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HLSL code optimize

The following HLSL pixel shader code is used to perform a 4x4 downsample using a simple box filter. give a way to greatly reduce cost of this shader.

float4 g_OffsetsSample[16];

texture g_Texture;

sampler2D g_Sampler = sampler_state;


texture = (g_Texture);

MinFilter = Point;

MagFilter = Point;

MipFilter = Point;


float4 PSMain(float2 vTexCoord : TEXCOORD0) : COLOR


float4 sample = 0.0f;

for(int i =0; i<16;i++)


sample += tex2D(g_Sampler, vTexCoord + g_OffsetsSample .xy);


return sample * (1/16.f);



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