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Shader "yum_food/GrassGridBlit"
{
Properties
{
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
// Grid parameters
float3 _PlayerGridPos; // Player's grid cell position (x, y, z)
int3 _GridCount; // Number of instances along each axis
int3 _GridHalf; // Half dimensions for centering around player
int2 _TexDimensions; // Texture width and height
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
}
float4 frag (v2f i) : SV_Target
{
// Convert UV to pixel coordinates
int2 pixelCoord = int2(i.uv.x * _TexDimensions.x, i.uv.y * _TexDimensions.y);
// Convert pixel coordinate to instance index
int instanceID = pixelCoord.x + pixelCoord.y * _TexDimensions.x;
// Calculate total valid instances
int totalInstances = _GridCount.x * _GridCount.y * _GridCount.z;
// If this pixel is beyond valid instances, output invalid marker
if (instanceID >= totalInstances) {
return float4(0, 0, 0, -1); // Alpha = -1 marks invalid
}
// Convert instance index to local grid coordinates (0 to GridCount-1)
int localX = instanceID % _GridCount.x;
int localY = (instanceID / _GridCount.x) % _GridCount.y;
int localZ = instanceID / (_GridCount.x * _GridCount.y);
// Convert to world grid coordinates centered around player
int worldX = _PlayerGridPos.x - _GridHalf.x + localX;
int worldY = _PlayerGridPos.y - _GridHalf.y + localY;
int worldZ = _PlayerGridPos.z - _GridHalf.z + localZ;
// Store world grid coordinates in RGB channels, alpha = 0 marks valid
return float4(worldX, worldY, worldZ, 0);
}
ENDCG
}
}
}
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