102 lines
2.2 KiB
HLSL
102 lines
2.2 KiB
HLSL
#ifndef UI_BLUR_CGINC
|
|
#define UI_BLUR_CGINC
|
|
|
|
#include "UnityCG.cginc"
|
|
|
|
// Pixel size.
|
|
static const float2 ps = _ScreenParams.zw - 1.0;
|
|
|
|
// Parameters.
|
|
sampler2D _MainTex;
|
|
float _Opacity, _Size;
|
|
|
|
// Functions.
|
|
|
|
// Creates a linear blur from a projected texture.
|
|
// The blur is made centered, so the direction is always absolute.
|
|
// sp - Texture sampler.
|
|
// uv - Texture coordinates.
|
|
// dir - Blur direction vector.
|
|
float4 linear_blur(sampler2D sp, float4 uv, float2 dir) {
|
|
static const int samples = 9;
|
|
|
|
float4 color = 0.0;
|
|
|
|
// Move coordinates in opposite direction to center the sampling.
|
|
uv = UNITY_PROJ_COORD(float4(
|
|
uv.x - dir.x * samples * 0.5,
|
|
uv.y - dir.y * samples * 0.5,
|
|
uv.z,
|
|
uv.w
|
|
));
|
|
|
|
[unroll]
|
|
for (int i = 0; i < samples; ++i) {
|
|
uv = UNITY_PROJ_COORD(float4(
|
|
uv.x + dir.x,
|
|
uv.y + dir.y,
|
|
uv.z,
|
|
uv.w
|
|
));
|
|
color += tex2Dproj(sp, uv);
|
|
}
|
|
|
|
return color / samples;
|
|
}
|
|
|
|
// Vertex shaders.
|
|
|
|
void VS_Quad(
|
|
float4 v : POSITION,
|
|
out float4 p : SV_POSITION,
|
|
inout float2 uv : TEXCOORD
|
|
) {
|
|
p = UnityObjectToClipPos(v);
|
|
}
|
|
|
|
void VS_QuadProj(
|
|
float4 v : POSITION,
|
|
out float4 p : SV_POSITION,
|
|
inout float2 uv1 : TEXCOORD0,
|
|
out float4 uv2 : TEXCOORD1
|
|
) {
|
|
VS_Quad(v, p, uv1);
|
|
uv2 = ComputeGrabScreenPos(p);
|
|
}
|
|
|
|
void VS_QuadProjColor(
|
|
float4 v : POSITION,
|
|
out float4 p : SV_POSITION,
|
|
inout float2 uv1 : TEXCOORD0,
|
|
out float4 uv2 : texcoord2,
|
|
inout float4 img_color : COLOR
|
|
) {
|
|
VS_QuadProj(v, p, uv1, uv2);
|
|
}
|
|
|
|
// Pixel shader functions (for changing the grab pass texture).
|
|
|
|
float4 blur_x(float2 img_uv, float4 grab_uv, sampler2D grab_tex) {
|
|
float2 dir = float2(ps.x * _Size, 0.0);
|
|
|
|
float4 blur = linear_blur(grab_tex, grab_uv, dir);
|
|
blur.a = 1.0;
|
|
|
|
float4 color = tex2D(_MainTex, img_uv);
|
|
|
|
return blur * color.a;
|
|
}
|
|
|
|
float4 blur_y(float2 img_uv, float4 grab_uv, float4 img_color, sampler2D grab_tex) {
|
|
float2 dir = float2(0.0, ps.y * _Size);
|
|
|
|
float4 blur = linear_blur(grab_tex, grab_uv, dir);
|
|
blur.a = 1.0;
|
|
|
|
float4 color = tex2D(_MainTex, img_uv) * img_color;
|
|
color = lerp(blur * color.a, color, _Opacity);
|
|
|
|
return color;
|
|
}
|
|
|
|
#endif |