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// license:BSD-3-Clause
// copyright-holders:ImJezze
//-----------------------------------------------------------------------------
// Distortion Effect
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Sampler Definitions
//-----------------------------------------------------------------------------
texture DiffuseTexture;
sampler DiffuseSampler = sampler_state
{
Texture = <DiffuseTexture>;
MipFilter = LINEAR;
MinFilter = LINEAR;
MagFilter = LINEAR;
AddressU = CLAMP;
AddressV = CLAMP;
AddressW = CLAMP;
};
//-----------------------------------------------------------------------------
// Vertex Definitions
//-----------------------------------------------------------------------------
struct VS_INPUT
{
float4 Position : POSITION;
float4 Color : COLOR0;
float2 TexCoord : TEXCOORD0;
};
struct VS_OUTPUT
{
float4 Position : POSITION;
float4 Color : COLOR0;
float2 TexCoord : TEXCOORD0;
};
struct PS_INPUT
{
float4 Color : COLOR0;
float2 TexCoord : TEXCOORD0;
};
//-----------------------------------------------------------------------------
// Distortion Vertex Shader
//-----------------------------------------------------------------------------
uniform float2 ScreenDims; // size of the window or fullscreen
uniform float2 TargetDims;
VS_OUTPUT vs_main(VS_INPUT Input)
{
VS_OUTPUT Output = (VS_OUTPUT)0;
Output.Position = float4(Input.Position.xyz, 1.0f);
Output.Position.xy /= ScreenDims;
Output.Position.y = 1.0f - Output.Position.y; // flip y
Output.Position.xy -= 0.5f; // center
Output.Position.xy *= 2.0f; // zoom
Output.Color = Input.Color;
Output.TexCoord = Input.Position.xy / ScreenDims;
Output.TexCoord += 0.5f / TargetDims; // half texel offset correction (DX9)
return Output;
}
//-----------------------------------------------------------------------------
// Post-Processing Pixel Shader
//-----------------------------------------------------------------------------
float4 ps_main(PS_INPUT Input) : COLOR
{
float2 BaseCoord = Input.TexCoord;
// Color
float4 BaseColor = tex2D(DiffuseSampler, BaseCoord);
BaseColor.a = 1.0f;
return BaseColor;
}
//-----------------------------------------------------------------------------
// Distortion Effect
//-----------------------------------------------------------------------------
technique DefaultTechnique
{
pass Pass0
{
Lighting = FALSE;
VertexShader = compile vs_3_0 vs_main();
PixelShader = compile ps_3_0 ps_main();
}
}
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