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Correctly visualize texture tile resolution and pixel positions

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Erik Broberg
2016-06-30 13:25:22 -04:00
parent 8ac517e89c
commit d9d97b2dbd
4 changed files with 18 additions and 23 deletions
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modules/globebrowsing/shaders/tile.hglsl
+6 -12
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@@ -81,21 +81,15 @@ vec2 compensateSourceTextureSampling(vec2 startOffset, vec2 sizeDiff, const Tile
return tileUV;
}
vec2 compensateSourceTextureSampling2(vec2 startOffset, vec2 sizeDiff, const Tile tile, vec2 tileUV){
vec2 pixelSizeUV = 1 / (textureSize(tile.textureSampler, 0) + sizeDiff);
tileUV *= (1 - pixelSizeUV* 2);
tileUV += pixelSizeUV;
return tileUV;
vec2 TileUVToTextureSamplePosition(const Tile tile, vec2 tileUV){
vec2 uv = tile.uvTransform.uvOffset + tile.uvTransform.uvScale * tileUV;
uv = compensateSourceTextureSampling(vec2(0), vec2(0), tile, uv);
return uv;
}
vec4 getTexVal(const Tile tile, vec2 tileUV){
tileUV = tile.uvTransform.uvOffset + tile.uvTransform.uvScale * tileUV;
//tileUV = compensateSourceTextureSampling(vec2(-1), vec2(2), tile, tileUV);
//tileUV = compensateSourceTextureSampling2(vec2(-1), vec2(2), tile, tileUV);
vec4 texVal = texture(tile.textureSampler, tileUV);
vec2 samplePosition = TileUVToTextureSamplePosition(tile, tileUV);
vec4 texVal = texture(tile.textureSampler, samplePosition);
return texVal;
}