1、差值

shader

//差值uniformsampler2DU_MainTexture;uniformsampler2DU_SubTexture;varyingvec2M_coord;voidmain(){vec4blendColor=texture2D(U_SubTexture,M_coord);vec4baseColor=texture2D(U_MainTexture,M_coord);gl_FragColor=abs(vec4(blendColor.rgb-baseColor.rgb,1.0));}

效果图


2、反差值

shader

//反差值uniformsampler2DU_MainTexture;uniformsampler2DU_SubTexture;varyingvec2M_coord;voidmain(){vec4blendColor=texture2D(U_SubTexture,M_coord);vec4baseColor=texture2D(U_MainTexture,M_coord);gl_FragColor=vec4(vec3(1.0)-abs(vec3(blendColor.rgb-baseColor.rgb)),1.0);}

效果图


3、排除

shader

//排除uniformsampler2DU_MainTexture;uniformsampler2DU_SubTexture;varyingvec2M_coord;voidmain(){vec4blendColor=texture2D(U_SubTexture,M_coord);vec4baseColor=texture2D(U_MainTexture,M_coord);gl_FragColor=vec4(blendColor.rgb+baseColor.rgb-2.0*blendColor.rgb*baseColor.rgb,1.0);}

效果图