文章目录
环境
Unity : 2020.3.37f1
原因
比如，我有
flipx : 10,
flipy : 4,
flipidx : 10 (其实是编号，不是索引)
应该是采样到是 10 的位置
到时结果采样到的是：20 的位置
解决
Shader
// jave.lin 2022/12/15 Unlit, Texture, Fog toggle, Flipbook
// 优化点：props 中 _FlipX, _FlipY, _FlipIDX 都可以合并在一 vector
// 优化点：props 中 _FogIntensity, _ClampBrightness 都可以合并在一 vector
Shader "Game/Unlit_Tex_FogToggle_Flipbook"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {
}
_FlipX ("Flip X", Int) = 1
_FlipY ("Flip Y", Int) = 1
_FlipIDX ("Flip IDX", Int) = 1
[HDR] _Color ("Color", Color) = (1, 1, 1, 1)
//[Toggle(_IS_FOG_ON)] _IS_FOG_ON ("Is Fog On", Float) = 1
[Toggle] _IS_FOG_ON ("Is Fog On", Float) = 1
_FogIntensity ("Fog Intensity", Range(0, 1)) = 1
[Toggle] _ClampBrightness ("Clamp Brightness", Int) = 0
[Header(DrawState)]
//[HideInInspector] _Mode ("__mode", Float) = 0.0
[Enum(UnityEngine.Rendering.CullMode)] _Cull("Cull Mode", Float) = 2
[Enum(Off, 0, On, 1)] _ZWrite("ZWrite", Float) = 1
[Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend("Src Blend Mode", Float) = 1
[Enum(UnityEngine.Rendering.BlendMode)] _DstBlend("Dst Blend Mode", Float) = 0
}
SubShader
{
Tags {
"RenderType"="Transparent" "Queue"="Transparent" }
Pass
{
Blend [_SrcBlend] [_DstBlend]
ZWrite [_ZWrite]
Cull [_Cull]
CGPROGRAM
#pragma skip_variants FOG_EXP FOG_EXP2
//#pragma multi_compile_fog
//#define INSTANCING_ON
//#define UNITY_INSTANCING_ENABLED
#define FOG_LINEAR
//#pragma shader_feature _ _IS_FOG_ON
#pragma multi_compile _ _CURVE_WORLD_ON
#pragma multi_compile_instancing
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
#include "UnityInstancing.cginc"
#include "Assets/Art/Shaders/CurveWorldLib.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
UNITY_VERTEX_INPUT_INSTANCE_ID
};
struct v2f
{
float4 vertex : SV_POSITION;
float2 uv : TEXCOORD0;
//#ifdef _IS_FOG_ON
UNITY_FOG_COORDS(1)
//#endif
UNITY_VERTEX_INPUT_INSTANCE_ID
};
sampler2D _MainTex;
UNITY_INSTANCING_BUFFER_START(Props)
UNITY_DEFINE_INSTANCED_PROP(int, _IS_FOG_ON)
//UNITY_DEFINE_INSTANCED_PROP(float4, _MainTex_ST)
UNITY_DEFINE_INSTANCED_PROP(int, _FlipX)
UNITY_DEFINE_INSTANCED_PROP(int, _FlipY)
UNITY_DEFINE_INSTANCED_PROP(int, _FlipIDX)
UNITY_DEFINE_INSTANCED_PROP(half4, _Color)
UNITY_DEFINE_INSTANCED_PROP(half, _FogIntensity)
UNITY_DEFINE_INSTANCED_PROP(half, _ClampBrightness)
UNITY_INSTANCING_BUFFER_END(Props)
v2f vert (appdata v)
{
v2f o = (v2f)0;
UNITY_SETUP_INSTANCE_ID(v);
UNITY_TRANSFER_INSTANCE_ID(v, o);
float4 posWorld = mul(UNITY_MATRIX_M, v.vertex);
CURVE_WORLD_APPLY(posWorld.xyz, v.vertex.xyz)
o.vertex = UnityObjectToClipPos(v.vertex);
//o.uv = TRANSFORM_TEX(v.uv, UNITY_ACCESS_INSTANCED_PROP(Props, _MainTex));
o.uv = v.uv;
//#ifdef _IS_FOG_ON
UNITY_TRANSFER_FOG(o,o.vertex);
//#endif
return o;
}
void Unity_Flipbook_float(float2 UV, float Width, float Height, float Tile, float2 Invert, out float2 Out)
{
Tile = fmod(Tile, Width * Height);
float2 tileCount = float2(1.0, 1.0) / float2(Width, Height);
float tileY = abs(Invert.y * Height - (floor(Tile * tileCount.x) + Invert.y * 1));
float tileX = abs(Invert.x * Width - ((Tile - Width * floor(Tile * tileCount.x)) + Invert.x * 1));
Out = (UV + float2(tileX, tileY)) * tileCount;
}
// https://forum.unity.com/threads/flipbook.1324218/
void Unity_Flipbook_float_FIXED(float2 UV, float Width, float Height, float Tile, float2 Invert, out float2 Out)
{
Tile = floor(fmod(Tile + float(0.00001), Width*Height));
float2 tileScale = float2(1.0, 1.0) / float2(Width, Height);
float x = floor((Tile + float(0.5)) * tileScale.x);
float tileX = (Tile - Width * x);
float tileY = (Invert.y * Height - (x + Invert.y * 1));
Out = (UV + float2(tileX, tileY)) * tileScale;
}
fixed4 frag (v2f i) : SV_Target
{
UNITY_SETUP_INSTANCE_ID(i);
float2 flipbook_uv = 0;
Unity_Flipbook_float_FIXED(i.uv.xy,
UNITY_ACCESS_INSTANCED_PROP(Props, _FlipX),
UNITY_ACCESS_INSTANCED_PROP(Props, _FlipY),
UNITY_ACCESS_INSTANCED_PROP(Props, _FlipIDX) - 1,
float2(-1, 1), flipbook_uv);
//return half4(flipbook_uv, 0, 1);
i.uv.xy = flipbook_uv;
// sample the texture
fixed4 col = tex2D(_MainTex, i.uv) * UNITY_ACCESS_INSTANCED_PROP(Props, _Color);
//#ifdef _IS_FOG_ON
// // apply fog
// fixed4 src_col = col;
// UNITY_APPLY_FOG(i.fogCoord, col);
// col = lerp(src_col, col, _FogIntensity);
//#endif
// apply fog
fixed4 src_col = col;
UNITY_APPLY_FOG(i.fogCoord, col);
col = lerp(src_col, col,
UNITY_ACCESS_INSTANCED_PROP(Props, _IS_FOG_ON) *
UNITY_ACCESS_INSTANCED_PROP(Props, _FogIntensity));
return lerp(col, saturate(col), UNITY_ACCESS_INSTANCED_PROP(Props, _ClampBrightness));
}
ENDCG
}
}
}