Unity3d《Shader篇》绘制圆角图片

Pass

        {

            CGPROGRAM

// Upgrade NOTE: excluded shader from OpenGL ES 2.0 because it does not contain a surface program or both vertex and fragment programs.

#pragma exclude_renderers gles

            

            #pragma fragment frag

            #include "UnityCG.cginc"

            

            sampler2D _MainTex;

            float4 _MainColor;

            float _RoundRadius;

            

            struct texCoord

            {

                float2 inputTexCoord : TEXCOORD0;

            };

            

            

            float4 frag(texCoord input) : COLOR

            {

                float x = input.inputTexCoord.x;

                float y = input.inputTexCoord.y;

                float4 col = tex2D(_MainTex,input.inputTexCoord)*_MainColor;

                

                float radius = _RoundRadius;

                

                if(x<radius && y<radius)

                {

                    if(pow(x-radius,2)+pow(y-radius,2)>radius*radius)

                    {

                        discard;

                    }

                }

                else if(x>1-radius && y>1-radius)

                {

                    if(pow(x-(1-radius),2)+pow(y-(1-radius),2)>radius*radius)

                    {

                        discard;

                    }

                }

                else if(x<radius && y>1-radius)

                {

                    if(pow(x-radius,2)+pow(y-(1-radius),2)>radius*radius)

                    {

                        discard;

                    }

                }

                

                else if(x>1-radius && y<radius)

                {

                    if(pow(x-(1-radius),2)+pow(y-radius,2)>radius*radius)

                    {

                        discard;

                    }

                }

                

                return col;

            }

            

            ENDCG

        }

效果图