rg3d 0.24.0

3D Game engine
Documentation 
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uniform sampler2D diffuseTexture;
uniform sampler2D depthBufferTexture;
uniform vec2 invScreenSize;
uniform vec2 projParams;
uniform float softBoundarySharpnessFactor;

out vec4 FragColor;
in vec2 texCoord;
in vec4 color;

float toProjSpace(float z)
{
    float far = projParams.x;
    float near = projParams.y;
    return (far * near) / (far - z * (far - near));
}

void main()
{
    float sceneDepth = toProjSpace(texture(depthBufferTexture, gl_FragCoord.xy * invScreenSize).r);
    float fragmentDepth = toProjSpace(gl_FragCoord.z);
    float depthOpacity = smoothstep((sceneDepth - fragmentDepth) * softBoundarySharpnessFactor, 0.0, 1.0);
    FragColor = color * S_SRGBToLinear(texture(diffuseTexture, texCoord)).r;
    FragColor.a *= depthOpacity;
}