minetest/client/shaders/3d_interlaced_merge/opengl_fragment.glsl

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uniform sampler2D baseTexture;
uniform sampler2D normalTexture;
uniform sampler2D textureFlags;
#define leftImage baseTexture
#define rightImage normalTexture
#define maskImage textureFlags
varying mediump vec2 varTexCoord;
void main(void)
{
vec2 uv = varTexCoord.st;
vec4 left = texture2D(leftImage, uv).rgba;
vec4 right = texture2D(rightImage, uv).rgba;
vec4 mask = texture2D(maskImage, uv).rgba;
vec4 color;
if (mask.r > 0.5)
color = right;
else
color = left;
gl_FragColor = color;
}