Virtual texture for unity.
- Open the project with Unity 2018(or later).
- Click "Menu -> Demo -> Generate Virtual Texture" to generate needed data, it may takes about 10 minutes.
- Open Demo Scene.
- Play. Use w/s/a/d and mouse to move the camera.
| Screenshot1 | Screenshot2 |
|---|---|
 |
 |
| component | output |
|---|---|
| Feedback Renderer |  |
| Feedback Reader |  |
| Tiled Texture |  |
| Page Table |  |
| Screenshot |  |
Render the scene with feedback shader:
fixed4 VTFragFeedback(VTV2f i) : SV_Target
{
float2 page = floor(i.uv * _VTFeedbackParam.x);
float2 uv = i.uv * _VTFeedbackParam.y;
float2 dx = ddx(uv);
float2 dy = ddy(uv);
int mip = clamp(int(0.5 * log2(max(dot(dx, dx), dot(dy, dy))) + 0.5 + _VTFeedbackParam.w), 0, _VTFeedbackParam.z);
return fixed4(page / 255.0, mip / 255.0, 1);
}Readback feedback texture from gpu to cpu.
Load all need texture tiles into TiledTexture.
update page table and lookup texture.
fixed4 VTFragUnlit(VTV2f i) : SV_Target
{
float2 uv = VTTransferUV(i.uv);
fixed4 col = VTTex2D0(uv);
return col;
}
float2 VTTransferUV(float2 uv)
{
float2 uvInt = uv - frac(uv * _VTPageParam.x) * _VTPageParam.y;
fixed4 page = tex2D(_VTLookupTex, uvInt) * 255;
float2 inPageOffset = frac(uv * exp2(_VTPageParam.z - page.b));
float2 inTileOffset = inPageOffset * _VTTileParam.y + _VTTileParam.x;
return (page.rg + inTileOffset) * _VTTileParam.zw;
}
fixed4 VTTex2D0(float2 uv)
{
return tex2D(_VTTiledTex0, uv);
}
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