1

materialsystem/stdshaders/sfm_downsample.cpp

@@ -0,0 +1,103 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//===========================================================================//
+
+#include "BaseVSShader.h"
+#include "common_hlsl_cpp_consts.h"
+
+#include "Downsample_ps20.inc"
+#include "Downsample_ps20b.inc"
+
+BEGIN_VS_SHADER_FLAGS( sfm_downsample_shader, "Help for Downsample", SHADER_NOT_EDITABLE )
+	BEGIN_SHADER_PARAMS
+	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() )
+			{
+				DECLARE_STATIC_PIXEL_SHADER( downsample_ps20b );
+				SET_STATIC_PIXEL_SHADER( downsample_ps20b );
+			}
+			else
+			{
+				DECLARE_STATIC_PIXEL_SHADER( downsample_ps20 );
+				SET_STATIC_PIXEL_SHADER( downsample_ps20 );
+			}
+		}
+
+		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 );
+
+			// Setup luminance threshold (all values are scaled down by max luminance)
+//			v[0] = 1.0f / MAX_HDR_OVERBRIGHT;
+			v[0] = 0.0f;
+			pShaderAPI->SetPixelShaderConstant( 0, v, 1 );
+
+			pShaderAPI->SetVertexShaderIndex( 0 );
+			if( g_pHardwareConfig->SupportsPixelShaders_2_b() )
+			{
+				DECLARE_DYNAMIC_PIXEL_SHADER( downsample_ps20b );
+				SET_DYNAMIC_PIXEL_SHADER( downsample_ps20b );
+			}
+			else
+			{
+				DECLARE_DYNAMIC_PIXEL_SHADER( downsample_ps20 );
+				SET_DYNAMIC_PIXEL_SHADER( downsample_ps20 );
+			}
+		}
+		Draw();
+	}
+END_SHADER