Added bloom shader and screenspace effect helpers as examples for the SDK.

mp/src/materialsystem/stdshaders/SDK_Bloom_ps2x.fxc

@@ -0,0 +1,21 @@
+// STATIC: "CONVERT_TO_SRGB" "0..1"	[ps20b][= g_pHardwareConfig->NeedsShaderSRGBConversion()] [PC]
+// STATIC: "CONVERT_TO_SRGB" "0..0"	[= 0] [XBOX]
+
+#define HDRTYPE HDR_TYPE_NONE
+#include "common_ps_fxc.h"
+
+sampler FBSampler	: register( s0 );
+sampler BlurSampler	: register( s1 );
+
+struct PS_INPUT
+{
+	float2 texCoord				: TEXCOORD0;
+};
+
+float4 main( PS_INPUT i ) : COLOR
+{
+	float4 fbSample = tex2D( FBSampler, i.texCoord );
+	float4 blurSample = tex2D( BlurSampler, i.texCoord );
+
+	return FinalOutput( float4( fbSample + blurSample.rgb * blurSample.a * MAX_HDR_OVERBRIGHT, 1.0f ), 0, PIXEL_FOG_TYPE_NONE, TONEMAP_SCALE_NONE );
+}