1、差值
shader
//差值
uniform sampler2D U_MainTexture;
uniform sampler2D U_SubTexture;
varying vec2 M_coord;
void main()
{
vec4 blendColor = texture2D(U_SubTexture, M_coord);
vec4 baseColor = 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
uniform sampler2D U_MainTexture;
uniform sampler2D U_SubTexture;
varying vec2 M_coord;
void main()
{
vec4 blendColor = texture2D(U_SubTexture, M_coord);
vec4 baseColor = 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
uniform sampler2D U_MainTexture;
uniform sampler2D U_SubTexture;
varying vec2 M_coord;
void main()
{
vec4 blendColor = texture2D(U_SubTexture, M_coord);
vec4 baseColor = texture2D(U_MainTexture, M_coord);
gl_FragColor = vec4(blendColor.rgb + baseColor.rgb - 2.0 * blendColor.rgb * baseColor.rgb, 1.0);
}效果图
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