20w22a Depth Shader Example

blit_util.vsh

#version 110

attribute vec4 Position;

uniform mat4 ProjMat;
uniform vec2 InSize;

varying vec2 texCoord;
varying vec2 oneTexel;

void main(){
    vec4 outPos = ProjMat * vec4(Position.xy, 0.0, 1.0);
    gl_Position = vec4(outPos.xy, 0.2, 1.0);

    oneTexel = 1.0 / InSize;
    texCoord = outPos.xy * 0.5 + 0.5;
}

depth_test.fsh

#version 110

uniform sampler2D DiffuseSampler;
uniform sampler2D DiffuseDepthSampler;

varying vec2 texCoord;
varying vec2 oneTexel;

void main() {
    gl_FragColor = 1.0-(1.0-texture2D(DiffuseDepthSampler, texCoord))*500.0;
}

depth_test.json

{
    "blend": {
        "func": "add",
        "srcrgb": "one",
        "dstrgb": "zero"
    },
    "vertex": "blit_util",
    "fragment": "depth_test",
    "attributes": [ "Position" ],
    "samplers": [
        { "name": "DiffuseSampler" },
        { "name": "DiffuseDepthSampler" }
    ],
    "uniforms": [
        { "name": "ProjMat",    "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
        { "name": "InSize",     "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
        { "name": "OutSize",    "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] }
    ]
}

transparency.json

{
    "targets": [
        "water",
        "translucent",
        "itemEntity",
        "particles",
        "clouds",
        "weather",
        "final",
        "swap"
    ],
    "passes": [
        {
            "name": "transparency",
            "intarget": "minecraft:main",
            "outtarget": "swap",
            "auxtargets": [
                {
                    "name": "DiffuseDepthSampler",
                    "id": "minecraft:main:depth"
                },
                {
                    "name": "TranslucentSampler",
                    "id": "translucent"
                },
                {
                    "name": "TranslucentDepthSampler",
                    "id": "translucent:depth"
                },
                {
                    "name": "ItemEntitySampler",
                    "id": "itemEntity"
                },
                {
                    "name": "ItemEntityDepthSampler",
                    "id": "itemEntity:depth"
                },
                {
                    "name": "ParticlesSampler",
                    "id": "particles"
                },
                {
                    "name": "ParticlesDepthSampler",
                    "id": "particles:depth"
                },
                {
                    "name": "CloudsSampler",
                    "id": "clouds"
                },
                {
                    "name": "CloudsDepthSampler",
                    "id": "clouds:depth"
                },
                {
                    "name": "WeatherSampler",
                    "id": "weather"
                },
                {
                    "name": "WeatherDepthSampler",
                    "id": "weather:depth"
                }
            ]
        },
        {
            "name": "depth_test",
            "intarget": "swap",
            "outtarget": "final",
            "auxtargets": [
                {
                    "name": "DiffuseDepthSampler",
                    "id": "minecraft:main:depth"
                }
            ]
        },
        {
            "name": "blit",
            "intarget": "final",
            "outtarget": "minecraft:main",
            "auxtargets": [
                {
                    "name": "DiffuseDepthSampler",
                    "id": "minecraft:main:depth"
                }
            ]
        }
    ]
}