPECIFIC_CONST_1, v, 1 );
+			v[0] = dX;
+			v[1] = -dY;
+			pShaderAPI->SetVertexShaderConstant( VERTEX_SHADER_SHADER_SPECIFIC_CONST_2, v, 1 );
+			v[0] = dX;
+			v[1] = dY;
+			pShaderAPI->SetVertexShaderConstant( VERTEX_SHADER_SHADER_SPECIFIC_CONST_3, v, 1 );
+
+			pShaderAPI->SetVertexShaderIndex( 0 );
+			pShaderAPI->SetPixelShaderIndex( 0 );
+
+			// store the ALPHA material var into c0
+			v[0] = ALPHA;
+			pShaderAPI->SetPixelShaderConstant( 0, v, 1 );
+			
+		}
+		Draw();
+	}
+END_SHADER