Unity UI 模糊效果

UIBlur.cginc

#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 c