从一个纹理到另一个纹理的平滑步进渐变过渡取决于另一个纹理的亮度

如何解决从一个纹理到另一个纹理的平滑步进渐变过渡取决于另一个纹理的亮度

我希望能够根据另一个纹理 (texture2) 的颜色/亮度平滑地从一个纹理 (texture0) 过渡到另一个 (texture1)。

我可以使两个纹理重叠，但无法找到平滑步进纹理的解决方案。

    vec4 texture0 = texture2D(text0,vec2(text0_texture_x,text0_texture_y));
    vec4 texture1 = texture2D(text1,vec2(text1_texture_x,text1_texture_y));
    vec4 texture2 = texture2D(text2,vec2(text2_texture_x,text2_texture_y));


    if((texture2.r < 0.58 && texture2.r > 0.5) && (texture2.g < 0.58 && texture2.g > 0.5 ) && (texture2.b < 0.58 && texture2.b > 0.5)){
            if(texture1.r > 1.0){
                othertexture.a = 1.0;
            }
            else if(texture1.r <= 1.0){
                othertexture.a = othertexture_data_transparency + 0.25;
            }
            
            othertexture.rgb *= othertexture.a;
            texture0.rgb *= texture0.a;
            
            
            vec4 texture0_final_color;
            texture0_final_color.rgb = othertexture.rgb + (texture0.rgb * (1.0 - othertexture.a));
            texture0_final_color.a = othertexture.a + (texture0.a * (1.0 - othertexture.a));
            texture1.rgb *= texture1.a;
            
            vec4 texture1_final_color;
            texture1_final_color.rgb = othertexture.rgb + (texture1.rgb * (1.0 - othertexture.a));
            texture1_final_color.a = othertexture.a + (texture1.a * (1.0 - othertexture.a));
            // gl_FragColor = texture0_final_color*(1.0 - 0.1) + texture1_final_color*0.3;

            gl_FragColor = (texture0_final_color*(1.0 - 0.4) + texture1_final_color*0.3);
            // gl_FragColor = smoothstep(0.0,0.9,texture2);
        }


        else if(texture2.r < 0.5 && texture2.g < 0.5 && texture2.b < 0.5){
            othertexture.a = othertexture_data_transparency;
            othertexture.rgb *= othertexture.a;
            texture0.rgb *= texture0.a;
            
            
            vec4 texture0_final_color;
            texture0_final_color.rgb = othertexture.rgb + (texture0.rgb * (1.0 - othertexture.a));
            texture0_final_color.a = othertexture.a + (texture0.a * (1.0 - othertexture.a));
            gl_FragColor = texture0_final_color;



        }
        else{
        
            if(texture1.r > 1.0){
                othertexture.a = 1.0;
            }
            else if(texture1.r <= 1.0){
                othertexture.a = othertexture_data_transparency + 0.25;
            }
            
            othertexture.rgb *= othertexture.a;
            texture1.rgb *= texture1.a;
            
            vec4 texture1_final_color;
            texture1_final_color.rgb = othertexture.rgb + (texture1.rgb * (1.0 - othertexture.a));
            texture1_final_color.a = othertexture.a + (texture1.a * (1.0 - othertexture.a));
            gl_FragColor = texture1_final_color;

        }
}

是否有更好的阶梯梯度解决方案来平滑过渡两个着色器？