30 lines
1.2 KiB
GLSL
30 lines
1.2 KiB
GLSL
uniform vec3 u_boxLocalToShapeUvScale;
|
|
|
|
uniform ivec4 u_cameraTileCoordinates;
|
|
uniform vec3 u_cameraTileUv;
|
|
uniform mat3 u_boxEcToXyz;
|
|
|
|
mat3 convertLocalToShapeSpaceDerivative(in vec3 positionLocal) {
|
|
// For BOX, local space = shape space, so the Jacobian is the identity matrix.
|
|
return mat3(1.0);
|
|
}
|
|
|
|
vec3 scaleShapeUvToShapeSpace(in vec3 shapeUv) {
|
|
return shapeUv / u_boxLocalToShapeUvScale;
|
|
}
|
|
|
|
vec3 convertEcToDeltaTile(in vec3 positionEC) {
|
|
vec3 dPosition = u_boxEcToXyz * positionEC;
|
|
return u_boxLocalToShapeUvScale * dPosition * float(1 << u_cameraTileCoordinates.w);
|
|
}
|
|
|
|
TileAndUvCoordinate getTileAndUvCoordinate(in vec3 positionEC) {
|
|
vec3 deltaTileCoordinate = convertEcToDeltaTile(positionEC);
|
|
vec3 tileUvSum = u_cameraTileUv + deltaTileCoordinate;
|
|
ivec3 tileCoordinate = u_cameraTileCoordinates.xyz + ivec3(floor(tileUvSum));
|
|
tileCoordinate = min(max(ivec3(0), tileCoordinate), ivec3((1 << u_cameraTileCoordinates.w) - 1));
|
|
ivec3 tileCoordinateChange = tileCoordinate - u_cameraTileCoordinates.xyz;
|
|
vec3 tileUv = clamp(tileUvSum - vec3(tileCoordinateChange), 0.0, 1.0);
|
|
return TileAndUvCoordinate(ivec4(tileCoordinate, u_cameraTileCoordinates.w), tileUv);
|
|
}
|