emboss.hlsl

Texture2D ShaderTexture : register(t0);
SamplerState Sampler : register(s0);
cbuffer PerObject: register(b0)
{
	float4x4 ViewMatrix;
	float2 TextureSize;
	int Emboss;
	float Unused1;
};
struct VertexShaderInput
{
	float4 Position : SV_Position;
	float2 TextureUV : TEXCOORD0;
};
struct VertexShaderOutput
{
	float4 Position : SV_Position;
	float2 TextureUV : TEXCOORD0;
};
VertexShaderOutput VSMain(VertexShaderInput input)
{
	VertexShaderOutput output = (VertexShaderOutput)0;
	output.Position = mul(input.Position, ViewMatrix);
	output.TextureUV = input.TextureUV;
	return output;
}
float4 PSMain(VertexShaderOutput input) : SV_Target
{
	float2 step = float2(1.0f, 1.0f) / TextureSize;		
	float2 blv = float2(input.TextureUV.x - step.x, input.TextureUV.y - step.y);	
	float2 trv = float2(input.TextureUV.x + step.x, input.TextureUV.y + step.y);

	float3 color = float3(0.5f, 0.5f, 0.5f);	
	color -= ShaderTexture.Sample(Sampler, blv).rgb;
	color += ShaderTexture.Sample(Sampler, trv).rgb;
	
	float level = (((color.r + color.g + color.b) / 3.0f) - 0.5f) * 2.0f;
	float value1 = Emboss == 1 ? 0.0f : 1.0f;
	float value2 = Emboss == 1 ? 1.0f : 0.0f;

	if (level > 0) 
	{
		return float4(value1, value1, value1, abs(level));
	}
	return float4(value2, value2, value2, abs(level));
}