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yet another retro3D shader for Unity with lower vertex precision / etc... made of parts from https://github.com/dsoft20/psx_retroshader and https://github.com/keijiro/Retro3D
// mostly from https://github.com/dsoft20/psx_retroshader
// mixed with parts of https://github.com/keijiro/Retro3D
// under MIT license by Robert Yang (https://debacle.us)
Shader "Custom/VertexLit-Retro3D" {
Properties{
_MainTex("Base (RGB)", 2D) = "white" {}
_Color("Color", Color) = (0.5, 0.5, 0.5, 1)
_GeoRes("Geometric Resolution", Float) = 40
}
SubShader {
Tags { "RenderType" = "Opaque" }
LOD 200
Pass {
Lighting On
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct v2f
{
fixed4 pos : SV_POSITION;
half4 color : COLOR0;
half4 colorFog : COLOR1;
float2 uv_MainTex : TEXCOORD0;
half3 normal : TEXCOORD1;
};
float4 _MainTex_ST;
uniform half4 unity_FogStart;
uniform half4 unity_FogEnd;
float4 _Color;
float _GeoRes;
v2f vert(appdata_full v)
{
v2f o;
// including the line below will tell Unity not to upgrade the matrix mul() operations below...
// UNITY_SHADER_NO_UPGRADE
float4 wp = mul(UNITY_MATRIX_MV, v.vertex);
wp.xyz = floor(wp.xyz * _GeoRes) / _GeoRes;
float4 sp = mul(UNITY_MATRIX_P, wp);
o.pos = sp;
//Vertex lighting
o.color = float4(ShadeVertexLightsFull(v.vertex, v.normal, 4, true), 1.0);
o.color *= v.color; // vertex color support
float distance = length(mul(UNITY_MATRIX_MV,v.vertex));
//Affine Texture Mapping
float4 affinePos = wp;
o.uv_MainTex = TRANSFORM_TEX(v.texcoord, _MainTex);
o.uv_MainTex *= distance + (wp.w*(UNITY_LIGHTMODEL_AMBIENT.a * 8)) / distance / 2;
o.normal = distance + (wp.w*(UNITY_LIGHTMODEL_AMBIENT.a * 8)) / distance / 2;
//Fog
float4 fogColor = unity_FogColor;
float fogDensity = (unity_FogEnd - distance) / (unity_FogEnd - unity_FogStart);
o.normal.g = fogDensity;
o.normal.b = 1;
o.colorFog = fogColor;
o.colorFog.a = clamp(fogDensity,0,1);
//Cut out polygons
if (distance > unity_FogStart.z + unity_FogColor.a * 255)
{
o.pos.w = 0;
}
return o;
}
sampler2D _MainTex;
float4 frag(v2f IN) : COLOR
{
half4 c = tex2D(_MainTex, IN.uv_MainTex / IN.normal.r)*IN.color *_Color;
half4 color = c*(IN.colorFog.a);
color.rgb += IN.colorFog.rgb*(1 - IN.colorFog.a);
return color;
}
ENDCG
}
}
}
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